Synthesis and crystal structure of two cobalt complexes:: [Co2(4,4′-azpy)5(H2O)6][ClO4]4•(H2O)10•(4,4′-azpy)4 with a novel two-dimensional large rectangle organic-inorganic hybrid network and one-dimensional chain complex {[Co(3,3′-azpy)(H2O)4] [ClO4]2•[3,3′-azpy]3}n (4,4′-azpy=4,4′-azobispyridine, 3,3′-azpy=3,3′-azobispyridine)

The complexes [Co-2(4,4 ' azpy)(5)(H-2)O)(6)][ClO4](4)(.)(H2O)(10)(.)(4,4 ' -azpy)4, (1) and {[Co(3,3 ' -azpy)(H2O)(4)][ClO4](2)(.)[3,3 ' -azpy](3)} (2) (4,4 ' -azpy=4,4'-azobispyridine, 3,3'-azpy=3,3'-azobispyridine) have been synthesized and the structures have been determined. Two-dimensional networks with rectangle channels ca 27.5 Angstrom x 14.2 Angstrom are constructed by [Co-2(4,4 ' -azpy)(5)(H2O)(6)](4+) cations through extensive hydrogen-bonding and pi-pi interaction in compound 1. The compound 2 consists of a one-dimensional zigzag chain structure. (C) 2001 Elsevier Science B.V. All rights reserved.