ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

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)