1D copper(II) and zinc(II) coordination polymers containing an unusual twisted oxalate bridge
作者:Ju An Kim、Hanyoung Park、Ju Chang Kim、Alan J. Lough、Sang Yong Pyun、Jungyun Roh、Byung Min Lee
DOI:10.1016/j.ica.2007.10.028
日期:2008.5
Two new copper(II) complexes, Cu(L1)(ClO(4))(2) (1), [(mu-oxalate)Cu(L1)] center dot 5H(2)O}(n) (2), and a zinc(II) complex, [(mu-oxalate)Zn(L2)] center dot 3H(2)O center dot 0.5DMF}(n) (3) (L = 3,14-dimethyl-2,6,13,17-tetraazatricyclo[14,4,0(1.18),0(7.12)]docosane), have been synthesized and characterized by X-ray crystallography. In 1, the ligand conformation is planar, and the octahedral coordination about the copper(II) ion is completed by weakly interacting ClO(4)(-) ions. In 2 and 3, bridging oxalate ligands coordinate to copper(II) or zinc(II) ions in an unusually twisted bis-monodentate (trans-1,10-bicoordination) mode.The rigidity and steric hindrance of macrocycles L1 and L2 by the introduction of two cyclohexane rings and methyl groups on a cyclam (1,4,8,11-tetraazacyclotetradecane) skeleton cause the bridging oxalate ligands to adopt such unusual geometries in 2 and 3. (C) 2007 Elsevier B.V. All rights reserved.