Influence of steric bulk of ligands on the electronic spectra of metal complexes of cu (ii)
International Journal of Development Research
Influence of steric bulk of ligands on the electronic spectra of metal complexes of cu (ii)
Received 22nd January, 2017; Received in revised form 17th February, 2017; Accepted 23rd March, 2017; Published online 20th April, 2017
Copyright©2017, Sumit Kumar Sinha et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Schiff’s bases of 2-formyl Pyridine and 6-methyl-2-formylpyridine had been prepared with different aliphatic ammines like n-propylammine, iso-propylammine and tertiarybutylammine. These Schiff’s base ligands of different steric bulk had been used for complexation with Cu(II) metal ion. The complexes were formulized as [CuL2X2] where, L is 2-formylpyridine n-propylimine (FPI), 2-formylpyridineisopropylimine (FIPI), 2-formylpyridinetertiarybutylimine (FTBI), 6-metyl 2-formylpyridine, n-propylimine (MFPI), 6-methyl 2-formylpyridineiso-propylimine (MFIPI) and 6-methyl-2-formylpyridinetertiarybutylimines (MFTBI), while X is chlorine. It was observed that d-d transition bands shifts to lower frequency with increasing steric bulk near the donor site of the ligands. The ESR parameters like g, g||, A, A|| and G, however, were not found to be influenced appreciably by the steric bulk of the ligands. The order of the values of ESR parameters i.e., g|| > g > 2 was indicative of tetragonal distortion in octahedral symmetry of all the Cu (II) complexes, with elongation along Z – axis.
