Excitation and luminescence spectra of dipotassium hexafluoromanganate(IV)

Abstract

Measurement of the excitation and luminescence spectra of the salt K2[MnF6] prepared by different methods shows that the intense emission observed at low temperatures between 14 700 and 13 500 cm–1 is caused by a MnIV species present as impurity. The 2E state of the impurity is populated by energy transfer from the 2E state of the [MnF6]2– ion thereby almost quenching the emission from the latter. The nature of this impurity is discussed. The previously reported absorption band at 19 300 cm–1 is not present in the excitation spectrum and is attributed to another impurity. All the expected electronic and vibronic origins of the 4A2→2E and 4A2→2T1 transitions of the [MnF6]2– ion have been identified.