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Pshenichnyuk SA, Rakhmeyev RG, Asfandiarov NL, Komolov AS, Modelli A, Jones D. Can the Electron-Accepting Properties of Odorants Be Involved in Their Recognition by the Olfactory System? J Phys Chem Lett 2018; 9:2320-2325. [PMID: 29665679 DOI: 10.1021/acs.jpclett.8b00704] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The present study examines the possible importance of the electron-accepting properties of odorant molecules and, in particular, the formation and decay of temporary negative ions via low-energy electron attachment as a possible contribution toward understanding odorant recognition by olfactory receptors (ORs). Fragments formed by dissociative electron attachment (DEA) of mustard oil odorants represented by a series of isothiocyanates are studied experimentally using DEA spectroscopy and DFT calculations. Relative intensities for the most abundant fragment species, S- and SCN-, are found to be characteristic of structurally similar odorants under investigation. This novel approach for the investigation of odorants may contribute to understanding the initial stages of the olfactory process and may provide a means to distinguish between odorants and their interactions with the olfactory receptor system.
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Affiliation(s)
- Stanislav A Pshenichnyuk
- Institute of Molecule and Crystal Physics, Ufa Federal Research Centre , Russian Academy of Sciences , Prospeκt Oktyabrya 151 , 450075 Ufa , Russia
| | - Rustam G Rakhmeyev
- Institute of Molecule and Crystal Physics, Ufa Federal Research Centre , Russian Academy of Sciences , Prospeκt Oktyabrya 151 , 450075 Ufa , Russia
| | - Nail L Asfandiarov
- Institute of Molecule and Crystal Physics, Ufa Federal Research Centre , Russian Academy of Sciences , Prospeκt Oktyabrya 151 , 450075 Ufa , Russia
| | - Alexei S Komolov
- St. Petersburg State University , Universitetskaya nab. 7/9 , 199034 St. Petersburg , Russia
| | - Alberto Modelli
- Dipartimento di Chimica "G. Ciamician" , Università di Bologna , via Selmi 2 , 40126 Bologna , Italy
- Centro Interdipartimentale di Ricerca in Scienze Ambientali , via S. Alberto 163 , 48123 Ravenna , Italy
| | - Derek Jones
- ISOF, Istituto per la Sintesi Organica e la Fotoreattività, C.N.R. , via Gobetti 101 , 40129 Bologna , Italy
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Pshenichnyuk SA, Modelli A, Komolov AS. Interconnections between dissociative electron attachment and electron-driven biological processes. INT REV PHYS CHEM 2018. [DOI: 10.1080/0144235x.2018.1461347] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Stanislav A. Pshenichnyuk
- Institute of Molecule and Crystal Physics – Subdivision of the Ufa Research Centre of the Russian Academy of Sciences, Ufa, Russia
| | - Alberto Modelli
- Dipartimento di Chimica ‘G. Ciamician’, Università di Bologna, Bologna, Italy
- Centro Interdipartimentale di Ricerca in Scienze Ambientali, Ravenna, Italy
| | - Alexei S. Komolov
- Department of Solid State Electronics, St. Petersburg State University, St. Petersburg, Russia
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Pshenichnyuk SA, Modelli A, Jones D, Lazneva EF, Komolov AS. Low-Energy Electron Interaction with Melatonin and Related Compounds. J Phys Chem B 2017; 121:3965-3974. [PMID: 28394598 DOI: 10.1021/acs.jpcb.7b01408] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The electron attaching properties and fragmentation of temporary negative ions of melatonin and its biosynthetic precursor tryptophan are studied in vacuo using dissociative electron attachment (DEA) spectroscopy. The experimental findings are interpreted in silico with the support of Hartree-Fock and density functional theory calculations of empty orbital energies and symmetries, and evaluation of the electron affinities of the indolic molecules under investigation. The only fragment anions formed by DEA to melatonin at incident electron energies below 2 eV are associated with the elimination of a hydrogen atom (energetically favored from the NH site of the pyrrole ring, leaving the ring intact) or a CH3· radical from the temporary molecular negative ion. Opening of the pyrrole ring of melatonin is not detected over the whole electron energy range of 0-14 eV. The DEA spectra of l- and d-tryptophan are almost identical under the present experimental conditions. The adiabatic electron affinity of melatonin is predicted to be -0.49 eV at the B3LYP/6-31+G(d) level, indicating that the DEA mechanism in melatonin is likely to be present in most life forms given the availability of low energy electrons in living systems in both plant and animal kingdoms. In particular, H atom donation usually associated with free-radical scavenging activity can be stimulated by electron attachment and N-H bond cleavage at electron energies around 1 eV.
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Affiliation(s)
- Stanislav A Pshenichnyuk
- Institute of Molecule and Crystal Physics, Ufa Research Centre, Russian Academy of Sciences , Prospeκt Oktyabrya 151, 450075 Ufa, Russia.,St. Petersburg State University , Universitetskaya nab. 7/9, 199034 St. Petersburg, Russia
| | - Alberto Modelli
- Dipartimento di Chimica "G. Ciamician″, Università di Bologna , via Selmi 2, 40126 Bologna, Italy.,Centro Interdipartimentale di Ricerca in Scienze Ambientali , via S. Alberto 163, 48123 Ravenna, Italy
| | - Derek Jones
- ISOF, Istituto per la Sintesi Organica e la Fotoreattività , C.N.R., via Gobetti 101, 40129 Bologna, Italy
| | - Eleonora F Lazneva
- St. Petersburg State University , Universitetskaya nab. 7/9, 199034 St. Petersburg, Russia
| | - Alexei S Komolov
- St. Petersburg State University , Universitetskaya nab. 7/9, 199034 St. Petersburg, Russia
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Modelli A, Jones D, Pshenichnyuk SA. Electron attachment to indole and related molecules. J Chem Phys 2013; 139:184305. [DOI: 10.1063/1.4829057] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
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Modelli A, Pshenichnyuk SA. Empty-Level Structure and Reactive Species Produced by Dissociative Electron Attachment to tert-Butyl Peroxybenzoate. J Phys Chem A 2012; 116:3585-92. [DOI: 10.1021/jp300643e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Alberto Modelli
- Dipartimento di Chimica
″G.
Ciamician″, Università di Bologna, via Selmi 2, 40126 Bologna, Italy, and Centro Interdipartimentale di Ricerca in Scienze Ambientali, via S. Alberto 163,
48123 Ravenna, Italy
| | - Stanislav A. Pshenichnyuk
- Institute
of Physics of Molecules
and Crystals, Ufa Research Center of RAS, October Prospect, 151, Ufa 450075, Russia
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Lacaze-Dufaure C, Najjar F, André-Barrès C. First Computational Evidence of a Competitive Stepwise and Concerted Mechanism for the Reduction of Antimalarial Endoperoxides. J Phys Chem B 2010; 114:9848-53. [DOI: 10.1021/jp100718p] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Corinne Lacaze-Dufaure
- Centre Interuniversitaire de Recherche et d’Ingénierie des Matériaux, CNRS UMR 5085, ENSIACET, 4 allée Emile Monso, BP 44362, 31432 Toulouse cedex 04, France, Laboratoire de Synthèse et Physicochimie de Molécules d’Intérêt Biologique, CNRS UMR 5068, Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse, France, and Faculty of Sciences-2, Lebanese University, Jdaidet el-Maten, B.P. 90656, Lebanon
| | - Fadia Najjar
- Centre Interuniversitaire de Recherche et d’Ingénierie des Matériaux, CNRS UMR 5085, ENSIACET, 4 allée Emile Monso, BP 44362, 31432 Toulouse cedex 04, France, Laboratoire de Synthèse et Physicochimie de Molécules d’Intérêt Biologique, CNRS UMR 5068, Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse, France, and Faculty of Sciences-2, Lebanese University, Jdaidet el-Maten, B.P. 90656, Lebanon
| | - Christiane André-Barrès
- Centre Interuniversitaire de Recherche et d’Ingénierie des Matériaux, CNRS UMR 5085, ENSIACET, 4 allée Emile Monso, BP 44362, 31432 Toulouse cedex 04, France, Laboratoire de Synthèse et Physicochimie de Molécules d’Intérêt Biologique, CNRS UMR 5068, Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse, France, and Faculty of Sciences-2, Lebanese University, Jdaidet el-Maten, B.P. 90656, Lebanon
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Puiatti M, Vera DMA, Pierini AB. In search for an optimal methodology to calculate the valence electron affinities of temporary anions. Phys Chem Chem Phys 2009; 11:9013-24. [DOI: 10.1039/b908870a] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Abstract
The experimental and theoretical study of molecular anions has undergone explosive growth over the past 40 years. Advances in techniques used to generate anions in appreciable numbers as well as new ion-storage, ion-optics, and laser spectroscopic tools have been key on the experimental front. Theoretical developments on the electronic structure and molecular dynamics fronts now allow one to achieve higher accuracy and to study electronically metastable states, thus bringing theory in close collaboration with experiment in this field. In this article, many of the experimental and theoretical challenges specific to studying molecular anions are discussed. Results from many research groups on several classes of molecular anions are overviewed, and both literature citations and active (in online html and pdf versions) links to numerous contributing scientists' Web sites are provided. Specific focus is made on the following families of anions: dipole-bound, zwitterion-bound, double-Rydberg, multiply charged, metastable, cluster-based, and biological anions. In discussing each kind of anion, emphasis is placed on the structural, energetic, spectroscopic, and chemical-reactivity characteristics that make these anions novel, interesting, and important.
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Affiliation(s)
- Jack Simons
- Chemistry Department, Henry Eyring Center for Theoretical Chemistry, UniVersity of Utah, Salt Lake City, Utah, USA
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Studies of protonated and anionic artemisinin in the gas-phase by infrared multi-photon dissociation and by negative ion photoelectron spectroscopies. Chem Phys Lett 2007. [DOI: 10.1016/j.cplett.2007.10.086] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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