The synthesis and crystal structure of one novel ternary complex of 2,2'-bipyridine N-salicylidenetyrosinatocopper(II)

The crystal structure of copper(II)-salicylidene-aminoacidate Schiff base-nitrogen-donor chelating ligand, [Cu(sal-tyr)(bipy)] (sal-tyr: N-salicylidenetyrosinato; bipy: 2,2'-bipyridine) which is obtained by means of one-step synthesis, is presented. It crystallizes in space group P2(1)2(1)2(1) with a = 9.0356(18) Angstrom, b = 11.992(2) Angstrom, c = 20.618(4) Angstrom. The Cu-II ion is five coordinated by one oxygen atom of carboxylate, the imine nitrogen atom, and the hydroxyl oxygen atom of the salicylidene in the Schiff base anion as well as two nitrogen atoms of bipy, resulting in a seriously distorted square pyramid coordination polyhedron. The phenol group and the apical coordination bond Cu(l)-N(2) are in the same side of the Schiff base chelating plane which could be attributed to the intramolecular C-H ... pi interaction between the H(17) of the bipy and the benzene ring of the phenol. The hydrogen bond between the hydroxyl hydrogen atom of the phenol group and the coordinated oxygen atom of the carboxylate from neighboring molecule is helpful to stabilize the crystal.