Robert C. Fukuda

Quenching of emission and of photochemistry for aqueous Rh(NH3)5Cl2

Abstract : Aqueous Rh(NH3)5Cl2+ shows emission and excited state absorption, ESA, decaying with the same lifetime. The temperature dependence of emission and of ESA, attributed to the first triplet thexi state, corresponds to an apparent activation energy of 5.4 plus or minus 0.3 kcal/mole. The photochemistry, predominantly chloride aquation, is also quenched. In the case of OH-, results indicate that 85-90% of the photoreaction is quenched on complete emission quenching.

Rate of primary photoproduct formation for aqueous tris(ethylenediamine)chromium(III)

Abstract : The appearance of primary photoproduct is observed by monitoring a solution, following pulse photolysis at 530 nm, using a high energy 20 nsec laser pulse. Sixty percent of the product formation follows the lifetime of the first doublet thexi state; the remaining is prompt and attributed to reaction from the first quartet thexi state. (Author)