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Citation: Tung Cheho*, Zhen Zhen, Liu Jingyao. HYDROPHOBIC EFFECTS ON PHOTOPHYSICAL AND PHOTOCHEMICAL PROCESSES——Ⅷ. AGGREGATION AND FLUORESCENCE SPECTRA OF LONG CHAIN N-ALKYLINDOLES IN POOR SOLVENTS[J]. Acta Physico-Chimica Sinica, ;1989, 5(04): 415-419. doi: 10.3866/PKU.WHXB19890408 shu

HYDROPHOBIC EFFECTS ON PHOTOPHYSICAL AND PHOTOCHEMICAL PROCESSES——Ⅷ. AGGREGATION AND FLUORESCENCE SPECTRA OF LONG CHAIN N-ALKYLINDOLES IN POOR SOLVENTS

1.
Institute of Photographic Chemistry; Academia Sinica; Beijing

Received Date: 7 December 1987
Available Online: 15 August 1989

The fluorescence spectra of N-alkylindoles and 3-methyl-N-alkylindoles with various chain lengths in dimethyl sulfoxide-water(DMSO-H_2O) were studied under stationary and nonstationary condition. As the fraction of water in solvent mixture (Φ) increases, the indoles with short chain display red shifts in fluorescence λ_(max) and increases in fluorescence lifetime. On the contrary, the fluorescence λ_(max) of long chain indoles shift to blue side and their fluorescence lifetimes decrease with increasing in Φ. This observation supports intermolecular aggregation of long chain indoles in poor solvents, The microscopic polarity in aggregates is similar to that in cyclohexane. The distribution of indoles between bulk solution and aggregates was determined by time resolved fluorescence technique.
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