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Muller G, Catani KJ, Scholz MS, Jacovella U, Bartlett NI, Bieske EJ. Electronic Spectra of Diacetylene Cations (HC 4H +) Tagged with Ar and N 2. J Phys Chem A 2019; 123:7228-7236. [DOI: 10.1021/acs.jpca.9b05996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Giel Muller
- School of Chemistry, University of Melbourne, Parkville, Victoria 3010, Australia
| | - Katherine J. Catani
- School of Chemistry, University of Melbourne, Parkville, Victoria 3010, Australia
| | - Michael S. Scholz
- School of Chemistry, University of Melbourne, Parkville, Victoria 3010, Australia
| | - Ugo Jacovella
- School of Chemistry, University of Melbourne, Parkville, Victoria 3010, Australia
| | - Nastasia I. Bartlett
- School of Chemistry, University of Melbourne, Parkville, Victoria 3010, Australia
| | - Evan J. Bieske
- School of Chemistry, University of Melbourne, Parkville, Victoria 3010, Australia
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Jacovella U, Muller G, Catani KJ, Bartlett NI, Bieske EJ. Electronic Spectra of the Triacetylene Cation (HC6H+) and Protonated Triacetylene (HC6H2+) Tagged with Ar. Aust J Chem 2019. [DOI: 10.1071/ch18508] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Polyacetylene cations (HC2nH+) play important roles in combustion processes and in the chemistry of planetary atmospheres and interstellar clouds. Here we report the electronic spectrum for the triacetylene cation (HC6H+) recorded over the 300–610nm range by photodissociating mass-selected ions tagged with argon atoms in a tandem mass spectrometer. The spectrum shows three band systems that are assigned to (origin transition 16665cm−1), (origin transition 23916cm−1), and (origin transition 29920cm−1). Although the band system is well known, the and band systems are observed for the first time in the gas phase. In addition, the electronic spectrum of the protonated triacteylene cation tagged with an argon atom (HC6-Ar) is reported, providing the first gas-phase spectrum for this species.
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Aranda D, Cerezo J, Pescitelli G, Avila Ferrer FJ, Soto J, Santoro F. A computational study of the vibrationally-resolved electronic circular dichroism spectra of single-chain transoid and cisoid oligothiophenes in chiral conformations. Phys Chem Chem Phys 2018; 20:21864-21880. [PMID: 30105334 DOI: 10.1039/c8cp03482f] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We simulate the vibronic profile of the electronic circular dichroism (ECD) spectra of oligothiophenes in cisoid and transoid chiral arrangements. We consider oligomers of different lengths, from two to fifteen units, and investigate extensively how the ECD spectral shapes depend on the inter-ring torsions. In general, the molecular structures we consider are not stationary points of the ground state potential energy surface. Therefore, in order to perform vibronic calculations, we present a new computational protocol able to define reduced-dimensionality models where the effect of the off-equilibrium modes is removed. This is done adopting a description of the vibrational motions in curvilinear internal coordinates, and vertical harmonic models coupled with an iterative application of projectors to define energy Hessians, and therefore effective normal modes, in the space complementary to the one of the off-equilibrium coordinates. Although we consider both Franck-Condon and Herzberg-Teller contributions, the results show that transoid twisted ribbons always give rise to monosignated ECD spectra, while bi-signated and multi-signated spectra are expected for cisoid helices. These findings are explained on the basis of the different transition strengths of the lowest electronic states imparted by the different spatial arrangement, that is almost linear for transoid structures and more globular for cisoid ones. We predicted the chiroptical response of a large number of possible molecular arrangements. These data are employed to critically discuss the experimental ECD of polythiophenes in different experimental conditions, forming either aggregates or host-guest complexes. The method here proposed to perform vibronic calculations in reduced-dimensionality models is of general applicability and its potential interest goes beyond the practical application presented here.
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Affiliation(s)
- Daniel Aranda
- Department of Physical Chemistry, Faculty of Science, University of Málaga, E-29071-Málaga, Spain
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Koyasu K, Ohtaki T, Bing J, Takahashi K, Misaizu F. Even-odd product variation of the C(n)(+) + D(2) (n = 4-9) reaction: complexity of the linear carbon cation electronic states. Phys Chem Chem Phys 2015; 17:24810-9. [PMID: 26344370 DOI: 10.1039/c5cp04480d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have studied reactions between linear Cn(+) (n = 4-9) and D2, using ion mobility mass spectrometry techniques and quantum chemical calculations in order to understand the complex reactivity of the linear cluster cations. Only linear CnD(+) products were observed for the odd (n = 5, 7, 9) linear clusters, while CnD2(+) was the main product for the even clusters. For the reaction rate constants determined for these two channels, we obtained the following two features: (1) the rate constant decreases with the size n, and (2) even-sized clusters have lower rate constants than neighboring odd-sized clusters. In the theoretical calculations using the CCSD(T) and B3LYP methods with the cc-pVTZ basis, we found that a low lying (2)Σ state in odd clusters may play an important role in these reactions. This opposes the previous interpretation that the (2)Πg/u state is the dominant electronic state for linear Cn(+) (n = 4-9) clusters. We showed that a barrierless radical abstraction forming CnD(+) occurs through a direct head on approach for the (2)Σ state Cn(+). In contrast, a carbene-like insertion forming CnD2(+) occurs through a sideways approach for the (2)Πg/u state Cn(+). We have concluded that the higher rate constants for the odd clusters come from the existence of symmetry broken (2)Σ states which are absent in even linear clusters.
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Affiliation(s)
- K Koyasu
- Department of Chemistry, Graduate School of Science, Tohoku University, Aramaki-Aoba, Aoba-ku, Sendai 980-8578, Japan.
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Bera PP, Peverati R, Head-Gordon M, Lee TJ. Hydrocarbon growth via ion-molecule reactions: computational studies of the isomers of C4H2+, C6H2+ and C6H4+ and their formation paths from acetylene and its fragments. Phys Chem Chem Phys 2015; 17:1859-69. [DOI: 10.1039/c4cp04480k] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Structures, vibrational and electronic spectra, and AIMD trajectories of formation paths for C4H2+, C6H2+ and C6H4+ from acetylene ion and its fragments are reported in this article.
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Affiliation(s)
- Partha P. Bera
- MS 245-6 NASA Ames Research Center
- Moffett Field
- Mountain View
- USA
- Bay Area Environmental Research Institute
| | - Roberto Peverati
- Department of Chemistry
- University of California
- Berkeley
- USA
- Chemical Sciences Division
| | - Martin Head-Gordon
- Department of Chemistry
- University of California
- Berkeley
- USA
- Chemical Sciences Division
| | - Timothy J. Lee
- MS 245-1 NASA Ames Research Center
- Moffett Field
- Mountain View
- USA
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Gronowski M, Kołos R, Krełowski J. A theoretical study on structure and spectroscopy of C4H2+ isomers. Chem Phys Lett 2013. [DOI: 10.1016/j.cplett.2013.07.053] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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7
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Guo X, Cao Z. Low-lying electronic states and their nonradiative deactivation of thieno[3,4-b]pyrazine: an ab initio study. J Chem Phys 2012; 137:224313. [PMID: 23249009 DOI: 10.1063/1.4770229] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
State-averaged complete active space self-consistent field (SA-CASSCF) calculations have been used to locate the four low-lying electronic states of thieno[3,4-b]pyrazine (TP), and their vertical excitation energies and emission energies have been determined by means of the multistate complete active space with second-order perturbation theory (MS-CASPT2) calculations. The present results indicate that the first weak (1)nπ∗ excited state has a C(s)-symmetry structure, unlike two bright (1)ππ∗ excited states in C(2v) symmetry. The predicted vertical excitation energies of the three low-lying excited states in the gas phase are 3.41, 3.92, and 4.13 eV at the restricted-spin coupled-cluster single-double plus perturbative triple excitation [RCCSD(T)] optimized geometry, respectively. On the basis of calculations, a new assignment to the observed spectra of TP was proposed, in which the (1)nπ∗ state should be responsible for the weak absorption centred at 3.54 eV and the two closely spaced (1)ππ∗ states account for the two adjacent absorption bands observed at 3.99 and 4.15 eV. The predicted vertical emission energies lend further support to our assignments. Surface hopping dynamics simulations performed at the SA-CASSCF level suggest that the plausible deactivation mechanism comprises an ultrafast relaxation of the (1)ππ∗ excited states to (1)nπ∗ excited state, followed by a slow conversion to the S(0) ground state via a conical intersection. This internal conversion is accessible, since the MS-CASPT2 predicted energy barrier is ∼0.55 eV, much lower than the Franck-Condon point populated initially under excitation. The dynamical simulations on the low-lying states for 500 fs reveal that the relatively high (1)ππ∗ excited states can be easily trapped in the (1)nπ∗ excited state, which will increase the lifetime of the excited thieno[3,4-b]pyrazine.
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Affiliation(s)
- Xugeng Guo
- State Key Laboratory for Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, People's Republic of China
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Schwell M, Bénilan Y, Fray N, Gazeau MC, Es-Sebbar E, Gaie-Levrel F, Champion N, Leach S. Ionization photophysics and Rydberg spectroscopy of diacetylene. Mol Phys 2012. [DOI: 10.1080/00268976.2012.704084] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Martin Schwell
- a LISA UMR CNRS 7583 , Université Paris Est Créteil and Université Paris Diderot , Institut Pierre Simon Laplace, 61 Avenue du Général de Gaulle, 94010, Créteil , France
| | - Yves Bénilan
- a LISA UMR CNRS 7583 , Université Paris Est Créteil and Université Paris Diderot , Institut Pierre Simon Laplace, 61 Avenue du Général de Gaulle, 94010, Créteil , France
| | - Nicolas Fray
- a LISA UMR CNRS 7583 , Université Paris Est Créteil and Université Paris Diderot , Institut Pierre Simon Laplace, 61 Avenue du Général de Gaulle, 94010, Créteil , France
| | - Marie-Claire Gazeau
- a LISA UMR CNRS 7583 , Université Paris Est Créteil and Université Paris Diderot , Institut Pierre Simon Laplace, 61 Avenue du Général de Gaulle, 94010, Créteil , France
| | - Et Es-Sebbar
- a LISA UMR CNRS 7583 , Université Paris Est Créteil and Université Paris Diderot , Institut Pierre Simon Laplace, 61 Avenue du Général de Gaulle, 94010, Créteil , France
| | - François Gaie-Levrel
- b Synchrotron SOLEIL , L’Orme des Merisiers , St.Aubin, B.P. 48, 91192, Gif-sur-Yvette Cedex , France
- c Laboratoire national de métrologie et d'essais - LNE (National Metrology Institute and Testing Laboratory) , Chemistry and Biology Division, Air Quality and Gaz Flowmetering Department , 1 rue Gaston Boissier, 75724 Paris Cedex 15 , France
| | - Norbert Champion
- d LERMA UMR CNRS 8112 , Observatoire de Paris-Meudon , 5 place Jules-Jansen, 92195, Meudon , France
| | - Sydney Leach
- d LERMA UMR CNRS 8112 , Observatoire de Paris-Meudon , 5 place Jules-Jansen, 92195, Meudon , France
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Guo XG, Zhang JL, Zhao Y. Ab initio characterization of size dependence of electronic spectra for linear anionic carbon clusters C(n) (-) (n = 4-17). J Comput Chem 2012; 33:93-102. [PMID: 21968891 DOI: 10.1002/jcc.21948] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2011] [Revised: 08/19/2011] [Accepted: 08/23/2011] [Indexed: 01/30/2023]
Abstract
In this article, we determine the ground-state equilibrium geometries of the linear anionic carbon clusters C n- (n = 4-17) by means of the density functional theory B3LYP, CAM-B3LYP, and coupled cluster CCSD(T) calculations, as well as their electronic spectra obtained by the multireference second-order perturbation theory CASPT2 method. These studies indicate that these linear anions possess doublet ²∏(g) or ²∏(u) ground state, and the even-numbered clusters are generally acetylenic, whereas the odd-numbered ones are essentially cumulenic. The energy differences, electron affinities, and incremental binding energies of C n- chains all exhibit a notable tread of parity alternation, with n-even chains being more stable than n-odd ones. In addition, the predicted vertical excitation energies from the ground state to four low-lying excited states are in reasonably good agreement with the available experimental observations, and the calculations for the higher excited electronic transitions can provide accurate information for the experimentalists and spectroscopists. Interestingly, the absorption wavelengths of the 1²∏(u/g) ← X²∏(g/u) transitions of the n-even clusters show a nonlinear trend of exponential growth, whereas those of the n-odd counterparts are found to obey a linear relationship as a function of the chain size, as shown experimentally. Moreover, the absorption wavelengths of the transitions to the higher excited states of C n- series have the similar linear size dependence as well.
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Affiliation(s)
- Xu-Geng Guo
- Institute of Environmental and Analytical Sciences, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, People's Republic of China; Department of Chemistry and Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, Xiamen University, Xiamen 361005, People's Republic of China
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Zhao Y, Guo J, Zhang J. A theoretical study of electronic spectra in the linear cationic chains NC2n+1N+ (n=1–6). Chem Phys 2011. [DOI: 10.1016/j.chemphys.2011.05.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Rivera-Fuentes P, Alonso-Gómez JL, Petrovic A, Seiler P, Santoro F, Harada N, Berova N, Rzepa H, Diederich F. Enantiomerically Pure Alleno-Acetylenic Macrocycles: Synthesis, Solid-State Structures, Chiroptical Properties, and Electron Localization Function Analysis. Chemistry 2010; 16:9796-807. [DOI: 10.1002/chem.201001087] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Fulara J, Nagy A, Garkusha I, Maier JP. Higher energy electronic transitions of HC2n+1H+ (n=2–7) and HC2n+1H (n=4–7) in neon matrices. J Chem Phys 2010; 133:024304. [DOI: 10.1063/1.3455208] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Zhang J, Guo X, Cao Z. Erratum: “Electronic spectra of the linear polyyne cations HC2nH+ (n=2–8): An ab initio study” [J. Chem. Phys. 131, 144307 (2009)]. J Chem Phys 2009. [DOI: 10.1063/1.3260843] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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