Excited-state absorption of meso-tetrasulfonatophenyl porphyrin: Effects of pH and micelles |
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| Affiliation: | 1. EMBRAPA Instrumentação, Rua XV de Novembro, 1452, CP 741, 13560-970 São Carlos, SP, Brazil;2. Instituto de Física de São Carlos, Universidade de São Paulo, Caixa Postal 369, 13560-970 São Carlos, SP, Brazil;3. Departamento de Física, FFCLRP, Universidade de São Paulo, Av. Bandeirantes 3900, 14040-901 Ribeirão Preto, SP, Brazil;4. Instituto de Física, Universidade Federal de Uberlândia, Av. João Naves de Ávilla, 2121, Bloco 1X, 38.400-902 Uberlândia, MG, Brazil;5. Programa de Pós-graduação em Física, Universidade Federal do Pará, P.O. Box 479, 66075-110 Belém, PA, Brazil;6. Instituto de Física, Universidade Federal de Goiás, Caixa Postal 131, 74001-970 Goiânia, GO, Brazil;1. G.G. Devyatykh Institute of Chemistry of High-Purity Substances of the Russian Academy of Sciences, 49 Tropinin Str., Nizhny Novgorod 603950, Russia;2. N.I. Lobachevski Nizhny Novgorod State University, 23 Gagarin Avenue, Nizhny Novgorod 603950, Russia;1. School of Energy Science and Engineering, University of Electronic Science and Technology of China, 2006 Xiyuan Road, Chengdu, PR China;2. School of Materials and Chemical Engineering, Anhui Jianzhu University, Hefei, PR China;3. Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, PR China;1. National Institute for Laser, Plasma and Radiation Physics, Laboratory of Solid-State Quantum Electronics, Bucharest R-077125, Romania;2. Doctoral School of Physics, Faculty of Physics, University of Bucharest, Bucharest, Romania;1. State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences (CAS), Xi’an 710119, People’s Republic of China;2. Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, People’s Republic of China;3. Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Shaanxi Key Lab of Information Photonic Technique, School of Electronics & Information Engineering, Xi’an Jiaotong University, Xi’an 710049, People’s Republic of China;1. Saint-Petersburg Institute of Technology, Moskovsky prospect, 26, 190013 Saint-Petersburg, Russian Federation;2. Showa Denko K.K., Japan;3. Research Institute of Electronics, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu 432-8011, Japan |
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| Abstract: | The influence of the environment on the excited state transitions of meso-tetrakis(p-sulfonatophenyl) porphyrin (TPPS) is reported. TPPS was investigated in protonated and non-protonated forms, and in the presence of the cationic cetyltrimethylammonium bromide (CTAB) micelles. The singlet excited-state absorption spectra were measured by using the white-light continuum Z-scan technique and the triplet–triplet absorption spectra were acquired employing an association of laser flash photolysis and Z-scan techniques. Our results show that the perseveration of the molecular symmetry, upon excitation, depends on the state of multiplicity of the molecules, as well as on the environment and structural characteristics of the porphyrin. Additionally, it was observed that for excited molecules, the ring distortion caused by the protonation of porphyrin ring has great influence on the changes observed for the symmetry and vibronic structure. The results clearly show that the porphyrin investigated is a promising candidate for optical limiting applications for all investigated environments. |
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| Keywords: | Molecular symmetry Protonation Z-scan Laser flash photolysis Excited state absorption Optical limiting |
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