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Zhang H, Krupa J, Wierzejewska M, Biczysko M. The role of dispersion and anharmonic corrections in conformational analysis of flexible molecules: the allyl group rotamerization of matrix isolated safrole. Phys Chem Chem Phys 2019; 21:8352-8364. [PMID: 30958495 DOI: 10.1039/c9cp00926d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Conformational changes of the monomeric safrole (5-(2-propenyl)-1,3-benzodioxole) isolated in low temperature xenon matrices were induced thermally or using narrow-band UV radiation. The rotation of the allyl group taking place in the studied matrices was followed by FTIR spectroscopy. Safrole represents a challenging example of a flexible molecule highlighting the importance of dispersion interactions and anharmonic effects in the structural, spectroscopic and energetic analysis. Structures of the safrole conformers, their energetics and infrared spectra have been calculated using various computational methods ranging from density functional theory (DFT) to coupled cluster (CC). The best theoretical results were obtained by integrating CCSD(T) energies including complete basis set extrapolation and core-valence corrections with B2PLYP-D3 equilibrium structures and hybrid B2PLYP-D3/B3LYP-D3 anharmonic computations for IR spectra and thermodynamics.
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Affiliation(s)
- Hongli Zhang
- International Centre for Quantum and Molecular Structures, Department of Physics, College of Sciences, Shanghai University, 99 Shangda Road, Shanghai, 200444, China.
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Krupa J, Pagacz-Kostrzewa M, Wierzejewska M. UV laser-induced photolysis of matrix isolated o-guaiacol. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.05.098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Menzel JP, Noble BB, Lauer A, Coote ML, Blinco JP, Barner-Kowollik C. Wavelength Dependence of Light-Induced Cycloadditions. J Am Chem Soc 2017; 139:15812-15820. [DOI: 10.1021/jacs.7b08047] [Citation(s) in RCA: 65] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Jan P. Menzel
- School
of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology (QUT), 2 George Street, Brisbane, QLD 4000, Australia
- Macromolecular
Architectures, Institut für Technische Chemie und Polymerchemie, Karlsruhe Institute of Technology (KIT), Engesserstr. 18, 76131 Karlsruhe, Germany
| | - Benjamin B. Noble
- Australian
Research Council Centre of Excellence for Electromaterials Science,
Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia
| | - Andrea Lauer
- School
of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology (QUT), 2 George Street, Brisbane, QLD 4000, Australia
- Macromolecular
Architectures, Institut für Technische Chemie und Polymerchemie, Karlsruhe Institute of Technology (KIT), Engesserstr. 18, 76131 Karlsruhe, Germany
- Institut
für Biologische Grenzflächen, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Michelle L. Coote
- Australian
Research Council Centre of Excellence for Electromaterials Science,
Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia
| | - James P. Blinco
- School
of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology (QUT), 2 George Street, Brisbane, QLD 4000, Australia
| | - Christopher Barner-Kowollik
- School
of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology (QUT), 2 George Street, Brisbane, QLD 4000, Australia
- Macromolecular
Architectures, Institut für Technische Chemie und Polymerchemie, Karlsruhe Institute of Technology (KIT), Engesserstr. 18, 76131 Karlsruhe, Germany
- Institut
für Biologische Grenzflächen, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
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Calabrese C, Gou Q, Maris A, Melandri S, Caminati W. Conformational Equilibrium and Internal Dynamics of E-Anethole: A Rotational Study. J Phys Chem B 2016; 120:6587-91. [PMID: 27341010 DOI: 10.1021/acs.jpcb.6b04883] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The rotational spectra of the two conformers of E-anethole have been investigated using the free jet broadband millimeter-wave spectroscopic technique combined with theoretical calculations. Anti and syn conformers differ for the relative orientation of the propenyl and methoxy chains, with all heavy atoms coplanar to the benzene ring. Relative intensity measurements prove that the anti form is the global minimum, about 2.0(5) kJ mol(-1) lower in energy with respect to the syn conformer, solving the contrasting results supplied by different theoretical methods. For both conformers, the barriers to internal rotation of the propenyl -CH3 group are low enough to generate fully resolved A-E splittings of the rotational transitions. The corresponding V3 barriers have been determined to be 7.080(5) and 6.978(4) kJ mol(-1), respectively.
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Affiliation(s)
- Camilla Calabrese
- Dipartimento di Chimica "G. Ciamician" dell'Università , Via Selmi 2, I-40126 Bologna, Italy
| | - Qian Gou
- Dipartimento di Chimica "G. Ciamician" dell'Università , Via Selmi 2, I-40126 Bologna, Italy
| | - Assimo Maris
- Dipartimento di Chimica "G. Ciamician" dell'Università , Via Selmi 2, I-40126 Bologna, Italy
| | - Sonia Melandri
- Dipartimento di Chimica "G. Ciamician" dell'Università , Via Selmi 2, I-40126 Bologna, Italy
| | - Walther Caminati
- Dipartimento di Chimica "G. Ciamician" dell'Università , Via Selmi 2, I-40126 Bologna, Italy
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Allen AD, Tidwell TT. Structure and Mechanism in Ketene Chemistry. ADVANCES IN PHYSICAL ORGANIC CHEMISTRY 2014. [DOI: 10.1016/b978-0-12-800256-8.00004-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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