D. Schaniel, T. Woike, C. Boskovic and H.-U. Güdel
Evidence for two light-induced metastable states in Cl3[Ru(NH3)5NO]H2O
Chem. Phys. Lett. 390, 347-351 (2004)
Abstract:
Differential Scanning Calorimetry measurements on irradiated
Cl3[Ru(NH3)5NO]H2O reveal the
existence of two light-induced long-lived metastable states SI, SII. Irradiation
with light in the spectral range 400–500 nm leads to the excitation of SI. For
the first time we report experimental evidence for the state SII in this
compound, which can be excited by transferring SI into SII with irradiation of
light in the spectral range 1000–1200 nm. The excitation and transfer of the
metastable states is described and the exponential decays are evaluated
according to Arrhenius' law yielding activation energies of
EA(SI)=0.73(3) eV, EA(SII)=0.66(3) eV and
frequency factors of Z(SI)=1 × 1012 s−1,
Z(SII) = 5 × 1012 s−1.