TRINUCLEAR AND TETRA-NUCLEAR PALLADIUM(II) AND OR PLATINUM(II) COMPOUNDS WITH DOUBLE THIOLATO BRIDGES - CRYSTAL-STRUCTURE OF [P(CH2PH)PH3]2[(C6F5)2PD(MU-SC6F5)2PT-(MU-SC6F5)2PT(MU-SC6F5)2PD(C6F5)2]

The complexes cis-[M(C6F5)2(thf)2] (M = Pd or Pt, thf = tetrahydrofuran) react (2:1) with [NMe4]2[M'(SC6F5)4][M'= Pd or Pt] or Q2[M'2(SC6F5)6] [M' = Pd, Q = NBu4; M' = Pt, Q = NMe4 or P(CH2Ph)Ph3] to give homo- or hetero-metallic tri- or, respectively, tetra-nuclear dianions. The structure of the tetranuclear complex [P(CH2Ph)Ph3]2[(C6F5)2Pd(mu-SC6F5)2Pt(mu-SC6F5)2Pt(mu-SC6F5)2Pd(C6F5)2] has been established by single-crystal X-ray crystallography: the dianion possesses a crystallographic inversion centre; space group P1BAR, a = 12.247(2), b = 12.901(2), c = 17.942(3) angstrom, alpha = 84.47(2), beta = 78.20(2), gamma = 77.21(2)degrees, Z = 1, and R = 0.0454. The co-ordination at the metal atoms is planar. The outer (palladium) planes form an angle of 28.20(11)-degrees with the inner ones.