Dithiolato Ligands Research Articles

Preparation and properties of bis(oxalato)platinate and bis(1,3-dithiole-2 thione-4, 5-dithiolato)metallate (M = Ni, Pd, and Pt) anion salts with the 1,4-diethylpyrazinium dication

Reactions of [Pt(C 20 4) 2] 2− (C 20 4 2− oxalate anion) and [M(C 3S 5) 2] m− (C 3S 5 2−  1,3-dithiole-2- thione-4,5-dithiolate anion; m  2 for Ni, Pd and Pt; m = 1 for M  Ni and Pt) with the 1,4-diethylpyrazinium dication (DEPZ 2+) in acetonitrile gave partially oxidized metallate-anion salts: [DEPZ] 0.9 [Pt(C 20 4) 2] and [DEPZ] 0.3–0.35 [M(C 3S 5) 2] (M  Ni, Pd and Pt). They behave as typical semiconductors in the temperature range of −30–+40 °C; electrical resistivities of the [Pt(C 20 4) 2] and [M(C 3S 5) 2] salts are 3.7 × 10 5 and 13−620 Ω cm, respectively, at 25 °C for compacted peltets. IR and X-ray photoelectron spectra indicate that the partial oxidation of [M(C 3S 5) 2] m− by DEPZ 2+ occurs essentially at the dithiolato ligand.