SiP2, FeS2, and AuSb2 crystallize with pyrite structure. The structural topologies of the three compounds are comparable, while their constituting elements belong to very different groups of the periodic system of the elements. This fact motivates our interest in finding some criteria for the stability of their atomic arrangements. We used density functional methods (LCAO-CO Ansatz) to characterize the topological properties of the electron density: in addition to the results from theoretically determined structural parameters, band structures, and the electron localization function, the electronic charges of the corresponding atoms are calculated on the basis of Bader's zero-flux surface approach. It is shown, that charge transfer between the constituting elements of the pyrite structure is a characteristic feature of the structural stability in the title compounds. The detailed results on the partial density of states for all studied compounds finally allow the explanation of the theoretically determined density topology on the atomic level.

High temperature (HT) powder X-ray diffraction measurements and dilatometric investigations were carried out on microcrystalline NaZnPO4, KZnPO4 and TlZnPO4.The alpha- or room temperature (RT)-NaZnPO4 [1] with beryllonite-type (NaBePO4 [2]) structure undergoes a phase transition at 888 degreesC to a kalsilite (KAlSiO4 [3, 4])-like structure with the lattice constants a = 5.101(3) Angstrom, c = 8.365(8) Angstrom (at 920 degreesC), space group P 6(3), Z = 2. A distorted kalsilite-type structure (a = 8.748(7) Angstrom, c = 8,054(7) Angstrom, space group P 6(3), Z = 6) is formed, when pellets of NaZnPO4 were quenched from about 950 degreesC to room temperature.The alpha- or RT-KZnPO4 [5] transforms reconstructively at 683 degreesC from alpha -KAlGeO4-type [6] structure to the Icmm-type structure (a = 9.1480 (7) Angstrom, b = 53459(4) Angstrom, c = 8.7164(6) Angstrom at 740 degreesC, space group P c 2(1) n, Z = 4), in accordance with [7].The RT (alpha) [8] and the HT-forms of TlZnPO4 show Icmm-topology structures. The lattice constants of beta -TlZnPO4 at 300 degreesC are a = 9.1272(7) Angstrom, b = 5.4478(5) Angstrom, c = 8.6807(7) Angstrom, space group P c 21 n, Z = 4. The values for the gamma -polymorph at 500 degreesC are a = 9.3203(6) Angstrom, b = 5 4207(4) Angstrom, c = 8.6988(6) Angstrom, space group P c m n, Z = 4,Topological and structural chemical aspects of the MZnPO4 compounds (M = Na, K, TI) and their polymorphs will be discussed.

Molybdenum nitride was synthesized by the reduction of molybdenum dioxide with ammonium chloride under extreme conditions of high pressure and high temperature. The product was examined with XRD measurement. The results show that the MoN has the hexagonal symmetry with lattice constants of a=0.572(9) nm, c=0.560(4) nm, and space group of P63/mmc. The Mo atoms are at the positions 2b(0,0,1/4) and 6h(x,2x,1/4), x=0.48(9), The N atoms are at the positions 2a(0,0,0) and 6g(0.5,0,0). This method has many advantages: the reaction condition is very easily carried out, the product is pure phase, and the reaction time is short.

AbstractChemInform 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.

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In the crystal structure of the title complex, [Pt(C9H6NS)(2)], although the aromatic ligands are coordinated to a central heavy metal stem. T-shaped and shifted pi-stacked arrangements of the aromatic moieties are preferred, leading to a sandwich herring-bone type of crystal-packing motif. The crystal structure is therefore consistent with the view that the arene-arene interactions are determined by electrostatics (multipole-multipole).

AbstractChemInform 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.

AbstractChemInform 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.

AbstractChemInform 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.

AbstractChemInform 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.

AbstractChemInform 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.

AbstractChemInform 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.