Nephelauxetic series of Ln(III) compounds: Racah parameters for Ln3+ ions determined from tetrad effects of standard-state enthalpy data for Ln(III) compound series and RSPET equation.

Abstract

Lanthanide tetrad effects are seen in the standard-state enthalpy data for a variety of Ln(III) compound or complex series. The tetrad effects can be inverted into the relative values of Racah (E1 and E3) parameters on the basis of RSPET equation. Systematic decrease of Racah parameters (the nephelauxetic series) determined from the thermochemical data is compatible with the spectroscopic results.