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• W2150842195 endingPage "8215" @default.
• W2150842195 startingPage "8208" @default.
• W2150842195 abstract "The photoreduction of 6-nitrospiro[2H-1-benzopyran-2,2′-indoline] (N1) and two derivatives (N2 and N3) by diethylamine or triethylamine (TEA) in solution was studied by pulsed and steady-state photolysis. The quantum yield of coloration of the ring-closed Sp form, due to photoinduced ring opening, decreases in acetonitrile with increasing the TEA concentration. The main reason is reaction of TEA with the triplet-excited open merocyanine form. Quenching of this triplet state by amines is rather inefficient for N1–N3; the rate constant for triplet quenching by TEA is k6 = (2–3) × 106 M–1 s–1. The secondary transient with an absorption maximum at 420 nm is ascribed to the radical anion. This and the corresponding α-aminoethyl radical subsequently undergo slow termination reactions, yielding a relatively stable product with a maximum at 420–450 nm, which is attributed to a ring-opened dihydromerocyanine (MH–). The mechanisms of the two subsequent reduction reactions are discussed. Using acetone as sensitizer the same dihydroproduct was obtained with the Sp form as acceptor, indicating a reaction sequence from photogenerated radicals via a ring-opened radical to MH–/MH2. The effect of TEA concentration on the direct and ketone-sensitized reduction mechanisms was analyzed. Photoreduction by amines, due to competing triplet quenching, is strongly decreased on admission of oxygen." @default.
• W2150842195 created "2016-06-24" @default.
• W2150842195 creator A5036773492 @default.
• W2150842195 date "2011-06-30" @default.
• W2150842195 modified "2023-09-24" @default.
• W2150842195 title "Direct Photoreduction and Ketone-Sensitized Reduction of Nitrospirobenzopyranindolines by Aliphatic Amines" @default.
• W2150842195 cites W1964406205 @default.
• W2150842195 cites W1967528382 @default.
• W2150842195 cites W1968246590 @default.
• W2150842195 cites W1974205519 @default.
• W2150842195 cites W1976591924 @default.
• W2150842195 cites W1979508837 @default.
• W2150842195 cites W1980428456 @default.
• W2150842195 cites W1985632474 @default.
• W2150842195 cites W1986403725 @default.
• W2150842195 cites W1990636137 @default.
• W2150842195 cites W1990923987 @default.
• W2150842195 cites W1996142594 @default.
• W2150842195 cites W1997341367 @default.
• W2150842195 cites W1998299226 @default.
• W2150842195 cites W1999151947 @default.
• W2150842195 cites W1999386022 @default.
• W2150842195 cites W2002455520 @default.
• W2150842195 cites W2004054787 @default.
• W2150842195 cites W2005510441 @default.
• W2150842195 cites W2006856603 @default.
• W2150842195 cites W2008637159 @default.
• W2150842195 cites W2013180536 @default.
• W2150842195 cites W2014136875 @default.
• W2150842195 cites W2014942595 @default.
• W2150842195 cites W2016684549 @default.
• W2150842195 cites W2017506349 @default.
• W2150842195 cites W2020924317 @default.
• W2150842195 cites W2021154566 @default.
• W2150842195 cites W2024112558 @default.
• W2150842195 cites W2026981113 @default.
• W2150842195 cites W2028774711 @default.
• W2150842195 cites W2029122710 @default.
• W2150842195 cites W2030131311 @default.
• W2150842195 cites W2031446233 @default.
• W2150842195 cites W2032224943 @default.
• W2150842195 cites W2034078979 @default.
• W2150842195 cites W2034925608 @default.
• W2150842195 cites W2035777114 @default.
• W2150842195 cites W2035843358 @default.
• W2150842195 cites W2044918489 @default.
• W2150842195 cites W2045507692 @default.
• W2150842195 cites W2046104463 @default.
• W2150842195 cites W2046600214 @default.
• W2150842195 cites W2046792324 @default.
• W2150842195 cites W2050312026 @default.
• W2150842195 cites W2051429183 @default.
• W2150842195 cites W2053087501 @default.
• W2150842195 cites W2054800487 @default.
• W2150842195 cites W2055099628 @default.
• W2150842195 cites W2059383689 @default.
• W2150842195 cites W2060739515 @default.
• W2150842195 cites W2061521762 @default.
• W2150842195 cites W2064931390 @default.
• W2150842195 cites W2066098918 @default.
• W2150842195 cites W2066198398 @default.
• W2150842195 cites W2070696701 @default.
• W2150842195 cites W2074264305 @default.
• W2150842195 cites W2074570987 @default.
• W2150842195 cites W2074949979 @default.
• W2150842195 cites W2075802651 @default.
• W2150842195 cites W2076133840 @default.
• W2150842195 cites W2076218761 @default.
• W2150842195 cites W2079623819 @default.
• W2150842195 cites W2080154950 @default.
• W2150842195 cites W2081117928 @default.
• W2150842195 cites W2085605599 @default.
• W2150842195 cites W2086007950 @default.
• W2150842195 cites W2086146728 @default.
• W2150842195 cites W2086262225 @default.
• W2150842195 cites W2089939750 @default.
• W2150842195 cites W2090269016 @default.
• W2150842195 cites W2090497423 @default.
• W2150842195 cites W2093224375 @default.
• W2150842195 cites W2098523750 @default.
• W2150842195 cites W2100819289 @default.
• W2150842195 cites W2113543035 @default.
• W2150842195 cites W2145773666 @default.
• W2150842195 cites W2147579106 @default.
• W2150842195 cites W2153216927 @default.
• W2150842195 cites W2158400313 @default.
• W2150842195 cites W2177309150 @default.
• W2150842195 cites W2329164735 @default.
• W2150842195 cites W2333155750 @default.
• W2150842195 cites W2492889264 @default.
• W2150842195 cites W2949091862 @default.
• W2150842195 cites W2951571990 @default.
• W2150842195 cites W83570268 @default.
• W2150842195 doi "https://doi.org/10.1021/jp2005698" @default.
• W2150842195 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/21688834" @default.
• W2150842195 hasPublicationYear "2011" @default.
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