Synthesis and characterization of TTF salts of planar platinum, palladium, nickel and copper (1,2 dithiooxalato S,SI) anions and the crystal and molecular structure of bis (tetrathiafulvalenium) bis (1,2 dithiooxalato S,SI) palladate (II)

(TTF)3(BF4)2 and [Et4N]2[ML2] [M = Ni, Pd, Pt, Cu; H2L = HSC(O)C(O)SH] gave (TTF)nML2 (M = Ni, n = 1; M = Cu, n = 1.5; M = Pd, n = 2; M = Pt, n = 2,3), which were characterized by IR spectra, elec. cond., and x-ray anal. Crystals of (TTF)2PdL2 are monoclinic, space group P21/c, a 9.447(2), b 11.044(4), c 12.299(1).ANG., ? 113.52(2)?, Z = 2. The structure consists of mixed stacks of (TTF+)2 dimers alternating with PdL22- along the b axis. In the anion, Pd lies on a center of symmetry in a [PdS4] square planar arrangement. In (TTF)2ML2 (M = Pd, Pt) the ground state is essentially ionic, whereas in (TTF)3PtL2 both TTF and (TTF+)2 units are present.