The deactivation of the upper excited singlet oxygen O-2((1)Sigma(g)(+)) by 22 different quenchers has been studied in the liquid phase by time-resolved emission experiments. Radiationless deactivation occurs by electronic to vibrational (e-v) energy transfer to terminal bonds X-Y of the quenching molecule. A model is presented which describes the broad variation of rate constants over 4 orders of magnitude. The quantitative comparison with the e-v deactivation of O-2((1)Delta(g)) demonstrates that for O-2((1)Sigma(g)(+)) in addition to the excitation of stretching modes the excitation of bending modes of X-Y becomes important for the overall deactivation process.