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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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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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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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Khvostenko OG, Khatymova LZ, Lukin VG, Kinzyabulatov RR, Tuimedov GM, Tseplin EE, Tseplina SN. Long-lived negative molecular ions of TCNQ formed by the resonant capture of electrons with above zero energies. Chem Phys Lett 2018. [DOI: 10.1016/j.cplett.2018.09.032] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Kočišek J, Janečková R, Fedor J. Long-lived transient anion of c-C4F8O. J Chem Phys 2018; 148:074303. [DOI: 10.1063/1.5017478] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- J. Kočišek
- J. Heyrovský Institute of Physical Chemistry, Czech Academy of Sciences, Dolejškova 3, 18223 Prague, Czech Republic
| | - R. Janečková
- Department of Chemistry, University of Fribourg, Chemin du Musée 9, CH-1700 Fribourg, Switzerland
| | - J. Fedor
- J. Heyrovský Institute of Physical Chemistry, Czech Academy of Sciences, Dolejškova 3, 18223 Prague, Czech Republic
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Khvostenko OG, Kinzyabulatov RR, Khatymova LZ, Tseplin EE. The Lowest Triplet of Tetracyanoquinodimethane via UV–vis Absorption Spectroscopy with Br-Containing Solvents. J Phys Chem A 2017; 121:7349-7355. [DOI: 10.1021/acs.jpca.7b05623] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Olga G. Khvostenko
- Institute of Molecule and
Crystal Physics, Ufa Research Center of Russian Academy of Sciences, Prospekt Oktyabrya 151, Ufa 450075, Russia
| | - Renat R. Kinzyabulatov
- Institute of Molecule and
Crystal Physics, Ufa Research Center of Russian Academy of Sciences, Prospekt Oktyabrya 151, Ufa 450075, Russia
| | - Laysan Z. Khatymova
- Institute of Molecule and
Crystal Physics, Ufa Research Center of Russian Academy of Sciences, Prospekt Oktyabrya 151, Ufa 450075, Russia
| | - Evgeniy E. Tseplin
- Institute of Molecule and
Crystal Physics, Ufa Research Center of Russian Academy of Sciences, Prospekt Oktyabrya 151, Ufa 450075, Russia
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Bull JN, West CW, Verlet JRR. Anion resonances and above-threshold dynamics of coenzyme Q0. Phys Chem Chem Phys 2015; 17:16125-35. [PMID: 26030180 DOI: 10.1039/c5cp02145f] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Temporary radical anions (resonances) of isolated co enzyme Q0 (CQ0) and their associated above-threshold dynamics have been studied using frequency-, angle-, and time-resolved photoelectron imaging (FAT-PI). Experimental energetics and dynamics are supported with ab initio calculations. All results support that CQ0 exhibits similar resonances and energetics compared with the smaller para-benzoquinone subunit, which is commonly considered as a prototype electrophore for larger biological para-quinone species. However, the above-threshold dynamics in CQ0 relative to para-benzoquinone show significantly enhanced prompt detachment compared with internal conversion, particularly around the photoexcitation energy of 3.10 eV. The change in dynamics can be attributed to a combination of an increase in the shape character of the optically-accessible resonance at this energy, a decrease in the autodetachment lifetime due to the higher density of states in the neutral, and a decrease in the probability that the wavepacket formed in the Franck-Condon window can access the local conical intersection in CQ0 over the timescale of autodetachment. Overall, this study serves as a clear example in understanding the trends in spectroscopy and dynamics in relating a simple prototypical para-quinone electrophore to a more complex biochemical species.
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Affiliation(s)
- James N Bull
- Department of Chemistry, Durham University, South Road, DH1 3LE, UK.
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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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