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Denisova AV, Tibbelin J, Emanuelsson R, Ottosson H. A Computational Investigation of the Substituent Effects on Geometric, Electronic, and Optical Properties of Siloles and 1,4-Disilacyclohexa-2,5-dienes. Molecules 2017; 22:E370. [PMID: 28264524 PMCID: PMC6155320 DOI: 10.3390/molecules22030370] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Revised: 02/16/2017] [Accepted: 02/20/2017] [Indexed: 11/17/2022] Open
Abstract
Thirty two differently substituted siloles 1a-1p and 1,4-disilacyclohexa-2,5-dienes 2a-2p were investigated by quantum chemical calculations using the PBE0 hybrid density functional theory (DFT) method. The substituents included σ-electron donating and withdrawing, as well as π-electron donating and withdrawing groups, and their effects when placed at the Si atom(s) or at the C atoms were examined. Focus was placed on geometries, frontier orbital energies and the energies of the first allowed electronic excitations. We analyzed the variation in energies between the orbitals which correspond to HOMO and LUMO for the two parent species, here represented as ΔεHL, motivated by the fact that the first allowed transitions involve excitation between these orbitals. Even though ΔεHL and the excitation energies are lower for siloles than for 1,4-disilacyclohexa-2,5-dienes the latter display significantly larger variations with substitution. The ΔεHL of the siloles vary within 4.57-5.35 eV (ΔΔεHL = 0.78 eV) while for the 1,4-disilacyclohexa-2,5-dienes the range is 5.49-7.15 eV (ΔΔεHL = 1.66 eV). The excitation energy of the first allowed transitions display a moderate variation for siloles (3.60-4.41 eV) whereas the variation for 1,4-disilacyclohexa-2,5-dienes is nearly doubled (4.69-6.21 eV). Cyclobutadisiloles combine the characteristics of siloles and 1,4-disilacyclohexa-2,5-diene by having even lower excitation energies than siloles yet also extensive variation in excitation energies to substitution of 1,4-disilacyclohexa-2,5-dienes (3.47-4.77 eV, variation of 1.30 eV).
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Affiliation(s)
- Aleksandra V Denisova
- Department of Chemistry-Ångström Laboratory, Uppsala University, Box 523, 75120 Uppsala, Sweden.
| | - Julius Tibbelin
- Department of Chemistry-BMC, Uppsala University, Box 576, 75123 Uppsala, Sweden.
| | - Rikard Emanuelsson
- Nanotechnology and Functional Materials, Department of Engineering Sciences, Uppsala University, Box 534, 75121 Uppsala, Sweden.
| | - Henrik Ottosson
- Department of Chemistry-Ångström Laboratory, Uppsala University, Box 523, 75120 Uppsala, Sweden.
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Samuelsson J, Arnell R, Diesen JS, Tibbelin J, Paptchikhine A, Fornstedt T, Sjöberg PJR. Development of the Tracer-Pulse Method for Adsorption Studies of Analyte Mixtures in Liquid Chromatography Utilizing Mass Spectrometric Detection. Anal Chem 2008; 80:2105-12. [DOI: 10.1021/ac702399a] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jörgen Samuelsson
- Department of Physical and Analytical Chemistry, Uppsala University, BMC, Box 577, SE-751 23 Uppsala, Sweden, AstraZeneca Process R&D, SE-151 85, Södertälje, Sweden, Department of Biochemistry and Organic Chemistry, Uppsala University, BMC, Box 576, SE-751 23 Uppsala Sweden, and Department of Physical and Analytical Chemistry, Uppsala University, BMC, Box 599, SE-751 24 Uppsala, Sweden
| | - Robert Arnell
- Department of Physical and Analytical Chemistry, Uppsala University, BMC, Box 577, SE-751 23 Uppsala, Sweden, AstraZeneca Process R&D, SE-151 85, Södertälje, Sweden, Department of Biochemistry and Organic Chemistry, Uppsala University, BMC, Box 576, SE-751 23 Uppsala Sweden, and Department of Physical and Analytical Chemistry, Uppsala University, BMC, Box 599, SE-751 24 Uppsala, Sweden
| | - Jarle S. Diesen
- Department of Physical and Analytical Chemistry, Uppsala University, BMC, Box 577, SE-751 23 Uppsala, Sweden, AstraZeneca Process R&D, SE-151 85, Södertälje, Sweden, Department of Biochemistry and Organic Chemistry, Uppsala University, BMC, Box 576, SE-751 23 Uppsala Sweden, and Department of Physical and Analytical Chemistry, Uppsala University, BMC, Box 599, SE-751 24 Uppsala, Sweden
| | - Julius Tibbelin
- Department of Physical and Analytical Chemistry, Uppsala University, BMC, Box 577, SE-751 23 Uppsala, Sweden, AstraZeneca Process R&D, SE-151 85, Södertälje, Sweden, Department of Biochemistry and Organic Chemistry, Uppsala University, BMC, Box 576, SE-751 23 Uppsala Sweden, and Department of Physical and Analytical Chemistry, Uppsala University, BMC, Box 599, SE-751 24 Uppsala, Sweden
| | - Alexander Paptchikhine
- Department of Physical and Analytical Chemistry, Uppsala University, BMC, Box 577, SE-751 23 Uppsala, Sweden, AstraZeneca Process R&D, SE-151 85, Södertälje, Sweden, Department of Biochemistry and Organic Chemistry, Uppsala University, BMC, Box 576, SE-751 23 Uppsala Sweden, and Department of Physical and Analytical Chemistry, Uppsala University, BMC, Box 599, SE-751 24 Uppsala, Sweden
| | - Torgny Fornstedt
- Department of Physical and Analytical Chemistry, Uppsala University, BMC, Box 577, SE-751 23 Uppsala, Sweden, AstraZeneca Process R&D, SE-151 85, Södertälje, Sweden, Department of Biochemistry and Organic Chemistry, Uppsala University, BMC, Box 576, SE-751 23 Uppsala Sweden, and Department of Physical and Analytical Chemistry, Uppsala University, BMC, Box 599, SE-751 24 Uppsala, Sweden
| | - Per J. R. Sjöberg
- Department of Physical and Analytical Chemistry, Uppsala University, BMC, Box 577, SE-751 23 Uppsala, Sweden, AstraZeneca Process R&D, SE-151 85, Södertälje, Sweden, Department of Biochemistry and Organic Chemistry, Uppsala University, BMC, Box 576, SE-751 23 Uppsala Sweden, and Department of Physical and Analytical Chemistry, Uppsala University, BMC, Box 599, SE-751 24 Uppsala, Sweden
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