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X-ray Powder Diffraction Studies (x-ray + powder_diffraction_studies)

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Chemistry100%

Selected Abstracts

Synthesis and X-Ray Powder Diffraction Studies of Semiconducting Alloys in the System AgCd2-xZnxGaS4.

CHEMINFORM, Issue 11 2006
O. V. Parasyuk
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, please click on HTML or PDF. [source]

X-Ray Powder Diffraction Studies of Tl2TeBr6 and Tl2TeI6.

CHEMINFORM, Issue 25 2004
V. I. Sidey
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

Synchrotron X-Ray Powder Diffraction Studies on the Phase Transitions in LiMn2O4.

CHEMINFORM, Issue 12 2004
P. Piszora
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

The Role of Functionalisation, Asymmetry and Shape of a New Macrocyclic Compartmental Ligand in the Formation of Mononuclear, Homo- and Heterodinuclear Lanthanide(III) Complexes

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 1 2009
Sergio Tamburini
Abstract The compartmental [1+1] macrocycle H3L, obtained by self-condensation of the formyl precursor 3,3,-(3,6-dioxaoctane-1,8-diyldioxy)bis(2-hydroxybenzaldehyde) with the amine precursor N,N -bis(2-aminoethyl)-2-hydroxybenzylamine, contains one inner ON3O2 Schiff base and one outer O2O4 crown-like chamber. According to the experimental conditions it forms, by a template process, the stable mononuclear complexes Ln(H3L)(Cl)2(CH3COO)·nS·mHCl or [Ln(L)]·nS (Ln = La, Lu, Y, Yb, Er, Dy, Tb, Gd, Eu, Ce) with the lanthanide(III) ion encapsulated in the crown-ether-like and in the Schiff base site. The mononuclear complexes Ln(H3L)(Cl)2(CH3COO)·nS·mHCl, by further complexation with a different lanthanide(III) ion, give rise to the related heterodinuclear complexes [LnLn,(L)(Cl)2(CH3COO)]·nS while the homodinuclear and the heterodinuclear complexes [Ln2(L)](Cl)3·nH2O and [LnLn,(L)](Cl)3·nS could be prepared by a template reaction using the appropriate molar ratio of reactants. Their properties have been studied by using SEM-EDS microscopy, IR and NMR spectroscopy and their compositions confirmed by thermal and ESI-Mass spectrometric analyses. In the heterodinuclear complexes, the site occupancy of the different lanthanide(III) ions was determined by 1H and 13C NMR spectroscopy in CD3OD or (CD3)2SO , it was found that heterodinuclear complexation occurs in methanol with the smaller lanthanide(III) ion mainly coordinating to the Schiff base site and the larger lanthanide(III) ion to the crown site whereas, in dimethyl sulfoxide, demetalation of the weaker coordinated lanthanide(III) ion into the crown ether chamber occurs with the subsequent formation of mononuclear species in solution. The thermal decomposition of the heterodinuclear complexes forms the related mixed oxides, the stoichiometries and properties of which were determined by SEM-EDS microscopy and X-ray powder diffraction studies (XRD). (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009) [source]

High-pressure properties of TiP2O7, ZrP2O7 and ZrV2O7

JOURNAL OF APPLIED CRYSTALLOGRAPHY, Issue 1 2001
Stefan Carlson
High-pressure synchrotron X-ray powder diffraction studies of TiP2O7, ZrP2O7 and ZrV2O7 have been performed. The ZrV2O7 structure undergoes a reversible transition at 1.38,1.58,GPa from cubic ,- to pseudo-tetragonal ,-ZrV2O7 that displays an orthorhombic 2 × 3 × 3 supercell. At pressures above 4,GPa, ZrV2O7 becomes irreversibly X-ray amorphous. No such transformations are observed for TiP2O7 and ZrP2O7, which compress smoothly up to the highest investigated pressures (40.3 and 20.5,GPa, respectively). These differences in high-pressure properties are discussed in terms of the negative thermal expansion of ZrV2O7. The bulk moduli at ambient pressure (B0) for TiP2O7, ZrP2O7, ,-ZrV2O7 and ,-ZrV2O7 were estimated to be 42,(3), 39,(1), 17.0,(7) and 20.8,(10),GPa, respectively. [source]

Powder study of poly[(,2 -2,2-dimethylpropane-1,3-diyl diisocyanide)-,2 -iodido-silver(I)]

ACTA CRYSTALLOGRAPHICA SECTION C, Issue 3 2009
Mwaffak Rukiah
In order to explore the chemistry of the bidentate ligand 2,2-dimethylpropane-1,3-diyl diisocyanide and to investigate the effect of counter-ions on the polymeric structure of (2,2-dimethylpropane-1,3-diyl diisocyanide)silver(I) complexes, the title polymeric compound, [AgI(C7H10N2)]n, was synthesized by treatment of 2,2-dimethylpropane-1,3-diyl diisocyanide with AgI. X-ray powder diffraction studies show, as expected, a polymeric structure, similar to the very recently reported Cl, and NO3, analogues [AgX(C7H10N2)]n (X = Cl, or NO3,). In the title structure, the AgI centre is bridged to two adjacent AgI neighbours by bidentate 2,2-dimethylpropane-1,3-diyl diisocyanide ligands via the NC groups to form [Ag{CNCH2C(CH3)2CH2NC}]n chains. The iodide counter-ions crosslink the AgI centres of the chains to form a two-dimensional polymeric {[Ag{CNCH2C(CH3)2CH2NC}]I}n network. This study also shows that this bidentate ligand forms similar polymeric structures on treatment with AgX, regardless of the nature of the counter-ion X,, and also has a strong tendency to form polymeric complexes rather than dimeric or trimeric ones. [source]

Synthesis, X-ray powder structure analysis and biological properties of a mononuclear Cu(II) complex of N-2-hydroxyhippuric acid

APPLIED ORGANOMETALLIC CHEMISTRY, Issue 12 2009
Soumya Basu
Abstract A mononuclear copper (II) complex of N-2-hydroxyhippuric acid (2HHA), [Cu(HA)(H2O)2], has been synthesized and characterized by spectroscopic and X-ray powder diffraction studies. Crystal structure of [Cu(HA)(H2O)2] reveals a distorted square-pyramidal geometry around the metal center. The crystal packing in the complex exhibits a three-dimensional framework formed by intermolecular O; H···O and CH···O hydrogen bonds. Toxicity and antitumor properties of the complex have been studied in vivo. The complex, capable of depleting glutathione (GSH) at nontoxic doses, may be utilized to sensitize drug-resistant cells where resistance is due to an elevated level of GSH. Copyright © 2009 John Wiley & Sons, Ltd. [source]