Bis(saccharinato)copper(II) Complexes with 2-Aminomethylpyridine and 2-Aminoethylpyridine: Syntheses, Crystal Structures, Spectral and Thermal Characterizations of trans-[Cu(sac)2(ampy)2] and [Cu(sac)2(aepy)(H2O)] (ampy = 2-aminomethylpyridine and aepy = 2-aminoethylpyridine)

Abstract

Two bis(saccharinato)copper(II) complexes with 2-aminomethylpyridine (ampy) and 2-aminoethylpyridine (aepy) have been prepared and characterized by elemental analyses, IR and electronic spectroscopy, magnetic measurements and single-crystal X-ray diffraction. The copper(II) ion in trans-[Cu(sac) <inf>2</inf>(ampy)<inf>2</inf>] has -1 site symmetry and is octahedrally coordinated by two neutral ampy and two anionic sac ligands, whereas the copper(II) ion in [Cu(sac)<inf>2</inf>(aepy)(H<inf>2</inf>O)] is five-coordinate with a distorted square-pyramidal coordination geometry. Both ampy and aepy behave as bidentate (N,N′) chelating ligands, while the saccharinate anion (sac) in the title complexes is N-coordinated. IR spectra of both complexes display typical absorption bands of bidentate aminopyridines and N-bonded sac ligands. Thermal decomposition behavior of the complexes is described in detail. © 2005 Taylor & Francis Group Ltd.