Author： Graf Marion Stoeckli-Evans Helen Whitaker Claire Marioni In Part Pierre- Alain Marty Werner
Publisher： Swiss Chemical Society
ISSN： 0009-4293
Source： CHIMIA International Journal for Chemistry, Vol.47, Iss.6, 1993-06, pp. : 202-205
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Abstract
The ligand pyrazine-2,3,5,6-tetracarboxylic acid in the presence ofCuCl2 and the buffers CH3CO2X/CH3CO2H, X = K+, Rb+, Cs+ and (CH3CO2)2Mg/CH3 CO2H, forms two quite different types of coordination polymers. With the monovalent K+, Rb+, or Cs+ buffer an almost right-angled dimeric unit is formed which polymerizes to form a zig-zag polymer {Cs4[Cu2{pztc)22H2O]∞ 9H2O}∞ (1). This 'dimerizes' about a center of symmetry to form a two-dimensional polymer sheet. With the divalent Mg2+ buffer a mononuclear unit polymerizes to form a quasi-linear polymer {Mg(H2O)6[Cu-(pztc)2H2O] · 2H2O}∞ (2). The X-ray crystal structures of 1 and 2 indicate that the Cuatom exists in two quite different coordination environments (NO3 square pyramidal for 1 and N2O2, square planar for 2) and that the Cu-N(pyrazine) bond distances are much longer than normal.
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