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Jabłoński M, Krygowski TM. Changes in Electron Structure of the Triple Bond in Substituted Acetylene and Diacetylene Derivatives. Chemphyschem 2020; 21:1847-1857. [PMID: 32511830 DOI: 10.1002/cphc.202000378] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Revised: 06/05/2020] [Indexed: 11/06/2022]
Abstract
The substituent effect is usually considered by means of various Hammett-like substituent constants and is most often related to aromatic systems. Unlike this, we present results of our research on the influence of 27 substituents spanning a wide range of electronic properties, from strongly electron-withdrawing to strongly electron-donating, on the electron structure of X-substituted acetylenes and diacetylenes - thus the systems which until now have practically not been subject of any deeper studies. It is shown that the interaction through triple bond(s) is associated with a significant advantage of resonance effects and that the substituent effect transmitted by the C≡C-C≡C unit is about half of that transmitted by the C≡C unit alone. Substituent X mainly affects the closest carbon atom by means of proximity effect, hence changes of charge on this atom do not follow any substituent constants. The effect on further carbon atoms is much smaller. The presence of the C≡C-C≡C unit withdraws more charge from X than a triple bond alone, and hinders communication between X and the terminal H atom. Comparison of substituent effects to those present in X-substituted benzene derivatives shows that the electronic properties of the terminal hydrogen atom in acetylenes and diacetylenes are most similar to the electronic properties of ortho and para hydrogen atoms in X-substituted benzene derivatives.
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Affiliation(s)
- Mirosław Jabłoński
- Faculty of Chemistry, Nicolaus Copernicus University in Toruń, Gagarina 7, 87-100, Toruń, Poland
| | - Tadeusz M Krygowski
- Department of Chemistry, Warsaw University, Pasteura 1, 02-093, Warsaw, Poland
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Meixner P, Batke K, Fischer A, Schmitz D, Eickerling G, Kalter M, Ruhland K, Eichele K, Barquera-Lozada JE, Casati NPM, Montisci F, Macchi P, Scherer W. J(Si,H) Coupling Constants of Activated Si–H Bonds. J Phys Chem A 2017; 121:7219-7235. [DOI: 10.1021/acs.jpca.7b05830] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Petra Meixner
- Institut
für Physik, Universität Augsburg, Universitätsstraße 1, 86135 Augsburg, Germany
| | - Kilian Batke
- Institut
für Physik, Universität Augsburg, Universitätsstraße 1, 86135 Augsburg, Germany
| | - Andreas Fischer
- Institut
für Physik, Universität Augsburg, Universitätsstraße 1, 86135 Augsburg, Germany
| | - Dominik Schmitz
- Institut
für Physik, Universität Augsburg, Universitätsstraße 1, 86135 Augsburg, Germany
| | - Georg Eickerling
- Institut
für Physik, Universität Augsburg, Universitätsstraße 1, 86135 Augsburg, Germany
| | - Marcel Kalter
- Institut
für Physik, Universität Augsburg, Universitätsstraße 1, 86135 Augsburg, Germany
| | - Klaus Ruhland
- Institut
für Physik, Universität Augsburg, Universitätsstraße 1, 86135 Augsburg, Germany
| | - Klaus Eichele
- Institut
für Anorganische Chemie, Universität Tübingen, Auf
der Morgenstelle 18, 72076 Tübingen, Germany
| | - José E. Barquera-Lozada
- Instituto
de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510 Mexico City, Mexico
| | | | - Fabio Montisci
- Department of Chemistry & Biochemistry, University of Berne, Freiestrasse 3, 3012 Berne, Switzerland
| | - Piero Macchi
- Department of Chemistry & Biochemistry, University of Berne, Freiestrasse 3, 3012 Berne, Switzerland
| | - Wolfgang Scherer
- Institut
für Physik, Universität Augsburg, Universitätsstraße 1, 86135 Augsburg, Germany
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Strength of Si–H ⋯ B charge-inverted hydrogen bonds in 1-silacyclopent-2-enes and 1-silacyclohex-2-enes. Struct Chem 2017. [DOI: 10.1007/s11224-017-0939-6] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Comparative study of geometric and QTAIM-based differences between XH⋯Y intramolecular charge-inverted hydrogen bonds, M1⋯(HX) agostic bonds and M2⋯(η2-XH) σ interactions (X=Si, Ge; Y=Al, Ga; M1=Ti, Co; M2=Mn, Fe, Cr). COMPUT THEOR CHEM 2016. [DOI: 10.1016/j.comptc.2016.09.023] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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