1
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Parsons BF, Hulce MR, Ackerman JR, Reardon KA, Pappas ES, Kettler LE. Ultraviolet Excitation of M-O 2 (M = Phenalenone, Fluorenone, Pyridine, & Acridine) Complexes Resulting in 1O 2. J Phys Chem A 2024; 128:2971-2981. [PMID: 38579334 DOI: 10.1021/acs.jpca.4c00143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/07/2024]
Abstract
In our experiment, a trace amount of an organic molecule (M = 1H-phenalen-1-one, 9-fluorenone, pyridine, or acridine) was seeded into a gas mix consisting of 3% O2 with a rare gas buffer (He or Ar) and then supersonically expanded. We excited the resulting molecular beam with ultraviolet light at either 355 nm (1H-phenalen-1-one, 9-fluorenone, or acridine) or 266 nm (pyridine) and used resonance enhanced multiphoton ionization (REMPI) spectroscopy to probe for the formation of O2 in the a-1Δg state, 1O2. For all systems, the REMPI spectra demonstrate that ultraviolet excitation results in the formation of 1O2 and the oxygen product is confirmed to be in the ground vibrational state and with an effective rotational temperature below 80 K. We then recorded the velocity map ion image of the 1O2 product. From the ion images, we determined the center-of-mass translational energy distribution, P(ET), assuming photodissociation of a bimolecular M-O2 complex. We also report results from electronic structure calculations that allow for a determination of the M-O2 ground state binding energy. We use the complex binding energy, the energy to form 1O2, and the adiabatic triplet energy for each organic molecule to determine the available energy following photodissociation. For dissociation of a bimolecular complex, this available energy may be partitioned into either center-of-mass recoil or internal degrees of freedom of the organic moiety. We use the available energy to generate a Prior distribution, which predicts statistical energy partitioning during dissociation. For low available energies, less than 0.2 eV, we find that the statistical prediction is in reasonable agreement with the experimental observations. However, at higher available energies, the experimental distribution is biased to lower center-of-mass kinetic energies compared with the statistical prediction, which suggests the complex undergoes vibrational predissociation.
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Affiliation(s)
- Bradley F Parsons
- Department of Chemistry and Biochemistry 2500 California Plaza, Creighton University, Omaha, Nebraska 68178, United States
| | - Martin R Hulce
- Department of Chemistry and Biochemistry 2500 California Plaza, Creighton University, Omaha, Nebraska 68178, United States
| | - John R Ackerman
- Department of Chemistry and Biochemistry 2500 California Plaza, Creighton University, Omaha, Nebraska 68178, United States
| | - Kylie A Reardon
- Department of Chemistry and Biochemistry 2500 California Plaza, Creighton University, Omaha, Nebraska 68178, United States
| | - Emerson S Pappas
- Department of Chemistry and Biochemistry 2500 California Plaza, Creighton University, Omaha, Nebraska 68178, United States
| | - Lauren E Kettler
- Department of Chemistry and Biochemistry 2500 California Plaza, Creighton University, Omaha, Nebraska 68178, United States
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2
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Chin C, Zhu T, Zhang JZH. Theoretical study of the absorption and emission spectrum and non‐adiabatic excited state dynamics of gas‐phase xanthone. J CHIN CHEM SOC-TAIP 2023. [DOI: 10.1002/jccs.202200422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Chih‐Hao Chin
- School of Chemistry and Molecular Engineering East China Normal University Shanghai China
- NYU‐ECNU Center for Computational Chemistry at NYU Shanghai Shanghai China
| | - Tong Zhu
- School of Chemistry and Molecular Engineering East China Normal University Shanghai China
- NYU‐ECNU Center for Computational Chemistry at NYU Shanghai Shanghai China
| | - John Zeng Hui Zhang
- School of Chemistry and Molecular Engineering East China Normal University Shanghai China
- NYU‐ECNU Center for Computational Chemistry at NYU Shanghai Shanghai China
- Shenzhen Institute of Synthetic Biology and Faculty of Synthetic Biology Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences Shenzhen China
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3
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Metz S, Marian CM. Modulation of Intersystem Crossing by Chemical Composition and Solvent Effects: Benzophenone, Anthrone and Fluorenone. CHEMPHOTOCHEM 2022. [DOI: 10.1002/cptc.202200098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Simon Metz
- Heinrich-Heine-University Düsseldorf Theoretical and Computational Chemistry Universitätsstraße 1 40225 Düsseldorf GERMANY
| | - Christel Maria Marian
- Heinrich-Heine-University Düsseldorf Insitute of Theoretical and Computational Chemistry Universitätsstr. 126.32 40225 Düsseldorf GERMANY
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4
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Dickson‐Karn NM, Celius TC, Williams BW, Napoli J, Black R, Colley KZ, Dunn TF, Shi Y. Investigation of excited‐state deactivation processes in benzofluorenones using time‐resolved transient absorption spectroscopy. J PHYS ORG CHEM 2022. [DOI: 10.1002/poc.4345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Nicole M. Dickson‐Karn
- Department of Chemistry and Biochemistry The Ohio State University Columbus OH 43210 USA
| | - Tevye C. Celius
- Donald J. Bettinger Department of Chemistry and Biochemistry Ohio Northern University Ada OH 45810 USA
| | | | - Joseph Napoli
- Donald J. Bettinger Department of Chemistry and Biochemistry Ohio Northern University Ada OH 45810 USA
| | - Rhys Black
- Donald J. Bettinger Department of Chemistry and Biochemistry Ohio Northern University Ada OH 45810 USA
| | - Kiser Z. Colley
- Donald J. Bettinger Department of Chemistry and Biochemistry Ohio Northern University Ada OH 45810 USA
| | - Timothy F. Dunn
- Donald J. Bettinger Department of Chemistry and Biochemistry Ohio Northern University Ada OH 45810 USA
| | - Yutong Shi
- Donald J. Bettinger Department of Chemistry and Biochemistry Ohio Northern University Ada OH 45810 USA
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5
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Alías-Rodríguez M, de Graaf C, Huix-Rotllant M. Ultrafast Intersystem Crossing in Xanthone from Wavepacket Dynamics. J Am Chem Soc 2021; 143:21474-21477. [PMID: 34905690 DOI: 10.1021/jacs.1c07039] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Most aromatic ketones containing first-row elements undergo unexpectedly fast intersystem crossing in a few tens of picoseconds and a quantum yield close to unity. Among them, xanthone (9H-xanthen-9-one) possesses one of the fastest singlet-triplet rates of only ∼1.5 ps. The exact mechanism of this unusually fast transition is still under debate. Here, we perform wavepacket dynamics of the photochemistry of xanthone in the gas phase and in polar solvents. We show that xanthone follows El-Sayed's rule for intersystem crossing. From the second singlet excited state, the mechanism is sequential: (i) an internal conversion between singlets 1ππ* → 1nπ* (85 fs), (ii) an intersystem crossing 1nπ* → 3ππ* (2.0 ps), and (iii) an internal conversion between triplets 3ππ* → 3nπ* (602 fs). Each transfer finds its origin in a barrierless access to electronic state intersections. These intersections are close to minimum energy structures, allowing for efficient transitions from the initial singlet state to the triplets.
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Affiliation(s)
- Marc Alías-Rodríguez
- Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Marcel·lí Domingo 1, Tarragona 43 007, Spain.,Aix-Marseille Univ, CNRS, ICR, Marseille 13 397, France
| | - Coen de Graaf
- Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Marcel·lí Domingo 1, Tarragona 43 007, Spain.,ICREA, Passeig Lluís Companys 23, Barcelona 08 010, Spain
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6
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Guo H, Ma X, Lei Z, Qiu Y, Zhao J, Dick B. Photophysical properties of N-methyl and N-acetyl substituted alloxazines: a theoretical investigation. Phys Chem Chem Phys 2021; 23:13734-13744. [PMID: 34128506 DOI: 10.1039/d1cp01201k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The electronic structure and photophysical properties of a series of N-methyl and N-acetyl substituted alloxazines (AZs) were investigated with extensive density functional theory (DFT) and time-dependent density functional theory (TD-DFT) based calculations. We showed that non-radiative decays from the lowest singlet and triplet excited states of these AZs are dominant over their radiative counterparts. The fast non-radiative decays of the excited AZs can be attributed to the energy consumption (Ereorg) through structural reorganization facilitated by the intrinsic normal modes of the alloxazine framework, as well as their coupling with those of the functional groups. Substitution with functional groups may lead to further perturbation of the electronic structure of the AZ chromophore, which may enhance intersystem crossing with the ππ* states of the AZs. Due to the different bonding of N1 and N3 within the alloxazine framework, substitution may result in AZs with different photophysical properties. Specifically, functionalization at N1 may help in maintaining or even reducing Ereorg and would promote the absorption and radiative decay from the excited AZs. However, the strong coupling of the vibrational modes of acetyl at N3 with the intrinsic normal modes of the alloxazine framework would contribute significantly to Ereorg, and benefit the non-radiative decay of the excited AZs. We expect that the findings would pave the way for rational design of novel AZs with extraordinary photophysical properties.
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Affiliation(s)
- Huimin Guo
- State Key Laboratory of Fine Chemicals, Department of Chemistry, Dalian University of Technology, No. 2, Linggong Road, Dalian, 116024, P. R. China.
| | - Xiaolin Ma
- State Key Laboratory of Fine Chemicals, Department of Chemistry, Dalian University of Technology, No. 2, Linggong Road, Dalian, 116024, P. R. China.
| | - Zhiwen Lei
- State Key Laboratory of Fine Chemicals, Department of Chemistry, Dalian University of Technology, No. 2, Linggong Road, Dalian, 116024, P. R. China.
| | - Yang Qiu
- State Key Laboratory of Fine Chemicals, Department of Chemistry, Dalian University of Technology, No. 2, Linggong Road, Dalian, 116024, P. R. China.
| | - Jianzhang Zhao
- State Key Laboratory of Fine Chemicals, Department of Chemistry, Dalian University of Technology, No. 2, Linggong Road, Dalian, 116024, P. R. China.
| | - Bernhard Dick
- Institut für Physikalische und Theoretische Chemie, Universität Regensburg, Universitätsstr. 31, Regensburg, 93053, Germany
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7
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Abstract
This review article focuses on the understanding of intersystem crossing (ISC) in molecules. It addresses readers who are interested in the phenomenon of intercombination transitions between states of different electron spin multiplicities but are not familiar with relativistic quantum chemistry. Among the spin-dependent interaction terms that enable a crossover between states of different electron spin multiplicities, spin-orbit coupling (SOC) is by far the most important. If SOC is small or vanishes by symmetry, ISC can proceed by electronic spin-spin coupling (SSC) or hyperfine interaction (HFI). Although this review discusses SSC- and HFI-based ISC, the emphasis is on SOC-based ISC. In addition to laying the theoretical foundations for the understanding of ISC, the review elaborates on the qualitative rules for estimating transition probabilities. Research on the mechanisms of ISC has experienced a major revival in recent years owing to its importance in organic light-emitting diodes (OLEDs). Exemplified by challenging case studies, chemical substitution and solvent environment effects are discussed with the aim of helping the reader to understand and thereby get a handle on the factors that steer the efficiency of ISC.
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Affiliation(s)
- Christel M Marian
- Institute of Theoretical and Computational Chemistry, Heinrich Heine University, Düsseldorf 40204, Germany;
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8
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Karak P, Chakrabarti S. The influence of spin-orbit coupling, Duschinsky rotation and displacement vector on the rate of intersystem crossing of benzophenone and its fused analog fluorenone: a time dependent correlation function based approach. Phys Chem Chem Phys 2020; 22:24399-24409. [PMID: 33084682 DOI: 10.1039/d0cp04713a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
To understand the effect of structural rigidity or flexibility on the intersystem crossing rate, herein we have adopted a time dependent correlation function based approach, an appropriate method for a harmonic oscillator under Condon approximation. Following this technique, we have developed generalized codes for calculating the rate of intersystem crossing (ISC) both at 0 K and at finite temperature. Since the rate of ISC is a measurable quantity, we have separated the real and imaginary parts of the complex correlation function carefully and eliminated the imaginary part by exploiting the odd nature of this function. Using this simplified method, we have calculated the ISC rate constant (kISC) of two molecules, namely, benzophenone and its fused analog, fluorenone. The calculations clearly elucidate that kISC of benzophenone is 103 times larger compared to that of fluorenone. Interestingly, our analyses reveal that the combined effect of spin-orbit coupling and the number of normal modes could increase the rate of ISC of benzophenone by three orders in comparison to that of fluorenone. Furthermore, the Duschinsky rotation matrix (J) and displacement vectors (D) could influence the rate of ISC by one order each, indicating that the overall rate of ISC of benzophenone could have been 105 times higher than that of fluorenone if the latter two factors, namely, J and D have practically no impact on the rate of ISC of fluorenone. However, it has been found that albeit J can't alter the rate of ISC of fluorenone, D indeed can change the rate by two orders, thereby keeping the overall ratio of the rate of ISC of benzophenone and fluorenone as 103. The present study elucidates that none of the above mentioned factors alone can explain the relative rate of ISC of the studied systems; rather a complex interplay between all these factors makes the rate of ISC of benzophenone 103 times higher than that of fluorenone.
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Affiliation(s)
- Pijush Karak
- Department of Chemistry, University of Calcutta, 92 A.P.C Road, Kolkata - 700009, West Bengal, India.
| | - Swapan Chakrabarti
- Department of Chemistry, University of Calcutta, 92 A.P.C Road, Kolkata - 700009, West Bengal, India.
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9
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Guo H, Xia H, Ma X, Chen K, Dang C, Zhao J, Dick B. Efficient Photooxidation of Sulfides with Amidated Alloxazines as Heavy-atom-free Photosensitizers. ACS OMEGA 2020; 5:10586-10595. [PMID: 32426617 PMCID: PMC7227068 DOI: 10.1021/acsomega.0c01087] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Accepted: 04/16/2020] [Indexed: 06/11/2023]
Abstract
Photooxidation utilizing visible light, especially with naturally abundant O2 as the oxygen source, has been well-accepted as a sustainable and efficient procedure in organic synthesis. To ensure the intersystem crossing and triplet quantum yield for efficient photosensitization, we prepared amidated alloxazines (AAs) and investigated their photophysical properties and performance as heavy-atom-free triplet photosensitizers and compared with those of flavin (FL) and riboflavin tetraacetate (RFTA). Because of the difference in the framework structure of AAs and FL and the introduction of carbonyl moiety, the absorption of FL at ∼450 nm is blue-shifted to ∼380 nm and weakened (ε = 8.7 × 103 for FL to ∼6.8 × 103 M-1 cm-1), but the absorption at ∼340 nm is red-shifted to ∼350 nm and enhanced by ∼50% (from ε = 6.4 × 103 for FL to ∼9.9 × 103 M-1 cm-1) in AAs. The intersystem crossing rates from the S1 to T1 are also enhanced in these AAs derivatives, while the fluorescence quantum yield decreases from ∼30 to ∼7% for FL and AAs, respectively, making the triplet excited state lifetime and the singlet oxygen quantum yield of AAs at least comparable to those of FL and RFTA. We examined the performance of these heave-atom-free chromophores in the photooxidation of sulfides to afford sulfoxides. In accordance with the prolonged triplet excited state lifetime and enhanced triplet quantum yield, 2-5-fold performance enhancements were observed for AAs in the photooxidation of sulfides with respect to FL. We proposed that the key reactive oxygen species of AA-sensitized photooxidation are singlet oxygen and superoxide radical anion based on mechanistic investigations. The research highlights the superior performance of AAs in photocatalysis and would be helpful to rationalize the design of efficient heavy-atom-free organic photocatalysts.
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Affiliation(s)
- Huimin Guo
- State
Key Laboratory of Fine Chemicals, Department of Chemistry, Dalian University of Technology, No. 2, Linggong Road, Dalian 116024, P. R. China
| | - Hongyu Xia
- State
Key Laboratory of Fine Chemicals, Department of Chemistry, Dalian University of Technology, No. 2, Linggong Road, Dalian 116024, P. R. China
| | - Xiaolin Ma
- State
Key Laboratory of Fine Chemicals, Department of Chemistry, Dalian University of Technology, No. 2, Linggong Road, Dalian 116024, P. R. China
| | - Kepeng Chen
- State
Key Laboratory of Fine Chemicals, Department of Chemistry, Dalian University of Technology, No. 2, Linggong Road, Dalian 116024, P. R. China
| | - Can Dang
- State
Key Laboratory of Fine Chemicals, Department of Chemistry, Dalian University of Technology, No. 2, Linggong Road, Dalian 116024, P. R. China
| | - Jianzhang Zhao
- State
Key Laboratory of Fine Chemicals, Department of Chemistry, Dalian University of Technology, No. 2, Linggong Road, Dalian 116024, P. R. China
| | - Bernhard Dick
- Institut
für Physikalische und Theoretische Chemie, Universität Regensburg, Universitätsstr. 31, Regensburg 93053, Germany
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10
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Lykhin AO, Varganov SA. Intersystem crossing in tunneling regime: T 1 → S 0 relaxation in thiophosgene. Phys Chem Chem Phys 2020; 22:5500-5508. [PMID: 32101195 DOI: 10.1039/c9cp06956a] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The T1 excited state relaxation in thiophosgene has attracted much attention as a relatively simple model for the intersystem crossing (ISC) transitions in polyatomic molecules. The very short (20-40 ps) T1 lifetime predicted in several theoretical studies strongly disagrees with the experimental values (∼20 ns) indicating that the kinetics of T1 → S0 ISC is not well understood. We use the nonadiabatic transition state theory (NA-TST) with the Zhu-Nakamura transition probability and the multireference perturbation theory (CASPT2) to show that the T1 → S0 ISC occurs in the quantum tunneling regime. We also introduce a new zero-point vibrational energy correction scheme that improves the accuracy of the predicted ISC rate constants at low internal energies. The predicted lifetimes of the T1 vibrational states are between one and two orders of magnitude larger than the experimental values. This overestimation is attributed to the multidimensional nature of quantum tunneling that facilitates ISC transitions along the non-minimum energy path and is not accounted for in the one-dimensional NA-TST.
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Affiliation(s)
- Aleksandr O Lykhin
- Department of Chemistry, University of Nevada, 1664 N. Virginia Street, Reno, Nevada 89557-0216, USA.
| | - Sergey A Varganov
- Department of Chemistry, University of Nevada, 1664 N. Virginia Street, Reno, Nevada 89557-0216, USA.
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11
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Kopkalli Y, Celius TC, Dickson‐Karn NM, Davenport L, Williams BW. The solvatochromic response of benzo[a]fluorenone in aprotic solvents compared with benzo[b]fluorenone and 9‐fluorenone. J PHYS ORG CHEM 2019. [DOI: 10.1002/poc.3994] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Yasemin Kopkalli
- Department of Chemistry & BiochemistryBrooklyn College, The Ph.D. Program in Biochemistry, The Graduate Center, The City University of New York New York
| | - Tevye C. Celius
- Donald J. Bettinger Department of Chemistry & BiochemistryOhio Northern University Ada Ohio
| | | | - Lesley Davenport
- Department of Chemistry & BiochemistryBrooklyn College, The Ph.D. Program in Biochemistry, The Graduate Center, The City University of New York New York
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12
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Gouid Z, Röder A, Cunha de Miranda BK, Gaveau MA, Briant M, Soep B, Mestdagh JM, Hochlaf M, Poisson L. Energetics and ionization dynamics of two diarylketone molecules: benzophenone and fluorenone. Phys Chem Chem Phys 2019; 21:14453-14464. [PMID: 31210192 DOI: 10.1039/c9cp02385b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Single photon ionization and subsequent unimolecular ion decomposition were studied on jet-cooled benzophenone and fluorenone separately, using VUV synchrotron radiation in a photoion/photoelectron coincidence setup. Slow PhotoElectron Spectra (SPES) were recorded in coincidence with either the parent or the fragment ions for hν < 12.5 eV. Dissociative ionization is observed for benzophenone only. The full interpretation of the measurements, including the identification of the neutral and ionic species when dissociative ionization is at play, benefits from high level ab initio computations for determining the equilibrium structures and the energetics of the neutral and ionized molecules and of their fragments. Electronically excited states of the parent molecular ions were calculated also. From this analysis, an accurate experimental determination of the energetics of the benzophenone and fluorenone ions and of their fragmentation channels is available: adiabatic ionization energies of benzophenone at 8.923 ± 0.005 eV and of fluorenone at 8.356 ± 0.007 eV; and appearance energies of benzophenone fragment ions at 11.04 ± 0.02 eV (loss of C6H5), 11.28 ± 0.02 eV (loss of H) and 11.45 ± 0.02 eV (loss of CO). The corresponding fragmentation mechanisms are explored, showing likely concerted bonds rearrangement. Possible pre-ionizing fragmentation is discussed in light of the spectra presented. The structural rigidity of fluorenone diarylketone seems to be the origin of the inhibition of the fragmentation of its cation.
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Affiliation(s)
- Zied Gouid
- Université Paris-Est, Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, 5 bd Descartes, 77454 Marne-la-Vallée, France.
| | - Anja Röder
- LIDYL, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-sur-Yvette, France. and Institute of Physical and Theoretical Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | | | - Marc-André Gaveau
- LIDYL, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-sur-Yvette, France.
| | - Marc Briant
- LIDYL, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-sur-Yvette, France.
| | - Benoît Soep
- LIDYL, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-sur-Yvette, France.
| | - Jean-Michel Mestdagh
- LIDYL, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-sur-Yvette, France.
| | - Majdi Hochlaf
- Université Paris-Est, Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, 5 bd Descartes, 77454 Marne-la-Vallée, France.
| | - Lionel Poisson
- LIDYL, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-sur-Yvette, France.
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13
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Philip AM, Gudem M, Sebastian E, Hariharan M. Decoding the Curious Tale of Atypical Intersystem Crossing Dynamics in Regioisomeric Acetylanthracenes. J Phys Chem A 2019; 123:6105-6112. [DOI: 10.1021/acs.jpca.9b00766] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Abbey M. Philip
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM), Maruthamala P. O., Vithura, Thiruvananthapuram, Kerala 695551, India
| | - Mahesh Gudem
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM), Maruthamala P. O., Vithura, Thiruvananthapuram, Kerala 695551, India
| | - Ebin Sebastian
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM), Maruthamala P. O., Vithura, Thiruvananthapuram, Kerala 695551, India
| | - Mahesh Hariharan
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM), Maruthamala P. O., Vithura, Thiruvananthapuram, Kerala 695551, India
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14
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Skov AB, Larsen MAB, Liisberg MB, Hansen T, Sølling TI. Conformationally controlled ultrafast intersystem crossing in bithiophene systems. Phys Chem Chem Phys 2018; 20:13412-13418. [PMID: 29722398 DOI: 10.1039/c8cp01419a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Bithiophenes serve as model systems for larger polythiophenes used in solar cell applications and molecular electronics. We report a study of ultrafast dynamics of two bithiophene systems measured with femtosecond time-resolved photoelectron spectroscopy, and show that their intersystem crossing takes place within the first few picoseconds after excitation, in line with previous studies. We show that the intersystem crossing rate can be explained in terms of arguments based on symmetry of the S1 minimum energy geometry, which depends on the specific conformation of bithiophene. Furthermore, this work shows that the minor cis-conformer contributes to an even higher intersystem crossing rate than the major trans conformer. The work presented here can provide guiding principles towards the design of solar cell components with even faster formation of long-lived excited states for solar energy harvesting.
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Affiliation(s)
- Anders B Skov
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 København Ø, Denmark.
| | - Martin A B Larsen
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 København Ø, Denmark.
| | - Mikkel B Liisberg
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 København Ø, Denmark.
| | - Thorsten Hansen
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 København Ø, Denmark.
| | - Theis I Sølling
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 København Ø, Denmark.
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15
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Zvereva E, Segarra-Martí J, Marazzi M, Brazard J, Nenov A, Weingart O, Léonard J, Garavelli M, Rivalta I, Dumont E, Assfeld X, Haacke S, Monari A. The effect of solvent relaxation in the ultrafast time-resolved spectroscopy of solvated benzophenone. Photochem Photobiol Sci 2018; 17:323-331. [DOI: 10.1039/c7pp00439g] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Modeling time-resolved spectra to unravel ultra fast solvent reorganization.
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16
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Bhattacherjee A, Pemmaraju CD, Schnorr K, Attar AR, Leone SR. Ultrafast Intersystem Crossing in Acetylacetone via Femtosecond X-ray Transient Absorption at the Carbon K-Edge. J Am Chem Soc 2017; 139:16576-16583. [DOI: 10.1021/jacs.7b07532] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Aditi Bhattacherjee
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
- Chemical
Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Chaitanya Das Pemmaraju
- Theory
Institute for Materials and Energy Spectroscopies, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Kirsten Schnorr
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
- Chemical
Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Andrew R. Attar
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
- Chemical
Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Stephen R. Leone
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
- Chemical
Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
- Department
of Physics, University of California, Berkeley, California 94720, United States
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17
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Rajagopal SK, Mallia AR, Hariharan M. Enhanced intersystem crossing in carbonylpyrenes. Phys Chem Chem Phys 2017; 19:28225-28231. [DOI: 10.1039/c7cp04834c] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Photoexcited state relaxation of carbonylpyrenes displays ultrafast intersystem crossing to generate near-unity triplet formation.
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Affiliation(s)
- Shinaj K. Rajagopal
- School of Chemistry
- Indian Institute of Science Education and Research Thiruvananthapuram
- Thiruvananthapuram 695551
- India
| | - Ajith R. Mallia
- School of Chemistry
- Indian Institute of Science Education and Research Thiruvananthapuram
- Thiruvananthapuram 695551
- India
| | - Mahesh Hariharan
- School of Chemistry
- Indian Institute of Science Education and Research Thiruvananthapuram
- Thiruvananthapuram 695551
- India
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