EFFECT OF COUNTER IONS ON THE X-RAY-ABSORPTION DISCONTINUITY IN SOLIDCOMPLEXES

The results presented in this paper indicate that the counter ion dist ant neighbours affect the X-ray absorption discontinuity. Copper (II) complexes in the solid state with ethylenediamine (en) containing diff erent counter ions (chloride, nitrate, sulphate ions) have been used a s models for this purpose. The effect of the behaviour of counter ions on X-ray absorption provides very fruitful information regarding the influence of counter ion distant neighbours on X-ray absorption spectr a. The results have been interpreted on the basis of electronegativity and provide X-ray evidence for the nephelauxetic effect discovered by Jorgensen on the basis of optical spectra.