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Terminal and Bridging Pyrazine Ligands in Coordination Polymers Based on Tetrahedral Cu4OBr6 Centres

A. Broškovičová and G. Ondrejovič

Department of Inorganic Chemistry, Faculty of Chemical Technology, Slovak University of Technology, SK-812 37 Bratislava

 

Abstract: The polymeric Cu4OBr6(pyx)p(Et2O)r complexes I (p = 1.75, r = 0.38), II (p = 2.41., r = 0.63), III (p = 2.65, r = 0.48), IV (p = 3.04, r = 0.56), V (p = 3.52, r = 0.53), and VI (p = 3.95 ,r = 1.00) in the form of microcrystalline powders have been prepared and the amounts of bridging and terminal pyrazine ligands have been determined from their infrared spectre. These: amounts correspond to the related values derived for infinite chains, sheets, and 3D-frameworks based on diamond-like lattice and constructed from the tetrahedral Cu4OBr6 centres. The experimental data indicate that the complex VI is monomeric, the complex I consists of 3D-frameworks, the complexes II and III can be considered to be mixtures of oligomeric sheets and 3D-frameworks, while the complex IV has a chain nature and the complex V is dimeric.

Full paper in Portable Document Format: 521a16.pdf

 

Chemical Papers 52 (1) 16–20 (1998)

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