Secondary fluorescences of 4'-(1-pyrenyl)acetophenone and p-dimethylaminoacetophenone |
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| Institution: | 1. Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warszawa, Poland;2. Iwan N. Stranski-Institute for Physical and Theoretical Chemistry, Technical University of Berlin, 1000 Berlin, Fed. Rep. Germany;3. Centre de Physique Moléculaire Optique et Hertzienne, Université de Bordeaux I, 33405 Talence, France;1. Department of Chemistry, Karunya Institute of Technology and Sciences (Deemed-to-be University), Karunya Nagar, Coimbatore 641 114, India;2. Department of Biotechnology, Karunya Institute of Technology and Sciences (Deemed-to-be University), Karunya Nagar, Coimbatore 641 114, India;3. Department of Microbiology, Bharathidasan University, Tiruchirappalli 620 024, India;1. School of Materials Science and Engineering, University of Jinan, Jinan, Shandong 250022, China;2. State Key Laboratory of Crystal Materials, Shandong University, Jinan, Shandong 250100, China;1. Oakland University William Beaumont School of Medicine, Rochester, MI, USA;2. Department of Plastic Surgery, Rutgers New Jersey School of Medicine, Newark, NJ, USA;1. Department of Chemistry, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, 576104, Karnataka, India;2. Department of Physics, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, 576104, Karnataka, India;3. Optoelectronics Laboratory, Department of Physics, National Institute of Technology Karnataka, Surathkal, 575025, Karnataka, India;4. Department of Atomic and Molecular Physics, Manipal Academy of Higher Education, Manipal, 576104, Karnataka, India;5. Department of Chemical Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, 576104, Karnataka, India;6. Department of Nano Science and Engineering, Indian Institute of Science, Bengaluru, 560012, Karnataka, India |
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| Abstract: | 4'-(1-Pyrenyl)acetophenone (PYRA) and p-dimethylaminoacetophenone (DMAA) were investigated in nonpolar and polar protic and aprotic solvents over a wide temperature range. Quantum chemical (INDO/S) calculations of the energies of electronic transitions, oscillator strengths and dipole moments were performed for planar and twisted conformations of both compounds. For DMAA, the experimental results are well explained in terms of the TICT state. In the case of PYRA in polar aprotic solvents, two alternative models are discussed: TICT state formation or inversion of the two low lying singlet states. |
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