Synthesis and crystal structure of one-dimensional carboxylate-bridged copper(II) complex with 2-pyridylmethylamino-3-butyric acid

The tridentate Schiff base carboxylate-containing ligand 2-pyridylmethylamino-3-butyric acid (Hpaba) reacts with copper(II) perchlorate to give the one-dimensional chain complex {[Cu(mu-paba)](ClO4)center dot H2O}(n) (1). The coordination geometry of each copper(II) ion is best described as a square-plane with two nitrogen atoms and one carboxylate oxygen atom of the ligand, and one carboxylate oxygen atom belong to another ligand. It crystallizes in the monoclinic system P2(1)/c with a = 12.717(2), b = 7.9163(15), c = 14.981(2) A, beta = 111.14(1)degrees, V = 1406.8(4) angstrom(3), Z = 4. Cyclic voltammogram of 1 undergoes the reversible one-electron oxidation to the Cu(III) and the reversible one-electron reduction to the Cu(I) state.