Abstract
Abstract The metal electron delocalization caused by ligands in 3 d complexes may be evaluated by means of the empirical equation β =1- t M h L where t M and h L are constants depending on metal ion and ligand types, respectively. t M and h L are till now derived by UV-VIS absorption spectroscopy. By applying a completely different approach, i.e. the correlation found between β and the rate constants of the ortho - into para -positronium spin conversion reactions, the t M value of Cr II was determined and that of Ni II checked.
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