Infrared spectra of B(OMe)3, ClB(OMe)2 and Cl2BOMe species,isolated CH stretching frequencies and bond strengths |
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| Institution: | 1. School of Materials Science and Engineering, Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Tianjin University, and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300350, China;2. Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China;3. State Key Laboratory of New Textile Materials and Advanced Processing Technologies, Wuhan Textile University, Wuhan 430200, China;4. Beijing Advanced Innovation Center for Soft Matter Science and Engineering & State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China;5. Hubei Longzhong Laboratory, Xiangyang 441000, China;1. Department of Physics, Govt.college of Technology, Coimbatore, 641013, India;2. Department of Physics, Sri Krishna College of Technology, Coimbatore, 641042, India;1. Maj Institute of Pharmacology, Polish Academy of Sciences, Department of Behavioral Neuroscience and Drug Development, Krakow, Poland;2. Maj Institute of Pharmacology, Polish Academy of Sciences, Department of Pharmacology, Krakow, Poland |
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| Abstract: | Infrared spectra in the gas phase are reported over the range 3100-500 cm−1 for species of B(OMe)3, ClB(OMe)2 and Cl2BOMe, with CH3, CD3 and CHD2 substitution. A detailed analysis of νCH and νCD data in all three species of Cl2BOMe yields strong evidence for the presence of three kinds of CH bond, two of them weak and one of them strong. The methyl group is then twisted, probably through 10–20°, out of the eclipsed or staggered conformation. The CHD2 spectra of the di and trimethoxy compounds are less susceptible to analysis, but suggest also the presence of two weak and strong bonds, the former increasing in weakness as the number of methoxy groups increases. This is as expected from the increased competition likely between the lone pair electrons for the empty boron orbital. The spectra of the CD3 species permit a clear assignment of νBO, δsCH3, δsCD3 and δasCD3 modes. In Cl(COCH3)2, νsBO lies at 1278 cm−1. |
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