1
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Rodríguez-Jiménez JA, Carreras A, Casanova D. Small-Occupation Density Functional Correlation Energy Correction to Wave Function Approximations. J Chem Theory Comput 2024. [PMID: 38227943 DOI: 10.1021/acs.jctc.3c01067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2024]
Abstract
In this work, we introduce a novel hybrid approach, termed WFT-soDFT, designed to seamlessly incorporate DFT correlation into wave function ansatzes. This is achieved through a partitioning of the orbital space, distinguishing between large and small natural occupation numbers associated with wave function theory (WFT) and DFT correlation, respectively. The method uses a novel criterion for partitioning the orbital space and mapping the electron density in natural orbitals with a small occupation with the correlation energy of fast electrons within the homogeneous electron gas. Central to our approach is the introduction of a separation parameter ν, the choice of the WFT approach, and the correlation functional. Here, we combine the RASCI wave function with hole and particle truncation with a local density correlation functional to only account for small-occupation correlation energy. We investigate the performance of the method in the study of small but challenging chemical systems, for which WFT-soDFT demonstrates notable improvements over pristine wave function calculations. These findings collectively highlight the potential of the WFT-soDFT approach as a computationally affordable strategy to improve the accuracy of WFT electronic structure calculations.
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Affiliation(s)
- José Aarón Rodríguez-Jiménez
- Donostia International Physics Center (DIPC), 20018 Donostia, Euskadi, Spain
- Polimero eta Material Aurreratuak: Fisika, Kimika eta Teknologia, Kimika Fakultatea, Euskal Herriko Unibertsitatea (UPV/EHU), 20018 Donostia, Euskadi, Spain
| | - Abel Carreras
- Multiverse Computing, 20008 Donostia, Euskadi, Spain
| | - David Casanova
- Donostia International Physics Center (DIPC), 20018 Donostia, Euskadi, Spain
- IKERBASQUE, Basque Foundation for Science, 48009 Bilbao, Euskadi, Spain
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2
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Guo Y, Zhang N, Liu W. SOiCISCF: Combining SOiCI and iCISCF for Variational Treatment of Spin-Orbit Coupling. J Chem Theory Comput 2023; 19:6668-6685. [PMID: 37728243 DOI: 10.1021/acs.jctc.3c00789] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/21/2023]
Abstract
It has recently been shown that the SOiCI approach [Zhang, N.; J. Phys.: Condens. Matter 2022, 34, 224007], in conjunction with the spin-separated exact two-component relativistic Hamiltonian, can provide very accurate fine structures of systems containing heavy elements by treating electron correlation and spin-orbit coupling (SOC) on an equal footing. Nonetheless, orbital relaxations/polarizations induced by SOC are not yet fully accounted for due to the use of scalar relativistic orbitals. This issue can be resolved by further optimizing the still real-valued orbitals self-consistently in the presence of SOC, as done in the spin-orbit coupled CASSCF approach [Ganyushin, D.; et al. J. Chem. Phys. 2013, 138, 104113] but with the iCISCF algorithm [Guo, Y.; J. Chem. Theory Comput. 2021, 17, 7545-7561] for large active spaces. The resulting SOiCISCF employs both double group and time reversal symmetries for computational efficiency and the assignment of target states. The fine structures of p-block elements are taken as showcases to reveal the efficacy of SOiCISCF.
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Affiliation(s)
- Yang Guo
- Qingdao Institute for Theoretical and Computational Sciences, Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, Shandong 266237, China
| | - Ning Zhang
- Beijing National Laboratory for Molecular Sciences, Institute of Theoretical and Computational Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Wenjian Liu
- Qingdao Institute for Theoretical and Computational Sciences, Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, Shandong 266237, China
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3
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Rodríguez-Jiménez JA, Carreras A, Casanova D. Spin-Orbit Couplings of Open-Shell Systems with Restricted Active Space Configuration Interaction. J Phys Chem A 2023; 127:1206-1218. [PMID: 36719861 DOI: 10.1021/acs.jpca.2c08056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
In this work we perform electronic structure calculations to unravel the origin of spin-orbit couplings (SOCs) in open-shell molecules. For that, we select systems displaying di or polyradical character, e.g., trimethylene, and analyze the changes in the magnitude of SOC constants along molecular distortions of ethylene and in the presence of intermolecular interactions between open and closed-shell moieties in the O2-C2H4 system. Calculations were performed by using nonrelativistic wave functions obtained with the restricted active space configuration interaction (RASCI) method, in conjunction with a recent implementation for the calculation of SOC based on the spin-orbit mean field approximation. Our results demonstrate the suitability of RASCI in the calculation of SOCs of open-shell systems, while providing a deep understanding of the relationship between couplings and the nature of the electronic states. Moreover, we introduce a new definition of the SOC constant for the study of molecular aggregates.
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Affiliation(s)
- José Aarón Rodríguez-Jiménez
- Donostia International Physics Center (DIPC), 20018Donostia, Euskadi, Spain.,Kimika Fakultatea, Euskal Herriko Unibertsitatea (UPV/EHU), 20018Donostia, Euskadi, Spain
| | - Abel Carreras
- Donostia International Physics Center (DIPC), 20018Donostia, Euskadi, Spain
| | - David Casanova
- Donostia International Physics Center (DIPC), 20018Donostia, Euskadi, Spain.,IKERBASQUE, Basque Foundation for Science, 48009Bilbao, Euskadi, Spain
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4
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Zhang N, Xiao Y, Liu W. SOiCI and iCISO: combining iterative configuration interaction with spin-orbit coupling in two ways. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:224007. [PMID: 35287124 DOI: 10.1088/1361-648x/ac5db4] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Accepted: 03/14/2022] [Indexed: 06/14/2023]
Abstract
The near-exact iCIPT2 approach for strongly correlated systems of electrons, which stems from the combination of iterative configuration interaction (iCI, an exact solver of full CI) with configuration selection for static correlation and second-order perturbation theory (PT2) for dynamic correlation, is extended to the relativistic domain. In the spirit of spin separation, relativistic effects are treated in two steps: scalar relativity is treated by the infinite-order, spin-free part of the exact two-component (X2C) relativistic Hamiltonian, whereas spin-orbit coupling (SOC) is treated by the first-order, Douglas-Kroll-Hess-like SOC operator derived from the same X2C Hamiltonian. Two possible combinations of iCIPT2 with SOC are considered, i.e., SOiCI and iCISO. The former treats SOC and electron correlation on an equal footing, whereas the latter treats SOC in the spirit of state interaction, by constructing and diagonalizing an effective spin-orbit Hamiltonian matrix in a small number of correlated scalar states. Both double group and time reversal symmetries are incorporated to simplify the computation. Pilot applications reveal that SOiCI is very accurate for the spin-orbit splitting (SOS) of heavy atoms, whereas the computationally very cheap iCISO can safely be applied to the SOS of light atoms and even of systems containing heavy atoms when SOC is largely quenched by ligand fields.
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Affiliation(s)
- Ning Zhang
- Beijing National Laboratory for Molecular Sciences, Institute of Theoretical and Computational Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, People's Republic of China
| | - Yunlong Xiao
- Beijing National Laboratory for Molecular Sciences, Institute of Theoretical and Computational Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, People's Republic of China
| | - Wenjian Liu
- Qingdao Institute for Theoretical and Computational Sciences, Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, Shandong 266237, People's Republic of China
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5
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Bracker M, Dinkelbach F, Weingart O, Kleinschmidt M. Impact of fluorination on the photophysics of the flavin chromophore: a quantum chemical perspective. Phys Chem Chem Phys 2019; 21:9912-9923. [DOI: 10.1039/c9cp00805e] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
10-Methylisoalloxazine (MIA) and its fluorinated derivatives (6-9F-MIA) were investigated by means of quantum chemistry, looking into the influence of fluorination on fluorescence, absorption and inter-system crossing (ISC) in vacuum and in aqueous solution.
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Affiliation(s)
- Mario Bracker
- Institut für Theoretische Chemie und Computerchemie
- Heinrich-Heine-Universität Düsseldorf
- 40225 Düsseldorf
- Germany
| | - Fabian Dinkelbach
- Institut für Theoretische Chemie und Computerchemie
- Heinrich-Heine-Universität Düsseldorf
- 40225 Düsseldorf
- Germany
| | - Oliver Weingart
- Institut für Theoretische Chemie und Computerchemie
- Heinrich-Heine-Universität Düsseldorf
- 40225 Düsseldorf
- Germany
| | - Martin Kleinschmidt
- Institut für Theoretische Chemie und Computerchemie
- Heinrich-Heine-Universität Düsseldorf
- 40225 Düsseldorf
- Germany
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6
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Activation of acetonitrile by gas-phase uranium: bond structure analysis and spin–flip reaction mechanism. Theor Chem Acc 2017. [DOI: 10.1007/s00214-017-2137-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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7
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Dinkelbach F, Kleinschmidt M, Marian CM. Assessment of Interstate Spin–Orbit Couplings from Linear Response Amplitudes. J Chem Theory Comput 2017; 13:749-766. [DOI: 10.1021/acs.jctc.6b01122] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Fabian Dinkelbach
- Institute of Theoretical
and Computational Chemistry, Heinrich Heine University Düsseldorf, Universitätsstr. 1, D-40225 Düsseldorf, Germany
| | - Martin Kleinschmidt
- Institute of Theoretical
and Computational Chemistry, Heinrich Heine University Düsseldorf, Universitätsstr. 1, D-40225 Düsseldorf, Germany
| | - Christel M. Marian
- Institute of Theoretical
and Computational Chemistry, Heinrich Heine University Düsseldorf, Universitätsstr. 1, D-40225 Düsseldorf, Germany
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8
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Wang X, Wang Y, Li S, Zhang Y, Ma P. Theoretical Study on the Reaction Mechanism of Ti with CH3CN in the Gas Phase. J Phys Chem A 2016; 120:5457-63. [PMID: 27367844 DOI: 10.1021/acs.jpca.6b04733] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
To gain a deeper understanding of the reaction mechanisms of Ti with acetonitrile molecules, the triplet and singlet spin-state potential energy surfaces (PESs) has been investigated at B3LYP level of density functional theory (DFT). Crossing points between the different PESs and possible spin inversion processes are discussed by spin-orbit coupling (SOC) calculation. In addition, the bonding properties of the species along the reaction were analyzed by electron localization function (ELF), atoms in molecules (AIM) and natural bond orbital (NBO). The results showed that acetonitrile activation by Ti is a typical spin-forbidden process; larger SOC (by 220.12 cm(-1)) and the possibility of crossing between triplet and singlet imply that intersystem crossing (ISC) would occur near the minimum energy crossing point (MECP) during the transfer of the hydrogen atom.
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Affiliation(s)
- Xiaoli Wang
- College of Chemistry and Chemical Engineering, Northwest Normal University Lanzhou, Gansu 730070, P.R. China
| | - Yongcheng Wang
- College of Chemistry and Chemical Engineering, Northwest Normal University Lanzhou, Gansu 730070, P.R. China
| | - Shuang Li
- College of Chemistry and Chemical Engineering, Northwest Normal University Lanzhou, Gansu 730070, P.R. China
| | - Yuwei Zhang
- College of Chemistry and Chemical Engineering, Northwest Normal University Lanzhou, Gansu 730070, P.R. China
| | - Panpan Ma
- College of Chemistry and Chemical Engineering, Northwest Normal University Lanzhou, Gansu 730070, P.R. China
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9
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Jovanović V, Lyskov I, Kleinschmidt M, Marian CM. On the performance of DFT/MRCI-R and MR-MP2 in spin–orbit coupling calculations on diatomics and polyatomic organic molecules. Mol Phys 2016. [DOI: 10.1080/00268976.2016.1201600] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Vladimir Jovanović
- Institute of Theoretical and Computational Chemistry, Heinrich-Heine-University Düsseldorf, Düsseldorf, Germany
| | - Igor Lyskov
- Institute of Theoretical and Computational Chemistry, Heinrich-Heine-University Düsseldorf, Düsseldorf, Germany
| | - Martin Kleinschmidt
- Institute of Theoretical and Computational Chemistry, Heinrich-Heine-University Düsseldorf, Düsseldorf, Germany
| | - Christel M. Marian
- Institute of Theoretical and Computational Chemistry, Heinrich-Heine-University Düsseldorf, Düsseldorf, Germany
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10
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Sayfutyarova ER, Chan GKL. A state interaction spin-orbit coupling density matrix renormalization group method. J Chem Phys 2016; 144:234301. [DOI: 10.1063/1.4953445] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
| | - Garnet Kin-Lic Chan
- Department of Chemistry, Princeton University, Princeton, New Jersey 08540, USA
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11
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Momeni MR, Brown A. A Local CC2 and TDA-DFT Double Hybrid Study on BODIPY/aza-BODIPY Dimers as Heavy Atom Free Triplet Photosensitizers for Photodynamic Therapy Applications. J Phys Chem A 2016; 120:2550-60. [PMID: 27035753 DOI: 10.1021/acs.jpca.6b02883] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A series of 11 different boron-dipyrromethene (BODIPY) dimers is carefully examined by means of ab initio and Tamm-Dancoff approximated density functional theory methods. Vertical and 0-0 excitation energies along with the tetraradical character of these dimers are determined. Possible application of a series of linked dimers for photodynamic therapy (PDT) was investigated through computing their excitation energies, spin-orbit coupling matrix elements, and singlet-triplet energy gaps. Finally through a systematic investigation of a series of 36 different BODIPY and aza-BODIPY dimers, a new class of near-IR heavy atom free photosensitizers for PDT action is introduced.
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Affiliation(s)
- Mohammad R Momeni
- Department of Chemistry, University of Alberta , Edmonton, Alberta T6G 2G2, Canada
| | - Alex Brown
- Department of Chemistry, University of Alberta , Edmonton, Alberta T6G 2G2, Canada
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12
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Zhang Z. Spin–orbit DFT with analytic gradients and applications to heavy element compounds. Theor Chem Acc 2014. [DOI: 10.1007/s00214-014-1588-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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13
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Marian CM, Nakagawa S, Rai-Constapel V, Karasulu B, Thiel W. Photophysics of flavin derivatives absorbing in the blue-green region: thioflavins as potential cofactors of photoswitches. J Phys Chem B 2014; 118:1743-53. [PMID: 24479961 DOI: 10.1021/jp4098233] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
The purpose of this study was to find flavin derivatives with absorption maxima in the blue-green region of the visible spectrum that might be used as alternative cofactors in blue-light photoreceptors. To this end, the vertical absorption spectra of eight lumiflavin-related compounds were calculated by means of quantum chemical methods. The compounds differ from lumiflavin by the subsitution of an S atom for an O atom at the 2- and/or 4-positions of the isoalloxazine core, the substitution of an N atom for a CH group in the 6- and/or 9-positions, or an extension of the π system at the 7- and 8-positions. For the three most promising compounds, 2-thio-lumiflavin, 4-thio-lumiflavin, and 2,4-dithio-lumiflavin, the quantum chemical investigations were extended to include geometry relaxations in the excited states, rates for spin-forbidden transitions and an estimate of spectral shifts brought about by polar protic environments. We find these thiocarbonyl compounds to have very promising excited-state properties. They absorb in the blue-green wavelength regime around 500 nm, i.e., substantially red-shifted with respect to lumiflavin that is the cofactor of natural blue-light photoreceptors. Their triplet quantum yields are predicted to be close to unity while their triplet lifetimes are long enough to enable bimolecular photochemical reactions. The combination of these properties makes the thioflavins potentially suitable candidates as cofactors in biomimetic photoswitches.
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Affiliation(s)
- Christel M Marian
- Institute of Theoretical and Computational Chemistry, Heinrich Heine University Düsseldorf , Universitätsstr. 1, D-40225 Düsseldorf, Germany
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14
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Szabla R, Góra RW, Sponer J, Sponer JE. Molecular mechanism of diaminomaleonitrile to diaminofumaronitrile photoisomerization: an intermediate step in the prebiotic formation of purine nucleobases. Chemistry 2014; 20:2515-21. [PMID: 24470085 DOI: 10.1002/chem.201304224] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2013] [Indexed: 11/09/2022]
Abstract
The photoinduced isomerization of diaminomaleonitrile (DAMN) to diaminofumaronitrile (DAFN) was suggested to play a key role in the prebiotically plausible formation of purine nucleobases and nucleotides. In this work we analyze two competitive photoisomerization mechanisms on the basis of state-of-the-art quantum-chemical calculations. Even though it was suggested that this process might occur on the triplet potential-energy surface, our results indicate that the singlet reaction channel should not be disregarded either. In fact, the peaked topography of the S1 /S0 conical intersection suggests that the deexcitation should most likely occur on a sub-picosecond timescale and the singlet photoisomerization mechanism might effectively compete even with a very efficient intersystem crossing. Such a scenario is further supported by the relatively small spin-orbit coupling of the S1 and T2 states in the Franck-Condon region, which does not indicate a very effective triplet bypass for this photoreaction. Therefore, we conclude that the triplet reaction channel in DAMN might not be as prominent as was previously thought.
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Affiliation(s)
- Rafał Szabla
- Institute of Biophysics, Academy of Sciences of the Czech Republic, Královopolská 135, 61265 Brno (Czech Republic).
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15
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Etinski M, Tatchen J, Marian CM. Thermal and solvent effects on the triplet formation in cinnoline. Phys Chem Chem Phys 2014; 16:4740-51. [DOI: 10.1039/c3cp53247j] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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16
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Lv L, Wang X, Zhu Y, Liu X, Huang X, Wang Y. Theoretical Study on the Two-State Reaction Mechanism for the Formation of a Pyridin-2-one Cobalt Complex from Cobaltacyclopentadiene and Isocyanate. Organometallics 2013. [DOI: 10.1021/om400301y] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- LingLing Lv
- College of Life Science and Chemistry, Tianshui Normal University, Tianshui,
Gansu 741001, People’s Republic of China
| | - XiaoFang Wang
- College of Life Science and Chemistry, Tianshui Normal University, Tianshui,
Gansu 741001, People’s Republic of China
| | - YuanCheng Zhu
- College of Life Science and Chemistry, Tianshui Normal University, Tianshui,
Gansu 741001, People’s Republic of China
| | - XinWen Liu
- College of Life Science and Chemistry, Tianshui Normal University, Tianshui,
Gansu 741001, People’s Republic of China
| | - XianQiang Huang
- Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, School of Chemistry & Chemical Engineering, Liaocheng University, Liaocheng 252059, People’s Republic of China
| | - YongCheng Wang
- College of Chemistry and Chemical
Engineering, Northwest Normal University, LanZhou, Gansu 730070, People’s Republic of China
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17
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Lü L, Zhu Y, Wang X, Zuo G, Guo F, Zhao S, Wang Y. Spin-orbit coupling and zero-field splitting of the high-spin ferric enzyme-substrate complex: Protocatechuate 3,4-dioxygenase complexed with 3,4-dihydroxyphenylacetate. CHINESE SCIENCE BULLETIN-CHINESE 2013. [DOI: 10.1007/s11434-012-5316-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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18
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Orozco-Gonzalez Y, Coutinho K, Peon J, Canuto S. Theoretical study of the absorption and nonradiative deactivation of 1-nitronaphthalene in the low-lying singlet and triplet excited states including methanol and ethanol solvent effects. J Chem Phys 2012; 137:054307. [DOI: 10.1063/1.4738757] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
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19
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Pohler L, Kleinschmidt M, Etinski M, Marian CM. In search of the dark state of 5-methyl-2-hydroxypyrimidine using a numerical DFT/MRCI gradient. Mol Phys 2012. [DOI: 10.1080/00268976.2012.695030] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Larissa Pohler
- a Institute of Theoretical and Computational Chemistry , Heinrich-Heine-University Düsseldorf , Universitätsstraße 1, 40225 Düsseldorf , Germany
| | - Martin Kleinschmidt
- a Institute of Theoretical and Computational Chemistry , Heinrich-Heine-University Düsseldorf , Universitätsstraße 1, 40225 Düsseldorf , Germany
| | - Mihajlo Etinski
- b Faculty of Physical Chemistry , University of Belgrade , Studentski Trg 12-16, 11000 Belgrade , Serbia
| | - Christel M. Marian
- a Institute of Theoretical and Computational Chemistry , Heinrich-Heine-University Düsseldorf , Universitätsstraße 1, 40225 Düsseldorf , Germany
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20
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Theoretical study of spin-orbit coupling and intersystem crossing in the two-state reaction between Nb(NH2)3 and N2O. Sci China Chem 2012. [DOI: 10.1007/s11426-011-4468-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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21
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Spin-orbit coupling and intersystem crossing in molecules. WILEY INTERDISCIPLINARY REVIEWS-COMPUTATIONAL MOLECULAR SCIENCE 2011. [DOI: 10.1002/wcms.83] [Citation(s) in RCA: 412] [Impact Index Per Article: 31.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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22
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23
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Küpper B, Kleinschmidt M, Schaper K, Marian CM. On the Photophysics of 1,6-Diphenyl-1,3,5-Hexatriene Isomers and Rotamers. Chemphyschem 2011; 12:1872-9. [DOI: 10.1002/cphc.201001068] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2010] [Indexed: 11/08/2022]
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24
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Penfold T, Worth G. The effect of molecular distortions on spin–orbit coupling in simple hydrocarbons. Chem Phys 2010. [DOI: 10.1016/j.chemphys.2010.07.019] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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25
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Theoretical study of spin–orbit coupling and kinetics in spin-forbidden reaction between Ta(NH2)3 and N2O. Theor Chem Acc 2010. [DOI: 10.1007/s00214-010-0739-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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26
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Etinski M, Marian CM. Overruling the energy gap law: fast triplet formation in 6-azauracil. Phys Chem Chem Phys 2010; 12:15665-71. [DOI: 10.1039/c0cp00106f] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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27
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Etinski M, Fleig T, Marian CM. Intersystem Crossing and Characterization of Dark States in the Pyrimidine Nucleobases Uracil, Thymine, and 1-Methylthymine. J Phys Chem A 2009; 113:11809-16. [DOI: 10.1021/jp902944a] [Citation(s) in RCA: 94] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Mihajlo Etinski
- Institute of Theoretical and Computational Chemistry, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
| | - Timo Fleig
- Institute of Theoretical and Computational Chemistry, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
| | - Christel M. Marian
- Institute of Theoretical and Computational Chemistry, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
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28
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Salzmann S, Martinez-Junza V, Zorn B, Braslavsky SE, Mansurova M, Marian CM, Gärtner W. Photophysical Properties of Structurally and Electronically Modified Flavin Derivatives Determined by Spectroscopy and Theoretical Calculations. J Phys Chem A 2009; 113:9365-75. [DOI: 10.1021/jp905724b] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Susanne Salzmann
- Institute of Theoretical and Computational Chemistry, Heinrich Heine University, Düsseldorf, Universitätsstrasse 1, Geb. 26.32, 40225 Düsseldorf, Germany, and Max-Planck-Institute for Bioinorganic Chemistry, Postfach 101365, 45410 Mülheim an der Ruhr, Germany
| | - Víctor Martinez-Junza
- Institute of Theoretical and Computational Chemistry, Heinrich Heine University, Düsseldorf, Universitätsstrasse 1, Geb. 26.32, 40225 Düsseldorf, Germany, and Max-Planck-Institute for Bioinorganic Chemistry, Postfach 101365, 45410 Mülheim an der Ruhr, Germany
| | - Björn Zorn
- Institute of Theoretical and Computational Chemistry, Heinrich Heine University, Düsseldorf, Universitätsstrasse 1, Geb. 26.32, 40225 Düsseldorf, Germany, and Max-Planck-Institute for Bioinorganic Chemistry, Postfach 101365, 45410 Mülheim an der Ruhr, Germany
| | - Silvia E. Braslavsky
- Institute of Theoretical and Computational Chemistry, Heinrich Heine University, Düsseldorf, Universitätsstrasse 1, Geb. 26.32, 40225 Düsseldorf, Germany, and Max-Planck-Institute for Bioinorganic Chemistry, Postfach 101365, 45410 Mülheim an der Ruhr, Germany
| | - Madina Mansurova
- Institute of Theoretical and Computational Chemistry, Heinrich Heine University, Düsseldorf, Universitätsstrasse 1, Geb. 26.32, 40225 Düsseldorf, Germany, and Max-Planck-Institute for Bioinorganic Chemistry, Postfach 101365, 45410 Mülheim an der Ruhr, Germany
| | - Christel M. Marian
- Institute of Theoretical and Computational Chemistry, Heinrich Heine University, Düsseldorf, Universitätsstrasse 1, Geb. 26.32, 40225 Düsseldorf, Germany, and Max-Planck-Institute for Bioinorganic Chemistry, Postfach 101365, 45410 Mülheim an der Ruhr, Germany
| | - Wolfgang Gärtner
- Institute of Theoretical and Computational Chemistry, Heinrich Heine University, Düsseldorf, Universitätsstrasse 1, Geb. 26.32, 40225 Düsseldorf, Germany, and Max-Planck-Institute for Bioinorganic Chemistry, Postfach 101365, 45410 Mülheim an der Ruhr, Germany
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The photophysics of flavins: What makes the difference between gas phase and aqueous solution? J Photochem Photobiol A Chem 2008. [DOI: 10.1016/j.jphotochem.2008.03.015] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Tatchen J, Kleinschmidt M, Marian CM, Parac M, Grimme S. Quantum Chemical Investigation of Spin-Forbidden Transitions in Dithiosuccinimide. ACTA ACUST UNITED AC 2008. [DOI: 10.1524/zpch.217.3.205.20464] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract
The vertical and adiabatic electronic spectra of dithiosuccinimide have been investigated by means of multi-reference Møller–Plesset perturbation theory and combined densitiy functional/multi-reference configuration interaction methods. Geometries of the electronic ground state and several low-lying excited states have been optimised at the level of time-dependent density functional theory. We have determined spin-orbit coupling for correlated wavefunctions utilising a non-empirical spin-orbit mean-field approach. Because of the two thiocarbonyl groups present in the molecule, dithiosuccinimide exhibits a dense spectrum of low-lying valence states. The first two excited singlet states (S
1 and S
2) originate from n → π* excitations. Nearby, three triplet states are located, two n → π* states (T
1 and T
2), and a π → π* triplet excitation (T
3). The experimentally observed strong absorption band with maximum at 3.96 eV arises from the π → π* excited 1
B
2 (S
3) state. Computed radiative lifetimes are presented for the experimentally known phosphorescence from the n → π* excited T
1 state. Further, we find nearly equal probabilities for the spin-forbidden S
0 → T
2 and the spin-allowed S
0 → S
1 transitions in absorption. On these grounds, we assign band number 3 in the spectra measured by Meskers et al. [J. Phys. Chem.
99 (1995) 1134] to this spin-forbidden transition.
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31
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Isobe H, Yamanaka S, Kuramitsu S, Yamaguchi K. Regulation Mechanism of Spin−Orbit Coupling in Charge-Transfer-Induced Luminescence of Imidazopyrazinone Derivatives. J Am Chem Soc 2007; 130:132-49. [DOI: 10.1021/ja073834r] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hiroshi Isobe
- Department of Chemistry and Department of Biological Sciences, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Syusuke Yamanaka
- Department of Chemistry and Department of Biological Sciences, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Seiki Kuramitsu
- Department of Chemistry and Department of Biological Sciences, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Kizashi Yamaguchi
- Department of Chemistry and Department of Biological Sciences, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
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Kleinschmidt M, Tatchen J, Marian CM. SPOCK.CI: A multireference spin-orbit configuration interaction method for large molecules. J Chem Phys 2006; 124:124101. [PMID: 16599656 DOI: 10.1063/1.2173246] [Citation(s) in RCA: 90] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
We present SPOCK.CI, a selecting direct multireference spin-orbit configuration interaction (MRSOCI) program based on configuration state functions. It constitutes an extension of the spin-free density functional theory/multireference configuration interaction (DFT/MRCI) code by Grimme and Waletzke [J. Chem. Phys. 111, 5645 (1999)] and includes spin-orbit interaction on the same footing with electron correlation. Key features of SPOCK.CI are a fast determination of coupling coefficients between configuration state functions, the use of a nonempirical effective one-electron spin-orbit atomic mean-field Hamiltonian, the application of a resolution-of-the-identity approximation to computationally expensive spin-free four-index integrals, and the use of an efficient multiroot Davidson diagonalization scheme for the complex Hamiltonian matrix. SPOCK.CI can be run either in ab initio mode or as semiempirical procedure combined with density functional theory (DFT/MRSOCI). The application of these techniques and approximations makes it possible to compute spin-dependent properties of large molecules in ground and electronically excited states efficiently and with high confidence. Second-order properties such as phosphorescence rates are known to converge very slowly when evaluated perturbationally by sum-over-state approaches. We have investigated the performance of SPOCK.CI on these properties in three case studies on 4H-pyran-4-thione, dithiosuccinimide, and free-base porphin. In particular, we have studied the dependence of the computed phosphorescence lifetimes on various technical parameters of the MRSOCI wave function such as the size of the configuration space, selection of single excitations, diagonalization thresholds, etc. The results are compared to the outcome of extensive quasidegenerate perturbation theory (QDPT) calculations as well as experiment. In all three cases, the MRSOCI approach is found to be superior to the QDPT expansion and yields results in very good agreement with experimental findings. For molecules up to the size of free-base porphin, MRSOCI calculations can easily be run on a single-processor personal computer. Total CPU times for the evaluation of the electronic excitation spectrum and the phosphorescence lifetime of this molecule are below 40 h.
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Affiliation(s)
- Martin Kleinschmidt
- Institute of Theoretical and Computational Chemistry, Heinrich Heine University, Universitätsstrasse 1, D-40225 Düsseldorf, Germany
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34
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Snyder PA, Atanasova S, Hansen RWC. Ethylene. Experimental Evidence for New Assignments of Electronic Transitions in the π → π* Energy Region. Absorption and Magnetic Circular Dichroism Measurements with Synchrotron Radiation. J Phys Chem A 2004. [DOI: 10.1021/jp030837r] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Patricia Ann Snyder
- Department of Chemistry and Biochemistry, Florida Atlantic University, Boca Raton, Florida 33431
| | - Sylvia Atanasova
- Department of Chemistry and Biochemistry, Florida Atlantic University, Boca Raton, Florida 33431
| | - Roger W. C. Hansen
- Synchrotron Radiation Center, University of WisconsinMadison, 3731 Schneider Drive, Stoughton, Wisconsin 53589
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Brownridge S, Grein F, Tatchen J, Kleinschmidt M, Marian CM. Efficient calculation of electron paramagnetic resonance g-tensors by multireference configuration interaction sum-over-state expansions, using the atomic mean-field spin–orbit method. J Chem Phys 2003. [DOI: 10.1063/1.1569243] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
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36
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Shiota Y, Yoshizawa K. A spin–orbit coupling study on the spin inversion processes in the direct methane-to-methanol conversion by FeO+. J Chem Phys 2003. [DOI: 10.1063/1.1557192] [Citation(s) in RCA: 87] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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37
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Kondo M, Shiota Y, Yoshizawa K. Possible Photoinduced Spin Transitions in Bis(phenylmethylenyl)[2.2]paracyclophanes. A Spin−Orbit Coupling Study. J Phys Chem A 2002. [DOI: 10.1021/jp020984+] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Masakazu Kondo
- Institute for Fundamental Research of Organic Chemistry, Kyushu University, Fukuoka 812-8581, Japan
| | - Yoshihito Shiota
- Institute for Fundamental Research of Organic Chemistry, Kyushu University, Fukuoka 812-8581, Japan
| | - Kazunari Yoshizawa
- Institute for Fundamental Research of Organic Chemistry, Kyushu University, Fukuoka 812-8581, Japan
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García-Expósito E, Bearpark MJ, Ortuño RM, Branchadell V, Robb MA, Wilsey S. The T(1) (3)(pi-pi*)/S(0) intersections and triplet lifetimes of cyclic alpha,beta-enones. J Org Chem 2001; 66:8811-4. [PMID: 11749611 DOI: 10.1021/jo015865p] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The ground and triplet excited states of cycloheptenone, cyclohexenone, and cyclopentenone have been studied using CASSCF calculations. For these three molecules, the difference in energy (DeltaE) between the twisted T(1) (3)(pi-pi*) minimum and T(1) (3)(pi-pi*)/S(0) intersection increases as the flexibility of the ring decreases. A strong positive correlation between DeltaE and the natural logarithm of the experimentally determined triplet lifetimes (ln tau) is found, suggesting that DeltaE predominantly determines the relative radiationless decay rates of T(1).
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Affiliation(s)
- E García-Expósito
- Department of Chemistry, King's College London, Strand, London WC2R 2LS, U.K
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Tatchen J, Waletzke M, Marian CM, Grimme S. The photophysics of pyranthione: a theoretical investigation focussing on spin-forbidden transitions. Chem Phys 2001. [DOI: 10.1016/s0301-0104(01)00243-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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40
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Qi F, Sorkhabi O, Suits AG, Chien SH, Li WK. Photodissociation of ethylene sulfide at 193 nm: a photofragment translational spectroscopy study with VUV synchrotron radiation and ab initio calculations. J Am Chem Soc 2001; 123:148-61. [PMID: 11273612 DOI: 10.1021/ja003314v] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Photodissociation of ethylene sulfide at 193 nm has been studied using photofragment translational spectroscopy and ab initio theoretical calculations. Tunable synchrotron radiation was used as a universal but selective probe of the reaction products to reveal new aspects of the photodissociation dynamics. The channel giving S + C2H4 was found to be dominated by production of ground-state sulfur atoms (S(3P):S(1D) = 1.44:1), mostly through a spin-forbidden process. The results also suggest the presence of a channel giving S(3P) in conjunction with triplet ethylene C2H4 (3B(1u)) and allow insight into the energy of the latter species near its equilibrium geometry, in which the two methylene groups occupy perpendicular planes. In addition, a channel leading to the production of H2S with C2H2 also has been observed. Our experimental results are supported and elaborated by theoretical calculations.
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Affiliation(s)
- F Qi
- Chemical Sciences Division, Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
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41
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García-Expósito E, González-Moreno R, Martín-Vilà M, Muray E, Rifé J, Bourdelande JL, Branchadell V, Ortuño RM. On the Z-E photoisomerization of chiral 2-pentenoate esters: stationary irradiations, laser-flash photolysis studies, and theoretical calculations. J Org Chem 2000; 65:6958-65. [PMID: 11031016 DOI: 10.1021/jo000549g] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Chiral pentenoates 1-3 in both Z and E isomeric forms underwent stationary irradiations in several solvents and in the presence of different photosensitizers. The photostationary-state ratio has been determined for each Z/E couple showing a predominance of the thermodynamically more stable isomer for 1 and 3. Moreover, transient species were generated by pulsed laser excitation and detected by their characteristic ultraviolet absorptions, being the first time that enoate-originated triplets are detected. Stern-Volmer quenching studies afforded a quantitative measure for the efficiency of the photosensitization processes induced by benzophenone or acetophenone and allowed the determination of the corresponding quenching rate constants. Density functional calculations permitted the determination of the geometries and the energies of the diastereomeric excited states. Two diastereomeric orthogonal and two diastereomeric planar structures result as a consequence of the presence of a chiral substituent. The orthogonal triplets are the energy minima in all cases, whereas the planar triplets are the transition states linking these orthogonal structures, the corresponding energy barriers being 8-10 kcal mol(-1) for enoates 1-3. The computed S(0) to T(1) excitation energies show a trend which is consistent with the quenching rate constants. On the other hand, the triplet lifetimes determined for 1 and 2 are unusually long (1-20 micros) if compared with the data already described for several enones, in the range of nanoseconds. This fact has been rationalized from calculations of spin-orbit coupling at several points of the T(1) potential energy surface. This coupling is maximum for structures with a torsional angle close to 45 degrees, which are 4-5 kcal mol(-1) above the minima of T(1). Calculations done on the hypothetical aldehyde 4 and methyl vinyl ketone show much lower energy barriers, thus accounting for the shorter lifetimes reported for enone triplets.
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Affiliation(s)
- E García-Expósito
- Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
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42
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Woeller M, Grimme S, Peyerimhoff SD, Danovich D, Filatov M, Shaik S. A Theoretical Study of the Radiationless Decay Mechanism of Cyclic Alkenes in the Lowest Triplet State. J Phys Chem A 2000. [DOI: 10.1021/jp0003398] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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43
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Berger R, Quack M. Multiconfiguration linear response approach to the calculation of parity violating potentials in polyatomic molecules. J Chem Phys 2000. [DOI: 10.1063/1.480900] [Citation(s) in RCA: 96] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
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44
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Janaway GA, Brauman JI. Direct Observation of Spin Forbidden Proton-Transfer Reactions: 3NO- + HA → 1HNO + A-. J Phys Chem A 2000. [DOI: 10.1021/jp992511h] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Gordon A. Janaway
- Department of Chemistry Stanford University, Stanford, California 94305-5080
| | - John I. Brauman
- Department of Chemistry Stanford University, Stanford, California 94305-5080
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45
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46
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Tatchen J, Marian CM. On the performance of approximate spin–orbit Hamiltonians in light conjugated molecules: the fine-structure splitting of HC6H+, NC5H+, and NC4N+. Chem Phys Lett 1999. [DOI: 10.1016/s0009-2614(99)00997-5] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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47
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Filatov M, Shaik S. Tetramethyleneethane (TME) Diradical: Experiment and Density Functional Theory Reach an Agreement. J Phys Chem A 1999. [DOI: 10.1021/jp9920489] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Michael Filatov
- Department of Organic Chemistry and The Lise Meitner-Minerva Center for Computational Quantum Chemistry, The Hebrew University of Jerusalem, 91904 Jerusalem, Israel
| | - Sason Shaik
- Department of Organic Chemistry and The Lise Meitner-Minerva Center for Computational Quantum Chemistry, The Hebrew University of Jerusalem, 91904 Jerusalem, Israel
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48
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Bakasov A, Quack M. Representation of parity violating potentials in molecular main chiral axes. Chem Phys Lett 1999. [DOI: 10.1016/s0009-2614(99)00238-9] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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