Trisdipicolinate coordination complexes of europium(m), Eu(dpa)(3)(3-), have chiral, three-bladed propeller-like structures with either left-handed or right-handed structural helicity about a S-fold symmetry axis. The left- and right-handed forms of these structures, labeled here as Lambda and Delta, respectively, are structural enantiomers, and they exhibit characteristic circular dichroic absorption and emission properties in their optical excitation and luminescence spectra. In solution media that contain no other chiral species, the Eu(dpa)(3)(3-) complexes exist as a racemic mixture of interconverting Lambda and Delta enantiomeric structures (optical isomers). This racemic mixture of Lambda- and Delta-Eu(dpa)(3)(3-) complexes exhibits no chiroptical properties; but if it is excited with a pulse of circularly polarized light, partially resolved ground- and excited-state populations of Lambda and Delta enantiomers are created, and these populations exhibit chiroptical properties reflective of their enantiomeric compositions (defined in terms of enantiomeric excess quantities). In this study, time-resolved chiroptical luminescence (TR-CL) measurements are used to monitor changes in excited-state enantiomeric excess as a function of time after circularly polarized excitation, and the rate parameters derived from these measurements are related to the rate constants of Lambda reversible arrow Delta processes. Measurements are performed over a range of sample temperatures, and the temperature-dependent rate data are analyzed in terms of Arrhenius and Eyring activation models. Results are reported for solution samples prepared in six different solvent media : H2O, D2O, an ethylene glycol-H2O mixture, CH3OH, C2H5OH, and CH3CN. These results show a significant solvent dependence both in the rates, of h Lambda reversible arrow Delta enantiomer interconversion processes and in the thermal activation energies determined for these processes.