Synthesis, characterisation and anti-fungal activities of some new copper(II) complexes of octamethyl tetraaza-cyclotetradecadiene

Abstract

The ligand Me8[14]diene, L, in its free state as well as in the dihydroperchlorate form, L.2HClO4, coordinates copper(II) in different salts to yield a series of [CuLX(x)]X(y).(H2O)(z) complexes where X = NO3, ClO4, NCS, Cl and Br; x and y may have values of 0 or 2 and z = 0, 1 or 2. The complex, [CuL(ClO4)2].2H2O is found to undergo axial ligand substitution reactions with SCN-, NO3- and Cl- to give a variety of substitution derivatives: [CuL(ClO4)(m)X(n)] where X = NCS, NO3 and Cl; m = 0 or 1, and n = 1 or 2. The complexes have been characterised on the basis of analytical, spectroscopic, magnetic and conductance data. The anti-fungal activities of the ligand and its complexes have been investigated against a range of phytopathogenic fungi.