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- W2059796798 abstract "CHEMISTRYA long-standing puzzle in photochemistry has been the nature of the fluorescence from p -dimethylaminobenzonitrile and numerous related compounds in polar solvents. In 1962, Lippert reported two emission peaks for this compound: the expected vertically excited state and an anomalous red-shifted feature. In Grabowski's twisted internal charge transfer model, the red-shifted peak originates from a charge-transfer state in which the amino group twists to stabilize a positive charge. Direct verification for this structural change has been elusive. Dobkowski et al . have prepared a less symmetric analog that shows syn-anti isomerization and anomalous emission when photoexcited at low temperatures (-90°C) in methanol, but no isomerization and only normal emission when the experiment was repeated in nonpolar tetrahydrofuran. The structural assignments were made by nuclear magnetic resonance. — PDS J. Am. Chem. Soc ., 10.1021/ja012326t (2002)." @default.
- W2059796798 created "2016-06-24" @default.
- W2059796798 date "2002-03-08" @default.
- W2059796798 modified "2023-10-18" @default.
- W2059796798 title "Still Twisted After All These Years" @default.
- W2059796798 doi "https://doi.org/10.1126/science.295.5561.1797b" @default.
- W2059796798 hasPublicationYear "2002" @default.
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