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A heteronuclear (Pt, Zn) complex of 1-methyluracil with different coordination geometries (square-planar and square-pyramidal) of the two metals by Helmut Schöllhorn; Ulf Thewalt; Bernhard Lippert is a Chemistry article available to read on EtoBox.

What is A heteronuclear (Pt, Zn) complex of 1-methyluracil with different coordination geometries (square-planar and square-pyramidal) of the two metals about?

Reaction of cis-(NH3)2Pt(l-MeU)2 (l-MeU = lmethyluracil anion, C5H5NZ02) with ZnS04\*7Hz0 leads to the formation of a dinuclear complex of composition [(NHs)2Pt(C5HsN202)2Zn(HZ0)31S04. 2Hz0. The compound crystallizes in space group P2,/c with a = 10.534(l), b = 17.933(2), c = 11.490-(1) A, fi = 94.61(l)', Z= 4. The structure was refined to R = 0.043 and R, = 0.061. In this compound, Pt is coordinated through N3 to the l-MeU ligand, while Zn is bound through the two 04 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 Pt-Zn separation (2.760(l) A) suggest a bonding interaction between the two metals. Using 'H NMR spectroscopy, a formation constant of ca. 114 1 mol-' for the Pt, Zn complex has been estimated. so far, a distorted tetrahedral with Ag [4], and a square-planar with Pt [S], Mn [6], and Cu [la]. Once the dinuclear complex is formed, the geometry of a third entering metal appears to be dictated by the geometry of the second metal i.e. square-planar, if the second metal is coordinated this way [7], and tetrahedral, if the second metal has

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Author

Helmut Schöllhorn; Ulf Thewalt; Bernhard Lippert

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0020-1693)

Published

1985

Language

EN

Field

Chemistry (Physical Sciences)