ChemInform Abstract: PHOTOREDUKTION VON NITROVERBINDUNGEN 3. MITT. BEZIEHUNGEN ZWISCHEN DER ENERGIE DES UNTEREN TRIPLET‐NIVEAUS UND DEN POLAROGRAPHISCHEN POTENTIALEN DER EINELEKTRONEN‐REDUKTION AROMATISCHER NITROVERBINDUNGEN

Electron Transfer from Triethylamine to the Triplet State of Dinitronaphthalenes, 4,4‘-Dinitrobiphenyl and 2,7-Dinitrofluorenone: Time Resolved UV−Vis Spectroscopic and Conductometric Study in Polar Solvents

“…The observed triplet state is quenched by oxygen, the rate constant for quenching is k ox = (1−2) × 10 9 M -1 s -1 . Some properties of the triplet state of mono- and dinitronaphthalenes have been reported. , The triplet energy ranges from E T = 190 kJ mol -1 for DNF to 210 kJ mol -1 for 1,4-DNN and further to 240 kJ mol -1 for DNB. , The quantum yield of triplet formation of the dinitroarenes is substantial in solution at room temperature, Φ isc = 0.6−0.8 for 1,3- and 1,4-DNN, and in glassy media at −196 °C. , The quantum yield of singlet oxygen formation (Φ Δ ) as lower limit of Φ isc and further triplet state characteristics are compiled in Table . Φ isc = 0.7 for DNB in methanol has been concluded from results of photoreduction in the presence of MeO - …”

“…22,26 The triplet energy ranges from E T ) 190 kJ mol -1 for DNF to 210 kJ mol -1 for 1,4-DNN and further to 240 kJ mol -1 for DNB. 16,22 The quantum yield of triplet formation of the dinitroarenes is substantial in solution at room temperature, Φ isc ) 0.6-0.8 for 1,3-and 1,4-DNN, and in glassy media at -196 °C. 16,23 The quantum yield of singlet oxygen formation (Φ ∆ ) as lower limit of Φ isc and further triplet state characteristics are compiled in Table 1.…”

“…16,22 The quantum yield of triplet formation of the dinitroarenes is substantial in solution at room temperature, Φ isc ) 0.6-0.8 for 1,3-and 1,4-DNN, and in glassy media at -196 °C. 16,23 The quantum yield of singlet oxygen formation (Φ ∆ ) as lower limit of Φ isc and further triplet state characteristics are compiled in Table 1. Φ isc ) 0.7 for DNB in methanol has been concluded from results of photoreduction in the presence of MeO -.…”

“…The photoreduction of aromatic compounds by aliphatic amines has been intensively investigated. − Considerable emphasis has been placed on the photoreduction of nitroaromatic compounds. − The photochemistry of 1-methoxy-4-nitronaphthalene depends on the amine and the amount of water in acetonitrile . A related topic is the photoreduction of nitronaphthalenes in the presence of alcohols. , The major photoproduct of 1,5-dinitronaphthalene (1,5-DNN) in alkaline methanol−water (95:5) is 1-amino-5-nitronaphthalene .…”

“…[1][2][3][4][5][6][7][8][9][10] Considerable emphasis has been placed on the photoreduction of nitroaromatic compounds. [11][12][13][14][15][16][17][18][19][20][21][22][23][24] The photochemistry of 1-methoxy-4-nitronaphthalene depends on the amine and the amount of water in acetonitrile. 18 A related topic is the photoreduction of nitronaphthalenes in the presence of alcohols.…”