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Jabri A, Marshall FE, Tonks WRN, Brenner RE, Gillcrist DJ, Wurrey CJ, Kleiner I, Guirgis GA, Grubbs GS. The Conformational Landscape, Internal Rotation, and Structure of 1,3,5-Trisilapentane using Broadband Rotational Spectroscopy and Quantum Chemical Calculations. J Phys Chem A 2020; 124:3825-3835. [PMID: 32323989 DOI: 10.1021/acs.jpca.0c01100] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The rotational spectrum of 1,3,5-trisilapentane was observed on a chirped-pulse Fourier transform microwave spectrometer and is reported. During assignment, multiple conformations of the molecule were identified in the molecular beam. Prior quantum-chemical calculations performed on the molecule show that the identified spectra correspond to the lowest three calculated energetic structures. These structures are of C2 (Conf.1), C2v (Conf.2), and C1 (Conf.3) symmetry, with relative energy ordering of Conf.1 < Conf.3 < Conf.2, which is in stark contrast to n-pentane and all known silicon-substituted n-pentane derivatives. This is found to most likely arise from the elongation of the Si-C bond and the size of the silicon atoms providing for the C2 and C1 structures relieving steric hindrance in comparison to that of the C2v. In the C2v and C1 conformers, splitting in the spectra due to internal rotation of the -SiH3 end groups of 1,3,5-trisilapentane was observed and determined. The C2v equivalent V3 values are 368.46(33) cm-1, and the C1V3 values are 347.78(21) and 360.18(88) cm-1, respectively. These barriers are compared to similar species in order to help verify their veracity and are determined to be accurate based on similar molecular silyl rotors.
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Affiliation(s)
- Atef Jabri
- Laboratoire Interuniversitaire des Systèmes Atmosphériques, CNRS UMR 7583, Université Paris-Est Créteil & Université de Paris, Institut Pierre Simon Laplace, 61 avenue du Général de Gaulle, Créteil cedex F-94010, France
| | - Frank E Marshall
- Department of Chemistry, Missouri University of Science and Technology, 400 W. 11th Street, Rolla, Missouri 65409, United States
| | - William Raymond Neal Tonks
- Department of Chemistry and Biochemistry, College of Charleston, 66 George Street, Charleston, South Carolina 29424, United States
| | - Reid E Brenner
- Department of Chemistry, University of Missouri-Kansas City, 5007 Rockhill Road, Kansas City, Missouri 64110, United States
| | - David J Gillcrist
- Department of Chemistry, Missouri University of Science and Technology, 400 W. 11th Street, Rolla, Missouri 65409, United States
| | - Charles J Wurrey
- Department of Chemistry, University of Missouri-Kansas City, 5007 Rockhill Road, Kansas City, Missouri 64110, United States
| | - Isabelle Kleiner
- Laboratoire Interuniversitaire des Systèmes Atmosphériques, CNRS UMR 7583, Université Paris-Est Créteil & Université de Paris, Institut Pierre Simon Laplace, 61 avenue du Général de Gaulle, Créteil cedex F-94010, France
| | - Gamil A Guirgis
- Department of Chemistry and Biochemistry, College of Charleston, 66 George Street, Charleston, South Carolina 29424, United States
| | - G S Grubbs
- Department of Chemistry, Missouri University of Science and Technology, 400 W. 11th Street, Rolla, Missouri 65409, United States
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Guirgis GA, Sawant DK, Brenner RE, Deodhar BS, Seifert NA, Geboes Y, Pate BH, Herrebout WA, Hickman DV, Durig JR. Microwave, r0 Structural Parameters, Conformational Stability, and Vibrational Assignment of (Chloromethyl)fluorosilane. J Phys Chem A 2015; 119:11532-47. [DOI: 10.1021/acs.jpca.5b06679] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Gamil A. Guirgis
- Department
of Chemistry and Biochemistry, College of Charleston, Charleston, South Carolina 29424, United States
| | - Dattatray K. Sawant
- Department
of Chemistry, University of Missouri-Kansas City, Kansas City, Missouri 64110, United States
| | - Reid E. Brenner
- Department
of Chemistry, University of Missouri-Kansas City, Kansas City, Missouri 64110, United States
| | - Bhushan S. Deodhar
- Department
of Chemistry, University of Missouri-Kansas City, Kansas City, Missouri 64110, United States
| | - Nathan A. Seifert
- Department
of Chemistry, University of Virginia, Charlottesville, Virginia 22904, United States
| | - Yannick Geboes
- Department
of Chemistry, Universitair Centrum Antwerpen, 171 Groenenborglaan, Antwerpen 2020, Belgium
| | - Brooks H. Pate
- Department
of Chemistry, University of Virginia, Charlottesville, Virginia 22904, United States
| | - Wouter A. Herrebout
- Department
of Chemistry, Universitair Centrum Antwerpen, 171 Groenenborglaan, Antwerpen 2020, Belgium
| | - Daniel V. Hickman
- Department
of Chemistry and Biochemistry, College of Charleston, Charleston, South Carolina 29424, United States
| | - James R. Durig
- Department
of Chemistry, University of Missouri-Kansas City, Kansas City, Missouri 64110, United States
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Seifert NA, Guirgis GA, Pate BH. The molecular structure of methyl(difluoro)silyl chloride as determined by broadband microwave spectroscopy. J Mol Struct 2012. [DOI: 10.1016/j.molstruc.2012.04.078] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Møllendal H, Samdal S, Guirgis GA, Wurrey CJ. Microwave and quantum chemical study of allyldifluorosilane (H(2)C=CHCH(2)SiF(2)H). J Phys Chem A 2010; 114:6608-12. [PMID: 20504033 DOI: 10.1021/jp101950z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The microwave spectrum of allyldifluorosilane (H(2)C=CHCH(2)SiF(2)H) has been investigated for the first time in the 28-80 GHz spectral interval at a temperature of -30 degrees C. The spectrum of the ground vibrational state of one conformer characterized by an anticlinal orientation for the C=C-C-Si chain of atoms and a synclinal conformation for the C-C-Si-H link has been assigned. This rotamer was found to be at least 2 kJ/mol more stable than further rotameric forms. The spectroscopic investigation has been augmented with quantum chemical calculations employing the MP2 and B3LYP methods using the 6-311++G(3df,3pd) basis set. The theoretical predictions are generally in good agreement with the experimental results.
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Affiliation(s)
- Harald Møllendal
- Centre for Theoretical and Computational Chemistry (CTCC), Department of Chemistry, University of Oslo, P.O. Box 1033 Blindern, NO-0315 Oslo, Norway.
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