A Cu(II) polymeric complex surveying triethanolamine and 1,2-DI(4-pyridyl)ethylene as bridging ligands

Abstract

We report the synthesis and crystal structure of a copper (II) polymeric complex (I) prepared by reaction of Cu(ClO4)(2)center dot 5H(2)O with H(3)tea (triethanolamine,) and dpe (1,2-di(4-pyridyl)ethylene). in ethanol. The compound is made up of two well differentiated substructures, the first one being a cationic 1D polymer balanced by ClO4- counteranions {[Cu-2(H(2)tea)(2)(dpe)]center dot(ClO4)(2)}(n) and the second one made is up of two dimers of different occupancies and charge content, viz., [Cu-2(Htea)(2)(dpe)] (neutral, 64% occupancy) and [Cu-2(H(2)tea)(2)(dpe)](2+) (cationic, 36% occupancy), this latter fraction balancing the charge introduced by ClO4 anions with 72% occupancy.

Both substructures differ in that the H(m)tea anions in the dimers (m = 1,2) do not bridge cations as their homologue H(2)tea does in the polymer, but chelate instead one single Cu each. As shown in scheme.

The structure of (I) is compared with its close relative [Cu-2(H(2)tea)(2)(dpe)]center dot(bpe)center dot(ClO4)(2)center dot H2O (II), where the same original constituents assemble in a slightly different way(1).