The effect in the assembly and node nuclearity of the long and rigid character of bis-pyridyl exo-bidentate spacers when react with zinc acetate: Crystal structures of the high nuclearity coordination polymers [Zn-7(mu(4)-O)(2)(OAc)(10)(3pdb)](n) (3p

摘要

The long and rigid spacers 1,4-bis(3-pyridyl)-2,3-diaza-1,3-butadiene (3pdb) and 1,4-bis(4-pyridyl)-2,3-diaza-1,3-butadiene (4pdb) exhibit a self-assembly reaction with zinc acetate to produce the new coordination polymers [Zn-7(mu(4)-O)(2)(OAc)(10)(3pdb)](n) (1) and [Zn-7(mu(4)-O)(2)(OAc)(10)(4pdb)](n) (2). The X-ray crystallography results show one-dimensional polymeric chains with the cluster moiety (Zn-7(mu(4)-O)(2)(OAc)(10)} as a node. The formation of the heptanuclear nodes is discussed on the basis of the key importance of the length of the spacer. (C) 2006 Elsevier Ltd. All rights reserved.