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Pyridine Ligands (pyridine + ligand)

Distribution by Scientific Domains
Chemistry88%
Polymers and Materials Science12%
Distribution within Chemistry
Organic Chemistry22%
General & Introductory Chemistry13%

Selected Abstracts

Bis(terdentate) Pyrazole/Pyridine Ligands: Synthesis, Crystal Structures and Magnetic Properties of Bridged Binuclear and Tetranuclear Copper(II) Complexes

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 23 2009
Akhilesh Kumar Singh
Abstract A new binucleating bis(terdentate) ligand, 3,5-[3-bis(2-pyridyl)pyrazole-1-ylmethyl]pyrazole (HL2), was synthesized. Reaction of the deprotonated ligand L2 with hydrated CuII salts gives (,-pyrazolato)(,-hydroxido)-bridged binuclear and tetranuclear complexes [L2Cu2(,-OH)(ClO4)(MeCN)](ClO4) (2), [L2Cu2(dmf)2(,3 -OH)]2(ClO4)4·4dmf (3·4dmf) and [L2L,Cu2](ClO4)2 [4; HL, = 3-(2-pyridyl)pyrazole]. In these complexes, both ,-OH and ,3 -OH bridges were observed. This contrasts the situation for a dicopper(II) complex of the related bis(terdentate) ligand 3,5-bis[6(2,2,-dipyridyl)]pyrazole (HL1), {L1Cu2(OMe)(MeOH)[,1 - O -(NO3)]}{[Cu2(NO3)2(,-OMe)2]}0.5·MeOH (1·MeOH), where the shorter and more rigid ligand side arms enforce a larger Cu···Cu separation and the formation of a MeO,HOMe moiety within the bimetallic pocket. Molecular structures of all complexes were elucidated by X-ray crystallography. Variable-temperature magnetic susceptibility measurements (295,2 K) for powdered samples of complexes 2,4 reveal strong antiferromagnetic coupling between two copper centres. The magnitude of the coupling is discussed in view of the structural features. During the preparation of complex 4, partial ligand hydrolysis was also observed, but this strongly depends on the reaction conditions.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009) [source]

Highly Enantioselective 1,4-Conjugate Addition of Diethylzinc to Acyclic Enones with Chiral Phosphite,Pyridine Ligands Derived from H8 -NOBIN.

CHEMINFORM, Issue 16 2004
Yuanchun Hu
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

Palladium-Catalyzed Asymmetric Tandem Allylic Substitution Using Chiral (2-Phosphinophenyl)pyridine Ligand.

CHEMINFORM, Issue 3 2005
Katsuji Ito
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

Oxido Pincer Ligands , Exploring the Coordination Chemistry of Bis(hydroxymethyl)pyridine Ligands for the Late Transition Metals

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 15 2009
Axel Klein
Abstract Coordination of the 2,6-bis(hydroxymethyl)pyridine-based oxido pincer ligands RR,pydimH2 [R = R, = H (pydimH2); R = R, = Me (pydipH2); R = 2-tolyl, R, = Me (pydotH2)] towards late transition metals CoII, NiII, CuII, ZnII, PdII and PtII allows the formation of molecular species (complexes), which exhibit three main structural motifs in the solid state. The two main species are pentacoordinate [(RR,pydimH2)MCl2] and hexacoordinate [(RR,pydimH2)2M]X2, both of which are stable in solution and can be interconverted by changing the solvent polarity. The disproportionation equilibrium [(RR,pydimH2)MCl2] [rlhar2] [(RR,pydimH2)2M]2+ + [MCl4]2, was studied by optical spectroscopy. The chiral ligand pydotH2 allows the formation of chiral complexes. In the square-planar complexes [(pydimH2)2MCl2] (M = PdII or PtII) the oxido donor functions of the ligands do not take part in the coordination.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009) [source]

Spectroscopic and Computational Study on New Blue Emitting ReL(CO)3Cl Complexes Containing Pyridylimidazo[1,5- a]pyridine Ligands

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 23 2008
Claudio Garino
Abstract The structural and photophysical properties of three new ReL(CO)3Cl complexes (ReL1,ReL3) and their 1-(2-pyridyl)imidazo[1,5- a]pyridine ligands, namely 3-methyl-1-(2-pyridyl)imidazo[1,5- a]pyridine (L1), 1-(2-pyridyl)-3-[4-(trifluoromethyl)phenyl]imidazo[1,5- a]pyridine (L2), and 3-(4-nitrophenyl)-1-(2-pyridyl)imidazo[1,5- a]pyridine (L3), were studied by spectroscopy, X-ray diffraction, and computational methods. ReL1,ReL3 have high-energy singlet emissions arising from a , , ,* ligand-centered state. In oxygen-free acetonitrile solutions, the complexes display dual fluorescence due to intense ligand-centered triplet emission.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008) [source]

ChemInform Abstract: Chiral Bis(trialkylsiloxymethyloxazolinyl)pyridine Ligands.

CHEMINFORM, Issue 26 2002
3-Dipolar Cycloaddition Reactions., Highly Enantioselective
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 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]

Tris-Cyclometalated Iridium(III) Complexes of Carbazole(fluorenyl)pyridine Ligands: Synthesis, Redox and Photophysical Properties, and Electrophosphorescent Light-Emitting Diodes

CHEMISTRY - A EUROPEAN JOURNAL, Issue 5 2007
Sylvia Bettington Dr.
Abstract Using ligands synthesized by Suzuki cross-coupling methodology, new phosphorescent homoleptic tris-cyclometalated complexes have been obtained, namely fac -[Ir(Cz-2-FlnPy)3] (1,d,f) and fac -[Ir(Cz-3-FlnPy)3] (2,d,f), which are solution-processible triplet emitters (Cz denotes N -hexylcarbazole, n is the number of 9,9,-dihexylfluorene (Fl) units (n=0,1,2) and Py is pyridine). In all cases, Py and Fl are substituted at the 2- and 2,7-positions, respectively, and Cz moieties are substituted by either Py or Fl at the 2- or 3-positions, in series 1 and 2, respectively. The oxidation potential of 1,d studied by cyclic voltammetry (=0.14,V, versus Ag/AgNO3, CH2Cl2) is less positive (i.e. raised HOMO level) compared to that of the isomer 2,d (=0.30,V), where the Cz-nitrogen is meta to the Ir center. Ligand-centered oxidations occur at more positive potentials, leading to 7+ oxidation states with good chemical reversibility and electrochemical quasi-reversibility, for example, for 2,f =0.45 (1e), 0.95 (3e), 1.24,V (3e). Striking differences are seen in the solution-state photophysical data between complexes [Ir(Cz-2-Py)3] (1,d) and [Ir(Cz-3-Py)3] (2,d), in which the Cz moiety is bonded directly to the metal center: for the latter there is an 85,nm blue-shift in emission, a decrease in the luminescence lifetime and an increase in the PLQY value. Organic light emitting devices were made by spin-coating using polyspirobifluorene:bis(triphenyl)diamine (PSBF:TAD) copolymer as host and the complexes 1,d or 2,d as dopants. Turn-on voltages are low (3,4,V). With 1,d orange light is emitted at ,max=590,nm with an EQE of 1.3,% (at 7.5,mA,cm,2) and an emission intensity (luminance) of 4354,cd,m,2 (at 267,mA,m,2). The green emission from 2,d devices (,max=500,nm) is due to the reduced electron-donating ability of the carbazole unit in 2,d. Recording the EL spectra of the 1,d device at 6,V (current density, 100,mA,cm,2) established that the time to half brightness was about 9,h under continuous operation with no change in the spectral profile, confirming the high chemical stability of the complex. [source]

Fluoride-Free Hiyama and Copper- and Amine-Free Sonogashira Coupling in Air in a Mixed Aqueous Medium by a Series of PEPPSI-Themed Precatalysts,

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 12 2009
Chandrakanta Dash
Abstract A new series of robust, user-friendly, and highly active PEPPSI-themed (pyridine-enhanced precatalyst preparation, stabilization and initiation) (NHC)PdX2(pyridine)-type (X = Cl, Br) precatalysts of C4,C5 saturated imidazole- (1,4) and triazole-based (5 and 6) N-heterocyclic carbenes for the Hiyama and Sonogashira couplings under amenable conditions are reported. Specifically 1,6 efficiently catalyze the fluoride-free Hiyama coupling of aryl halides with PhSi(OMe)3 and CH2=CHSi(OMe)3 in air in the presence of NaOH as a base in a mixed aqueous medium (dioxane/H2O, 2:1 v/v). Along the same lines, these 1,6 precatalysts also promote the Cu-free and amine-free Sonogashira coupling of aryl bromides and iodides with phenylacetylene in air and in a mixed aqueous medium (DMF/H2O, 3/1 v/v). The complexes 1,6 were synthesized by the direct reaction of the respective imidazolinium and triazolium halide salts with PdCl2 in pyridine in the presence of K2CO3 as a base. DFT studies on the catalytically relevant palladium(0) (NHC)Pd(pyridine) precursors 1a,6a reveal significant donation from the N-heterocyclic carbene lone pair onto the unfilled ,* orbital of the trans Pd,pyridine bond. This weakens the Pd-bound "throwaway" pyridine ligand, and its dissociation marks the initiation of the catalytic cycle.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009) [source]

Benzylideneruthenium Complexes Bearing Pyridine-Based Ligands and Their Influence on the Formation of Mono- or Bis(pyridine) Complexes

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 34 2007
Wen-Zhen Zhang
Abstract Benzylideneruthenium complexes bearing the N-heterocyclic carbene (NHC) ligand 1,3-bis(2,6-dimethylphenyl)-4,5-dihydroimidazol-2-ylidene (H2IMe) and one or two pyridine-based ligands have been prepared by treating [RuCl2(=CHPh)(H2IMe)(PPh3)] with the corresponding pyridine derivative. X-ray crystallographic and mass spectrometric evidence is used to investigate the interconversion between mono- and bis(pyridine) complexes and the influence of the pyridine ligand on the formation of these complexes. The catalytic activity of these complexes has been tested in the ring-closing metathesis (RCM) reaction of diallylmalononitrile and the cross metathesis (CM) reaction of acrylonitrile with terminal olefins.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007) [source]

Ligand-Controlled Cross-Dimerization and -Trimerization of Alkynes under Nickel Catalysis

ADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 14-15 2008
Naoto Matsuyama
Abstract The cross-dimerization of diphenylacetylene with trimethylsilylacetylene via CH bond cleavage in the presence of a catalytic amount of bis(cyclooctadiene)nickel [Ni(cod)2] together with a pyridine-based ligand efficiently proceeds to give the corresponding enyne compound with good yield. In contrast, their 1:2 cross-trimerization leading to a dienyne derivative takes place selectively using a triarylphosphine ligand. The regioselective cross-dimerization of some unsymmetrical internal arylalkynes with terminal silylacetylenes is also accomplished using the pyridine ligand. [source]

Bis[4-(dimethylamino)pyridine-,N1]silver(I) nitrate dihydrate

ACTA CRYSTALLOGRAPHICA SECTION C, Issue 9 2009
Al-shima'a A. Massoud
The title compound, [Ag(C7H10N2)2]NO3·2H2O or [Ag(dmap)2]NO3·2H2O, where dmap is 4-(dimethylamino)pyridine, has a distorted linear coordination geometry around the AgI ion. A novel pattern of water,nitrate hydrogen-bonded anionic strands is formed in the c direction, with the cationic [Ag(dmap)2]+ monomers trapped between them. The AgI ion and the nitrate group atoms, as well as the water molecules (including the H atoms), are on a crystallographic mirror plane (Wyckoff position 4a). The influence of bulky methyl substituents in position 4 of the 4-(dimethylamino)pyridine ligand on packing is discussed. The absolute structure was determined unequivocally. [source]

Paddlewheel dirhodium complexes bridged by para -substituted benzoates

ACTA CRYSTALLOGRAPHICA SECTION C, Issue 9 2006
Kaori Yamada
The dirhodium complex bis­(benzonitrile)tetra­kis[,-4-(diethyl­amino)benzoato-,2O:O,]dirhodium(II)(Rh,Rh) benzonitrile disolvate, [Rh2(C11H14NO2)4(C7H5N)2]·2C7H5N, lies about an inversion centre. The dirhodium complex (methanol)tetra­kis(,-4-nitro­benzoato-,2O:O,)(pyridine)dirhodium(II)(Rh,Rh) dichloro­methane solvate, [Rh2(C7H4NO4)4(C5H5N)(CH4O)]·CH2Cl2, lies in a general position in the unit cell, but the complexes dimerize around an inversion centre via O,H,O hydrogen bonding of the axial MeOH to a carboxyl­ate O atom. In the latter crystal structure, ,,, stacking inter­actions between the bridging 4-nitro­benzoate ligands and the axial pyridine ligand are observed between adjacent mol­ecules. [source]

Polyhedral aza­borane chemistry, 6-(C5H5N)- arachno -4-NB8H11

ACTA CRYSTALLOGRAPHICA SECTION C, Issue 5 2000
Caroline Price
The title compound, 6-pyridyl-4-aza- arachno -nonaborane(11), C5H16B8N2, has an arachno nine-vertex {4-NB8H11} cluster structure with a pyridine ligand in the exo -6-position. The cluster has close geometric similarities to the thia­borane and carbaborane analogues. [source]

ChemInform Abstract: Chiral Bis(imidazolidine)pyridine,Cu(OTf)2: Catalytic Asymmetric Endo-Selective [3 + 2] Cycloaddition of Imino Esters with Nitroalkenes.

CHEMINFORM, Issue 34 2010
Takayoshi Arai
Abstract A new bis(imidazolidine)pyridine ligand is easily synthesized in a single condensation of 2,6-pyridyl bisaldehyde and optically active diphenylethylenediamine. [source]

Crystal Structure and Ethylene Oligomerization Catalytic Activity of {2-Carbethoxy-6-[1-[(2,6-diethyl-phenyl)imino]ethyl]pyridine}CoCl2

CHINESE JOURNAL OF CHEMISTRY, Issue 1 2007
Bi-Yun Sun
Abstract The unsymmetric precursor ethyl 6-acetylpyridine-2-carboxylate (4) was synthesized from 2,6-dimethylpyridine (1). On the basis of this precursor, a new mono(imino)pyridine ligand (5) and the corresponding Co(II) complex {2-carbethoxy-6-[1-[(2,6-diethylphenyl)imino]ethyl]pyridine}CoCl2 (6) were prepared. The crystal structure of complex indicates that the 2-carbethoxy-6-iminopyridine is coordinated to the cobalt as a tridentate ligand using [N, N, O] atoms, and the coordination geometry of the central cobalt is a distorted trigonal bipyramid, with the pyridyl nitrogen atom and the two chlorine atoms forming the equatorial plane. Being applied to the ethylene oligomerization, this cobalt complex shows catalytic activity of 1.820×104 g/mol-Co·h at 101325 Pa of ethylene at 15.5 °C for 1 h, when 1000 equiv. of methylaluminoxane (MAO) is employed as the cocatalyst. [source]

Spectroscopic and Computational Study on New Blue Emitting ReL(CO)3Cl Complexes Containing Pyridylimidazo[1,5- a]pyridine Ligands

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 23 2008
Claudio Garino
Abstract The structural and photophysical properties of three new ReL(CO)3Cl complexes (ReL1,ReL3) and their 1-(2-pyridyl)imidazo[1,5- a]pyridine ligands, namely 3-methyl-1-(2-pyridyl)imidazo[1,5- a]pyridine (L1), 1-(2-pyridyl)-3-[4-(trifluoromethyl)phenyl]imidazo[1,5- a]pyridine (L2), and 3-(4-nitrophenyl)-1-(2-pyridyl)imidazo[1,5- a]pyridine (L3), were studied by spectroscopy, X-ray diffraction, and computational methods. ReL1,ReL3 have high-energy singlet emissions arising from a , , ,* ligand-centered state. In oxygen-free acetonitrile solutions, the complexes display dual fluorescence due to intense ligand-centered triplet emission.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008) [source]

Synthesis and Structural Characterisation of Copper(II) 15-Metallacrown-5 Complexes with PbII, HgII, AgI, NaI and YIII Central Metal Ions

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 19 2007
Sabry Hamed Seda
Abstract The new copper(II) 15-metallacrown-5 complexes with the central metal ions PbII, HgII, AgI, NaI and YIII, with the formula [MCu5L5]Xn {H2L is 2-picolinehydroxamic acid or (S)-phenylalaninehydroxamic acid and X, is NO3, or Cl,}, have been synthesised and characterised by NMR and UV/Vis spectroscopy, electrospray mass spectrometry and elemental analysis. The PbII - and HgII 15-metallacrown-5 complexes were obtained in the crystalline form as pyridine adducts [PbCu5(picha)5(py)6](NO3)2·3(py) and [HgCu5(picha)5(py)7](NO3)2·2(py) and their X-ray crystal structures were determined. In both complexes, each peripheral CuII ion of the metallacrown is coordinated by one pyridine molecule bonded in the axial position. In the case of the PbII derivative, one additional axial pyridine molecule is bound to the central metal ion, while in the case of the HgII derivative, two axial pyridine ligands are bound to the central HgII ion. The relative stability of the copper(II) 15-metallacrown-5 complexes with various central metal ions was determined on the basis of competition reactions. The relative preference of the 15-metallacrown-5 system for the central metal ion follows the series NaI, AgI < lanthanide(III), HgII < PbII.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007) [source]

Pyridine Carboxylate Complexes of MoII as Active Catalysts in Homogeneous and Heterogeneous Polymerization

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 18 2007
Maria Vasconcellos-Dias
Abstract New lamellar materials intercalated with molybdenum(II) complexes with potential catalytic properties were prepared by a stepwise procedure. The lamellar material was first calcined at 823 K for four hours to eliminate all the carbonate ions; the layered structure was reconstructed after treatment with a solution of either pycH (pyridine-2-carboxylic acid) or pydcH2 (pyridine-2,6-dicarboxylic acid) in a KOH solution of dmf at 343 K. Impregnation with a solution of the organometallic precursor [Mo(CO)3I2(NCCH3)2] led to substitution of the nitrile groups by two pyridine ligands. All the materials were characterized by powder X-ray diffraction, FTIR, and 13C CP MAS and 27Al MAS solid-state NMR spectroscopy. Similar MoII complexes were also prepared by using pycH or pydcH2 and characterized by elemental analysis as well as FTIR and 1H and 13C solution NMR spectroscopy. These new materials and the complexes of pyc or pydc ligands containing 4.54 wt.-% and 6.33 wt.-% of Mo respectively, catalyze the ring-opening-metathesis polymerization of norbornene and the polymerization of styrene at 333 K, their performance increasing upon the addition of methylalumoxane (MAO) as cocatalyst.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007) [source]

Amphiphilic ruthenium benzylidene metathesis catalyst with PEG-substituted pyridine ligands

JOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 22 2005
Kurt Breitenkamp
An amphiphilic ruthenium benzylidene metathesis catalyst 3 was prepared using poly(ethylene glycol) (PEG)-substituted pyridine ligands. This new catalyst is found to effectively polymerize cyclic olefins both in organic solvents and in water, demonstrating a high level of versatility and providing potential for new future studies in aqueous-based ROMP and other metathesis chemistries. [A color version of the adjacent figure can be viewed in the online issue, which is available at www.interscience.wiley.com.] [source]

Ethylene polymerization by iron complexes with symmetrical and unsymmetrical ligands,

POLYMER INTERNATIONAL, Issue 10 2002
Zhi Ma
Abstract A series of penta-coordinated iron complexes with 2,6-bis(imino)pyridine ligands were prepared and used in ethylene polymerization or oligomerization with methylaluminoxane as (MAO) co-catalyst. The activity of the complexes depends strongly on the steric and electronic effects of the ligands, in which the electronic conjugated system plays an important role. N,N,-Bis(,,,-diphenyl) methyl 2,6-bis(imino)pyridine iron complex (1) could not activate ethylene, N,N,-difluorenyl-2,6-bis(imino)pyridine iron complex (2) exhibited high activity for ethylene oligomerization, whilst N,N,-diaryl 2,6-bis(imino)pyridine iron complexes (3,6) performed ethylene polymerization. The results are collected and briefly discussed. © 2002 Society of Chemical Industry [source]

Influence of solvent on the structures of two one-dimensional cobalt(II) coordination polymers with tetrachloroterephthalate

ACTA CRYSTALLOGRAPHICA SECTION C, Issue 2 2009
Yong-Qin Fang
The title cobalt coordination polymers, catena -poly[[[aquatripyridinecobalt(II)]-,-tetrachloroterephthalato] pyridine solvate], {[Co(C8Cl4O4)(C5H5N)3(H2O)]·C5H5N}n, (I), and catena -poly[[[diaquadipyridinecobalt(II)]-,-tetrachloroterephthalato] 1,4-dioxane trihydrate], {[Co(C8Cl4O4)(C5H5N)2(H2O)2]·C4H8O2·3H2O}n, (II), have been prepared with tetrachloroterephthalic acid (H2BDC-Cl4) under different solvent media. Both complexes form infinite cobalt(II),tetrachloroterephthalate polymeric chains. In (I), two independent CoII ions are six-coordinated through N3O3 donor sets in slightly distorted octahedral geometries provided by two carboxylate and three pyridine ligands, and one water molecule. The structure of (II) contains two independent CoII atoms, each lying on a twofold axis, which adopt a tetragonally distorted N2O4 octahedral geometry via two carboxylate groups, two pyridine ligands and two water molecules. The different stoichiometry of coordinated and solvent guest molecules leads to different two-dimensional supramolecular networks, with (I) utilizing C,H..., and weak ,,, interactions and (II) utilizing mainly conventional hydrogen bonding. [source]

A one-dimensional ladder-like coordination polymer derived from chains formed via hydrogen bonds: catena -poly­[[aqua­di­pyridine­nickel(II)]-,-2,2,-di­thio­dibenzoato-,3O,O,:O,,]

ACTA CRYSTALLOGRAPHICA SECTION C, Issue 9 2004
Wen-Na Zhao
The title one-dimensional chain nickel(II),di­sulfide complex, [Ni(C14H8O4S2)(C5H5N)2(H2O)]n, has each NiII cation coordinated by two N atoms from two pyridine ligands, three carboxyl­ate O atoms from two different di­thio­dibenzoate ligands and one O atom from a coordinated water mol­ecule, in a distorted octahedral coordination geometry. Each di­thio­dibenzoate ion links two NiII cations through its carboxyl­ate O atoms, making the structure polymeric. Hydro­gen-bond interactions between two shoulder-to-shoulder chains lead to the formation of a ladder-like structure. [source]

Crystallographic report: Crystal structure of a one-dimensional zinc(II) coordination polymer containing 4,4,-biphenyldicarboxylate hemihydrate

APPLIED ORGANOMETALLIC CHEMISTRY, Issue 4 2003
Wei Yuan
Abstract A one-dimensional zinc(II) coordination polymer has been constructed from zinc(II), 4,4,-biphenyldicarboxylate and pyridine in which each zinc(II) atom is coordinated by two pyridine ligands and two monodentate 4,4,-biphenyldicarboxylate ligands that define a distorted tetrahedral geometry. Copyright © 2003 John Wiley & Sons, Ltd. [source]

Crystal Structure, Thermal Stability and Luminescence of Coordination Polymer [Cd(BBP)(p -PDOA)]n

CHINESE JOURNAL OF CHEMISTRY, Issue 8 2007
Yan Yang
Abstract Hydrothermal reaction of Cd(NO3)2·4H2O with bbp and p -PDOAH2 at 140 °C yielded a novel 1D cadmium(II) coordination polymer, [Cd(bbp)(p -PDOA)]n (bbp2,6-bis(benzimidazol-2-yl)pyridine, p -PDOAp -phenylenedioxy- diacetate dianion), in which CdN3O4 pentagonal bipyramids were linked by p -PDOA ligands in a bis-bidentate mode to construct a zigzag chain with the adjacent Cd···Cd distance of 1.14(1) nm. There exists a 2D supramolecular network linked by ,-, stacking with a face-to-face distance of 0.35(1) nm between the 2,6-bis(benzimidazol-2-yl) pyridine ligands and hydrogen-bonding interactions (0.27(4) nm). A 3D supramolecular network was further constructed by these non-covalent interactions between the zippers. The TG/DTG showed that its chain skeleton was thermally stable up to 389 °C and the blue fluorescent emission of the complex was determined at 428 nm in a solid state with its long decay lifetime of 7.24 ns. [source]