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

摘要

The complexes [Cu(Sal-(L-Ser))H_2O] centre dot H_2O 1 and [Cu(Sal-Ser)(2-amino pyridine)] 2 have been prepared and their crystal structures determined. In 1 the copper(II) has a square-pyramidal geometry, being coordinated to the tridentate 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 the copper is completed by an axial O(12) atom of an hydroxyl group belonging to an adjacent complex unit. In the racemic ternary complex 2 the metal atom has a square-planar coordination with O,N,O atoms of the tridentate Sal-Ser dianion and the heterocyclic N atom of the 2-aminopyridine. Spectroscopic data are discussed.