X-ray absorption near edge structure and extended x-ray absorption fine structure study of cobalt [co (ii)] complexes synthesized with ligands of para, ortho and Meta Nitroaniline dithiocarbamate
Anurag Geete, BD Shrivastava, Ashutosh Mishra
In present investigation, three cobalt [Co(II)] complexes were synthesized using various ligands of nitroaniline dithiocarbamate. The synthesized Co(II) complexes were studied for different structural and chemical parameters using XANES and EXAFS conducted on DXAFS beamline BL-8, Indus 2, Synchrotron source. The EXAFS spectra recorded for Co(II) complexes were used for computation of the bond length, chemical shift, effective nuclear charge, principal absorption maxima and edge width using Athena and Origin 6.0 software. The results of the study revealed that, all the cobalt complexes synthesized and studied showed higher value for K-absorption edge (Ek) than Co metal. Similarly, all the cobalt complexes synthesized and studied showed higher value for Absorption maxima (EA) than Co metal. The Chemical shift (ΔEK) value for Co(II) complexes were ranged 1.07-2.71 eV. The Shift of principal absorption maxima (ΔEA) value for Co(II) complexes were ranged 1.88-3.33 eV. The Edge width of three different complexes of cobalt [Co(II)] synthesized with ligands of nitroaniline dithocarbamate ranged 11.04-12.95 eV. The bond length calculated by LSS method ranged 1.64-2.30 Å for different complexes whereas the bond length calculated by FT method ranged 1.14-2.33 Å. The Lytle’s method and Levy’s method gives the bond length ranged 2.00-2.98 Å and 3.22-3.31 Å, respectively for studied complexes.