Metallo ligands: Part V - Homo and bimetallic trinuclear complexes of copper(II), nickel(II) and cobalt(II) with 1,8-di-(2'-hydroxyphenyl)- 4,5-diphenyl-2,3,6,7-tetrazaoctan-1,3,5,7-tetraene

Abstract

A series of homo/bimetallic (hetero) trinuclear complexes of the type [M Cu ML₂X₂(H₂O)_n] where M = copper(II), nickel(II) and cobalt(II), H₂L = 1,8-di-(2'-hydroxyphenyl)-4,5-diphenyl- 2,3,6,7-tetrazaoctan-1,3,5,7-tetraene, X = Cl^-, Br^- and NO<img src='/image/spc_char/3_bar.gif' border=0>, n = 0 or 4 have been isolated in a stepwise reaction from the precursor bis(1,2-diphenylethane-1,2-dione-dihydrazone) copper(II) complexes. The complexes have been characterised on the basis of elemental analyses, spectral, magnetic, conductivity and thermal studies. Most of the complexes contain coordinated water and have low molar conductivity. The metal centres have an approximately octahedral symmetry around them except Ni-Cu-Ni system, where a square planar geometry has been proposed around terminal nickel centre. Different spectral parameters have also been calculated. The homo trinuclear copper(II) complexes exhibit significant fungitoxicity.