Long-lived light-induced metastable states in trans-[Ru(NH 3)4(H2O)NO]Cl3· H 2O and related compounds

Abstract

The existence of two light-induced long-lived metastable states SI, SII in irradiated trans-[Ru(NH3)4(H2O)NO]Cl 3 · H2O and trans-[Ru(NH3) 4(OH)NO]Cl2 is revealed by differential scanning calorimetry measurements and calculations based on density functional theory. Irradiation with light in the blue spectral range leads to the population of SI, while SII can be obtained by transferring SI into SII with irradiation of light in the near infrared spectral range. The population and transfer of the metastable states is described by exponential functions and the thermal decays are evaluated according to Arrhenius' law, yielding activation energies of EA(SI) = 0.95(3) eV, EA(SII) = 0.69(3) eV and f..