THE CRYSTAL-STRUCTURES AND ELECTROCHEMICAL STUDIES OF 3 2,3-NAPHTHALENIC SCHIFF-BASE COPPER(II) COMPLEXES

Three 2,3-naphthalenic Schiff base ligands 3-hydroxy-N-cyclopentyl-2-n aphthaldimine (I), 3-hydroxy-N-cycloheptyl-2-naphthaldimine (II), 3-hy droxy-N-cyclooctyl-2-naphthaldimine (III) and their corresponding Cu-1 1 complexes (1-3) have been prepared and characterized. The crystal an d molecular structures of -oxo-2H-naphth-2-ylidene)methyl]aminato}copp er(II) (1), oxo-2H-naphth-2-ylidene)methyl]-aminato}copper(II) (2) and xo-2H-naphth-2-ylidene)-methyl]-aminato}copper(II) (3), have been obt ained. The X-ray study shows that the geometry around the metal atom i s intermediate between square planar and tetrahedral. Additionally, el ectrochemical studies on the complexes (1)-(3), show a dependence of t he Cu-II/Cu-I potentials on the grade of distortion of the structure. (C) 1998 Elsevier Science Ltd. All rights reserved.