Synthesis and crystal structure of two cobalt complexes: [Co-2(4,4 '-azpy)(5)(H2O)(6)][ClO4](4 center dot)(H2O)(10 center dot)(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 center dot)[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 be en synthesized and the structures have been determined. Two-dimensional net works with rectangle channels ca 27.5 Angstrom x 14.2 Angstrom are construc ted by [Co-2(4,4 ' -azpy)(5)(H2O)(6)](4+) cations through extensive hydroge n-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.