Solvent dependence of the steady-state rate of 1O2 generation upon excitation of dissolved oxygen by cw 1267 nm laser radiation in air-saturated solutions: Estimates of the absorbance and molar absorption coefficients of oxygen at the excitation wave

The rates of oxygenation of the 1O2 trap, 1,3-diphenylisobenzofuran were measured in air-saturated organic solvents and heterogeneous D2O-sodium dodecyl sulfate dispersions upon infrared (1267 ± 4 nm) laser irradiation. The absorbance and molar absorption coefficients of oxygen corresponding to this wavelength were estimated from the observed oxygenation rates. The data suggest that 1O2 was formed due to direct oxygen excitation without appreciable involvement of vibrationally excited solvent molecules. The minor ‘pseudophase’ of detergent micelles was shown to strongly enhance overall 1O2 production in D2O-detergent dispersions.