Excited state dipole moments of fluoroanilines from solvatochromic shift measurements |
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| Institution: | 1. Department of Chemistry, University of South Florida, 4202 E. Fowler Avenue, Tampa, FL 33620, USA;2. Key Lab of Applied Chemistry of Zhejiang Province and Department of Chemistry, Zhejiang University, Hangzhou 310028, China;1. School of Chemistry and Environmental Engineering, Key Laboratory for Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Wuhan, 430074, China;2. School of Materials Science and Engineering, Zhejiang Sci Tech University, Hangzhou, 310018, China;3. School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan, 430074, China;1. Key Laboratory of Luminescence Analysis and Molecular Sensing, Ministry of Education, School of Materials and Energy, Southwest University, Chongqing 400715, PR China;2. College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Normal University, Jinan 250014, PR China;3. Analytical and Testing Center, Southwest University, Chongqing 400715, PR China;4. Hangzhou Yanqu Information Technology Co., Ltd., Hangzhou 310003, PR China;5. CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, PR China;6. Department of Joint Surgery, Center for Orthopaedic Surgery, The Third Affiliated Hospital of Southern Medical University, Orthopedic Hospital of Guangdong Province, Guangzhou, Guangdong, PR China;1. Department of Chemistry, College of Science, Imam Abdulrahman bin Faisal University, Dammam 31113, Saudi Arabia;2. Department of Chemistry and Biochemistry, University of Montana, Missoula, MT, 59812, USA;3. Department of Chemistry, Ivane Javakhishvili Tbilisi State University, 1, I. Chavchavadze ave., 0128, Tbilisi, Georgia;4. La.M.I. and LaSCAMM, INSTM Sezione Basilicata, Dipartimento di Scienze, Universita della Basilicata, Via dell''Ateneo Lucano 10, 85100, Potenza, Italy |
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| Abstract: | The dipole moments of fluorinated anilines in the first excited singlet state (1Lb) have been determined from the solvent shifts of absorption and fluorescence spectra. It is concluded that in the monofluoro isomers as well as in aniline itself this dipole moment must be of the order of 5 debye, whereas the gas phase dipole moment is estimated to be some 2 debye only from Stark effect measurements. Ortho-substituted difluoro- and trifluoroanilines show anomalous Stokes shifts of the absorption and fluorescence spectra which are indicative of substantial reorganization of their nuclear framework in the excited state; in these cases no excited state dipole moment could be determined. |
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