Redox-chemiluminescence of the Eu3+* ion and Xe* atom generated in the solid-phase interaction of EuSO4 and ХеF2

Abstract

The new chemiluminescence (CL) in solid-phase interaction of powders EuSO4 (or Eu2(SO4)3) with ХеF2 at room temperature was found. The CL for EuSO4 is studied in more detail and is the first example of the oxidation of the Ln2+ ions by ХеF2 and the solid-phase CL of the divalent lanthanide ions. The CL and IR spectra as well the photoluminescence (PL) emission and excitation spectra and also the lifetimes of the excited Eu2+* and Eu3+* ions in the starting EuSO4 and in the solid reaction product FEuSO4 have been measured for the first time. The second stable product of the reaction Xe atoms has been identified by gas chromatography-mass spectrometry (GC–MS). The Eu3+* ions are a dominant emitters of the CL (~ 90% of the total emission) and emit the red light (λmax = ~ 608 and ~ 705nm) and the second weak CL emitters are Xe* atoms (λmax = 475nm). Possible mechanism generation of new direct and indirect CL in the interaction of EuSO4 with ХеF2 has been proposed in the paper.