THE INVESTIGATION OF SUBSTİTUENT EFFECTS ON SOME LI- GAND-FIELD PARAMETERS OF SOME PSEUDO-OCTAHEDRAL NICKEL(II) COMPLEXES

The ligand-field parameters Dq,p' and p of pseudo-octahedral Ni(H) complex of N-(2- hydroxyphenyl)-salicylaldimine and twelve different derivatives were calculated. Substituent effects on these parameters are discussed. Dq values were found to be higher and p values to be lower in those complexes bearing electron withdrawing NO2 groups, than the respective values in the unsubstituted parent complex. On the other hand, Dq's were found to be lower and P's to be higher in complexes carrying electron donating groups like CH3., C1 and Br in comparison with those of the parent complex.