Interaction between intramolecular charge transfer state of p-N,N-dimethylaminobenzonitrile and amines. Stereo-controlled fluorescence quenching
✍ Scribed by Ying Wang
- Publisher
- Elsevier Science
- Year
- 1985
- Tongue
- English
- Weight
- 631 KB
- Volume
- 116
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
The first excited singlet state, an intramofecular charge transfer state, of p-N,N-dimethylaminohenzonitrile (DhWBN) is quenched by tertiary amines. The quenching rate cannot be correlated with the oxidation potential of the amines, but is conrrolled by the size of the amme alkyl group. This unusual steric effect indicates a short-range interaction, which we attribute to three-electron bonding. Excited-state three-electron bonding interaction should be a general phenomenon and can lead to the formation of sigma-bonded excipIexes. The implication of this result on the origin of the anomalous dual fluorescence of DMABN is discussed.