Spectroscopy,photophysics and photochemistry of 1,3-diketoboronates: IV: Luminescence spectroscopic investigations of 2-naphthyl-substituted 1,3-diketoboronates |
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| Institution: | 1. Área Académica de Química, Universidad Autónoma del Estado de Hidalgo, Carretera Pachuca-Tulancingo Km 4.5, Ciudad Universitaria, 42184, Mineral de la Reforma, Hidalgo, Mexico;2. Departamento de Química Orgánica, Facultad de Química, Universidad Nacional Autónoma de México, Circuito Escolar, Ciudad Universitaria, 04510, Ciudad de México, Mexico;3. Departamento de Química de Radiaciones y Radioquímica, Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, 04510, Ciudad de México, Mexico;4. Departamento de Química, Centro de Investigación y de Estudios Avanzados del IPN, México, Ciudad de México, Apdo. Postal 14-740, 07000, Mexico;1. Department of Organic Chemistry, Faculty of Chemistry, University of Łódź, Tamka 12, 91-403 Łódź, Poland;2. PPSM, ENS Cachan, CNRS, UniverSud, 61 Av President Wilson, 94230 Cachan, France;3. University of Warsaw, Biological and Chemical Research Center, Żwirki i Wigury 101, 02-089 Warszawa, Poland;1. Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China;2. University of Chinese Academy of Sciences, Beijing, 100049, China;1. Institute of Physics, Prospect Nauki, 46, Kyiv-28, 03028, Ukraine;2. V.P. Kukhar Institute of Bioorganic Chemistry and Petrochemistry, Murmanskaya Street, 1, Kyiv, 02660, Ukraine;3. Institute of Organic Chemistry, Murmanskaya Street, 5, Kyiv, 02660, Ukraine;4. Department of Chemistry and Environmental Science, College of Science and Liberal Arts, New Jersey Institute of Technology, 323 Martin Luther King, Jr. Boulevard, Newark, NJ, 07102, USA;1. Optoelectronic Laboratory, Department of Chemistry, National Institute of Technology Rourkela, India;2. Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan;1. Department of Engineering Science, Graduate School of Informatics and Engineering, The University of Electro-Communications, Chofu, Tokyo 182-8585, Japan;2. Division of Molecular Science, Graduate School of Science and Engineering, Gunma University, Kiryu, Gunma 376-8515, Japan |
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| Abstract: | Aryl-substituted 1,3-diketoboronates exhibit high fluorescence quantum yields. In the case of 2-naphthyl-substituted 1,3-diketoboronates, excitation-wavelength-dependent luminescence spectra and luminescence-wavelength-dependent excitation spectra were recorded. In polar solvents the compounds exhibit large Stokes shifts and the fluorescence lifetimes depend on the excitation and fluorescence wavelengths. The multiple fluorescence behaviour is interpreted by assuming the existence of excited non-equilibrated rotamers with different photophysical properties and high dipole moments in the excited state. The relaxation of polar solvents around these high polar species contributes to the broadening of the fluorescence bands and to the fluorescence-wavelength dependence of the lifetimes caused by the fluorescence of incompletely solvent-relaxed species. |
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