Optical absorption study of Rh(III)- and Ir(III)-doped NaCl single crystals (NaCl:M3+, MRh3+, Ir3+)—A crystal field analysis

• Published in: Journal of alloys and compounds Vol. 259; no. 1-2; pp. 153 - 157
• Main Authors: Gilliams, Ben, Heerman, Luc, Görller-Walrand, Christiane
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 22.08.1997
• Subjects: Iridium(III); Metal-ligand distance; Rhodium(III); Metal-ligand distance; Iridium(III); Rhodium(III)
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/S0925-8388(97)00042-X

This work reports an optical absorption study of a rhodium(III)-doped and an iridium(III)-doped sodium chloride single crystal. A crystal field calculation including spin-orbit coupling is used to fit the observed levels. The results were compared with literature data for rhodium(III) and iridium(III) in several other matrices. This comparison indicates that a qualitative correlation exists between the semi-empirical crystal field parameters for these octahedral complexes and the transition metal-ligand distances in the different hosts. Thus, an increase of the metal-ligand distance leads to a smaller nephelauxetic effect and a smaller value of the 10 Dq parameter.