STRUCTURES OF 2 COPPER(II) COMPLEXES WITH N,N-BIS(2-CARBAMOYLETHYL)AMINOACETIC ACID, [CU-2(BCEGLY)(2)(H2O)](CLO4)(2) AND [CU(BCEGLY)(NCS)]

The syntheses and X-ray crystal structure study of two Cu(II) complexe s with N,N-bis(2-carbamoylethyl)aminoacetic acid-[Cu-2(Bcegly)(2)(H2O) ](ClO4)(2), (I) and [Cu(Bcegly)(NCS)] (II)-are reported. Structure I c onsists of cationic dimers formed due to the chelate-bridging glycinat e group of one of the Bcegly(-) ligands, and ClO4- anions. Although tw o symmetrically-independent Cu atoms in I are equivalently coordinated with the donor atoms of the Bcegly(-) ligands (N + 3O), they have dif ferent environments: the coordination of the Cull) atom is complemente d to (4 + 1) by the bridging O atom of the adjacent complex, and the c oordination of the Cu(2) atom is complemented to (4 + 1 + 1) by the O atoms of the water molecule and a ClO4- anion. Structure II consists o f discrete complexes. The distorted tetragonal-bipyramidal coordinatio n of the Cu atom is formed by the (N + 3O) atoms of the Bcegly(-) liga nd and the N atom of the NCS- anion. An extremely weak additional Cu . .. S interaction links complexes into centrosymmetric pseudodimers.