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Lee NK, Park S, Yoon MH, Kim ZH, Kim SK. Effect of ring torsion on intramolecular vibrational redistribution dynamics of 1,1'-binaphthyl and 2,2'-binaphthyl. Phys Chem Chem Phys 2012; 14:840-8. [PMID: 22124335 DOI: 10.1039/c1cp22854d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The role of ring torsion in the enhancement of intramolecular vibrational energy redistribution (IVR) in aromatic molecules was investigated by conducting excitation and dispersed fluorescence spectroscopy of 1,1'-binaphthyl (1,1'-BN) and 2,2'-BN. The dispersed fluorescence spectra of 1,1'-BN in the origin region of S(1)-S(0) were well resolved, which presented 25-27 cm(-1) gaps of torsional mode in the ground state. The overall profile of the dispersed spectra of 1,1'-BN is similar to that of naphthalene. In contrast, the spectra of 2,2'-BN were not resolved due to the multitude of the active torsional modes. In both cases, dissipative IVR was observed to take place with a relatively small excess vibrational energy: 237.5 cm(-1) for 1,1'-BN and 658 cm(-1) for 2,2'-BN, which clearly shows that ring torsion efficiently enhances the IVR rate. Ab initio and density functional theory calculations with medium-sized basis sets showed that the torsional potential of 1,1'-BN has a very flat minimum over the range of torsional angles from ca. 60° to 120°, whereas that of 2,2'-BN showed two well-defined potential minima at ca. 40° and 140°, in resemblance to the case of biphenyl. In this work, we propose that aromatic molecules be classified into "strong" and "weak" torsional hindrance cases: molecules with strong hindrance case show shorter torsional progressions and more effective IVR dynamics than do those with weak hindrance.
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Affiliation(s)
- Nam Ki Lee
- Department of Physics and School of Interdisciplinary Bioscience and Bioengineering, Pohang University of Science and Technology, Pohang, Korea.
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Baba M, Mori K, Saito M, Kowaka Y, Noma Y, Kasahara S, Yamanaka T, Okuyama K, Ishimoto T, Nagashima U. CH3 Internal Rotation in the S0 and S1 States of 9-Methylanthracene. J Phys Chem A 2009; 113:2366-71. [DOI: 10.1021/jp808550r] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Masaaki Baba
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan, Molecular Photoscience Research Center, Kobe University, Nada-ku, Kobe 657-8501, Japan, Instrument Center, Institute for Molecular Science, Okazaki 444-8585, Japan, Department of Chemical Engineering and Materials, College of Engineering, Nihon University, Koriyama 963-8642, Japan, Research Institute for Computational Sciences, National Institute of Advanced Industrial Science and Technology, Umezono 1-1-1,
| | - Koichi Mori
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan, Molecular Photoscience Research Center, Kobe University, Nada-ku, Kobe 657-8501, Japan, Instrument Center, Institute for Molecular Science, Okazaki 444-8585, Japan, Department of Chemical Engineering and Materials, College of Engineering, Nihon University, Koriyama 963-8642, Japan, Research Institute for Computational Sciences, National Institute of Advanced Industrial Science and Technology, Umezono 1-1-1,
| | - Motohisa Saito
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan, Molecular Photoscience Research Center, Kobe University, Nada-ku, Kobe 657-8501, Japan, Instrument Center, Institute for Molecular Science, Okazaki 444-8585, Japan, Department of Chemical Engineering and Materials, College of Engineering, Nihon University, Koriyama 963-8642, Japan, Research Institute for Computational Sciences, National Institute of Advanced Industrial Science and Technology, Umezono 1-1-1,
| | - Yasuyuki Kowaka
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan, Molecular Photoscience Research Center, Kobe University, Nada-ku, Kobe 657-8501, Japan, Instrument Center, Institute for Molecular Science, Okazaki 444-8585, Japan, Department of Chemical Engineering and Materials, College of Engineering, Nihon University, Koriyama 963-8642, Japan, Research Institute for Computational Sciences, National Institute of Advanced Industrial Science and Technology, Umezono 1-1-1,
| | - Yuki Noma
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan, Molecular Photoscience Research Center, Kobe University, Nada-ku, Kobe 657-8501, Japan, Instrument Center, Institute for Molecular Science, Okazaki 444-8585, Japan, Department of Chemical Engineering and Materials, College of Engineering, Nihon University, Koriyama 963-8642, Japan, Research Institute for Computational Sciences, National Institute of Advanced Industrial Science and Technology, Umezono 1-1-1,
| | - Shunji Kasahara
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan, Molecular Photoscience Research Center, Kobe University, Nada-ku, Kobe 657-8501, Japan, Instrument Center, Institute for Molecular Science, Okazaki 444-8585, Japan, Department of Chemical Engineering and Materials, College of Engineering, Nihon University, Koriyama 963-8642, Japan, Research Institute for Computational Sciences, National Institute of Advanced Industrial Science and Technology, Umezono 1-1-1,
| | - Takaya Yamanaka
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan, Molecular Photoscience Research Center, Kobe University, Nada-ku, Kobe 657-8501, Japan, Instrument Center, Institute for Molecular Science, Okazaki 444-8585, Japan, Department of Chemical Engineering and Materials, College of Engineering, Nihon University, Koriyama 963-8642, Japan, Research Institute for Computational Sciences, National Institute of Advanced Industrial Science and Technology, Umezono 1-1-1,
| | - Katsuhiko Okuyama
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan, Molecular Photoscience Research Center, Kobe University, Nada-ku, Kobe 657-8501, Japan, Instrument Center, Institute for Molecular Science, Okazaki 444-8585, Japan, Department of Chemical Engineering and Materials, College of Engineering, Nihon University, Koriyama 963-8642, Japan, Research Institute for Computational Sciences, National Institute of Advanced Industrial Science and Technology, Umezono 1-1-1,
| | - Takayoshi Ishimoto
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan, Molecular Photoscience Research Center, Kobe University, Nada-ku, Kobe 657-8501, Japan, Instrument Center, Institute for Molecular Science, Okazaki 444-8585, Japan, Department of Chemical Engineering and Materials, College of Engineering, Nihon University, Koriyama 963-8642, Japan, Research Institute for Computational Sciences, National Institute of Advanced Industrial Science and Technology, Umezono 1-1-1,
| | - Umpei Nagashima
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan, Molecular Photoscience Research Center, Kobe University, Nada-ku, Kobe 657-8501, Japan, Instrument Center, Institute for Molecular Science, Okazaki 444-8585, Japan, Department of Chemical Engineering and Materials, College of Engineering, Nihon University, Koriyama 963-8642, Japan, Research Institute for Computational Sciences, National Institute of Advanced Industrial Science and Technology, Umezono 1-1-1,
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