Solvent-induced deactivation of singlet oxygen: additivity relationships in nonaromatic solvents

The Synthesis and Singlet Oxygen Generation Study of 13(1)-N-Piperazinyl Chlorin e6-15(2),17(3)-Dimethyl Ester

“…Its lifetime is found to be equal to 19±1 μs. This value is in good agreement with the 1 O 2 lifetime determined by Rodgers, [24] and it is also nearly identical to some other organic solvents in absence of any singlet oxygen quenchers. [25] The 1 O 2 quantum yield (γ Δ ) has been determined by comparing the initial intensities of 1 O 2 luminescence in solutions of compound 1 and palladium mesoporphyrin IX dimethyl ester (PdMP) at A 337 =0.77.…”

Heterogeneous degradation of refractory pollutants by peroxymonosulfate activated by CoOx-doped ordered mesoporous carbon

“…It had been reported that 1 O 2 can selectively oxidize electron-rich compounds (i.e., phenol, sulfide and amine), but showed nearly no reactivity toward saturated alcohol (i.e., MeOH, EtOH and TBA) [54,55]. Results showed that the inhibition of phenol degradation by p-BQ (a scavenger for O 2…”

Photochemistry and Spectroscopy of Singlet Oxygen in Solvents. Recent Advances which Support the Old Theory

“…On the basis of the Mulliken's prediction [7] [2,[13][14][15][16][17][18][19][20]. The stationary concentration of singlet O 2 * in solvents is very low as well as intensity of the a→X emission; thus, a highly sensitive cooled photomultiplier (FEU-83) [13][14][15][16][17][18] or Ge-photodiode are necessary for its detection [25][26][27][28][29][30][31][32]. The low radiative rate constant (k r ) for 1270 nm a→X emission at low pressure in gases [21] and its essential enhancement in solvents [15,18] have been explained in a number of old papers [10,22,23].…”

“…The low radiative rate constant (k r ) for 1270 nm a→X emission at low pressure in gases [21] and its essential enhancement in solvents [15,18] have been explained in a number of old papers [10,22,23]. Nowadays the total theoretical backgrounds of this theory are supported by numerous experimental studies [26][27][28][29][30][31][32] including recent experiments [33][34][35][36][37][38] on direct oxygen excitation. Thus, it can be interesting to present a short review of such backgrounds accounting a great importance of singlet oxygen photochemistry in solvents for modern medical diagnostics and therapy [39,40] as well as for some braches of chemical technology [5,32].…”