TEMPLATE SYNTHESIS OF ASYMMETRICAL NICKEL(II) OF SUBSTITUTE MONO-BENZO-N-4 AND EFFECT OF SUBSTITUTE FOR METHINE SITES IN THEIR COMPLEXES

Reaction of a 1:1 mixture of the appropriate phenylenediamine (e.g. 4- methyl-1,2-phenylenediamine 4-chloro-1,2-phenylenediamine) and alkylen ediamine (e.g. ethylenediamine and propylenediamine) with 2,4-pentaned ione in presence of nickel(II) salt gave a series of asymmetrical nick el(II) complexes of the [Me(4)-RBzo[X]tetraeneN(4)](2-) ligand (where R = CH3 or Cl; X = 14 or 15). These complexes were investigated by mea ns of mass, infrared, NMR and electronic spectra. Hammett plots of the C-13 NMR resonances of methine carbons for [Ni-(Me(4)-RBzo[X]tetraene N(4)] complexes (where R = CH3, H, Cl or NO2; X = 14 or 15) vs sigma(p ) were linear and had slopes of 2.97 and 2.63 for 14-membered and 15-m embered complexes, respectively. Copyright (C) 1996 Elsevier Science L td