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Khatymov RV, Muftakhov MV, Tuktarov RF, Shchukin PV, Khatymova LZ, Pancras E, Terentyev AG, Petrov NI. Resonant electron capture by polycyclic aromatic hydrocarbon molecules: Effects of aza-substitution. J Chem Phys 2024; 160:124310. [PMID: 38533882 DOI: 10.1063/5.0195316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2024] [Accepted: 03/07/2024] [Indexed: 03/28/2024] Open
Abstract
Resonant electron capture by aza and diaza derivatives of phenanthrene (7,8-benzoquinoline and 1,10-phenanthroline) and anthracene (acridine and phenazine) at incident free electron energies (Ee) in the range of 0-15 eV was studied. All compounds except 7,8-benzoquinoline form long-lived molecular ions (M-) at thermal electron energies (Ee ∼ 0 eV). Acridine and phenazine also form such ions at epithermal electron energies up to Ee = 1.5-2.5 eV. The lifetimes (τa) of M- with respect to electron autodetachment are proportional to the extent of aza-substitution and increase on going from molecules with bent geometry of the fused rings (azaphenanthrenes) to linear isomers (azaanthracenes). These regularities are due to an increase in the adiabatic electron affinities (EAa) of the molecules. The EAa values of the molecules under study were comprehensively assessed based on a comparative analysis of the measured τa values using the Rice-Ramsperger-Kassel-Marcus theory, the electronic structure analysis using the molecular orbital approach, as well as the density functional calculations of the total energy differences between the molecules and anions. The only fragmentation channel of M- ions from the compounds studied is abstraction of hydrogen atoms. When studying [M-H]- ions, electron autodetachment processes were observed, the τa values were measured, and the appearance energies were determined. A comparative analysis of the gas-phase acidity of the molecules and the EAa values of the [M-H]· radicals revealed their proportionality to the EAa values of the parent molecules.
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Affiliation(s)
- Rustem V Khatymov
- Mendeleev University of Chemical Technology of Russia, Miusskaya Square, 9, 125047 Moscow, Russia
| | - Mars V Muftakhov
- Institute of Molecule and Crystal Physics, Ufa Federal Research Center, Russian Academy of Sciences, Prospekt Oktyabrya, 151, 450075 Ufa, Russia
| | - Renat F Tuktarov
- Institute of Molecule and Crystal Physics, Ufa Federal Research Center, Russian Academy of Sciences, Prospekt Oktyabrya, 151, 450075 Ufa, Russia
| | - Pavel V Shchukin
- Institute of Molecule and Crystal Physics, Ufa Federal Research Center, Russian Academy of Sciences, Prospekt Oktyabrya, 151, 450075 Ufa, Russia
| | - Lyaysan Z Khatymova
- Institute of Molecule and Crystal Physics, Ufa Federal Research Center, Russian Academy of Sciences, Prospekt Oktyabrya, 151, 450075 Ufa, Russia
| | - Eugene Pancras
- Ufa State Petroleum Technological University, ul. Kosmonavtov, 1, 450064 Ufa, Russia
| | - Andrey G Terentyev
- Mendeleev University of Chemical Technology of Russia, Miusskaya Square, 9, 125047 Moscow, Russia
| | - Nikolay I Petrov
- Mendeleev University of Chemical Technology of Russia, Miusskaya Square, 9, 125047 Moscow, Russia
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2
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Asfandiarov NL, Muftakhov MV, Pshenichnyuk SA. Long-lived molecular anions of brominated diphenyl ethers. J Chem Phys 2023; 158:2891443. [PMID: 37195822 DOI: 10.1063/5.0148717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Accepted: 04/30/2023] [Indexed: 05/19/2023] Open
Abstract
Resonance electron attachment in a series of brominated diphenyl ethers, namely 4-bromodiphenyl ether (BDPE), 4-bromophenyl ether (BPE), and decabromodiphenyl ether (DBDE), was investigated in the gas phase by means of dissociative electron attachment spectroscopy. In addition to channels of dissociation into stable fragments, long-lived molecular negative ions with an average lifetime relative to autodetachment of the order of 60 µs were found for the last two molecules. In the case of BDPE and BPE, the most intense dissociation channel is the bromine anion, and for DBDE-the [C6Br5O]- anion. The [C6Br5O]- anion sequentially decomposes with the elimination of the bromide anion on a microsecond time scale, which is confirmed by the registration of metastable ions with an apparent mass of 12.8 a.m.u. The electron affinity of the studied molecules and the appearance energy of fragment ions were estimated with CAM-B3LYP/6-311+G(d,p).
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Affiliation(s)
- N L Asfandiarov
- Institute of Molecule and Crystal Physics-Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences, Prospekt Octyabrya, 151, 450075 Ufa, Russia
| | - M V Muftakhov
- Institute of Molecule and Crystal Physics-Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences, Prospekt Octyabrya, 151, 450075 Ufa, Russia
| | - S A Pshenichnyuk
- Institute of Molecule and Crystal Physics-Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences, Prospekt Octyabrya, 151, 450075 Ufa, Russia
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3
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Pshenichnyuk SA, Asfandiarov NL, Rakhmeyev RG, Safronov AM, Komolov AS. On delicate balance between formation and decay of tetracyanoethylene molecular anion triggered by resonance electron attachment. J Chem Phys 2023; 158:2887211. [PMID: 37114708 DOI: 10.1063/5.0149262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2023] [Accepted: 04/12/2023] [Indexed: 04/29/2023] Open
Abstract
Low-energy (0-15 eV) resonance electron interaction with isolated tetracyanoethylene (TCNE) molecules is studied in vacuo by means of dissociative electron attachment (DEA) spectroscopy. Despite this molecule being relatively small, the long-lived molecular anions TCNE- are formed not only at thermal electron energy via a vibrational Feshbach resonance mechanism but also via shape resonances with the occupation of the π4* and π5* molecular orbitals by an incident electron. Dissociative decays of TCNE- are mostly observed at incident electron energy above the π7* temporary anion state predicted to lie at 1.69 eV by means of B3LYP/6-31G(d) calculations combined with the empirical scaling procedure. Electron attachment to the π6* orbital (predicted at 0.85 eV) leads to the generation of long-lived TCNE- species, which can decay via two competing processes: extra electron detachment, which appears in hundreds of microseconds, or elimination of two cyano groups to form the [TCNE - 2(CN)]- negative fragment on a tens of microsecond timescale. The latter is accompanied by the generation of a highly toxic cyanogen molecule as a neutral counterpart. Since the electron transfer to the acceptor molecule TCNE plays a key role in the formation of single-molecule magnets, the present data are of importance to understand the long-term behavior and likely harmful effects produced by cyanide-based prospective materials.
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Affiliation(s)
- Stanislav A Pshenichnyuk
- Institute of Molecule and Crystal Physics, Ufa Federal Research Centre, Russian Academy of Sciences, Prospekt Oktyabrya 151, 450075 Ufa, Russia
| | - Nail L Asfandiarov
- Institute of Molecule and Crystal Physics, Ufa Federal Research Centre, Russian Academy of Sciences, Prospekt Oktyabrya 151, 450075 Ufa, Russia
| | - Rustam G Rakhmeyev
- Institute of Molecule and Crystal Physics, Ufa Federal Research Centre, Russian Academy of Sciences, Prospekt Oktyabrya 151, 450075 Ufa, Russia
| | - Aleksey M Safronov
- Institute of Molecule and Crystal Physics, Ufa Federal Research Centre, Russian Academy of Sciences, Prospekt Oktyabrya 151, 450075 Ufa, Russia
| | - Alexei S Komolov
- St. Petersburg State University, Universitetskaya nab. 7/9, 199034 St. Petersburg, Russia
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4
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Asfandiarov NL, Galeev RV, Pshenichnyuk SA. Dissociative electron attachment to p-fluoranil and p-chloranil. J Chem Phys 2022; 157:084304. [DOI: 10.1063/5.0102359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The processes of formation and decay of negative molecular ions (NMI) of p-fluoranil (2,3,5,6-tetrafluoro-1,4-benzoquinone, FA) and p-chloranil (2,3,5,6-tetrachloro-1,4-benzoquinone, CA) in the gas phase were investigated. In both cases, long-lived NMIs were found in two resonances, at thermal electron energies and in the region of 0.8-0.9 eV, with lifetimes relative to electron ejection of t a~600 μs. The dissociation of molecular NIs with the formation of fragment ions [M-COF2]ˉ, [M-CO]ˉ and Clˉ proceeds at microsecond times, which is confirmed by the registration of the corresponding metastable ions. It is shown that the dependence of the lifetime of molecular NIs on the electron energy can be explained by the presence of a transition state at an energy of ~0.5 eV.
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5
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Goryunkov AA, Asfandiarov NL, Rakhmeev RG, Markova AV, Pshenichnyuk SA, Rybalchenko AV, Lukonina NS, Ioffe IN. Dissociative electron attachment to hexachlorobenzene. Chemphyschem 2022; 23:e202200038. [PMID: 35286008 DOI: 10.1002/cphc.202200038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Revised: 03/11/2022] [Indexed: 11/09/2022]
Abstract
Gas phase molecules of hexachlorobenzene (C 6 Cl 6 ) were investigated by means of Dissociative Electron Attachment Spectroscopy (DEAS). Three channels of molecular negative ions decay have been recorded: Cl- and Cl 2 - as well as electron detachment (t a ~250 ms at 343 K). All of these decay channels exhibit temperature dependence. The electron affinity was estimated within the framework of the simple Arrhenius model (EA=1.6-1.9 eV), as well as quantum-chemically at various levels (EA a =0.9-1.0 eV). The reasons for the discrepancy between the obtained estimates of the EA value and the results of previous works (EA from 1 to 2 eV) are discussed.
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Affiliation(s)
- Alexey A Goryunkov
- Lomonosov Moscow State University, Dept. of Chemistry, Leninskie Gory, 1, 199992, Moscow, RUSSIAN FEDERATION
| | - Nail L Asfandiarov
- FSBSI UFRC RAS: FGBNU Ufimskij federal'nyj issledovatel'skij centr Rossijskoj akademii nauk, Institute of Molecule and Crystal Physics, RUSSIAN FEDERATION
| | - Rustam G Rakhmeev
- FSBSI UFRC RAS: FGBNU Ufimskij federal'nyj issledovatel'skij centr Rossijskoj akademii nauk, Institute of Molecule and Crystal Physics, RUSSIAN FEDERATION
| | - Angelina V Markova
- FSBSI UFRC RAS: FGBNU Ufimskij federal'nyj issledovatel'skij centr Rossijskoj akademii nauk, Institute of Molecule and Crystal Physics, RUSSIAN FEDERATION
| | - Stanislav A Pshenichnyuk
- FSBSI UFRC RAS: FGBNU Ufimskij federal'nyj issledovatel'skij centr Rossijskoj akademii nauk, Institute of Molecule and Crystal Physics, RUSSIAN FEDERATION
| | - Alexey V Rybalchenko
- Lomonosov Moscow State University: Moskovskij gosudarstvennyj universitet imeni M V Lomonosova, Chemistry, RUSSIAN FEDERATION
| | - Natalia S Lukonina
- Lomonosov Moscow State University: Moskovskij gosudarstvennyj universitet imeni M V Lomonosova, Chemistry, RUSSIAN FEDERATION
| | - Ilya N Ioffe
- Lomonosov Moscow State University: Moskovskij gosudarstvennyj universitet imeni M V Lomonosova, Chemistry, RUSSIAN FEDERATION
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6
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Asfandiarov NL, Muftakhov MV, Pshenichnyuk SA, Rakhmeev RG, Safronov AM, Markova AV, Vorob'ev AS, Luxford TFM, Kočišek J, Fedor J. Non-covalent anion structures in dissociative electron attachment to some brominated biphenyls. J Chem Phys 2021; 155:244302. [PMID: 34972364 DOI: 10.1063/5.0074013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The present work combines experiment and theory to reveal the behavior of bromo-substituted-biphenyls after an electron attachment. We experimentally determine anion lifetimes using an electron attachment-magnetic sector mass spectrometer instrument. Branching ratios of dissociative electron attachment fragments on longer timescales are determined using the electron attachment-quadrupole mass spectrometer instrument. In all cases, fragmentation is low: Only the Br- and [M-Br]- ions are detected, and [M-H]- is observed only in the case of 4-Br-biphenyl and parent anion lifetimes as long as 165 µs are observed. Such lifetimes are contradictory to the dissociation rates of 2- and 4-bromobiphenyl, as measured by the pulse radiolysis method to be 3.2 × 1010 and >5 × 1010 s-1, respectively. The discrepancy is plausibly explained by our calculation of the potential energy surface of the dissociating anion. Isolated in vacuum, the bromide anion can orbit the polarized aromatic radical at a long distance. A series of local minima on the potential energy surface allows for a roaming mechanism prolonging the detection time of such weakly bound complex anions. The present results illuminate the behavior recently observed in a series of bromo-substituted compounds of biological as well as technological relevance.
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Affiliation(s)
- N L Asfandiarov
- Institute of Molecule and Crystal Physics - Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences, Prospekt Oktyabrya 151, Ufa 450075, Russia
| | - M V Muftakhov
- Institute of Molecule and Crystal Physics - Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences, Prospekt Oktyabrya 151, Ufa 450075, Russia
| | - S A Pshenichnyuk
- Institute of Molecule and Crystal Physics - Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences, Prospekt Oktyabrya 151, Ufa 450075, Russia
| | - R G Rakhmeev
- Institute of Molecule and Crystal Physics - Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences, Prospekt Oktyabrya 151, Ufa 450075, Russia
| | - A M Safronov
- Institute of Molecule and Crystal Physics - Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences, Prospekt Oktyabrya 151, Ufa 450075, Russia
| | - A V Markova
- Institute of Molecule and Crystal Physics - Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences, Prospekt Oktyabrya 151, Ufa 450075, Russia
| | - A S Vorob'ev
- Moscow Institute of Physics and Technology, Institutskiy Pereulok 9, 141700 Dolgoprudny, Moscow Region, Russia
| | - T F M Luxford
- Department of Dynamics of Molecules and Clusters, J. Heyrovský Institute of Physical Chemistry of Czech Academy of Sciences, Dolejškova 3, 18223 Prague 8, Czech Republic
| | - J Kočišek
- Department of Dynamics of Molecules and Clusters, J. Heyrovský Institute of Physical Chemistry of Czech Academy of Sciences, Dolejškova 3, 18223 Prague 8, Czech Republic
| | - J Fedor
- Department of Dynamics of Molecules and Clusters, J. Heyrovský Institute of Physical Chemistry of Czech Academy of Sciences, Dolejškova 3, 18223 Prague 8, Czech Republic
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7
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Pshenichnyuk SA, Modelli A, Asfandiarov NL, Rakhmeyev RG, Safronov AM, Tayupov MM, Komolov AS. Microsecond dynamics of molecular negative ions formed by low-energy electron attachment to fluorinated tetracyanoquinodimethane. J Chem Phys 2021; 155:184301. [PMID: 34773960 DOI: 10.1063/5.0072264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Low-energy (0-15 eV) electron interactions with gas-phase 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4-TCNQ) molecules are studied under single collision conditions using dissociative electron attachment spectroscopy. The experimental findings are supported by density functional theory calculations of the virtual orbital energies and energetics of the dissociative decays. Long-lived molecular negative ions F4-TCNQ- are detected in a wide electron energy range (0-3 eV) with electron detachment times in the range of milliseconds. Although plenty of decay channels are observed, their intensities are found to be very small (two to four orders of magnitude relative to the F4-TCNQ- signal). These findings prove that the structure of this strong electron-accepting molecule bearing an excess electron is robust in its electronic ground state, even when highly (up to 6 eV) vibrationally excited. As many as nine metastable fragment anions formed slowly (in the 16-23 µs range) are found in the negative ion mass spectrum of F4-TCNQ, as never observed before in compounds possessing high electron-accepting ability. The present results shed some light on microsecond dynamics of isolated F4-TCNQ molecules under conditions of excess negative charge, which are important for understanding the functionality of nanoscale devices containing this molecule as a structural element.
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Affiliation(s)
- Stanislav A Pshenichnyuk
- Institute of Molecule and Crystal Physics, Ufa Federal Research Centre, Russian Academy of Sciences, Prospekt Oktyabrya 151, 450075 Ufa, Russia
| | - Alberto Modelli
- Università di Bologna, Centro Interdipartimentale di Ricerca in Scienze Ambientali, via S. Alberto 163, 48123 Ravenna, Italy
| | - Nail L Asfandiarov
- Institute of Molecule and Crystal Physics, Ufa Federal Research Centre, Russian Academy of Sciences, Prospekt Oktyabrya 151, 450075 Ufa, Russia
| | - Rustam G Rakhmeyev
- Institute of Molecule and Crystal Physics, Ufa Federal Research Centre, Russian Academy of Sciences, Prospekt Oktyabrya 151, 450075 Ufa, Russia
| | - Aleksey M Safronov
- Institute of Molecule and Crystal Physics, Ufa Federal Research Centre, Russian Academy of Sciences, Prospekt Oktyabrya 151, 450075 Ufa, Russia
| | - Mansaf M Tayupov
- Institute of Molecule and Crystal Physics, Ufa Federal Research Centre, Russian Academy of Sciences, Prospekt Oktyabrya 151, 450075 Ufa, Russia
| | - Alexei S Komolov
- St. Petersburg State University, Universitetskaya nab. 7/9, 199034 St. Petersburg, Russia
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8
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Khatymov RV, Terentyev AG. Resonant electron capture negative ion mass spectrometry: the state of the art and the potential for solving analytical problems. Russ Chem Bull 2021. [DOI: 10.1007/s11172-021-3132-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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9
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Luxford TFM, Pshenichnyuk SA, Asfandiarov NL, Perečko T, Falk M, Kočišek J. 5-Nitro-2,4-Dichloropyrimidine as an Universal Model for Low-Energy Electron Processes Relevant for Radiosensitization. Int J Mol Sci 2020; 21:ijms21218173. [PMID: 33142925 PMCID: PMC7662275 DOI: 10.3390/ijms21218173] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Revised: 10/27/2020] [Accepted: 10/27/2020] [Indexed: 01/18/2023] Open
Abstract
We report experimental results of low-energy electron interactions with.
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Affiliation(s)
- Thomas F. M. Luxford
- J. Heyrovský Institute of Physical Chemistry of the Czech Academy of Sciences, Dolejškova 3, 18223 Prague, Czech Republic;
| | - Stanislav A. Pshenichnyuk
- Institute of Molecule and Crystal Physics UFRC RAS, October Avenue 151, 450075 Ufa, Russia;
- Correspondence: (S.A.P.); (M.F.); (J.K.)
| | - Nail L. Asfandiarov
- Institute of Molecule and Crystal Physics UFRC RAS, October Avenue 151, 450075 Ufa, Russia;
| | - Tomáš Perečko
- Institute of Biophysics of the Czech Academy of Sciences, Kralovopolska 135, 612 65 Brno, Czech Republic;
| | - Martin Falk
- Institute of Biophysics of the Czech Academy of Sciences, Kralovopolska 135, 612 65 Brno, Czech Republic;
- Correspondence: (S.A.P.); (M.F.); (J.K.)
| | - Jaroslav Kočišek
- J. Heyrovský Institute of Physical Chemistry of the Czech Academy of Sciences, Dolejškova 3, 18223 Prague, Czech Republic;
- Correspondence: (S.A.P.); (M.F.); (J.K.)
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10
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Pshenichnyuk SA, Modelli A, Asfandiarov NL, Komolov AS. Ionizing radiation and natural constituents of living cells: Low-energy electron interaction with coenzyme Q analogs. J Chem Phys 2020; 153:111103. [PMID: 32962391 DOI: 10.1063/5.0022188] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Resonance electron attachment to short-tail analogs of coenzyme Q10 is investigated in the electron energy range 0 eV-14 eV under gas-phase conditions by means of dissociative electron attachment spectroscopy. Formation of long-lived (milliseconds) molecular negative ions is detected at 1.2 eV, but not at thermal energy. A huge increase in the electron detachment time as compared with the reference para-benzoquinone (40 µs) is ascribed to the presence of the isoprene side chains. Elimination of a neutral CH3 radical is found to be the most intense decay detected on the microsecond time scale. The results give some insight into the timescale of electron-driven processes stimulated in living tissues by high-energy radiation and are of importance in prospective fields of radiobiology and medicine.
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Affiliation(s)
- Stanislav A Pshenichnyuk
- Institute of Molecule and Crystal Physics, Ufa Federal Research Centre, Russian Academy of Sciences, Prospekt Oktyabrya 151, 450075 Ufa, Russia
| | - Alberto Modelli
- Università di Bologna, Dipartimento di Chimica "G. Ciamician", Via Selmi 2, 40126 Bologna, Italy
| | - Nail L Asfandiarov
- Institute of Molecule and Crystal Physics, Ufa Federal Research Centre, Russian Academy of Sciences, Prospekt Oktyabrya 151, 450075 Ufa, Russia
| | - Alexey S Komolov
- St. Petersburg State University, Universitetskaya nab. 7/9, 199034 St. Petersburg, Russia
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11
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Khatymov RV, Shchukin PV, Muftakhov MV, Yakushchenko IK, Yarmolenko OV, Pankratyev EY. A unified statistical RRKM approach to the fragmentation and autoneutralization of metastable molecular negative ions of hexaazatrinaphthylenes. Phys Chem Chem Phys 2020; 22:3073-3088. [PMID: 31965122 DOI: 10.1039/c9cp05397b] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
For the compounds promising for use as n-type semiconductors in organic electronics and energy storage devices, hexaazatrinaphthylene (HATNA) and its derivative hexamethoxy-hexaazatrinaphthylene (HMHATA), the monomolecular processes occurring under the exposure of molecules to low-energy (0-15 eV) free electrons were studied by means of resonant electron capture negative ion mass spectrometry. Resonant electron attachment results in the formation of eminently long-lived molecular negative ions (MNIs) in an abnormally wide range of incident electron energy (Ee) from 0 to 5-7 eV. For both compounds, this observation serves as an indication of the strong electron-accepting properties and high stability of MNIs against electron autodetachment. A weak yield of the only fragment NIs, dehydrogenated anions, was detected for HATNA at Ee > 6 eV. MNIs of HMHATA are less stable to dissociative decay because of the presence of weakly bound terminal substituents. This is evidenced by the mass spectral observation of intense fragmentation occurring above Ee≈ 1 eV and leading to a loss of up to 3 methyl groups as the Ee increases. A series of metastable NI peaks observed in the mass spectra testify to the delayed and sequential nature of fragmentation. Based on the principles of statistical Rice-Ramsperger-Kassel-Marcus (RRKM) theory, the theoretical model of dissociative decay of NIs was developed and then adopted to quantify the rates of ground-state anion decay via electron autodetachment. The experimentally measured electron autodetachment lifetimes and fragmentation rates were best reproduced by the model at molecular adiabatic electron affinities preset to 2.15 eV for HATNA and 1.88 eV for HMHATA, in reasonable agreement with the quantum chemical DFT PBE/3ζ predictions.
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Affiliation(s)
- Rustem V Khatymov
- Institute of Molecule and Crystal Physics, Ufa Federal Research Centre of the Russian Academy of Sciences, Ufa 450075, Russia.
| | - Pavel V Shchukin
- Institute of Molecule and Crystal Physics, Ufa Federal Research Centre of the Russian Academy of Sciences, Ufa 450075, Russia.
| | - Mars V Muftakhov
- Institute of Molecule and Crystal Physics, Ufa Federal Research Centre of the Russian Academy of Sciences, Ufa 450075, Russia.
| | - Igor K Yakushchenko
- Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow Region 142432, Russia
| | - Ol'ga V Yarmolenko
- Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow Region 142432, Russia
| | - Evgeniy Yu Pankratyev
- Institute of Molecule and Crystal Physics, Ufa Federal Research Centre of the Russian Academy of Sciences, Ufa 450075, Russia.
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12
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Goryunkov AA, Asfandiarov NL, Muftakhov MV, Ioffe IN, Solovyeva VA, Lukonina NS, Markov VY, Rakhmeyev RG, Pshenichnyuk SA. Dissociative Electron Attachment to 2,3,6,7,10,11-Hexabromotriphenylene. J Phys Chem A 2020; 124:690-694. [PMID: 31914729 DOI: 10.1021/acs.jpca.9b11088] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
2,3,6,7,10,11-Hexabromotriphenylene (HBTP) and 2,3,6,7,10-pentabromotriphenylene (PBTP) were investigated by means of dissociative electron attachment spectroscopy (DEAS). The dominant decay channel of the transient molecular negative ions consists of elimination of Br- with resonances in the low electron energy region. Formation of long-lived parent anions with autodetachment lifetime τa = 310 μs is observed at thermal electron energies. The adiabatic electron affinities, EAa = 1.12 ± 0.1 eV in HBTP and 1.09 ± 0.1 eV in PBTP, evaluated using a simple Arrhenius approach are in good agreement with those predicted by DFT (XYG3/Def2-TZVPP//PBE0/Def2-TZVPP) calculations.
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Affiliation(s)
- Alexey A Goryunkov
- Department of Chemistry , Lomonosov Moscow State University , Leninskie Gory, 1-3 , Moscow 119991 , Russia
| | - Nail L Asfandiarov
- Institute of Molecule and Crystal Physics , Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences , Prospekt Octyabrya, 151 , Ufa 450075 , Russia
| | - Mars V Muftakhov
- Institute of Molecule and Crystal Physics , Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences , Prospekt Octyabrya, 151 , Ufa 450075 , Russia
| | - Ilya N Ioffe
- Department of Chemistry , Lomonosov Moscow State University , Leninskie Gory, 1-3 , Moscow 119991 , Russia
| | - Vera A Solovyeva
- Department of Chemistry , Lomonosov Moscow State University , Leninskie Gory, 1-3 , Moscow 119991 , Russia
| | - Natalia S Lukonina
- Department of Chemistry , Lomonosov Moscow State University , Leninskie Gory, 1-3 , Moscow 119991 , Russia
| | - Vitaliy Yu Markov
- Department of Chemistry , Lomonosov Moscow State University , Leninskie Gory, 1-3 , Moscow 119991 , Russia
| | - Rustam G Rakhmeyev
- Institute of Molecule and Crystal Physics , Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences , Prospekt Octyabrya, 151 , Ufa 450075 , Russia
| | - Stanislav A Pshenichnyuk
- Institute of Molecule and Crystal Physics , Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences , Prospekt Octyabrya, 151 , Ufa 450075 , Russia
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Pshenichnyuk SA, Asfandiarov NL. Structural rearrangements as relaxation pathway for molecular negative ions formed via vibrational Feshbach resonance. Phys Chem Chem Phys 2020; 22:16150-16156. [PMID: 32638766 DOI: 10.1039/d0cp02647f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The low-energy (0-15 eV) resonance electron interaction with two organic acids, oxaloacetic and α-ketoglutaric, is studied under gas-phase conditions using dissociative electron attachment spectroscopy. The most unexpected observation is the long-lived (microseconds) molecular negative ions formed by thermal electron attachment via the vibrational Feshbach resonance mechanism in both compounds. Unlike oxaloacetic acid, for which only one slow (microseconds) dissociative decay is detected, as many as five metastable negative ions are observed for α-ketoglutaric acid. These results are analyzed using density functional theory calculations and estimations of electron affinity using the experimental electron detachment times. The results are of considerable interest for understanding the fundamental mechanisms responsible for the dynamics of highly excited negative ions and the transformation pathways of biologically relevant molecules stimulated by excess electron attachment.
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Affiliation(s)
- Stanislav A Pshenichnyuk
- Institute of Molecule and Crystal Physics, Ufa Federal Research Centre, Russian Academy of Sciences, Prospekt Oktyabrya 151, 450075 Ufa, Russia.
| | - Nail L Asfandiarov
- Institute of Molecule and Crystal Physics, Ufa Federal Research Centre, Russian Academy of Sciences, Prospekt Oktyabrya 151, 450075 Ufa, Russia.
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Asfandiarov NL, Pshenichnyuk SA, Nafikova EP, Rakhmeyev RG. Dissociative Electron Attachment to 2,6- and 2,5-Dihydroxyacetophenone. JOURNAL OF ANALYTICAL CHEMISTRY 2019. [DOI: 10.1134/s1061934819130021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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15
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Pshenichnyuk SA, Modelli A, Asfandiarov NL, Lazneva EF, Komolov AS. Electron stimulated ring opening in diphenylphthalide dicarboxylic acid: Its likely role in the unique properties of phthalide-based materials. J Chem Phys 2019; 151:214309. [PMID: 31822089 DOI: 10.1063/1.5130152] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The electronic properties of diphenylphthalide dicarboxylic acid (DPDA) are studied under gas-phase conditions using dissociative electron attachment spectroscopy and in the condensed environment by means of total current spectroscopy. The experimental features are assigned with the support of density functional theory calculations of the energies of the lowest-lying anion states to describe both resonances responsible for low-energy (0-15 eV) electron attachment to the isolated molecule and the maxima in the density of unoccupied electronic states in the condensed ultrathin (up to 10 nm) films. Resonance electron attachment to DPDA is found to be followed by the opening of the γ-lactone ring in the molecular negative ions, an unusual mechanism leading to their stabilization. A similar mechanism is expected to be responsible for the unique properties of phthalide-based materials in the condensed state.
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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
| | - Alberto Modelli
- Dipartimento di Chimica "G. Ciamician", Università di Bologna, Via Selmi 2, 40126 Bologna, Italy
| | - Nail L Asfandiarov
- Institute of Molecule and Crystal Physics, Ufa Federal Research Centre, Russian Academy of Sciences, Prospeκt Oktyabrya 151, 450075 Ufa, Russia
| | - 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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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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Khatymov RV, Muftakhov MV, Tuktarov RF, Raitman OA, Shokurov AV, Pankratyev EY. Fragmentation and slow autoneutralization of isolated negative molecular ions of phthalocyanine and tetraphenylporphyrin. J Chem Phys 2019; 150:134301. [PMID: 30954040 DOI: 10.1063/1.5087182] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Macrocyclic tetrapyrrolic compounds, such as naturally occurring or artificial porphyrins and phthalocyanines, have unique and highly attractive properties for applications in medicine and technology. The interaction of free-base phthalocyanine (H2Pc) and tetraphenylporphyrin (H2TPP) molecules with low-energy (0-15 eV) electrons was studied in vacuo by means of negative ion resonant electron capture mass spectrometry. Close similarities in formation and decay of negative ions of these compounds were revealed. Efficient formation of long-lived molecular negative ions (MNIs) was observed in the incident electron energy range of 0-8 eV, unprecedentedly wide for organic compounds and comparable to the range characteristic to carbon atomic clusters, fullerenes. Experiments testify to the strong persistence of MNIs of both compounds to dissociative decay, isomerization, and electron autodetachment. Lifetimes of MNIs as a function of incident electron energy were measured and it was concluded that the isolated anions may retain additional electrons in a time scale of up to hundreds of seconds at standard temperature due to the high adiabatic electron affinity of these large molecules. For the representatives of dyes and photochromic compounds comprehensively studied in terms of interaction with light, the present work highlights yet another unique property of these molecules, namely the capability to attach and durably retain an additional electron of low, pre-ionization energy.
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Affiliation(s)
- Rustem V Khatymov
- Institute of Molecule and Crystal Physics-Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences (IMCP UFRC RAS), Prospekt Oktyabrya 151, Ufa 450075, Russia
| | - Mars V Muftakhov
- Institute of Molecule and Crystal Physics-Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences (IMCP UFRC RAS), Prospekt Oktyabrya 151, Ufa 450075, Russia
| | - Renat F Tuktarov
- Institute of Molecule and Crystal Physics-Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences (IMCP UFRC RAS), Prospekt Oktyabrya 151, Ufa 450075, Russia
| | - Oleg A Raitman
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry of the Russian Academy of Sciences (IPCE RAS), Leninsky prospect, 31k4, Moscow 199071, Russia
| | - Alexander V Shokurov
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry of the Russian Academy of Sciences (IPCE RAS), Leninsky prospect, 31k4, Moscow 199071, Russia
| | - Evgeniy Yu Pankratyev
- Institute of Molecule and Crystal Physics-Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences (IMCP UFRC RAS), Prospekt Oktyabrya 151, Ufa 450075, Russia
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Asfandiarov NL, Pshenichnyuk SA, Rakhmeyev RG, Tuktarov RF, Zaitsev NL, Vorob’ev AS, Kočišek J, Fedor J, Modelli A. 4-Bromobiphenyl: Long-lived molecular anion formation and competition between electron detachment and dissociation. J Chem Phys 2019; 150:114304. [DOI: 10.1063/1.5082611] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Affiliation(s)
- N. L. Asfandiarov
- Institute of Molecule and Crystal Physics UFRC RAS, October Avenue 151, 450075 Ufa, Russia
| | - S. A. Pshenichnyuk
- Institute of Molecule and Crystal Physics UFRC RAS, October Avenue 151, 450075 Ufa, Russia
| | - R. G. Rakhmeyev
- Institute of Molecule and Crystal Physics UFRC RAS, October Avenue 151, 450075 Ufa, Russia
| | - R. F. Tuktarov
- Institute of Molecule and Crystal Physics UFRC RAS, October Avenue 151, 450075 Ufa, Russia
| | - N. L. Zaitsev
- Institute of Molecule and Crystal Physics UFRC RAS, October Avenue 151, 450075 Ufa, Russia
| | - A. S. Vorob’ev
- Moscow Institute of Physics and Technology, Institutskiy Pereulok 9, 141700 Dolgoprudny, Moscow Region, Russia
| | - J. Kočišek
- Department of Dynamics of Molecules and Clusters, J. Heyrovský Institute of Physical Chemistry Academy of Sciences of the Czech Republic, Dolejškova 3, 18223 Prague 8, Czech Republic
| | - J. Fedor
- Department of Dynamics of Molecules and Clusters, J. Heyrovský Institute of Physical Chemistry Academy of Sciences of the Czech Republic, Dolejškova 3, 18223 Prague 8, Czech 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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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, Vorob’ev AS, Asfandiarov NL, Nafikova EP, Rakhmeyev RG, Galeev RV, Komolov AS. Fragmentation of chlorpyrifos by thermal electron attachment: a likely relation to its metabolism and toxicity. Phys Chem Chem Phys 2018; 20:22272-22283. [DOI: 10.1039/c8cp03224f] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The energies of formation and dissociative decays of temporary negative ions of the organophosphorus insecticide chlorpyrifos are studied using electron transmission, dissociative electron attachment spectroscopies and quantum-chemical calculations.
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Affiliation(s)
- Stanislav A. Pshenichnyuk
- Institute of Molecule and Crystal Physics
- Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences
- Ufa 450075
- Russia
| | - Alberto Modelli
- Università di Bologna
- Dipartimento di Chimica “G. Ciamician”
- Bologna 40126
- Italy
- Università di Bologna
| | | | - Nail L. Asfandiarov
- Institute of Molecule and Crystal Physics
- Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences
- Ufa 450075
- Russia
| | - Ekaterina P. Nafikova
- Institute of Molecule and Crystal Physics
- Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences
- Ufa 450075
- Russia
| | - Rustam G. Rakhmeyev
- Institute of Molecule and Crystal Physics
- Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences
- Ufa 450075
- Russia
| | - Rustem V. Galeev
- Institute of Molecule and Crystal Physics
- Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences
- Ufa 450075
- Russia
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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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Asfandiarov NL, Pshenichnyuk SA, Vorob’ev AS, Nafikova EP, Mavrodiev VK, Furlei II, Dokichev VA, Platonov DN, Belyy AY. Estimating electron affinity from the lifetime of negative molecular ions: Cycloheptatriene derivatives. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2017. [DOI: 10.1134/s0036024417050041] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Pshenichnyuk SA, Komolov AS. Why Can Unnatural Electron Acceptors Protect Photosynthesizing Organisms but Kill the Others? J Phys Chem B 2017; 121:749-757. [DOI: 10.1021/acs.jpcb.6b12007] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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
| | - Alexei S. Komolov
- St. Petersburg State University, Universitetskaya nab. 7/9, 199034 St. Petersburg, Russia
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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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Nafikova EP, Asfandiarov NL, Kalimullina LR, El’kin YN. Evaluation of electron affinities of quinone derivatives by density functional theory. Russ Chem Bull 2014. [DOI: 10.1007/s11172-014-0475-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Pshenichnyuk SA, Modelli A, Lazneva EF, Komolov AS. Resonance electron attachment to tetracyanoquinodimethane. J Phys Chem A 2014; 118:6810-8. [PMID: 25121340 DOI: 10.1021/jp505841c] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Resonance interaction of low energy (0-14 eV) electrons with gas-phase 7,7,8,8-tetracyanoquinodimethane (TCNQ) was investigated using dissociative electron attachment (DEA) spectroscopy. Spectral features associated with formation of long-lived TCNQ molecular negative ions are detected at incident electron energies of 0.3, 1.3, and 3.0 eV. A variety of negative fragments is observed around 4 eV, and slow (microseconds) dissociative decay channels are detected at about 3 eV, in competition with simple re-emission of the captured electron. The average electron detachment time from the TCNQ(-) negative ions formed at 3 eV was evaluated to be 250 μs. The experimental findings are interpreted with the support of density functional theory (DFT) calculations of the empty orbital energies, scaled with an empirical equation, and by comparison with earlier electron transmission spectroscopy (ETS) data. A possible mechanism for the unusual formation of long-lived molecular anions above zero energy (up to 3 eV) is briefly discussed. The present results on the interactions between electrons and isolated TCNQ molecules could give more insight into processes observed in TCNQ adsorbates under conditions of excess negative charge. In particular, electron-stimulated surface reactions are hypothesized, likely occurring when condensed TCNQ molecules are exposed to electron beam irradiation.
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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
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Pshenichnyuk SA, Komolov AS. Dissociative Electron Attachment to Anthralin to Model Its Biochemical Reactions. J Phys Chem Lett 2014; 5:2916-2921. [PMID: 26278099 DOI: 10.1021/jz501523s] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The antipsoriatic drug anthralin (dithranol) is known to be extensively accumulated inside mitochondria of keratinocytes and to interact with the electron flow of the respiratory chain. Primary products of the one-electron reduction of polyphenolic anthralin observed in vivo are its dehydrogenated anions, which are formed by H-atom abstraction. The same species are mainly generated at low electron energies by dissociative electron attachment (DEA) to anthralin molecules in vacuo. A likely mechanism for the biochemical transformations of anthralin under reductive conditions in vivo is hypothesized on the basis of its DEA properties. The involvement of excited electronic states generated by ultraviolet irradiation of skin is discussed.
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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
- ‡Physics Faculty, St. Petersburg State University, Uljanovskaja 1, 198504 St. Petersburg, Russia
| | - Alexei S Komolov
- ‡Physics Faculty, St. Petersburg State University, Uljanovskaja 1, 198504 St. Petersburg, Russia
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Asfandiarov NL, Pshenichnyuk SA, Vorob'ev AS, Nafikova EP, Elkin YN, Pelageev DN, Koltsova EA, Modelli A. Electron attachment to some naphthoquinone derivatives: long-lived molecular anion formation. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2014; 28:1580-1590. [PMID: 24895255 DOI: 10.1002/rcm.6934] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Revised: 04/23/2014] [Accepted: 04/27/2014] [Indexed: 06/03/2023]
Abstract
RATIONALE Electron Affinity (EA) is one of the fundamental properties of a molecule. EA values can be measured with various experimental methods, although their availability is still relatively limited. We make an attempt to use Dissociative Electron Attachment Spectroscopy (DEAS) data for evaluation of the EAs of twelve naphthoquinone (NQ) derivatives. METHODS Naphthoquinone (NQ) and eleven of its hydroxyl derivatives were investigated by means of DEAS. A combined investigation of NQ and juglone by means of the Electron Transmission Spectroscopy (ETS) and DEAS techniques, with the support of density functional theory (DFT) calculations, allowed us to elucidate the empty-level structures of NQ and its hydroxyl derivatives. RESULTS All molecules under investigation form extremely long-lived molecular anions associated with three resonant states (except for NQ, where only two long-lived resonances were observed). The hydroxyl substituents of NQ cause an increase in EA and number of internal degrees of freedom (N), and, as a result, an increase in the mean electron autodetachment lifetimes of the molecular negative ions (NIs). Evaluation of the EAs from the measured lifetimes of the molecular NIs through a simple Arrhenius approximation gives results in reasonable agreement with those obtained with DFT calculations. CONCLUSIONS NI lifetime measurements by means of a modified DEAS instrumentation can provide quantitative data of EA. A simple Arrhenius approximation seems to be adequate to describe the process of electron detachment from molecular anions.
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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
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Cheng HY, Huang YS. Temporary anion states of p-benzoquinone: shape and core-excited resonances. Phys Chem Chem Phys 2014; 16:26306-13. [DOI: 10.1039/c4cp03353a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
The energies and lifetimes of shape and core-excited resonances of p-benzoquinone have been studied in this paper. The obtained resonance parameters are of fundamental importance in understanding the bonding and electronic processes of quinones.
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Affiliation(s)
- Hsiu-Yao Cheng
- Department of Chemistry
- Tunghai University
- Taiwan Boulevard Sec. 4, Taiwan, Republic of China
| | - Yu-Shiuan Huang
- Department of Chemistry
- Tunghai University
- Taiwan Boulevard Sec. 4, Taiwan, Republic of China
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Pshenichnyuk SA, Modelli A. Can mitochondrial dysfunction be initiated by dissociative electron attachment to xenobiotics? Phys Chem Chem Phys 2013; 15:9125-35. [PMID: 23646356 DOI: 10.1039/c3cp50614b] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Resonance attachment of low-energy electrons to xenobiotic molecules, 2,4-dichlorophenoxyacetic acid (2,4-D), dichlorodiphenyltrichloroethane (DDT) and dichlorodiphenyldichloroethylene (DDE), was investigated under gas-phase conditions by means of complementary experimental techniques. Electron transmission spectroscopy (ETS) and dissociative electron attachment spectroscopy (DEAS), in the 0-6 eV and 0-15 eV energy range, respectively, were applied with the aim of modeling the behavior of these pesticide molecules under reductive conditions in vivo. Formation of long-lived parent molecular anions and fragment negative ions was observed at incident electron energies very close to zero, in agreement with the results of density functional theory calculations. The gas-phase DEA process, analogous to dissociative electron transfer in solution, was considered as a model for the initial step which occurs in the intermembrane space of mitochondria when a xenobiotic molecule captures an electron "leaked" from the respiratory chain. A possible involvement of the fragments produced by DEA to the pesticides under investigation into cellular processes is discussed. It is concluded that the free radicals and potential DNA adducts formed by DEA are expected to be dangerous for mitochondrial functionalities, while several of the products observed could act as messenger molecules, thus interfering with the normal cellular signaling pathways.
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Affiliation(s)
- Stanislav A Pshenichnyuk
- Institute of Molecule and Crystal Physics, Ufa Research Centre, Russian Academy of Sciences, Ufa, Russia.
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Ómarsson B, Ingólfsson O. Stabilization, fragmentation and rearrangement reactions in low-energy electron interaction with tetrafluoro-para-benzoquinone: a combined theoretical and experimental study. Phys Chem Chem Phys 2013; 15:16758-67. [DOI: 10.1039/c3cp52397g] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Pshenichnyuk SA, Modelli A. Electron attachment to antipyretics: possible implications of their metabolic pathways. J Chem Phys 2012; 136:234307. [PMID: 22779593 DOI: 10.1063/1.4727854] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
The empty-level structures and formation of negative ion states via resonance attachment of low-energy (0-15 eV) electrons into vacant molecular orbitals in a series of non-steroidal anti-inflammatory drugs (NSAIDs), namely aspirin, paracetamol, phenacetin, and ibuprofen, were investigated in vacuo by electron transmission and dissociative electron attachment (DEA) spectroscopies, with the aim to model the behavior of these antipyretic agents under reductive conditions in vivo. The experimental findings are interpreted with the support of density functional theory calculations. The negative and neutral fragments formed by DEA in the gas phase display similarities with the main metabolites of these commonly used NSAIDs generated in vivo by the action of cytochrome P450 enzymes, as well as with several known active agents. It is concluded that xenobiotic molecules which possess pronounced electron-accepting properties could in principle follow metabolic pathways which parallel the gas-phase dissociative decay channels observed in the DEA spectra at incident electron energies below 1 eV. Unwanted side effects as, e.g., hepatoxicity or carcinogenicity produced by the NSAIDs under study in human organism are discussed within the "free radical model" framework, reported earlier to describe the toxic action of the well-known model toxicant carbon tetrachloride.
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Affiliation(s)
- Stanislav A Pshenichnyuk
- Institute of Molecule and Crystal Physics, Ufa Research Centre, Russian Academy of Sciences, Prospekt Oktyabrya 151, 450075 Ufa, Russia.
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