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

Oxygenation of 1,3-diphenylisobenzofuran was studied in air-saturated solvents upon excitation of dissolved oxygen by infrared (1270 nm) laser radiation: O2[3Σg-(v=0)]+hν1270→1O2[1Δg(v=0)]1O2 + Trap → oxygenation The molar absorption coefficients (ε1270) of oxygen were calculated from the observed oxygenation rates. The obtained ε1270 were compared with the rate constants of the 1O2 radiative transition in the same media and the absorbance of the solvents at 1270 nm.