Four new coordination polymers of Cu(II) with 1,1'-(1,4-butanediyl)bis(imidazole)

Four new complexes, namely [CuL(IN)(2)(H2O)(2)] . 4H(2)O (1), [CuL2(H2O)]Cl-2 . 5H(2)O (2), [CuL2(H2O)](NO3)(2) . H2O (3) and [CuL2]SO4 . 8H(2)O (4), where IN = isonicotinate anion, were obtained from self-assembly of the corresponding copper(II) salts with 1,1'-(1,4-butanediyl)bis(imidazole) (L), and their structures were determined by X-ray diffraction method. In complex 1, each copper(II) cation is six-coordinated by two water molecules and four nitrogen atoms from two L molecules and two isonicotinate anions. Each L molecule coordinates to two copper(II) cations, acting as a bridging ligand. The copper(II) cations are bridged by L to form an infinite zigzag chain structure. In complexes 2 and 3, the copper(II) cation is five-coordinated by one water molecule and four nitrogen atoms from four L molecules. In 4 the copper(II) cation is four-coordinated by four nitrogen atoms from four L molecules. Copper(II) cations are bridged by L ligands to form infinite (4,4) networks that contain 44-membered rings in 2,3 and 4. No interpenetration occurs in 2 and 3, while in 4 two (4,4) networks are interpenetrated in parallel fashion to form a layer. (C) 2003 Elsevier Ltd. All rights reserved.