Environmental effects on the absorption and luminescence properties of aromatic amines: Aniline |
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| Institution: | 1. Department of Chemistry, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, 45137-66731, Iran;2. Center of Climate Change and Global Warming, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, 45137-66731, Iran;3. Department of Chemistry, Dalhousie University, P.O. Box 15000, Halifax, Nova Scotia, B3H 4R2, Canada;1. Department of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou, Henan, 450001, People’s Republic of China;2. Department of Medicine, Huanghe University of Science and Technology, Zhengzhou, Henan, 450000, People’s Republic of China;3. Zhengzhou Kingmed Diagnostics, Zhengzhou, Henan, 450016, People’s Republic of China;1. CNRS UMR 6200, MOLTECH-Anjou, University of Angers, 2 Bd Lavoisier, 49045, Angers, France;2. Department of Chemistry, University of Calgary, 2500 University Drive N.W., Calgary, Alberta, T2N 1N4, Canada;1. School of Environmental Science and Engineering, Chang’an University, Xi’an 710064, China;2. Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of Ministry of Education, Chang’an University, No. 126 Yanta Road, Yanta District, Xi’an 710064, China;3. College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China;4. Center for Food Quality Supervision, Inspection & Testing, Ministry of Agriculture, Northwest A&F University, Yangling 712100, China;5. Department of Agricultural Chemistry, Qingdao Agricultural University, Qingdao 266109, China;1. Department of Chemistry, Andhra Loyola College, Vijayawada, Andhra Pradesh 520 008, India;2. Department of Physics, P B Siddartha College of Arts and Science, Vijayawada, Andhra Pradesh 520 008, India;3. Department of Chemistry, GITAM University, Visakhapatnam, Andhra Pradesh 530 045, India;4. Indian Institute of Petroleum, Dehradun 248 005, India;5. Department of Physics, Andhra Loyola College, Vijayawada, Andhra Pradesh 520 008, India;1. Light Technology Institute, Karlsruhe Institute of Technology (KIT), Engesserstrasse 13, 76131, Karlsruhe, Germany;2. Institute of Organic Chemistry, Heidelberg University, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany |
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| Abstract: | Emission and absorption spectra of aniline have been studied in different solvents at 300 K and 77 K. This molecule exhibits broad and structureless fluorescence and poorly resolved phosphorescence in glassy polar ethanol and non-polar methylcyclohexane and n-hexane matrices at 77 K. Unlike the behaviour in a polar medium, fluorescence is found to be more intense than phosphorescence in non-polar media. In contrast to the case of glassy matrices, aniline shows highly stuctured emission and excitation spectra in crystalline cyclohexane and benzene matrices at 77 K. Excited state dipole moment calculation shows that both the singlet states contain charge transfer character, which is responsible for the strong phosphorescence in polar glassy medium. Spectral analysis indicates that the aniline molecule is slightly distorted in both the singlet and triplet states. The marked reduction in phosphorescence intensity of this molecule observed in non-polar matrices, particularly in a benzene crystalline matrix, relative to that in an ethanol matrix, is attributable to the decreased intersystem crossing rate and increased non-radiative rate from the emitting triplet state. |
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