Oxalato platinate complexes

Cation-deficient partial oxidation has been effected on the Pt(ox)2 system. Oxidation of Pt(ox)2 with either nitric acid (380), chlorine (244, 245), dichromate (244, 245), hydrogen peroxide (394), or tetracyanodihaloplatinate-(IV) (244, 245, 273) yields copper colored needless of the Pt(ox)2 ion. Oxygen readily oxidizes aqueous solutions of H2Pt(ox)2 to the violet Hi.64-Pt(ox)2(H20)a (273). Table IX lists a variety of partially oxidized bis (oxalato)-platinate complexes. 

In addition to the partially oxidized tetracyanoplatinates, bis(oxalato)platinate-(II) can be nonstoichiometrically oxidized by chemical oxidants13 to form highly lustrous needlelike crystals containing platinum in the 2.36 oxidation state. These complexes have not been characterized to the extent of the tetracyano-platinate complexes however, the oxalato complexes are reported to be highly conducting.13 The starting material is bis(oxalato)platinate(II), which can be prepared in 30% yields from hexachloroplatinate(lV) and potassium oxalate.9... 

Most metal chain complexes involve divalent and partially oxidized square-planar complexes of Ni, Pd, and Pth Examples include the tetracyanoplatinates , bis(oxalato)platinates , bisglyoximato and several complexes containing chelating 7t-conjugated ligands . Nonstoichiometric triplatinum tetraoxides are discussed independently. 

The bis(oxalato)platinate(II) complexes based on [Pt(C204)2] , forms another family of linear chain systems, and the partially oxidised complex series, Cx[Pt(C204)2]-n(H20) (C = K, Rb, Mg " ", Co, Ni, Zn ), was reported.According to elemental analysis and X-ray diffuse scattering measurements, the formal oxidation state of platinum in this series is estimated in the range of -1-2.19 to -f2.38. The average Pt-Pt distance is 2.84-2.89 A and the conductivity at room temperature is 10 -10 S cm , depending on the associated cation. 

Platinates, bis(oxalato)-, 139 cadmium complexes superstructure, 142 cobalt complexes, 140 electrical conductivity, 14] superstructure, 141 thermopower, 141 divalent cation salts, 140 iron complexes structure, 142 lead complexes superstructure, 142 magnesium complexes, 140 electrical conduction, 142 structure, 142 thermopower, 142 modulated superstructure, 139 monovalent cation salts, 139 nickel complexes structure, 141 partially oxidized, 139 Platinates, tetracyano-, 136 anion-deficient salts, 136 electrical conduction, 138 optical properties, 138 cation-deficient salts, 138 oxidation states, 136 partially oxidized, 138 semiconductors, 134 Platinum colloidal... 

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