EPR Spectra of Mn2+in Chloride, Bromide, and Iodide Host Compounds

The EPR spectra have been obtained for Mn2+ fourfold coordinated in Cs2ZnCl4, K2ZnCl4, K2HgCl4, K2ZnBr4, and K2ZnI4; sixfold coordinated in NaCl, and KCl; and eightfold coordinated in CsCl. Large distortions from cubic symmetry were observed in CsCl. Variations in the manganese nuclear hyperfine splitting are discussed in terms of the nature of the ligand, changes in the manganese–ligand separation, and changes in the manganese coordination number. The effects of the changes in the coordination number have not been determined previously because concomitant changes in the internuclear distance usually have an opposite, and frequently larger, effect.