X-RAY-ABSORPTION FINE-STRUCTURE STUDIES OF SOME COBALT(II) COMPLEXES

X-ray absorption fine structure studies of some cobalt(II) complexes w ere carried oat using a Seifert x-ray generator and Cauchois-type bent crystal x-ray spectrograph of 0.4 m radius. It was found that the gra phical method originally proposed by Lytle et al. gives useful informa tion about the bond length and also the environment of the absorbing a tom. The phase parameters of the first coordination shell, alpha(1) an d B-1, provide valuable information about the forward- and back-scatte ring atoms, respectively. The total phase shift delta(1) gives an idea of the periodicity of the x-ray absorption fine structure. It was als o found that the periodicity is affected by the presence of different ligands in the studied cobalt(II) complexes.