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2 Polish Journal of Chemistry

2 2002

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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.

Non-Symmetrical Nickel(II)dithiocarbamates with NiS2P2-Chromophore

Pastorek R., Kámeniček J., Husárek J., Pavliček M., Šindelár Z., Žak Z.

Polish Journal of Chemistry

2002

Vol. 76 / nr 11

1545-1551

Non-symmetrically substituted Ni(II)dithiocarbamate complexes with NiS2P2 chromophore of composition [Ni(bziprdtc)(PPh3)2]X, [Ni(bziprdtc)(PPh3)2]BPh4_3H2O (bziprdtc- = benzylisopropyldithiocarbamate, PPh3 = triphenylphosphine, BPh4 _ = tetraphenylborate, X = ClO4 _ , PF6 _ ), [Ni(cetdtc)(PPh3)2]X, [Ni(cetdtc)(PPh3)2]PF6, [Ni(cetdtc)(PBut3)2]X (cetdtc- = cyclohexylethyldithiocarbamate, PBut3 = tributylphosphine, X = ClO4 _ , BPh4 _ ) have been isolated. These complexes have been characterized by elemental analysis, IR and UV-VIS spectroscopy, thermal analysis, magnetochemical and conductivity measurements. X-ray structural analysis of [Ni(bziprdtc)(PPh3)2]ClO4_0.5H2O confirms the NiS2P2 chromophore with a slightly distorted square arrangement around the central atom.