1
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Grimm AB, Wang K, Rheingold AL, Moore CE, Szieberth D, Nyulászi L, Protasiewicz JD. 2-Aryl-1,3-Benzoxaphospholes as Unwilling Participants for Catalytic Suzuki–Miyaura CC Coupling Reactions. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00462] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Alexandra B. Grimm
- Department of Chemistry, Case Western Reserve University, Cleveland, Ohio 44106, United States
| | - Kai Wang
- Department of Chemistry, Case Western Reserve University, Cleveland, Ohio 44106, United States
| | - Arnold L. Rheingold
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, United States
| | - Curtis E. Moore
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, United States
| | - Dénes Szieberth
- Department of Inorganic Chemistry, Budapest University of Technology and Economics and MTA-BME Computation Driven Chemistry Research Group H-1521 Budapest, Hungary
| | - László Nyulászi
- Department of Inorganic Chemistry, Budapest University of Technology and Economics and MTA-BME Computation Driven Chemistry Research Group H-1521 Budapest, Hungary
| | - John D. Protasiewicz
- Department of Chemistry, Case Western Reserve University, Cleveland, Ohio 44106, United States
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2
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Pshenichnyuk SA, Modelli A. Electron Attachment to Isolated Molecules as a Probe to Understand Mitochondrial Reductive Processes. Methods Mol Biol 2021; 2277:101-124. [PMID: 34080147 DOI: 10.1007/978-1-0716-1270-5_7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
This chapter describes the complementary experimental techniques Electron Transmission Spectroscopy and Dissociative Electron Attachment Spectroscopy, two of the most suitable means for investigating interactions between electrons and gas-phase molecules, resonance formation of temporary molecular negative ions, and their possible decay through the dissociative electron attachment (DEA) mechanism. The latter can be seen as the gas-phase counterpart of the transfer of a solvated electron in solution, accompanied by dissociation of the molecular anion, referred to as dissociative electron transfer (DET). DET takes place in vivo under reductive conditions, for instance, in the intermembrane space of mitochondria under interaction of xenobiotic molecules possessing high electron affinity with electrons "leaked" from the mitochondrial respiratory chain. A likely mechanism of the toxic activity of dichlorodiphenyltrichloroethane based on its DEA properties is briefly outlined, and compared with the well-established harmful effects of the model toxicant carbon tetrachloride ascribed to reductive dechlorination in a cellular ambient. A possible mechanism of the antioxidant activity of polyphenolic compounds present near the main site of superoxide anion production in mitochondria is also briefly discussed.
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Affiliation(s)
- Stanislav A Pshenichnyuk
- Institute of Molecule and Crystal Physics, Ufa Federal Research Centre, 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
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3
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Giese S, Klimov K, Mikeházi A, Kelemen Z, Frost DS, Steinhauer S, Müller P, Nyulászi L, Müller C. 2‐(Dimethylamino)phosphinin: Ein phosphorhaltiges Anilinderivat. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202014423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Steven Giese
- Freie Universität Berlin Institut für Chemie und Biochemie Fabeckstraße 34/36 14195 Berlin Deutschland
| | - Katrin Klimov
- Freie Universität Berlin Institut für Chemie und Biochemie Fabeckstraße 34/36 14195 Berlin Deutschland
| | - Antal Mikeházi
- Department of Inorganic and Analytical Chemistry Budapest University of Technology and Economics and MTA-BME Computation Driven Chemistry Research Group Szt. Gellért tér 4 1111 Budapest Ungarn
| | - Zsolt Kelemen
- Department of Inorganic and Analytical Chemistry Budapest University of Technology and Economics and MTA-BME Computation Driven Chemistry Research Group Szt. Gellért tér 4 1111 Budapest Ungarn
| | - Daniel S. Frost
- Freie Universität Berlin Institut für Chemie und Biochemie Fabeckstraße 34/36 14195 Berlin Deutschland
| | - Simon Steinhauer
- Freie Universität Berlin Institut für Chemie und Biochemie Fabeckstraße 34/36 14195 Berlin Deutschland
| | - Peter Müller
- Department of Chemistry Massachusetts Institute of Technology 77 Massachusetts Avenue, 2-325 Cambridge MA 02139-4307 USA
| | - László Nyulászi
- Department of Inorganic and Analytical Chemistry Budapest University of Technology and Economics and MTA-BME Computation Driven Chemistry Research Group Szt. Gellért tér 4 1111 Budapest Ungarn
| | - Christian Müller
- Freie Universität Berlin Institut für Chemie und Biochemie Fabeckstraße 34/36 14195 Berlin Deutschland
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4
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Giese S, Klimov K, Mikeházi A, Kelemen Z, Frost DS, Steinhauer S, Müller P, Nyulászi L, Müller C. 2-(Dimethylamino)phosphinine: A Phosphorus-Containing Aniline Derivative. Angew Chem Int Ed Engl 2021; 60:3581-3586. [PMID: 33146935 DOI: 10.1002/anie.202014423] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Indexed: 11/09/2022]
Abstract
The yet unknown 2-amino-substituted λ3 ,σ2 -phosphinines are phosphorus-containing aniline derivatives. Calculations show that the strong interaction of the π-donating NR2 group with the aromatic system results in a high π-density at the phosphorus atom. We could now synthesize 2-N(CH3 )2 -functionalized phosphinines, starting from a 3-N(CH3 )2 -substituted 2-pyrone and (CH3 )3 Si-C≡P. Their reaction with CuBr⋅S(CH3 )2 affords CuI complexes with the first example of a neutral phosphinine acting as a rare bridging μ2 -P-4e donor-ligand between two CuI centers. Our experimental and theoretical investigations show that 2-aminophosphinines are missing links in the series of known 2-donor-functionalized phosphinines.
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Affiliation(s)
- Steven Giese
- Freie Universität Berlin, Institut für Chemie und Biochemie, Fabeckstrasse 34/36, 14195, Berlin, Germany
| | - Katrin Klimov
- Freie Universität Berlin, Institut für Chemie und Biochemie, Fabeckstrasse 34/36, 14195, Berlin, Germany
| | - Antal Mikeházi
- Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics and MTA-BME Computation Driven Chemistry Research Group, Szt. Gellért tér 4, 1111, Budapest, Hungary
| | - Zsolt Kelemen
- Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics and MTA-BME Computation Driven Chemistry Research Group, Szt. Gellért tér 4, 1111, Budapest, Hungary
| | - Daniel S Frost
- Freie Universität Berlin, Institut für Chemie und Biochemie, Fabeckstrasse 34/36, 14195, Berlin, Germany
| | - Simon Steinhauer
- Freie Universität Berlin, Institut für Chemie und Biochemie, Fabeckstrasse 34/36, 14195, Berlin, Germany
| | - Peter Müller
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, 2-325, Cambridge, MA, 02139-4307, USA
| | - László Nyulászi
- Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics and MTA-BME Computation Driven Chemistry Research Group, Szt. Gellért tér 4, 1111, Budapest, Hungary
| | - Christian Müller
- Freie Universität Berlin, Institut für Chemie und Biochemie, Fabeckstrasse 34/36, 14195, Berlin, Germany
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5
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Dobulis MA, Thompson MC, Sommerfeld T, Jarrold CC. Temporary anion states of fluorine substituted benzenes probed by charge transfer in O 2 -·C 6H 6-xF x (x = 0-5) ion-molecule complexes. J Chem Phys 2020; 152:204309. [PMID: 32486698 DOI: 10.1063/5.0011321] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The broadband photoelectron source realized by detaching O2 -·X (X = neutral unsaturated molecule) complexes offers a unique opportunity to probe temporary anion states of the unsaturated species. Detachment of the ion molecule complex typically accesses a dissociative portion of the neutral potential, creating a continuum electron source that can undergo scattering with X. We present the application of this new approach to electron-neutral scattering toward a study of the series of fluorinated benzenes via photoelectron spectroscopy of O2 -·C6H6-xFx (x = 0-6) measured with several photon energies. We compare these spectra to the reference O2 -·hexane spectrum and observe evidence of temporary anion states of C6H6-xFx for species with x = 0-5 in the form of enhanced signal intensity at electron kinetic energies coinciding with the energies of the temporary anions. Furthermore, we observe autodetachment features in the x = 3, 5 spectra. Results of calculations on the isolated symmetric isomer of C6H3F3 suggest that the molecule cannot support a weakly-bound non-valence state that could be associated with the observed autodetachment. However, C6HF5 - is predicted to support a valence bound state, which, if produced by charge transfer from O2 - with sufficient vibrational energy, may undergo autodetachment. Finally, the [O2·C6F6]- spectrum is unique insofar as the spectrum is substantially higher in binding energy and qualitatively different from the x = 0-5 spectra. This result suggests much stronger interactions and charge delocalization between O2 - and C6F6.
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Affiliation(s)
- Marissa A Dobulis
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, USA
| | - Michael C Thompson
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, USA
| | - Thomas Sommerfeld
- Department of Chemistry and Physics, Southeast Louisiana University, SLU 10878, Hammond, Louisiana 70402, USA
| | - Caroline Chick Jarrold
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, USA
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6
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Meißner R, Feketeová L, Ribar A, Fink K, Limão-Vieira P, Denifl S. Electron Ionization of Imidazole and Its Derivative 2-Nitroimidazole. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2019; 30:2678-2691. [PMID: 31667709 PMCID: PMC6914720 DOI: 10.1007/s13361-019-02337-w] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Revised: 08/02/2019] [Accepted: 09/08/2019] [Indexed: 05/09/2023]
Abstract
Imidazole (IMI) is a basic building block of many biologically important compounds. Thus, its electron ionization properties are of major interest and essential for the comparison with other molecular targets containing its elemental structure. 2-Nitroimidazole (2NI) contains the imidazole ring together with nitrogen dioxide bound to the C2 position, making it a radiosensitizing compound in hypoxic tumors. In the present study, we investigated electron ionization of IMI and 2NI and determined the mass spectra, the ionization energies, and appearance energies of the most abundant fragment cations. The experiments were complemented by quantum chemical calculations on the thermodynamic thresholds and potential energy surfaces, with particular attention to the calculated transition states for the most important dissociation reactions. In the case of IMI, substantially lower threshold values (up to ~ 1.5 eV) were obtained in the present work compared to the only available previous electron ionization study. Closer agreement was found with recent photon ionization values, albeit the general trend of slightly higher values for the case of electron ionization. The only exception for imidazole was found in the molecular cation at m/z 40 which is tentatively assigned to the quasi-linear HCCNH+/ HCNCH+. Electron ionization of 2NI leads to analogous fragment cations as in imidazole, yet different dissociation pathways must be operative due to the presence of the NO2 group. Regarding the potential radiosensitization properties of 2NI, electron ionization is characterized by dominant parent cation formation and release of the neutral NO radical.
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Affiliation(s)
- Rebecca Meißner
- Institut für Ionenphysik und Angewandte Physik and Center for Molecular Biosciences Innsbruck (CMBI), Universität Innsbruck, Technikerstraße 25, 6020, Innsbruck, Austria.
- Atomic and Molecular Collisions Laboratory, CEFITEC, Department of Physics, Universidade NOVA de Lisboa, 2829-516, Caparica, Portugal.
| | - Linda Feketeová
- Institut für Ionenphysik und Angewandte Physik and Center for Molecular Biosciences Innsbruck (CMBI), Universität Innsbruck, Technikerstraße 25, 6020, Innsbruck, Austria.
- Institut de Physique des 2 Infinis de Lyon; CNRS/IN2P3, UMR5822, Université de Lyon, Université Claude Bernard Lyon 1, 43 Bd du 11 novembre 1918, 69622, Villeurbanne, France.
| | - Anita Ribar
- Institut für Ionenphysik und Angewandte Physik and Center for Molecular Biosciences Innsbruck (CMBI), Universität Innsbruck, Technikerstraße 25, 6020, Innsbruck, Austria
| | - Katharina Fink
- Institut für Ionenphysik und Angewandte Physik and Center for Molecular Biosciences Innsbruck (CMBI), Universität Innsbruck, Technikerstraße 25, 6020, Innsbruck, Austria
| | - Paulo Limão-Vieira
- Atomic and Molecular Collisions Laboratory, CEFITEC, Department of Physics, Universidade NOVA de Lisboa, 2829-516, Caparica, Portugal
| | - Stephan Denifl
- Institut für Ionenphysik und Angewandte Physik and Center for Molecular Biosciences Innsbruck (CMBI), Universität Innsbruck, Technikerstraße 25, 6020, Innsbruck, Austria.
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7
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Asfandiarov NL, Modelli A, Pshenichnyuk SA, Rakhmeev RG, Tayupov MM, Tseplin EE, Tseplina SN. Dissociative electron attachment to 3-benzelidenephthalide and phenolphthalein molecules. J Chem Phys 2019; 151:134302. [DOI: 10.1063/1.5119777] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Affiliation(s)
- N. L. Asfandiarov
- Institute of Molecule and Crystal Physics UFRC RAS, October Avenue 151, 450075 Ufa, Russia
| | - A. Modelli
- Dipartimento di Chimica “G. Ciamician,” Università di Bologna, Via Selmi 2, 40126 Bologna, Italy
- Centro Interdipartimentale di Ricerca in Scienze Ambientali, Università di Bologna, via S. Alberto 163, 48100 Ravenna, Italy
| | - S. A. Pshenichnyuk
- Institute of Molecule and Crystal Physics UFRC RAS, October Avenue 151, 450075 Ufa, Russia
| | - R. G. Rakhmeev
- Institute of Molecule and Crystal Physics UFRC RAS, October Avenue 151, 450075 Ufa, Russia
| | - M. M. Tayupov
- Institute of Molecule and Crystal Physics UFRC RAS, October Avenue 151, 450075 Ufa, Russia
| | - E. E. Tseplin
- Institute of Molecule and Crystal Physics UFRC RAS, October Avenue 151, 450075 Ufa, Russia
| | - S. N. Tseplina
- Institute of Molecule and Crystal Physics UFRC RAS, October Avenue 151, 450075 Ufa, Russia
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8
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Hou Y, Li Z, Li Y, Liu P, Su CY, Puschmann F, Grützmacher H. Making the unconventional μ 2-P bridging binding mode more conventional in phosphinine complexes. Chem Sci 2019; 10:3168-3180. [PMID: 30996898 PMCID: PMC6427944 DOI: 10.1039/c8sc05281f] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2018] [Accepted: 01/16/2019] [Indexed: 12/15/2022] Open
Abstract
As compared to the normal η1-P σ-complexes or η6-phosphinine π-complexes, the rare μ2-P bridging binding mode of phosphinines can be tuned by employing electron donating substitute.
Phosphinines, as aromatic heterocycles, usually engage in coordination as η1-P σ-complexes or η6-phosphinine π-complexes. The μ2-P bridging coordination mode is rarely observed. With the aim to study the effect of different electronic configurations of phosphinines on the coordination modes, a series of anionic phosphinin-2-olates and neutral phosphinin-2-ols were prepared with moderate to high yield. Then the coordination chemistry of these two series was studied in detail towards coinage metals (Au(i) and Cu(i)). It is observed that the anionic phosphinin-2-olates possess a higher tendency to take a bridging position between two metal centers compared to the neutral phosphinin-2-ols. Based on these experimental findings bolstered by DFT calculations, some insight is gained on how the unconventional μ2-P phosphinine bridging coordination mode can be made more conventional and used for the synthesis of polynuclear complexes.
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Affiliation(s)
- Yuanfeng Hou
- Lehn Institute of Functional Materials (LIFM) , School of Chemistry , Sun Yat-Sen University , 510275 Guangzhou , China .
| | - Zhongshu Li
- Lehn Institute of Functional Materials (LIFM) , School of Chemistry , Sun Yat-Sen University , 510275 Guangzhou , China .
| | - Yaqi Li
- Lehn Institute of Functional Materials (LIFM) , School of Chemistry , Sun Yat-Sen University , 510275 Guangzhou , China .
| | - Peng Liu
- Guangdong Engineering and Technology Research Center for Advanced Nanomaterials , School of Environment and Civil Engineering , Dongguan University of Technology , Dongguan 523808 , China
| | - Cheng-Yong Su
- Lehn Institute of Functional Materials (LIFM) , School of Chemistry , Sun Yat-Sen University , 510275 Guangzhou , China .
| | - Florian Puschmann
- Department of Chemistry and Applied Biosciences , ETH Zürich , 8093 Zürich , Switzerland .
| | - Hansjörg Grützmacher
- Lehn Institute of Functional Materials (LIFM) , School of Chemistry , Sun Yat-Sen University , 510275 Guangzhou , China . .,Department of Chemistry and Applied Biosciences , ETH Zürich , 8093 Zürich , Switzerland .
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9
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Li Y, Li Z, Hou Y, Fan YN, Su CY. Photoluminescent Phosphinine Cu(I) Halide Complexes: Temperature Dependence of the Photophysical Properties and Applications as a Molecular Thermometer. Inorg Chem 2018; 57:13235-13245. [PMID: 30288980 DOI: 10.1021/acs.inorgchem.8b01732] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Luminescent thermometers have attracted much attention, because of their fast response, high sensitivity, and noninvasive operation, relative to other traditional thermometers. The extensive studies on the temperature-dependent luminescent properties of Cu(I) complexes make this low-cost metal source a promising candidate as a component of thermometers. Herein, we prepared three luminescent phosphinine Cu(I) complexes whose emission lifetimes are precisely dependent on the temperature variations. For practical utilization, sensor films have been fabricated by doping these Cu(I) complexes into the matrices of polyacrylamide. These films not only exhibit excellent linear correlations between the temperature and emission lifetime over the wide range of 77-337 K, but also show high sensitivity (with the best one to -6.99 μs K-1). These are essential factors for the application in luminescent molecular thermometers. Moreover, the emission mechanism for these Cu(I) complexes are rationalized by the combination of experimental and theoretical results.
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Affiliation(s)
- Yaqi Li
- Lehn Institute of Functional Materials (LIFM), School of Chemistry , Sun Yat-Sen University , Guangzhou 510275 , China
| | - Zhongshu Li
- Lehn Institute of Functional Materials (LIFM), School of Chemistry , Sun Yat-Sen University , Guangzhou 510275 , China
| | - Yuanfeng Hou
- Lehn Institute of Functional Materials (LIFM), School of Chemistry , Sun Yat-Sen University , Guangzhou 510275 , China
| | - Ya-Nan Fan
- Lehn Institute of Functional Materials (LIFM), School of Chemistry , Sun Yat-Sen University , Guangzhou 510275 , China
| | - Cheng-Yong Su
- Lehn Institute of Functional Materials (LIFM), School of Chemistry , Sun Yat-Sen University , Guangzhou 510275 , China
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10
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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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11
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Begum I, Schnakenburg G, Kelemen Z, Nyulászi L, Boeré RT, Streubel R. Expanding the chemistry of ring-fused 1,4-diphosphinines by stable mono anion formation. Chem Commun (Camb) 2018; 54:13555-13558. [DOI: 10.1039/c8cc08158a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Synthesis of a novel tricyclic 1,4-diphosphinine I and, subsequently, of a stable anionic 1,4-diphosphinine II is reported; while II can be used as precursor for 1,4-disubstitution products, its oxidation leads to the formation of the P–P coupling product III.
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Affiliation(s)
- Imtiaz Begum
- Institut für Anorganische Chemie der Rheinischen Friedrich-Wilhelms-Universität Bonn
- 53121 Bonn
- Germany
| | - Gregor Schnakenburg
- Institut für Anorganische Chemie der Rheinischen Friedrich-Wilhelms-Universität Bonn
- 53121 Bonn
- Germany
| | - Zsolt Kelemen
- Department of Inorganic and Analytical Chemistry
- Budapest University of Technology and Economics and MTA-BME Computation Driven Chemistry Research
- 1111 Budapest
- Hungary
| | - László Nyulászi
- Department of Inorganic and Analytical Chemistry
- Budapest University of Technology and Economics and MTA-BME Computation Driven Chemistry Research
- 1111 Budapest
- Hungary
| | - René. T. Boeré
- Department of Chemistry and Biochemistry
- University of Lethbridge
- Lethbridge
- Canada
| | - Rainer Streubel
- Institut für Anorganische Chemie der Rheinischen Friedrich-Wilhelms-Universität Bonn
- 53121 Bonn
- Germany
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12
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Asfandiarov NL, Muftakhov MV, Pshenichnyuk SA, Papp P, Danko M, Lacko M, Blaško J, Matejčik Š, Modelli A. Dissociative electron attachment to 2,4,6-trichloroanisole and 2,4,6-tribromoanisole molecules. J Chem Phys 2017; 147:234302. [DOI: 10.1063/1.5007816] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- N. L. Asfandiarov
- Institute of Molecule and Crystal Physics URC RAS, October Avenue 151, 450075 Ufa, Russia
| | - M. V. Muftakhov
- Institute of Molecule and Crystal Physics URC RAS, October Avenue 151, 450075 Ufa, Russia
| | - S. A. Pshenichnyuk
- Institute of Molecule and Crystal Physics URC RAS, October Avenue 151, 450075 Ufa, Russia
| | - P. Papp
- Department of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Comenius University in Bratislava, Mlynska Dolina F2, 84248 Bratislava, Slovak Republic
| | - M. Danko
- Department of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Comenius University in Bratislava, Mlynska Dolina F2, 84248 Bratislava, Slovak Republic
| | - M. Lacko
- Department of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Comenius University in Bratislava, Mlynska Dolina F2, 84248 Bratislava, Slovak Republic
| | - J. Blaško
- Department of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Comenius University in Bratislava, Mlynska Dolina F2, 84248 Bratislava, Slovak Republic
| | - Š. Matejčik
- Department of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Comenius University in Bratislava, Mlynska Dolina F2, 84248 Bratislava, Slovak Republic
| | - A. Modelli
- Dipartimento di Chimica “G. Ciamician,” Università di Bologna, Via Selmi 2, 40126 Bologna, Italy
- Centro Interdipartimentale di Ricerca in Scienze Ambientali, Università di Bologna, Via S. Alberto 163, 48100 Ravenna, Italy
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13
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Varga Z, Müller C, Nyulászi L. Significant π-stacking effect between 2,4,6-triphenyl-1-phosphabenzenes. Struct Chem 2017. [DOI: 10.1007/s11224-017-0937-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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14
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Szűcs R, Bouit P, Nyulászi L, Hissler M. Phosphorus‐Containing Polycyclic Aromatic Hydrocarbons. Chemphyschem 2017; 18:2618-2630. [DOI: 10.1002/cphc.201700438] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2017] [Revised: 05/30/2017] [Indexed: 12/19/2022]
Affiliation(s)
- Rózsa Szűcs
- Institut des Sciences Chimiques de Rennes, UMR 6226 CNRSUniversité de Rennes 1 Campus de Beaulieu 35042 Rennes Cedex France
- Department of Inorganic and Analytical ChemistryBudapest University of Technology and Economics Szt. Gellert ter 4 H-1111 Budapest Hungary
| | - Pierre‐Antoine Bouit
- Institut des Sciences Chimiques de Rennes, UMR 6226 CNRSUniversité de Rennes 1 Campus de Beaulieu 35042 Rennes Cedex France
| | - László Nyulászi
- Department of Inorganic and Analytical ChemistryBudapest University of Technology and Economics Szt. Gellert ter 4 H-1111 Budapest Hungary
| | - Muriel Hissler
- Institut des Sciences Chimiques de Rennes, UMR 6226 CNRSUniversité de Rennes 1 Campus de Beaulieu 35042 Rennes Cedex France
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15
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Koner A, Pfeifer G, Kelemen Z, Schnakenburg G, Nyulászi L, Sasamori T, Streubel R. 1,4-Diphosphinine aus Imidazol-2-thionen. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201704070] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Abhishek Koner
- Institut für Anorganische Chemie der Rheinischen Friedrich-Wilhelms-Universität Bonn; Gerhard-Domagk-Straße 1 53121 Bonn Deutschland
| | - Gregor Pfeifer
- Institut für Anorganische Chemie der Rheinischen Friedrich-Wilhelms-Universität Bonn; Gerhard-Domagk-Straße 1 53121 Bonn Deutschland
| | - Zsolt Kelemen
- Department of Inorganic and Analytical Chemistry; Budapest University of Technology and Economics; Szt Gellert ter 4 1111 Budapest Ungarn
| | - Gregor Schnakenburg
- Institut für Anorganische Chemie der Rheinischen Friedrich-Wilhelms-Universität Bonn; Gerhard-Domagk-Straße 1 53121 Bonn Deutschland
| | - László Nyulászi
- Department of Inorganic and Analytical Chemistry; Budapest University of Technology and Economics; Szt Gellert ter 4 1111 Budapest Ungarn
| | - Takahiro Sasamori
- Graduate School of Natural Sciences; Nagoya City University; Yamanohata 1, Mizuho-cho Mizuho-ku Nagoya, Aichi 467-8501 Japan
| | - Rainer Streubel
- Institut für Anorganische Chemie der Rheinischen Friedrich-Wilhelms-Universität Bonn; Gerhard-Domagk-Straße 1 53121 Bonn Deutschland
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16
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Koner A, Pfeifer G, Kelemen Z, Schnakenburg G, Nyulászi L, Sasamori T, Streubel R. 1,4-Diphosphinines from Imidazole-2-thiones. Angew Chem Int Ed Engl 2017; 56:9231-9235. [DOI: 10.1002/anie.201704070] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2017] [Indexed: 11/11/2022]
Affiliation(s)
- Abhishek Koner
- Institut für Anorganische Chemie der Rheinischen Friedrich-Wilhelms-Universität Bonn; Gerhard-Domagk-Strasse 1 53121 Bonn Germany
| | - Gregor Pfeifer
- Institut für Anorganische Chemie der Rheinischen Friedrich-Wilhelms-Universität Bonn; Gerhard-Domagk-Strasse 1 53121 Bonn Germany
| | - Zsolt Kelemen
- Department of Inorganic and Analytical Chemistry; Budapest University of Technology and Economics; Szt Gellert ter 4 1111 Budapest Hungary
| | - Gregor Schnakenburg
- Institut für Anorganische Chemie der Rheinischen Friedrich-Wilhelms-Universität Bonn; Gerhard-Domagk-Strasse 1 53121 Bonn Germany
| | - László Nyulászi
- Department of Inorganic and Analytical Chemistry; Budapest University of Technology and Economics; Szt Gellert ter 4 1111 Budapest Hungary
| | - Takahiro Sasamori
- Graduate School of Natural Sciences; Nagoya City University; Yamanohata 1, Mizuho-cho Mizuho-ku Nagoya, Aichi 467-8501 Japan
| | - Rainer Streubel
- Institut für Anorganische Chemie der Rheinischen Friedrich-Wilhelms-Universität Bonn; Gerhard-Domagk-Strasse 1 53121 Bonn Germany
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17
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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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18
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Aromaticity and conformational flexibility of five-membered monoheterocycles: pyrrole-like and thiophene-like structures. Struct Chem 2015. [DOI: 10.1007/s11224-015-0707-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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19
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Chen X, Li Z, Yanan F, Grützmacher H. Synthesis and Photoluminescence Properties of CuIComplexes with Chelating Phosphinito Phosphinine Ligands. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201500933] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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20
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Nauroozi D, Orthaber A. The Heavier Analogues of Alkenes: A Theoretical Comparison of Unsaturated Group 15/14 Systems. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201500848] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Djawed Nauroozi
- Department of Chemistry – Ångström Laboratories, Uppsala University, Box 523, 75120 Uppsala, Sweden, http://www.kemi.uu.se/forskning/molekylar‐biomimetik/molekylar‐oorganisk‐kemi/orthaber‐group/
| | - Andreas Orthaber
- Department of Chemistry – Ångström Laboratories, Uppsala University, Box 523, 75120 Uppsala, Sweden, http://www.kemi.uu.se/forskning/molekylar‐biomimetik/molekylar‐oorganisk‐kemi/orthaber‐group/
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21
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Pshenichnyuk SA, Modelli A. ETS and DEAS studies of the reduction of xenobiotics in mitochondrial intermembrane space. Methods Mol Biol 2015; 1265:285-305. [PMID: 25634282 DOI: 10.1007/978-1-4939-2288-8_20] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
This chapter describes the complementary experimental techniques electron transmission spectroscopy (ETS) and dissociative electron attachment spectroscopy (DEAS), two of the most suitable means for investigating interactions between electrons and gas-phase molecules, resonance formation of temporary molecular negative ions, and their possible decay through the dissociative electron attachment (DEA) mechanism. The latter can be seen as the gas-phase counterpart of the transfer of a solvated electron in solution, accompanied by dissociation of the molecular anion, referred to as dissociative electron transfer (DET). DET takes place in vivo under reductive conditions, for instance, in the intermembrane space of mitochondria under interaction of xenobiotic molecules with electrons "leaked" from the respiration chain. Experimental procedures supported by suitable quantum chemical calculations are described in detail and illustrated by an example of ETS/DEAS study of rhodanine which shows rich fragmentation under gas-phase resonance electron attachment.
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Affiliation(s)
- Stanislav A Pshenichnyuk
- Institute of Molecule and Crystal Physics, Ufa Research Centre, Russian Academy of Sciences, Prospeкt Oktyabrya 151, 450075, Ufa, Russia,
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22
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Electron affinity calculation for selected PAHs using DFT: Effect of cyclopenta ring fusion and aromaticity. COMPUT THEOR CHEM 2015. [DOI: 10.1016/j.comptc.2015.07.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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23
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24
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Sklorz JAW, Hoof S, Rades N, De Rycke N, Könczöl L, Szieberth D, Weber M, Wiecko J, Nyulászi L, Hissler M, Müller C. Pyridyl-Functionalised 3H-1,2,3,4-Triazaphospholes: Synthesis, Coordination Chemistry and Photophysical Properties of Low-Coordinate Phosphorus Compounds. Chemistry 2015; 21:11096-109. [DOI: 10.1002/chem.201500988] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2015] [Indexed: 11/06/2022]
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25
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Asfandiarov NL, Pshenichnyuk SA, Vorob’ev AS, Nafikova EP, Lachinov AN, Kraikin VA, Modelli A. Electron attachment to the phthalide molecule. J Chem Phys 2015; 142:174308. [DOI: 10.1063/1.4919631] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- N. L. Asfandiarov
- Institute of Molecule and Crystal Physics, Ufa Research Centre, Russian Academy of Sciences, Prospect Oktyabrya 151, 450075 Ufa, Russia
- Bashkir State Pedagogical University, Oktyabrskoy Revolutsii St., 3a, 450000 Ufa, Russia
| | - S. A. Pshenichnyuk
- Institute of Molecule and Crystal Physics, Ufa Research Centre, Russian Academy of Sciences, Prospect Oktyabrya 151, 450075 Ufa, Russia
- St.-Petersburg State University, Uljanovskaja, 1, 198504 St.-Petersburg, Russia
| | - A. S. Vorob’ev
- Institute of Molecule and Crystal Physics, Ufa Research Centre, Russian Academy of Sciences, Prospect Oktyabrya 151, 450075 Ufa, Russia
| | - E. P. Nafikova
- Institute of Molecule and Crystal Physics, Ufa Research Centre, Russian Academy of Sciences, Prospect Oktyabrya 151, 450075 Ufa, Russia
| | - A. N. Lachinov
- Bashkir State Pedagogical University, Oktyabrskoy Revolutsii St., 3a, 450000 Ufa, Russia
| | - V. A. Kraikin
- Institute of Organic Chemistry, Ufa Research Centre, Russian Academy of Sciences, Prospect Oktyabrya 59, 450075 Ufa, Russia
| | - A. Modelli
- Dipartimento di Chimica “G. Ciamician,” Universitá di Bologna, Via Selmi 2, 40126 Bologna, Italy
- Centro Interdipartimentale di Ricerca in Scienze Ambientali (CIRSA), Universitá di Bologna, Via S. Alberto 163, 48123 Ravenna, Italy
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Kalimullina LR, Nafikova EP, Asfandiarov NL, Chizhov YV, Baibulova GS, Zhdanov ER, Gadiev RM. Theoretical estimation of the electron affinity for quinone derivatives by means of density functional theory. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2015. [DOI: 10.1134/s0036024415030152] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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27
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de Krom I, Lutz M, Müller C. 2-(2′-Pyridyl)-4,6-diphenylphosphinine versus 2-(2′-pyridyl)-4,6-diphenylpyridine: synthesis and characterization of novel Cr0, Mo0 and W0 carbonyl complexes containing chelating P,N and N,N ligands. Dalton Trans 2015; 44:10304-14. [DOI: 10.1039/c5dt01261a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Replacing nitrogen by phosphorus in otherwise similar structures changes the properties of the resulting compounds significantly due to the electronic differences that exist between these heteroatoms.
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Affiliation(s)
- Iris de Krom
- Schuit Institute of Catalysis
- Department of Chemical Engineering and Chemistry
- Eindhoven University of Technology
- 5600 MB Eindhoven
- The Netherlands
| | - Martin Lutz
- Bijvoet Center for Biomolecular Research
- Department of Crystal and Structural Chemistry
- Utrecht University
- 3584 CH Utrecht
- The Netherlands
| | - Christian Müller
- Schuit Institute of Catalysis
- Department of Chemical Engineering and Chemistry
- Eindhoven University of Technology
- 5600 MB Eindhoven
- The Netherlands
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Fekete C, Nyulászi L, Kovács I. Synthesis and NMR Characterization of 2,5-Bis(Trimethylsilyl)-3,4-Diphenyl-1-Silacyclopentadienyl Dianion. PHOSPHORUS SULFUR 2014. [DOI: 10.1080/10426507.2014.905574] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Csaba Fekete
- Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Budapest, H-1111, Hungary
| | - László Nyulászi
- Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Budapest, H-1111, Hungary
| | - Ilona Kovács
- Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Budapest, H-1111, Hungary
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29
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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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30
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Kostenko N, Ericsson C, Engqvist M, Gonzalez SV, Bayer A. Palladium(0)-Catalyzed Cross-Couplings of 2-Bromophosphinine. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300710] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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31
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Modelli A, Pshenichnyuk SA. Gas-phase dissociative electron attachment to flavonoids and possible similarities to their metabolic pathways. Phys Chem Chem Phys 2013; 15:1588-600. [PMID: 23243660 DOI: 10.1039/c2cp43379f] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The gas-phase empty-level structures and formation of anion states via resonance attachment of low-energy electrons to the flavonoids naringenin (III), quercetin (IV) and myricetin (V) and the smaller reference molecules chromone (I) and flavone (II) are investigated experimentally for the first time. Dissociative electron attachment spectroscopy (DEAS) is used to measure the fragment anion currents generated through dissociative decay channels of the molecular anions of compounds I–V, detected with a mass filter as a function of the incident electron energy in the 0–14 eV energy range. Due to the insufficient volatility of flavonoids III–V, the energies of vertical electron attachment associated with temporary occupation of the lower-lying virtual orbitals are measured with electron transmission spectroscopy (ETS) only in the smaller reference molecules I and II. The experimental findings are interpreted with the support of appropriate density functional theory calculations with the B3LYP functional. The experimental vertical electron attachment energies measured in the ET spectra of I and II are compared with the orbital energies of the neutral molecules scaled using an empirically calibrated linear equation. The vertical and adiabatic electron affinities are evaluated at the B3LYP/6-31+G(d) level as the anion/neutral total energy difference. The latter theoretical method is also used for evaluation of the most stable conformers of the neutral molecules, O–H bond dissociation energies and thermodynamic energy thresholds for production of the anion fragments observed in the DEA spectra. A possible role played by loss of an H(2) molecule from the parent molecular anion in vivo in the mitochondrial respiratory chain is briefly discussed.
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Affiliation(s)
- Alberto Modelli
- Università di Bologna, Dipartimento di Chimica G. Ciamician, via, Selmi 2, 40126 Bologna, Italy.
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Cypryk M, Krasiński G, Mikołajczyk M. Structure and reactivity of thiosulfonic acids and their anions: A theoretical study. HETEROATOM CHEMISTRY 2012. [DOI: 10.1002/hc.21021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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34
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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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35
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Townsend NS, Green M, Russell CA. Cationic Gold(I) Complexes of 2,4,6-Tri-tert-butyl-1,3,5-triphosphabenzene. Organometallics 2012. [DOI: 10.1021/om201265n] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nell S. Townsend
- School of Chemistry, University of Bristol, Cantock’s
Close, Bristol BS8 1TS, U.K
| | - Michael Green
- School of Chemistry, University of Bristol, Cantock’s
Close, Bristol BS8 1TS, U.K
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36
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Modelli A, Bolognesi P, Avaldi L. Temporary anion states of pyrimidine and halopyrimidines. J Phys Chem A 2011; 115:10775-82. [PMID: 21875136 DOI: 10.1021/jp206559d] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The empty-level electronic structures of pyrimidine and its 2-chloro, 2-bromo, and 5-bromo derivatives have been studied with electron transmission spectroscopy (ETS) and dissociative electron attachment spectroscopy (DEAS) in the 0-5 eV energy range. The spectral features were assigned to the corresponding anion states with the support of theoretical calculations at the ab initio and density functional theory levels. The empty orbital energies obtained by simple Koopmans' theorem calculations, scaled with empirical equations, quantitatively reproduced the energies of vertical electron attachment to π* and σ* empty orbitals measured in the ET spectra and predicted vertical electron affinities close to zero for the three halo derivatives. The total anion currents of the halo derivatives, measured at the walls of the collision chamber as a function of the impact electron energy, presented intense maxima below 0.5 eV. The mass-selected spectra showed that, in this energy, range the total anion current is essentially due to halide fragment anions. The DEA cross sections of the bromo derivatives were found to be about six times larger than that of the chloro derivative. The absolute cross sections at incident electron energies close to zero were evaluated to be 10(-16)-10(-15) cm(2).
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Affiliation(s)
- Alberto Modelli
- Dipartimento di Chimica G. Ciamician, Università di Bologna, via Selmi 2, 40126 Bologna, Italy.
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37
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Phosphinine-Based Ligands in Homogeneous Catalysis: State of the Art and Future Perspectives. ACTA ACUST UNITED AC 2011. [DOI: 10.1007/978-90-481-3817-3_6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/05/2023]
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38
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Modelli A, Burrow PD. Electron Attachment to Dye-Sensitized Solar Cell Components: Cyanoacetic Acid. J Phys Chem A 2011; 115:1100-7. [DOI: 10.1021/jp110813f] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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, Università di Bologna, via S. Alberto 163, 48123 Ravenna, Italy
| | - Paul D. Burrow
- Department of Physics and Astronomy, University of Nebraska—Lincoln, Lincoln, Nebraska 68588-0111, United States
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39
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Modelli A, Jones D. Empty level structure of boryl-substituted pentacyclic heteroaromatics. Phys Chem Chem Phys 2011; 13:276-81. [DOI: 10.1039/c0cp01324b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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40
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Hajgató B, De Proft F, Szieberth D, Tozer DJ, Deleuze MS, Geerlings P, Nyulászi L. Bonding in negative ions: the role of d orbitals in the heavy analogues of pyridine and furanradical anions. Phys Chem Chem Phys 2011; 13:1663-8. [DOI: 10.1039/c0cp01151g] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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41
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Pshenichnyuk SA, Vorob'ev AS, Asfandiarov NL, Modelli A. Molecular anion formation in 9,10-anthraquinone: Dependence of the electron detachment rate on temperature and incident electron energy. J Chem Phys 2010; 132:244313. [PMID: 20590199 DOI: 10.1063/1.3456737] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Attachment of low-energy electrons to gas phase 9,10-anthraquinone (AQ) was observed with electron transmission (ET) spectroscopy, and interpreted with the support of quantum chemical calculations. The ET spectrum displays three shape resonances at 0.45, 0.7, and 2.2 eV, associated with temporary electron capture into empty pi( *) molecular orbitals of AQ, the first two anion states being stable. According to TD-B3LYP calculations, the first pi-pi( *) core-excited resonance lies at about 1.8 eV, although no experimental evidence for this anion state was found. The long-lived parent molecular anion [AQ](-) was observed by means of Electron Attachment Spectroscopy (EAS) using two different mass spectrometers and also by measuring the total anion current at the collision chamber walls. The molecular anion current shows maxima at zero energy, around 0.6 eV and at 1.8 eV. Association of these maxima with the corresponding resonant anion states is discussed. The experimentally measured electron detachment times from [AQ](-) as a function of the incident electron energy and the temperature of the target molecule show a pronounced change of slope around 1.5 eV, regardless of the temperature. This unexpected behavior can be qualitatively reproduced within the framework of a multiexponential approach which describes the electron detachment event in terms of a redistribution of the anion excess energy, regardless of the initial mechanism of temporary anion formation.
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Affiliation(s)
- Stanislav A Pshenichnyuk
- Institute of Physics of Molecules and Crystals, Ufa Research Center, Russian Academy of Sciences, October Avenue, 151, 450075 Ufa, Russia.
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Benkő Z, Burck S, Gudat D, Hofmann M, Lissner F, Nyulászi L, Zenneck U. Towards Spontaneous Heterolysis of the Homonuclear PP Bond in Diphosphines: The Case of Diazaphospholeniumtriphospholides. Chemistry 2010; 16:2857-65. [DOI: 10.1002/chem.200902931] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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44
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Lungu D, Daniliuc C, Jones PG, Nyulászi L, Benkõ Z, Bartsch R, du Mont W. Exceptional Coordination Mode of Unsaturated PNP Ligands (Me
3
Si)
2
C=PN(R)PPh
2
with Palladium and Platinum Dichlorides: Insertion of Phosphaalkene Phosphorus Atoms into Metal–Chlorine Bonds. Eur J Inorg Chem 2009. [DOI: 10.1002/ejic.200900236] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Daniela Lungu
- Institut für Anorganische und Analytische Chemie der Technischen Universität Braunschweig, Hagenring 30, 38106, Braunschweig, Germany
| | - Constantin Daniliuc
- Institut für Anorganische und Analytische Chemie der Technischen Universität Braunschweig, Hagenring 30, 38106, Braunschweig, Germany
| | - Peter G. Jones
- Institut für Anorganische und Analytische Chemie der Technischen Universität Braunschweig, Hagenring 30, 38106, Braunschweig, Germany
| | - László Nyulászi
- Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Szt Gellert ter 4, 1521, Budapest, Hungary
| | - Zoltán Benkõ
- Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Szt Gellert ter 4, 1521, Budapest, Hungary
| | - Rainer Bartsch
- Institut für Anorganische und Analytische Chemie der Technischen Universität Braunschweig, Hagenring 30, 38106, Braunschweig, Germany
| | - Wolf‐W. du Mont
- Institut für Anorganische und Analytische Chemie der Technischen Universität Braunschweig, Hagenring 30, 38106, Braunschweig, Germany
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Dienes Y, Eggenstein M, Kárpáti T, Sutherland T, Nyulászi L, Baumgartner T. Phosphorus-Based Heteropentacenes: Efficiently Tunable Materials for Organic n-Type Semiconductors. Chemistry 2008; 14:9878-89. [DOI: 10.1002/chem.200801549] [Citation(s) in RCA: 122] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Alberti A, Galasso V, Kovac B, Modelli A, Pichierri F. Probing the molecular and electronic structure of capsaicin: a spectroscopic and quantum mechanical study. J Phys Chem A 2008; 112:5700-11. [PMID: 18507451 DOI: 10.1021/jp801890g] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The conformational preferences of capsaicin were investigated by using the hybrid meta density functional theory (DFT) method MPWB1K. Its flexible, pendant side chain allows for a multitude of conformations only slightly different in energy. The distinctive vibrational features of the most stable conformers were characterized. To elucidate the most favorable reaction sites of capsaicin for radical scavenging, various homolytic bond-dissociation energies were also calculated. Of the possible radical intermediates, the allyl and benzyl radicals are energetically preferred. The filled and empty electronic structures of capsaicin were investigated by exploiting the photoelectron and electron-transmission spectra also of reference molecules and suitable quantum-mechanical calculations. On this basis, a reliable pattern of the vertical ionization energies and electron-attachment energies of capsaicin was proposed. The frontier pi molecular orbitals are concentrated over the vanillyl moiety, with a modest influence of the amidic-aliphatic chain. The (negative) first vertical electron affinity is predicted to be similar to that of benzene. The absorption spectrum of capsaicin and its change by conversion into a phenolic deprotonated anion (modest bathochromic displacement) or a phenoxyl neutral radical (from colorless to red) were interpreted with time-dependent DFT calculations. ESR measurements following chemical or electrochemical reduction of capsaicin did not lead to detection of the corresponding radical anion. The spectra show fragmentation of the original molecule and formation of a variety of radical species which are believed to have a semiquinonic structure.
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Affiliation(s)
- A Alberti
- ISOF, Area della Ricerca del CNR, Via Gobetti 101, I-40129 Bologna, Italy
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Galasso V, Kovač B, Modelli A, Ottaviani MF, Pichierri F. Spectroscopic and Theoretical Study of the Electronic Structure of Curcumin and Related Fragment Molecules. J Phys Chem A 2008; 112:2331-8. [DOI: 10.1021/jp7108303] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- V. Galasso
- Dipartimento di Scienze Chimiche, Università di Trieste, I-34127 Trieste, Italy
| | - B. Kovač
- The Rud-er Bošković Institute, HR-10002, Zagreb, Croatia
| | - A. Modelli
- Dipartimento di Chimica “G. Ciamician”, Università di Bologna, I-40129 Bologna, Italy, and Centro Interdipartimentale di Ricerca in Scienze Ambientali, Università di Bologna, I-48100 Ravenna, Italy
| | - M. F. Ottaviani
- Istituto di Scienze Chimiche, Università di Urbino, I-61029 Urbino, Italy
| | - F. Pichierri
- Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, Aoba-yama 6-6-07, Sendai 980-8579, Japan
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Clendenning SB, Hitchcock PB, Lappert MF, Merle PG, Nixon JF, Nyulászi L. Synthesis of the 2,4,5-Tri-tert-butyl-1,3-diphospholide Anion by Phosphinidene Elimination from 2,4,6-Tri-tert-butyl-1,3,5-triphosphabenzene on Treatment with the Amide Li[NPh(SiMe3)]. Chemistry 2007; 13:7121-8. [PMID: 17562533 DOI: 10.1002/chem.200601626] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Treatment of the lithium amide Li[NPh(SiMe3)] with 2,4,6-tri-tert-butyl-1,3,5-triphosphabenzene, P(3)C(3)tBu(3), in a 1:2 ratio afforded equimolar amounts of the lithium salt of the five-membered 2,4,5-tri-tert-butyl-1,3-diphospholide anion, LiP(2)C(3)tBu(3) (isolated as its N,N,N',N'-tetramethylethylenediamine (TMEDA) adduct), and the tricyclic compound 6-[phenyl(trimethylsilyl)amino]-3,5,7-tri-tert-butyl-1,2,4,6-tetraphosphatricyclo[3.2.0.0(2,7)]hept-3-ene. Both compounds have been structurally characterised by single-crystal X-ray diffraction studies. The mechanism of this remarkable reaction has been elucidated by theoretical methods at the B3LYP/6-311+G** level of theory. The reaction involves a hitherto unobserved aminophosphinidene, which was formed by abstraction of a phosphorus atom from triphosphabenzene. The intermediate aminophosphinidene, which is further stabilised by the solvent THF, shows, in agreement with previous theoretical predictions, enhanced stability and reacts then with a second molecule of triphosphabenzene.
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Affiliation(s)
- Scott B Clendenning
- Chemistry Department, School of Life Sciences, University of Sussex, Brighton, BN1 9QJ, Sussex, UK
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Modelli A, Galasso V. Dissociative Electron Attachment to Di-tert-butylperoxide, Artemisinin, and β-Artemether. J Phys Chem A 2007; 111:7787-92. [PMID: 17636969 DOI: 10.1021/jp072720z] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The gas-phase dissociative electron attachment spectra of di-tert-butylperoxide (DBP) and the antimalarial polycyclic peroxides artemisinin and beta-artemether are presented for the first time. The total anion currents measured at the walls of the collision chamber and the mass selected anion currents are reported in the 0-6 eV energy range. Electron attachment to DBP produces an intense current, peaking at 1.3 eV, due to the C4H9O- negative fragment, in line with the strongly O-O antibonding character of the singly occupied orbital of the parent molecular anion and the small (if any) thermodynamic energy threshold predicted by B3LYP calculations for the formation of this anion fragment. A five times less intense signal, with m/e = 57 and a maximum at 0.7 eV, is also observed. The calculations exclude that this signal can be associated with the C4H9- negative fragment, whereas they support its assignment to the C3H5O- species, generated by simultaneous dissociation and loss of a methane molecule from the parent molecular anion. In DBP, artemisinin, and beta-artemether, currents corresponding to the parent molecular anion are not detected, indicating that its survival time is shorter than the time required (about 10-6 s) to pass through the mass filter. In the latter two compounds, where simple O-O bond breaking does not generate separate fragments, the anion currents are much weaker than in DBP and the maximum total anion current peaks at zero energy.
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Affiliation(s)
- Alberto Modelli
- Dipartimento di Chimica "G. Ciamician", Università di Bologna, I-40126 Bologna, Italy.
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