X-ray K-absorption studies of cobalt(II) semicarbazones

X-ray K-absorption edges along with their extended X-ray absorption fine structure (EXAFS) have been recorded using a laboratory XAFS spectrometer for the cobalt(II) semicarbazones viz., Co(emsc)2Br2, Co(emsc)2SO4, Co(mchsc)2Br2, Co(mchsc)2SO4 and Co(mchsc)2(NCS)2. The chemical shifts for these samples have been reported. The total phase shifts δ1 and phase parameters β1 for these samples have been estimated using the modified graphical method for the determination of bond distances. The variations in the values of chemical shift, phase parameter β1 and average metal–ligand bond distances have been explained. The total phase shift values for the complexes indicate a linear variation with wave vector k.