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Bond-valence Approach to the Semicoordination in Seven-Coorinated Copper(II) Complexes with 4-Aminopyridine: Crystal and MOlecular Structure of Bis(4-aminopyridine)di(acetato)(aqua)copper(II)

Grobelny R., Valach F., Głowiak T., Mroziński J.

Polish Journal of Chemistry

2005

Vol. 79 / nr 1

31-36

The structure of [Cu(CH3COO)2(4-aminopyridine)2(H2O)] was X-ray studied. Heptacoordinated copper atoms of [Cu(CH3COO)2(4-aminopyridine)2(H2O)] complex are consistent with bond valence sum model based on orbital metal-ligand interaction. Equatorial plane of deformed tetragonal bipyramid as copper coordination polyhedron is formed by atoms O of carboxylato ligands and water molecule. Two N atoms of 4-aminopyridine molecules occupy the axial sites. Each copper atom is semicoordinated by two atoms O from two carboxylato chelates. The lengths of two semicoordinated Cu...O bonds are 3.041(2)A (twice). Seven-coordinated copper atom of the studied compound and Cu(oxalato)(H2O) (4-aminopyridine)2 is consistent with the bond valence sum model.

Syntheses and Structure of Ni(III) Complexes with 1-Toulene-3,4-dithiole. Bond-Valence Approach to the Oxidation State of the Central Atom

Kameniček J., Valach F., Kratochvil B., Žak Z.

Polish Journal of Chemistry

2002

Vol. 76 / nr 4

483-490

The complex compounds of the formula (R)[NiIII(tdt)2], R = Met4N (I), Et4N (II), Pr4N (III), MePh3P (IV), Ph4P (V); tdt = 1-toluene-3,4-dithiole have been synthesized. The crystal structures of the compounds III and IVwere determined by X-rays studies. Bond valence as a function of inter-nuclear distance for Ni-S bonds was estimated. On the basis of physico-chemical measurements and bond-valence sum model, the formal oxidation state III of Ni atoms for both structures was proposed.