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Lone pair covalent effective charge

Two mechanisms contribute to the decrease of Racah B parameters. First, lone pairs of electrons from the ligand may penetrate the 3d shell of the transition metal and screen its 3d electrons from the nucleus, thereby decreasing the effective nuclear charge experienced by the electrons and expanding the 3d shell. This mechanism is termed central field covalency. In the second mechanism, referred to as symmetry restricted covalency, delocalization of the trans-... [Pg.433]

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