Synthesis and EXAFS investigation of azomethynic copper metallochelates with an N,S,O ligand environment

Neutral copper complex of different composition (CuL21 and CuL (OAc)-O-2) a nd structure were obtained by coupling the 1-phenyl(isopropyl)-3-methyl-4-( N-substituted)aldimino-5-oxy(thio,seleno)pyrazoles (HL1), and 2-hydroxy(tos ylamino)-N-(8-quinolyl)benzaldimine (HL2) with copper(II) acetate. Accordin g to X-ray structural data, the CuL21 complexes possess the pseudotetrahedr al structure, and the (CuLOAc)-O-2 complexes, the square-pyramidal one. The complexes were studied by EXAFS spectroscopy. EXAFS spectral data on the n earest ligand environment show a good correlation with the X-ray structural results. (C) 2000 Elsevier Science B.V. All rights reserved.