Pentahalophenyl ethylxante complexes of platinum(II). Structures of (NBu4)[Pt(C6F5)2(S2COEt)] and (NBu4)2{Pt4(C6F5)8[(μ[in3]-S)SCOEt]2}. Unprecedented coordination of the xanthate ligands in the tetranuclear complex (original) (raw)

1995, Inorganica Chimica Acta

Novel anionic xanthate complexes of platinum(II) with the xanthate ligands displaying different coordination modes have been prepared: (a) mononuclear complexes (NBu4)[Pt(C6Xs)2(S2COEt)] (X=F (1) or CI (2)), where the xanthate ligand acts as a chelate; (b) mononuclear complexes (NBu4)[Pt(C6Xs)2(SC(S)OEt)PPh3] (X=F (3) or CI (4)) containing monodentate SC(S)OEt ligands; and (c) tetranuclear complexes (NBu4)2{Pt4(CvXs)s[(~3-S)SCOEt]2 } (X=F (5) or CI (6)), where one of the S atoms bridges three platinum centres, an unprecedented bonding mode for the xanthate ligand. The structures of complexes 1 and 5 have been established by single crystal X-ray diffraction. Compound 1 is triclinic, space group Pi, with a=9.472(1), b=11.005(2), c=18.561(2) A, a=75.90(1), /3=81.23(1), 3,=75.99(1) °, V=1811.7(4) /~3 and Z=2. The structure was refined to residuals of R=0.0299 and Rw=0.0419. Complex 5 is also triclinic, space grotip Pi, with a=11.121(1), b=15.184(1), c=16.722(1) ~, a=64.17(1), /3=80.56(1), 3,=88.41(1) °, V=2504(1) /~3 and Z=I. The structure was refined to residuals of R = 0.0409 and Rw = 0.0417. * Corresponding author. 0020-1693/95/$09.50 © 1995 Elsevier Science S.A. All rights reserved SSDI 0020-1693(94)04343-T 2.2. Physical measurements C, H and N analyses were carried out on a Perkin-Elmer 240 microanalyzer. Melting points were measured