Resumo

ANGULO-CORNEJO, Jorge R. et al. Two unexpected structures of platinum group metal complexes with 1,2-dihydro-2,5-diphenyl-3H-1,2,4-triazole-3-thion. Rev. Soc. Quím. Perú [online]. 2009, vol.75, n.2, pp.153-162. ISSN 1810-634X.

Palladium (II) and platinum (II) complexes 5 and 6 were synthesized using 1,2-dihydro-2,5-diphenyl-3H-1,2,4-triazole-3-thion 3 as a ligand from an isomeric mixture of 3 and 4. The unexpected structures of 5 and 6 were investigated by mass spectra, IR (DRIFT), and ESCA measurements as well as crystal structure determinations. The palladium (II) complex is tetranuclear with two groups of Pd central atoms with different coordination geometries. Two Pd atoms have coordination number 5 (square pyramidal) with a weak Pd-Pd bond between both coordination centers. The other Pd atoms show coordination number 4 (square planar). In the structure of the platinum (II) complex anion the Pt atom is surrounded by four sulphur atoms of the thion groups arranged in a square planar coordination. The crystal structure shows an extended system of hydrogen bonds that obviously determine the configuration of the complex anion.

Palavras-chave : Palladium and platinum (II) complexes; structures; triazole-3-thion; square planar and square pyramidal coordination; Pd-Pd coordination; anionic platinum complex.

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