TWO NEW SCHIFF BASE NI II AND CU II COMPLEXES: SYNTHESIS AND STRUCTURES

Abstract

ABSTRACT Schiff base ligands 2-bromo-4-chloro-6-[(2-piperidin-1-ylethylimino)methyl]phenol (BCP) and 2,4-dibromo-6-[(2-morpholin-4-ylethylimino)methyl]phenol (DBP) and their nickel(II) and copper(II) complexes [Ni(BCP) 2 (CH 3 OH) 2 ]·2NO 3 ( 1 ) and [Cu(DBP) 2 ] ( 2 ), have been prepared and characterized by elemental analyses, IR, and single crystal X-ray crystallographic determination. The crystal of ( 1 ) is orthorhombic: space group Pbcn , a = 23.894(1), b = 8.244(2), c = 19.900(2) A, V = 3919.9(10) A 3 , Z = 4. The crystal of ( 2 ) is monoclinic: space group P 2 1 / c , a = 7.072(2), b = 15.426(3), c = 14.214(3) A, β = 96.718(2)°, V = 1540.0(7) A 3 , Z = 2. The Schiff bases coordinate to the metal atoms through the phenolate O and imine N atoms. The Ni atom in ( 1 ) is in an octahedral coordination, and the Cu atom in ( 2 ) is in a square planar coordination. Keywords : Schiff base; nickel complex; copper complex; crystal structure. e-mail: pdsuchemistry@163.com INTRODUCTION Schiff bases have been widely used as versatile ligands in coordination chemistry.