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

Abstract 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) 2 Br 2 , Co(emsc) 2 SO 4 , Co(mchsc) 2 Br 2 , Co(mchsc) 2 SO 4 and Co(mchsc) 2 (NCS) 2 . The chemical shifts for these samples have been reported. The total phase shifts δ 1 and phase parameters β 1 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 β 1 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 .