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Tin Atoms (tin + atom)

Distribution by Scientific Domains

Chemistry	86%
Polymers and Materials Science	6%
Physics and Astronomy	6%

Distribution within Chemistry

General & Introductory Chemistry	31%
Organic Chemistry	6%

Selected Abstracts

ChemInform Abstract: Matrix-Isolation Infrared Spectroscopic and Density Functional Theory Studies on Reactions of Laser-Ablated Lead and Tin Atoms with Water Molecules.

CHEMINFORM, Issue 3 2008
Yun-Lei Teng
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

Defect-impurity interactions in irradiated tin-doped Cz-Si crystals

PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 2 2003
L. I. Khirunenko
Abstract Results of a combined infrared absorption (IR) and deep-level transient spectroscopy (DLTS) study of defects induced by irradiation with fast electrons in Sn-doped Czochralski-grown Si crystals are reported. Tin atoms were found to interact effectively with vacancy as well as with interstitial-type radiation-induced defects. Manifestations of stable tin-vacancy and tin-interstitial carbon atom complexes were observed in DLTS and IR absorption spectra. Defect transformations upon heat-treatments of the irradiated samples were studied. Tin atoms were found to be effective traps for mobile vacancy,oxygen (V,O) complexes. A local vibrational mode of a Sn,V,O complex has been identified. [source]

Structural Diversity in Organotin Compounds Derived from Bulky Monoaryl Phosphates: Dimeric, Tetrameric, and Polymeric Tin Phosphate Complexes

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 9 2008
Ramaswamy Murugavel
Abstract Monoaryl phosphates with a bulky aryl substituent have been used to synthesize new organotin clusters and polymers. The equimolar reaction between 2,6-diisopropylphenylphosphate (dipp-H2) and Me2SnCl2 in ethanol at 25 °C leads to the formation of [Me2Sn(,3 -dipp)]n (1), while the reaction of 2,6-dimethylphenylphosphate (dmpp-H2) with Me2SnCl2 in either a 1:1 or 2:1 molar ratio proceeds to produce exclusively [Me2Sn(,-dmpp-H)2]n·nH2O (2). Compounds 1 and 2 are 1D polymers with different architectures. In compound 1, the tin atom is five-coordinate (trigonal bipyramidal). Each dipp ligand bridges three different tin atoms to form an infinite ladder-chain structure. In 2, each six-coordinate (octahedral) tin atom is surrounded by four phosphate oxygen atoms originating from four different bridging dmpp-H ligands, thus forming a spirocyclic coordination polymeric chain. The use of nBu2SnO as the diorganotin source in its reaction with dipp-H2 leads to the isolation of dimeric [nBu2Sn(,-dipp-H)(dipp-H)]2 (4), which contains a central Sn2O4P2 unit. There are two chemically different half molecules of 4 in the asymmetric part of the unit cell and hence it actually exists as a 1:1 mixture of [nBu2Sn(,-dipp-H)(dipp-H)]2 and [nBu2Sn(,-dipp)(dipp-H2)]2 in the solid state. The reaction of the monoorgano tin precursor nBuSn(O)(OH)·xH2O with dipp-H2 takes place in acetone at room temperature to yield the tetrameric cluster 5, which has different structures in the solution and in the solid state. 31P NMR spectroscopy clearly suggests that 5 has the formula [nBu4Sn4(,-O)2(,-dipp-H)8] in solution. The single-crystal X-ray diffraction studies in the solid state, however, reveal that compound 5 exists as [nBu4Sn4(,-OH)2(,-dipp-H)6(,-dipp)2]. The use of compounds 1,4 as possible precursors for the preparation of ceramic tin phosphate materials has been investigated. The thermolysis of 1 at 500 °C leads to the formation of quantitative amounts of Sn2P2O7, while the thermolysis of 2, 3, and 4 under similar conditions results in the formation of SnP2O7. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008) [source]

Synthesis and Structures of Bi(1,1-stannole)s

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 18 2005
Masaichi Saito
Abstract The synthesis and structures of bi(1,1-stannole)s are described. Treatment of 1-bromo-4-(dibromophenylstannyl)-1,3-butadiene with tert -butyllithium gives the bi(1,1-stannole) having a phenyl group on each tin atom, whereas treatment of 1-bromo-4-(tribromostannyl)-1,3-butadiene with phenyl- or bulky alkyllithiums gives the bi(1,1-stannole) having a phenyl or an alkyl group on each tin atom. The X-ray analysis of the tert -butyl-substituted bi(1,1-stannole) is also described. All bi(1,1-stannole)s display two shoulder absorption bands due to ,,,* and ,,,* transitions. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005) [source]

Synthesis and spectral studies of diorganotin heterocyclic dithiocarbamate complexes and crystal structures of (2- F -Bz)2Sn(Cl) S2CN(CH2CH2)2NEt and (3- Cl -Bz)2Sn [S2CN(CH2CH2)2NEt]2 , 0.5HN(CH2CH2)2NH

HETEROATOM CHEMISTRY, Issue 4 2005
Shengcai Xue
Some new diorganotin(IV) complexes of heterocyclic dithiocarbamate having general formula R2Sn(Cl)S2CNR'2 and R2Sn(S2CNR'2)2 [R = 2-F-Bz, 3-Cl-Bz; NR'2 = N(CH2CH2)2NMe, N(CH2CH2)2NEt, and N(CH2CH2)2NBz] have been prepared, respectively. Elemental analyses, IR, and NMR spectral data characterized all compounds. The crystal structures of (2-F-Bz)2Sn(Cl)S2CN(CH2CH2)2NEt 2 and (3-Cl-Bz)2Sn[S2CN(CH2CH2)2NEt]2 , 0.5 HN(CH2CH2)2NH 5 were determined by single crystal X-ray diffractometer. In the crystal of complex 2, the tin atom is rendered five-coordination in a trigonal bipyramidal configuration by coordinating with S atoms of dithiocarbamate groups. For complex 5, the central Sn atom exists in a skew-trapezoidal planar geometry defined by two asymmetrically coordinated dithiocarbamate ligands and two 3-chlorobenzyl groups. © 2005 Wiley Periodicals, Inc. 16:271,277, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.20096 [source]

Simultaneous determination of mono-, di- and tributyltin in environmental samples using isotope dilution gas chromatography mass spectrometry

JOURNAL OF MASS SPECTROMETRY (INCORP BIOLOGICAL MASS SPECTROMETRY), Issue 5 2004
Giuseppe Centineo
Abstract The development of a rapid, precise and accurate speciation method for the simultaneous determination of mono-, di- and tributyltin in environmental samples is described. The method is based on using isotope dilution gas chromatography/mass spectrometry (GC/MS) with electron ionization, a widely used technique in routine testing laboratories. A mixed spike containing 119Sn-enriched monobutyltin (MBT), dibutyltin (DBT) and tributyltin (TBT) was used for the isotope dilution of the samples. Five molecular ions were monitored for each analyte, corresponding to the 116Sn, 117Sn, 118Sn, 119Sn and 120Sn isotopes. The detection at masses corresponding to 116Sn and 117Sn were used to correct for m + 1 and m + 2 contributions of 13C from the organic groups attached to the tin atom on the 118Sn, 119Sn and 120Sn masses with simple mathematical equations and the concentrations of the butyltin compounds were calculated based on the corrected 118Sn/119Sn and 120Sn/119Sn isotope ratios. The 119Sn-enriched multispecies spike was applied with satisfactory results to the simultaneous determination of MBT, DBT and TBT in three certified reference materials: two sediments, PACS-2 and BCR 646, and the mussel tissue CRM 477. The method was compared with a previously published GC/inductively coupled plasma MS isotope dilution procedure, developed in our laboratory, by injecting the same samples into both instruments. Comparable analytical results in terms of precision and accuracy are demonstrated for both atomic and molecular mass spectrometric detectors. Thus, reliable quantitative organotin speciation analysis can be achieved using the more widespread and inexpensive GC/MS instrument. Copyright © 2004 John Wiley & Sons, Ltd. [source]

Effect of cyanoguanidine-metal and urea-metal complexes on the thermal degradation of poly(vinyl chloride)

JOURNAL OF VINYL & ADDITIVE TECHNOLOGY, Issue 1 2010
Abir S. Abdel-Naby
Tin, nickel, cobalt, zinc, and copper complexes of cyanoguanidine and urea were synthesized and investigated as thermal stabilizers for rigid poly(vinyl chloride) at 180°C in air. Their stabilizing efficiencies were evaluated by measuring the induction period (the period during which no evolved hydrogen chloride could be detected) and the rate of dehydrochlorination as determined by continuous potentiometric measurements, in addition to the extent of discoloration. The results clearly revealed the greater efficiency of all of the investigated metal complexes as compared to those of well-recognized reference stabilizers. The tin complex always exhibited the highest efficiency irrespective of the type of ligand used. The nickel and cobalt complexes also possessed high stabilizing efficiencies. The order of the stabilizing potency of the various metal complexes was Sn , Co, Ni , Zn, Cu. Combining the ligand itself with dimethyltin- s,s,-bis (isooctyl thioglycolate), as a reference stabilizer containing a tin atom, led to a true synergism. This synergistic effect might be attributed to the formation in situ of a complex between the ligand and the tin atom. J. VINYL ADDIT. TECHNOL., 2010. © 2010 Society of Plastics Engineers [source]

Synthesis, structure and biological activity of diorganotin derivatives with pyridyl functionalized bis(pyrazol-1-yl)methanes

APPLIED ORGANOMETALLIC CHEMISTRY, Issue 10 2010
Fang-Lin Li
Abstract Three pyridyl functionalized bis(pyrazol-1-yl)methanes, namely 2-[(4-pyridyl)methoxyphenyl] bis(pyrazol-1-yl)methane (L1), 2-[(4-pyridyl)methoxyphenyl]bis(3,5-dimethylpyrazol-1-yl)methane (L2) and 2-[(3-pyridyl)methoxyphenyl]bis(pyrazol-1-yl)methane (L3) have been synthesized by the reactions of (2-hydroxyphenyl)bis(pyrazol-1-yl)methanes with chloromethylpyridine. Treatment of these three ligands with R2SnCl2 (R = Et, n -Bu or Ph) yields a series of symmetric 2:1 adducts of (L)2SnR2Cl2 (L = L1, L2 or L3), which have been confirmed by elemental analysis and NMR spectroscopy. The crystal structures of (L2)2Sn(n -Bu)2Cl2·0.5C6H14 and (L3)2SnEt2Cl2 determined by X-ray crystallography show that the functionalized bis(pyrazol-1-yl)methane acts as a monodentate ligand through the pyridyl nitrogen atom, and the pyrazolyl nitrogen atoms do not coordinate to the tin atom. The cytotoxic activity of these complexes for Hela cells in vitro was tested. Copyright © 2010 John Wiley & Sons, Ltd. [source]

Aluminum(III) complexes containing O,O chelating ligand

APPLIED ORGANOMETALLIC CHEMISTRY, Issue 8 2007
Libor Dostál
Abstract The stoichiometric reactions of trimethylaluminum with 2,6-(MeOCH2)2C6H3OH (LH) revealed compounds L3Al (1) and L2AlMe (2). On the other hand reaction of 1 equiv. of LH with trimethylaluminum did not lead to the formation of complex LAlMe2 (3), rather 2 together with Me3Al were observed as a result of a disproportionation of 3. Compounds 1 and 2 were characterized by elemental analysis, 1H and 13C NMR spectroscopy and in the case of 1 by X-ray diffraction. Derivative 2 underwent transmetalation with Ph3SnOH, giving LSnPh3 (4) as the result of a migration of ligand L from the aluminum to the tin atom. The identity of 4 was established by elemental analysis, 1H, 13C and 119Sn NMR spectroscopy and 1H, 119Sn HMBC experiments. The system 2 and B(C6F5)3 in a 1:1 molar ratio was shown to be active in the polymerization of propylene oxide and ,-caprolactone. Copyright © 2007 John Wiley & Sons, Ltd. [source]

Crystallographic report: Bis(tetraphenylphosphonium) bis(dichloro-nitratophenylstannate)methane, [Ph4P+]2 [(PhCl2(NO3)Sn)2CH2]2,

APPLIED ORGANOMETALLIC CHEMISTRY, Issue 11 2003
Klaus Jurkschat
Abstract Each tin atom of the title compound is five-coordinate, defined by 2C, 2Cl and 1O atoms, and shows a distorted square pyramidal configuration stabilized by intramolecular Sn· · ·O or Sn· · ·Cl interactions. Both nitrate anions coordinate the tin atoms in a monodentate mode. Copyright © 2003 John Wiley & Sons, Ltd. [source]

Synthesis, properties and crystal structural characterization of diorganotin(IV) derivatives of 2-mercapto-6-nitrobenzothiazole

APPLIED ORGANOMETALLIC CHEMISTRY, Issue 8 2003
Chunlin Ma
Abstract The diorganotin(IV) dichlorides R2SnCl2 (R: Ph, PhCH2 or n -Bu) react with 2-mercapto-6-nitrobenzothiazole (MNBT) in benzene to give [Ph2SnCl(MNBT)] (1), [(PhCH2)2Sn(MNBT)2] (2) and [(n -Bu)2Sn(MNBT)2] (3). The three complexes have been characterized by elemental analysis and IR, 1H, 13C and 119Sn NMR spectroscopies. X-ray studies of the crystal structures of 1, 2 and 3 show the following. The tin environment for complex 1 is distorted cis-trigonal bipyramid with chlorine and nitrogen atoms in apical positions. The structure of complex 2 is a distorted octahedron with two benzyl groups in the axial sites. The geometry at the tin atom of complex 3 is that of an irregular octahedron. Interestingly, intra-molecular non-bonded Cl,S interactions and S,S interaction were recognized in the crystallographic structures of 1 and 3 respectively. As a result, complex 1 is a polymer and complex 3 is a dimer. Copyright © 2003 John Wiley & Sons, Ltd. [source]

Synthesis, Crystal Structure and in vitro Antitumor Activity of Di- n -butyltin p -[N, N -Bis(2-chloroethyl)amino]benzoates

CHINESE JOURNAL OF CHEMISTRY, Issue 12 2005
Zhong-Wei Zhang
Abstract Di- n -butyltin oxide reacted with p- [N,N -bis(2-chloroethyl)amino]benzoic acid to yield the compounds {{4-[(ClCH2CH2)2N]C6H4COOSnBu2}2O}2 (1) and {4-[(ClCH2CH2)2N]C6H4COO}2SnBu2 (2), which have been characterized by IR and 1H NMR spectra. The X-ray diffractional studies of 1 reveal the structure of the molecule to be a dimer, in which the two Bu2Sn groups were linked via two bridging oxygen atoms to form a central Bu4Sn2O2 unit. And the tin atom adopts two carbons from two n -butyl groups and three oxygen atoms from the acid and the bridging oxygen. In vitro test showed compound 1 to exhibit high cytotoxicity against P388 and HL-60 cell lines. [source]

Synthesis and characterization of diorganotin compounds {[R2Sn(ON=CHC6H5)]2O}2 and crystal structure of {[(CsH5CH2)2Sn(ON=CHC6H5)]2O}2

CHINESE JOURNAL OF CHEMISTRY, Issue 10 2004
Han-Dong Yin
Abstract Diorganotin compounds ([R2Sn(ON=CHC6H5)]2O)2 [R=C6H5CH2 (1), 2-FC6H4CH2 (2), 4-FC6H4CH2 (3), 2-ClC6H4CH2 (4), 4-ClC6H4CH2 (5)] were synthesized by the reaction of R2SnO with HON=CHC6H5 in 1:1 molar ratio in refluxing anhydrous benzene or toluene. They were characterized by elemental analysis, IR, 1H NMR and 119Sn NMR spectroscopy. And two sets of 119Sn chemical shifts were observed in the 119Sn NMR spectra of these compounds, indicating the presence of two types of environment around the tin atoms. The crystal structure of compound 1 was determined by X-ray single crystal diffraction analysis. The results showed that the crystal of compound 1 belongs to a monoclinic system with space group P21/c and unit cell dimensions: ,=1.0718(9) nm, b=1.9666(17) nm, c=2.0480(17) nm, ,=96.4371(14)°, Dc=1.450 g/cm3, Z=2, F(000)=1888, V=4.290(6) nm3, ,=1.206 mm,1, R1=0.0405, wR2=0.0786. The compound 1 belongs to centrosymmetric dimer structure mode with a four-membered central endo-cyclic Sn2O2 unit in which the bridging oxygen atoms are hi-coordinated. Each bridging oxygen atom also connects with an em-cyclic tin atom. The endo - and exo -cyclic tin atoms are both five-coordinated, and have coordination geometry of distorted trigonal bipyramid. [source]

One-dimensional Infinite Chain Organotin Compounds: Synthesis and Structural Characterization of Triphenyltin Thiazole-2-carboxylate and Triphenyltin 3-Pyridinylcarboxylate

CHINESE JOURNAL OF CHEMISTRY, Issue 10 2002
Han-Dong Yin
Abstract Triphenyltin thiazole-2-carboxylate (1) and triphenyltin 3-pyridinylcarboxylate (2) were synthesized by the reaction of sodium thiazole-2-carboxylate or sodium 3-pyridinylcarboxylate with the triphenyltin chloride and their crystal structures were determined by single crystal X-ray diffraction analysis. In the structure of 1, the tin atom is five-coordinated in a distorted trigonal bipyramidal structure. Due to the presence of a close intermolecular Sn,S interaction distance of 0.3666 nm, the structure can be described as a weakly-bridged one-dimensional chain compound. In the structure of 2, the tin atom is five-coordinated with bridging 3-pyridinylcarboxylate ligands N atom and resulting structure is one-dimensional chain compound. [source]

1-D-Tin(II) Phenylchalcogenolato Complexes ,1[Sn(EPh)2] (E = S, Se, Te) , Synthesis, Structures, Quantum Chemical Studies and Thermal Behaviour

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 3 2010
Andreas Eichhöfer
Abstract A series of three 1-D-tin(II) phenylchalcogenolato complexes ,1[Sn(EPh)2] (E = S, Se, Te) were synthesized in yields > 80,% by reaction of SnCl2 with two equivalents of PhESiMe3 in organic solvents. In the crystal the molecules form two different types of one-dimensional chains. In ,1[Sn(SPh)2] the tin atoms are distorted trigonal pyramidal coordinated by sulfur atoms (two bonds within a monomer and one longer bond between neighbored monomers), while in ,1[Sn(EPh)2] (E = Se, Te) the tin atoms show contacts to two neighbored monomers leading to a fourfold coordination of the tin atoms by either selenium or tellurium atoms. The bond situation is discussed on the basis of density functional calculations. Thermal treatment mostly leads to the formation of the corresponding phase pure tin(II) chalcogenides however sublimation plays an increasing role ongoing from the tellurolato to the thiolato complex especially for the use of vacuum conditions. The investigation of the volatile cleavage products reveals the occurence of more complex reactions in the gas phase than the formal stoichiometric cleavage of EPh2 (E = S, Se, Te) with formation of SnE. [source]

Structural Diversity in Organotin Compounds Derived from Bulky Monoaryl Phosphates: Dimeric, Tetrameric, and Polymeric Tin Phosphate Complexes

Polystannanes: Polymers of a Molecular, Jacketed Metal,Wire Structure,

ADVANCED MATERIALS, Issue 11 2008
Fabien Choffat
Abstract Organometallic polymers comprising a backbone of covalently connected metal atoms can be regarded as molecular metal wires surrounded by a jacket of organic matter. Such polymers are rare and their materials properties are largely unexplored. Here, we report on polystannanes, (SnR2)n, that is, polymers with a backbone of tin atoms, which are synthesized by dehydropolymerization of dialkylstannanes (H2SnR2) with the catalyst [RhCl(PPh3)3]. The polystannanes feature reversible phase transitions into liquid-crystalline states, remarkably, even below room temperature, and, interestingly, oriented either parallel or perpendicular to external driving forces, depending on the length of the alkyl substituents. [source]

Electronic structure of the uranium monostannide USn

PHYSICA STATUS SOLIDI (B) BASIC SOLID STATE PHYSICS, Issue 2 2003
A. Szajek
Abstract The uranium monostannide USn crystallizes in the orthorhombic ThIn-type structure (Pbcm space group) in which the uranium and tin atoms each occupy three crystallographic positions. The electronic structure of USn compound has been studied using spin-polarized tight binding version of the linear muffin-tin orbital method in the atomic sphere approximation (TB LMTO ASA). The calculations showed that all three types of uranium atoms are magnetically ordered and their moments depend on local environments. [source]

Synthesis, structure and biological activity of triorganotin 1H -tetrazolyl-1-acetates: cyclic hexamer and linkage coordination polymers

APPLIED ORGANOMETALLIC CHEMISTRY, Issue 1 2010
Yun-Fu Xie
Abstract Reaction of 1H -tetrazolyl-1-acetic acid (CHN4CH2CO2H) with (R3Sn)2O or R3SnOH yields triorganotin 1H -tetrazolyl-1-acetates [CHN4CH2CO2SnR3, R = Ph (1), p -tolyl (2), cyclohexyl (3), n -Bu (4) and Et (5)]. 1H -tetrazolyl-1-acetates in these triorganotin derivatives display remarkably different coordination modes, depending on the properties of the organic substituents bonded to the tin atoms. Complex 1 displays a rare cyclohexameric structure by the assembly of the SnN coordination bond, while complex 2 forms a linkage coordination polymer through the intermolecular Sn···N interactions. The structure of complex 3 is similar to that of complex 2, but the intermolecular Sn···N interactions are weaker in the former. However, in complex 4, the tetrazolyl nitrogen atoms do not coordinate to the tin atoms. This complex forms a polymeric chain by the unsymmetric bridging carboxylate group. All these complexes exhibit good antifungal activities in vitro against Alternaria solani, Cercospora arachidicola, Gibberella zeae, Physalospora piricola and Botrytis cinerea. The corresponding EC50 values of these complexes were tested. Copyright © 2009 John Wiley & Sons, Ltd. [source]

Hydrolysis of C,N -chelated diorganotin(IV) chlorides and catalysis of transesterification reactions

APPLIED ORGANOMETALLIC CHEMISTRY, Issue 7 2009
ka Pad, lková
Abstract Diorganotin(IV) dichlorides of formula LCNRSnCl2 (where R is nBu or Ph) containing one LCN chelating ligand were hydrolyzed with aqueous sodium hydroxide in benzene. The composition of the products is strongly dependent on the amount of hydroxide. The partially hydrolyzed compounds of composition (LCNRSnCl)2(µ-O) were isolated as crystalline products. A hydrolysis where more than one molar equivalent of NaOH is employed gave only a mixture of unidentifiable products. The structure of (LCNPhSnCl)2(µ-O) was determined by X-ray diffraction techniques in the solid state. In solution there was a mixture of diastereoisomers found, where the tin atoms serve as a stereogenic centers. The catalytic activity of starting dichlorides as well as (LCNPhSnCl)2(µ-O) in various transesterification processes was investigated. The activity is very low in the case of starting dichlorides. When two molar equivalents of NaH are added or (LCNPhSnCl)2(µ-O) is employed in the catalytic experiments, the activity is comparable to the literature data. Copyright © 2009 John Wiley & Sons, Ltd. [source]

Synthesis, structural characterization and cytotoxic activity of diorganotin(IV) complexes of N -(5-halosalicylidene)tryptophane

APPLIED ORGANOMETALLIC CHEMISTRY, Issue 1 2009
Laijin Tian
Abstract Four new diorganotin(IV) complexes of N -(5-halosalicylidene)tryptophane, R2Sn[5-X-2-OC6H3CHNCH(CH2Ind)COO] [Ind = 3-indolyl; R, X = Et, Cl (1); Et, Br(2); n -Bu, Cl (3); n -Bu, Br (4)], were synthesized and characterized by elemental analysis, IR and NMR (1H, 13C and 119Sn) spectra. The crystal structures of complexes 1,3 were determined by X-ray single crystal diffraction and showed that the tin atoms are in a distorted trigonal bipyramidal geometry and form five- and six-membered chelate rings with the tridentate ligand. Intermolecular weak interactions in 1,3 link molecules, respectively, into a two-dimensional array, a one-dimensional infinite chain and a one-dimensional double-chain supramolecular structure. Bioassay results of the compounds indicated that the dibutyltin complexes 3 and 4 have potent in vitro cytotoxic activity against two human tumor cell lines, CoLo205 and Bcap37, while the diethyltin complexes 1 and 2 display weak cytotoxic activity. Copyright © 2008 John Wiley & Sons, Ltd. [source]

Synthesis, characterization and biological activity of diphenyltin(IV) complexes of N -(3,5-dibromosalicylidene)-,-amino acid and their diphenyltin dichloride adducts

APPLIED ORGANOMETALLIC CHEMISTRY, Issue 1 2006
Laijin Tian
Abstract Diphenyltin(IV) complexes of N -(3,5-dibromosalicylidene)-,-amino acid, Ph2Sn[3,5-Br2 -2-OC6H2 CHNCH(R)COO] (where R = H, Me, i -Pr, Bz), and their 1:1 adducts with diphenyltin dichloride, Ph2Sn[3,5-Br2 -2-OC6H2CHNCH(R)COO]·Ph2SnCl2, have been synthesized and characterized by elemental analysis, IR and NMR (1H, 13C and 119Sn) spectra. The crystal structure of Ph2Sn[3,5-Br2 -2-OC6H2CHNCH(i -Pr)COO] shows a distorted trigonal bipyramidal geometry with the axial locations occupied by a carboxylate,oxygen and a phenolic,oxygen atom of the ligand, and that of Ph2Sn[3,5-Br2 -2-OC6H2CHNCH(i -Pr)COO]·Ph2SnCl2 reveals that the two tin atoms are joined via the carbonyl atom of the ligand to form a mixed organotin binuclear complex. Bioassay indicates that the compounds possess better cytotoxic activity against three human tumor cell lines (HeLa, CoLo205 and MCF-7) than cis -platin and moderate antibacterial activity against two bacteria (E. coli and S. aureus). Copyright © 2005 John Wiley & Sons, Ltd. [source]

Crystallographic report: Bis(tetraphenylphosphonium) bis(dichloro-nitratophenylstannate)methane, [Ph4P+]2 [(PhCl2(NO3)Sn)2CH2]2,

Computational study of dimethyl- and trimethyl-tin(IV) complexes of porphyrin derivatives

APPLIED ORGANOMETALLIC CHEMISTRY, Issue 7 2001
Dario Duca
Abstract The molecular geometry, energetics and electronic charge distribution of diorgano- and triorgano-tin(IV) complexes of [protoporphyrin-IX] and [meso -tetra(4-carboxyphenyl)porphine] derivatives were determined at semi-empirical and ab initio levels. To study the molecular details of the complexes, simpler molecule models were calculated by the ab initio pseudo-potential method. The molecular properties of these complexes are essentially independent of the presence of the peripheral tin atoms. Agreement was always found among the results of the different computational approaches, as well as between the theoretical and the experimental findings on the molecular geometry of the hypothesized complexes. Interaction modes between water and the organo-tin systems considered were affected strongly by the presence of peripheral tin atoms. Copyright © 2001 John Wiley & Sons, Ltd. [source]

Solubilizing Sodium Fluoride in Acetonitrile: Synthesis, Molecular Structure, and Complexation Behavior of Bis(organostannyl)methyl-Substituted Crown Ethers,

CHEMISTRY - A EUROPEAN JOURNAL, Issue 36 2007
Gregor Reeske Dr.
Abstract The synthesis of the crown-ether-substituted bis(organostannyl)methanes Ph3SnCH2Sn(Ph2)-CH2 -[16]crown-5 (1) and Ph2ISnCH2Sn(I)(Ph)-CH2 -[16]crown-5 (2) is reported. Both compounds have been characterized by elemental analyses, 1H, 13C, 19F, and 119Sn,NMR spectroscopy, and in the case of compound 2 also by electrospray ionization mass spectrometry. Single-crystal X-ray diffraction analysis revealed for the aqua complex 2,H2O trigonal,bipyramidal-configured tin atoms with intramolecular Sn(1)O(1) and Sn(2)O(1W) distances of 2.555(2) and 2.440(3),Å, respectively. The water molecule is trapped in a sandwich-like fashion between the crown ether oxygen atoms O(2) and O(4) and the Sn(2) atom. NMR spectroscopy unambiguously proved the ability of compound 2 in acetonitrile to overcome the high lattice energy of sodium fluoride and to complex the latter under charge separation. [source]

The Tautomeric Forms of Cyameluric Acid Derivatives,

CHEMISTRY - A EUROPEAN JOURNAL, Issue 4 2007
Nadia
Abstract The tautomerism of cyameluric acid C6N7O3H3 (1,a), cyamelurates and other heptazine derivatives has recently been studied by several theoretical investigations. In this experimental study we prepared stannyl and silyl derivatives of cyameluric acid (1,a): C6N7O3[Sn(C4H9)3]3 (3,a), C6N7O3[Sn(C2H5)3]3 (3,b), and C6N7O3[Si(CH3)3]3 (4). In order to investigate the structure of 1,a the mono- and dipotassium cyamelurate hydrates K(C6N7O3H2),2,H2O (5) and K2(C6N7O3H),1,H2O (6) were synthesized by UV/Vis-controlled titration of a potassium cyamelurate solution with aqueous hydrochloric acid. Compounds 3,6 were characterized by FTIR and solid-state NMR spectroscopy as well as simultaneous thermal analysis (TGA, DTA). The single crystal X-ray structures of the salts 5 and 6 show that the hydrogen atoms in both anions are localized on the peripheral nitrogen atoms. This indicates,in combination with the solid-state NMR studies,that the most stable tautomer of solid 1,a is the triketo form with C3h symmetry. However, derivatives of both the hydroxyl and the amido tautomers may be formed depending on the substituent atoms: The spectroscopic data and single crystal structures of compounds C6N7O3[Si(CH3)3]3 (4) and the solvate C6N7O3[Sn(C2H5)3]3,C2H4Cl2 (3,b,) show that the former is derived from the symmetric trihydroxy form of 1,a, while 3,b, crystallizes as a chain-like polymer, which contains the tin atoms as multifunctional building blocks, that is, bridging pentacoordinated Et3SnO2 and Et3SnON units as well as non-bridging four-coordinated Et3SnN units. The cyameluric nucleus is part of the polymeric chains of C6N7O3[Sn(C2H5)3]3,C2H4Cl2 (3,b,), by the action of both tautomeric forms of cyameluric acid, the amide and the ester form. [source]

Synthesis and characterization of diorganotin compounds {[R2Sn(ON=CHC6H5)]2O}2 and crystal structure of {[(CsH5CH2)2Sn(ON=CHC6H5)]2O}2

Synthesis, Properties and Crystal Structure of Seven-coordinated Organotin Complex [nBu2Sn(OOCC5H4N-2)2(H2O)]

CHINESE JOURNAL OF CHEMISTRY, Issue 12 2002
Han-Dong Yin
Abstract A novel seven-coordinated organotin complex [nBu2Sn-(OOCC5H4N-2)2(H2O)] was unexpectedly synthesized by reaction of nBu3SnCl with 2-pyridinecarboxylic acid in 1:1 molar ratio in the presence of organic base Et3N. The crystal structure was determined by single crystal X-ray diffraction analysis. The crystal belongs to rhombohedral with space group R-3c, a = 1.5807(3) nm, b = 1.5807(3) nm, c = 1.5807(3) nm, , = 105.717(2)°, , = 105.717(2)°, , = 105.717(2)°, Z = 6, V = 3.397(8) nm3, Dc = 1.452 g/cm3, , = 1.158 mm,1, F(000) = 1512, R1 = 0.0447, wR2 = 0.1038. In crystal, the tin atoms rendered seven-coordinate in a distorted pentagonal bipyramidal geometry. The two-dimensional network structure was formed by H-bonding interaction between the free oxygen atoms of carboxyl groups and the coordinated water molecules. [source]