高等学校化学学报

高等学校化学学报 ›› 2000, Vol. 21 ›› Issue (S1): 238.

• Chemistry in Materials Sciences • 上一篇    下一篇

Internal Conversion with N,N-substituted 1-aminonaphthalenes:Photophysics and Applications

SUN Xiang-Yin, WEN Zheng-Chang, JIANG Yun-Bao   

  1. Department of Chemistry and the MOE Key Laboratory of Analytical Sciences, Xiamen University, Xiamen 361005
  • 出版日期:2000-12-31 发布日期:2000-12-31
  • 基金资助:

    This project was supported by the Ministry of Education, China, through a grant for the excellent young scholars.

Internal Conversion with N,N-substituted 1-aminonaphthalenes:Photophysics and Applications

SUN Xiang-Yin, WEN Zheng-Chang, JIANG Yun-Bao   

  1. Department of Chemistry and the MOE Key Laboratory of Analytical Sciences, Xiamen University, Xiamen 361005
  • Online:2000-12-31 Published:2000-12-31
  • Supported by:

    This project was supported by the Ministry of Education, China, through a grant for the excellent young scholars.

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摘要：

The solvent polarity dependence of the fluorescence quantum yield and lifetime of 1-dimethylaminonaphthalene (DMAN) was fund different from that of normal case in that the two parameters increase with increasing solvent polarity, in spite of the fact that the emissive state of DMAN was also of ICT character. Steady state and time-resolved fluorescence studies have currently indicated that a thermally activated internal conversion (IC) occurred with DMAN[1,2]. The IC was assumed to be the consequence, of the vibronic coupling of the emissive S1 state and S2 state with the activation energy of the IC process depending on the energy gap between S1 and S2 states. It was hence put, forward that with increasing solvent, polarity the energy of the S1 state would be lowered more than that of the S2 state, leading to higher energy gap between the S1 and S2 states and therefore suppressed IC. As a consequence, increased fluorescence quantum yield and lengthened lifetime were observed.

Abstract:

The solvent polarity dependence of the fluorescence quantum yield and lifetime of 1-dimethylaminonaphthalene (DMAN) was fund different from that of normal case in that the two parameters increase with increasing solvent polarity, in spite of the fact that the emissive state of DMAN was also of ICT character. Steady state and time-resolved fluorescence studies have currently indicated that a thermally activated internal conversion (IC) occurred with DMAN[1,2]. The IC was assumed to be the consequence, of the vibronic coupling of the emissive S1 state and S2 state with the activation energy of the IC process depending on the energy gap between S1 and S2 states. It was hence put, forward that with increasing solvent, polarity the energy of the S1 state would be lowered more than that of the S2 state, leading to higher energy gap between the S1 and S2 states and therefore suppressed IC. As a consequence, increased fluorescence quantum yield and lengthened lifetime were observed.

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