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The triplet excited states of A1 and A2 were characterized by a strong absorption band with <jats:italic>\u03bb<\/jats:italic><jats:sub>max<\/jats:sub>\u00a0=\u00a0440\u00a0nm and lifetimes of 20 and 27\u00a0\u03bcs respectively. In the presence of tertiary amines, both triplet excited states were quenched with rate constants close to the diffusional limit (<jats:italic>k<\/jats:italic><jats:sub>q<\/jats:sub> ranged between 10<jats:sup>9<\/jats:sup> and 10<jats:sup>10<\/jats:sup>\u00a0M<jats:sup>\u22121<\/jats:sup>\u00a0s<jats:sup>\u22121<\/jats:sup>). The transient absorption spectra observed after quenching with DABCO and TMP were characterized by maxima located at 460\u00a0nm and broad shoulders in the range of 500\u2013600\u00a0nm. These transient species are attributed to solvent\u2010separated radical ion pairs and\/or to isolated radical anions. In the presence of TEA, these transients undergo proton transfer, leading to the neutral hydrogenated radicals, protonated over the N1\u2010 and O\u2010atoms. Transient absorption spectra of these transients were characterized by maxima located at 400 and 520\u00a0nm and 430\u00a0nm respectively. Additional support for these spectral assignments was provided by pulse radiolysis (PR) experiments in acetonitrile and 2\u2010propanol solutions.<\/jats:p>","DOI":"10.1111\/php.12087","type":"journal-article","created":{"date-parts":[[2013,5,4]],"date-time":"2013-05-04T03:43:58Z","timestamp":1367639038000},"page":"1417-1426","source":"Crossref","is-referenced-by-count":1,"title":["Photoreduction of Azaoxoisoaporphines by Amines: Laser Flash and Steady\u2010State Photolysis and Pulse Radiolysis Studies"],"prefix":"10.1111","volume":"89","author":[{"given":"Julio R.","family":"de la Fuente","sequence":"first","affiliation":[{"name":"Departamento de Qu\u00edmica Org\u00e1nica y Fisicoqu\u00edmica Facultad de Ciencias Qu\u00edmicas y Farmac\u00e9uticas Universidad de Chile Santiago Chile"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Christian","family":"Aliaga","sequence":"additional","affiliation":[{"name":"Departamento de Qu\u00edmica Org\u00e1nica y Fisicoqu\u00edmica Facultad de Ciencias Qu\u00edmicas y Farmac\u00e9uticas Universidad de Chile Santiago Chile"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alvaro","family":"Ca\u00f1ete","sequence":"additional","affiliation":[{"name":"Departamento de Qu\u00edmica Org\u00e1nica Facultad de Qu\u00edmica Pontificia Universidad Cat\u00f3lica de Chile Chile"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gabriel","family":"Kciuk","sequence":"additional","affiliation":[{"name":"Institute of Nuclear Chemistry and Technology Warsaw Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tomasz","family":"Szreder","sequence":"additional","affiliation":[{"name":"Institute of Nuclear Chemistry and Technology Warsaw Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Krzysztof","family":"Bobrowski","sequence":"additional","affiliation":[{"name":"Institute of Nuclear Chemistry and Technology Warsaw Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2013,6,10]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1021\/np020324w"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0031-9422(99)00330-1"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1021\/np000532t"},{"key":"e_1_2_7_5_1","doi-asserted-by":"publisher","DOI":"10.1021\/ar0402863"},{"key":"e_1_2_7_6_1","doi-asserted-by":"publisher","DOI":"10.1562\/2005-04-07-RA-479"},{"key":"e_1_2_7_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/1010-6030(93)03746-4"},{"key":"e_1_2_7_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/1010-6030(96)04321-3"},{"key":"e_1_2_7_9_1","doi-asserted-by":"publisher","DOI":"10.1039\/b401294a"},{"key":"e_1_2_7_10_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1751-1097.2005.tb01530.x"},{"key":"e_1_2_7_11_1","doi-asserted-by":"publisher","DOI":"10.1021\/np100370g"},{"key":"e_1_2_7_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.bmcl.2012.10.092"},{"key":"e_1_2_7_13_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ejmech.2011.09.045"},{"key":"e_1_2_7_14_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0968-0896(01)00358-3"},{"key":"e_1_2_7_15_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.bmc.2005.03.033"},{"key":"e_1_2_7_16_1","doi-asserted-by":"publisher","DOI":"10.1021\/jm00053a005"},{"key":"e_1_2_7_17_1","doi-asserted-by":"publisher","DOI":"10.1021\/jm980682p"},{"key":"e_1_2_7_18_1","doi-asserted-by":"publisher","DOI":"10.1023\/B:RUJO.0000044557.95160.e5"},{"key":"e_1_2_7_19_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ejmech.2007.07.004"},{"key":"e_1_2_7_20_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.bmcl.2007.04.015"},{"key":"e_1_2_7_21_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jphotochem.2011.07.011"},{"key":"e_1_2_7_22_1","doi-asserted-by":"publisher","DOI":"10.1021\/jo050796q"},{"key":"e_1_2_7_23_1","doi-asserted-by":"publisher","DOI":"10.1021\/jp050604v"},{"key":"e_1_2_7_24_1","doi-asserted-by":"publisher","DOI":"10.1039\/b310696a"},{"key":"e_1_2_7_25_1","doi-asserted-by":"publisher","DOI":"10.1021\/jp901877q"},{"key":"e_1_2_7_26_1","doi-asserted-by":"publisher","DOI":"10.1021\/jm010041l"},{"key":"e_1_2_7_27_1","doi-asserted-by":"publisher","DOI":"10.1021\/jp804470c"},{"key":"e_1_2_7_28_1","unstructured":"De laFuente J. 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