A heteronuclear (Pt,Zn) complex of 1-methyluracil with different coordination geometries (square-planar and square-pyramidal) of the two metals |
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| Authors: | Helmut Schöllhorn Ulf Thewalt Bernhard Lippert |
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| Affiliation: | Sektion für Röntgen- und Elektronenbeugung, Universität Ulm, D-79 Ulm, F.R.G.;Anorganisch-Chemisches Institut, Technische Universität München, D-8046 Garching, F.R.G. |
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| Abstract: | Reaction of cis-(NH3)2Pt(1-MeU)2 (1-MeU = 1- methyluracil anion, C5H5N2O2) with ZnSO4·7H2O leads to the formation of a dinuclear complex of composition [(NH3)2Pt(C5H5N2O2)2Zn(H2O)3]SO4· 2H2O. The compound crystallizes in space group P21/c with a = 10.534(1), b = 17.933(2), c = 11.490(1) Å, β=94.61(1)°, Z=4. The structure was refined to R=0.043 and Rw=0.061. In this compound, Pt is coordinated through N3 to the 1-MeU ligand, while Zn is bound through the two O4 oxygens and completes its distorted square-pyramidal coordination sphere by three aqua ligands. The positions of the two metals relative to their basal donor atoms and the shortness of the PtZn separation (2.760(1) Å) suggest a bonding interaction between the two metals. Using 1H NMR spectroscopy, a formation constant of ca. 114 1 mol?1 for the Pt, Zn complex has been estimated. |
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| Keywords: | Author to whom correspondence should be addressed. |
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