| 菁染料和份菁染料溶液的光降解机理的研究 |
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| 引用本文： | 杨松杰,孟凡顺,田禾,姚思德.菁染料和份菁染料溶液的光降解机理的研究[J].影像科学与光化学,2001,19(3):169-176. |
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| 作者姓名： | 杨松杰 孟凡顺 田禾 姚思德 |
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| 作者单位： | 1. 华东理工大学精细化工研究所, 上海200237;2. 中国科学院上海原子核研究所辐射化学开放研究实验室, 上海201800 |
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| 摘 要： | 利用UV-Vis吸收光谱仪和光化学反应器,研究了菁染料和份菁染料溶液的光降解动力学,认为染料在乙腈溶液中的光褪色反应服从假一级或零级动力学.利用GC/MS光谱仪检测了染料的光降解产物.与相应的份菁染料相比,携带正电荷的菁染料具有相对较好的光稳定性.研究结果表明,菁染料光降解反应的中间体可能是染料的半氧化态Dye+,并利用纳秒级闪光光解技术研究了Dye+的瞬态吸收光谱.
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| 关 键 词： | 菁染料 光稳定性 份菁染料 闪光光解 |
| 收稿时间： | 2000-10-11 |
STUDY ON THE PHOTODEGRADATION MECHANISM OF CYANINE DYES AND MEROCYANINE DYES SOLUTION |
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| YANG Song-jie,MENG Fan-shun,TIAN He,YAO Si-de.STUDY ON THE PHOTODEGRADATION MECHANISM OF CYANINE DYES AND MEROCYANINE DYES SOLUTION[J].Imaging Science and Photochemistry,2001,19(3):169-176. |
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| Authors: | YANG Song-jie MENG Fan-shun TIAN He YAO Si-de |
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| Institution: | 1. Institute of Fine Chemicals, East China University of Science & Technology, Shanghai 200237, P. R. China;2. The Laboratory of Radiation Chemistry, Shanghai Institute of Nuclear Research, Chinese Academy of Sciences, Shanghai 201800, P. R. China |
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| Abstract: | The photodegradation kinetics of cyanine dyes and merocyanine dyes were studied by UV Vis absorption spectroscopy. The results show that the rate of the photofading reactions of the dyes follow quasi first order or zero order kinetics in acetonitrile. The main photodegradation products of the dyes were identified by GC/MS spectrometry. Those cyanine dyes holding a positive charge have relative good photostability comparing with merocyanines. The experimental results imply that the photodegradation intermediates for the cyanine dyes may be the semi oxide state of dye, Dye +. The transient absorption spectra of Dye + were measured by nanosecond laser flash photolysis. |
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| Keywords: | photodegradation cyanine dyes merocyanine dyes flash photolysis |
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