Synthesis and X-ray crystal structure of a 24-membered macrocyclic binuclear cadmium(II) complex with pendant arms

A new binuclear cadmium(II) macrocyclic complex has been synthesized by [2 + 2] Schiff base condensation of tris(2-aminoethyl)amine (tren) with sodium 2,6-diformyl-4-bromophenolate (sdbp) in the presence of Cd2+ ion. The crystal structure of the complex [Cd2L](ClO4)(2) . 0.5CH(3)OH has been determined by X-ray methods. Crystals are monoclinic, space group P2(1)/c with a 11.633(15), b = 16.370(2), c = 21.193(2) Angstrom, beta = 96.121(12)degrees Z = 4, V = 4013.0(8) Angstrom(3), F(000) = 2180, D-c = 1.841 g cm(-3), mu = 32.46 cm(-1) R = 0.049, R-w = 0.069. Two cadmium(II) ions are bridged by two mu(2)-phenoxy oxygen atoms. Each cadmium lies in a N4O2 coordination environment. Coordination geometry around Cd(II) is a capped trigonal bipyramid. Coordination of phenoxy oxygens and terminal amino groups enhances the stability of the complex.