Copper(II) complexes derived from (2-carboxymethoxy-phenylamino)acetic acid and analogue

The synthesis and characterization of mononuclear copper complex of (3-oxo-2,3-dihydro-benzo[1,4]oxazin-4-yl)-acetic acid (1) and a tetranuclear copper complex of (2-carboxymethoxy-phenylamino)acetic acid (2) is reported. The sodium salt 1 on reaction with copper(II) chloride hexahydrate followed by treatment with pyridine gave a mononuclear copper complex; whereas, a tetra-nuclear complex in the case of reaction of 2 with copper(II) chloride hexahydrate and 2,2′-bipyridine was obtained. In tetra-nuclear copper(II) complex the NH group co-ordinates to copper and cluster has five co-ordination around copper(II).