Crystal structures of the N-salicylidene-L-serinatoaquacopper(II) monohydrate and its ternary derivative with 2-aminopyridine

The complexes [Cu(Sal-(L-Ser))H2O]. H2O 1 and [Cu(Sal-Ser)(2-amino pyridine )] 2 have been prepared and their crystal structures determined. In 1 the c opper(II) has a square-pyramidal geometry, being coordinated to the uidenta te Sal-(L-Ser) Schiff base ligand and the oxygen atom (O(16)) of one water molecule occupying the corners of a square. The coordination sphere about t he copper is completed by an axial O(12) atom of an hydroxyl group belongin g to an adjacent complex unit. In the racemic ternary complex 2 the metal a tom has a square-planar coordination with O,N,O atoms of the bidentate Sal- Ser dianion and the heterocyclic N atom of the 2-aminopyridine. Spectroscop ic data are discussed. (C) 1999 Elsevier Science Ltd. All rights reserved.