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)

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