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Osella S, Paloncýová M, Sahi M, Knippenberg S. Influence of Membrane Phase on the Optical Properties of DPH. Molecules 2020; 25:E4264. [PMID: 32957614 PMCID: PMC7570797 DOI: 10.3390/molecules25184264] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Revised: 09/05/2020] [Accepted: 09/14/2020] [Indexed: 11/24/2022] Open
Abstract
The fluorescent molecule diphenylhexatriene (DPH) has been often used in combination with fluorescence anisotropy measurements, yet little is known regarding the non-linear optical properties. In the current work, we focus on them and extend the application to fluorescence, while paying attention to the conformational versatility of DPH when it is embedded in different membrane phases. Extensive hybrid quantum mechanics/molecular mechanics calculations were performed to investigate the influence of the phase- and temperature-dependent lipid environment on the probe. Already, the transition dipole moments and one-photon absorption spectra obtained in the liquid ordered mixture of sphingomyelin (SM)-cholesterol (Chol) (2:1) differ largely from the ones calculated in the liquid disordered DOPC and solid gel DPPC membranes. Throughout the work, the molecular conformation in SM:Chol is found to differ from the other environments. The two-photon absorption spectra and the ones obtained by hyper-Rayleigh scattering depend strongly on the environment. Finally, a stringent comparison of the fluorescence anisotropy decay and the fluorescence lifetime confirm the use of DPH to gain information upon the surrounding lipids and lipid phases. DPH might thus open the possibility to detect and analyze different biological environments based on its absorption and emission properties.
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Affiliation(s)
- Silvio Osella
- Chemical and Biological Systems Simulation Lab, Centre of New Technologies, University of Warsaw, Banacha 2c, 02-097 Warsaw, Poland
| | - Markéta Paloncýová
- Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacký University Olomouc, 17. listopadu 12, 771 46 Olomouc, Czech Republic;
- Department of Theoretical Chemistry and Biology, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, SE-10691 Stockholm, Sweden;
| | - Maryam Sahi
- Department of Theoretical Chemistry and Biology, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, SE-10691 Stockholm, Sweden;
| | - Stefan Knippenberg
- Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacký University Olomouc, 17. listopadu 12, 771 46 Olomouc, Czech Republic;
- Department of Theoretical Chemistry and Biology, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, SE-10691 Stockholm, Sweden;
- Theory Lab, Hasselt University, Agoralaan Building D, 3590 Diepenbeek, Belgium
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2
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Rodríguez Pirani LS, Cánneva A, Geronés M, Della Védova CO, Romano RM, Cavasso-Filho R, Erben MF. Formation of HCO+ and HCS+ Ions in the Photodissociation of CH3OC(S)SCH3 under VUV Synchrotron Radiation. J Phys Chem A 2019; 123:6674-6682. [DOI: 10.1021/acs.jpca.9b03670] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Lucas S. Rodríguez Pirani
- CEQUINOR (UNLP—CONICET, CCT La Plata, associated with CIC PBA). Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de la Plata. Boulevard 120 e/ 60 y 64 No 1465 CP 1900, La Plata, República Argentina
| | - Antonela Cánneva
- CEQUINOR (UNLP—CONICET, CCT La Plata, associated with CIC PBA). Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de la Plata. Boulevard 120 e/ 60 y 64 No 1465 CP 1900, La Plata, República Argentina
| | - Mariana Geronés
- CEQUINOR (UNLP—CONICET, CCT La Plata, associated with CIC PBA). Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de la Plata. Boulevard 120 e/ 60 y 64 No 1465 CP 1900, La Plata, República Argentina
| | - Carlos O. Della Védova
- CEQUINOR (UNLP—CONICET, CCT La Plata, associated with CIC PBA). Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de la Plata. Boulevard 120 e/ 60 y 64 No 1465 CP 1900, La Plata, República Argentina
| | - Rosana M. Romano
- CEQUINOR (UNLP—CONICET, CCT La Plata, associated with CIC PBA). Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de la Plata. Boulevard 120 e/ 60 y 64 No 1465 CP 1900, La Plata, República Argentina
| | - Reinaldo Cavasso-Filho
- Universidade Federal do ABC, Rua Catequese, 242, CEP: 09090-400, Santo André, São Paulo, Brazil
| | - Mauricio F. Erben
- CEQUINOR (UNLP—CONICET, CCT La Plata, associated with CIC PBA). Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de la Plata. Boulevard 120 e/ 60 y 64 No 1465 CP 1900, La Plata, República Argentina
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3
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Rodríguez Pirani LS, Della Védova CO, Geronés M, Romano RM, Cavasso-Filho R, Ge M, Ma C, Erben MF. Electronic Properties and Dissociative Photoionization of Thiocyanates, Part III. The Effect of the Group’s Electronegativity in the Valence and Shallow-Core (Sulfur and Chlorine 2p) Regions of CCl 3SCN and CCl 2FSCN. J Phys Chem A 2017; 121:9201-9210. [DOI: 10.1021/acs.jpca.7b08395] [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]
Affiliation(s)
- Lucas S. Rodríguez Pirani
- CEQUINOR
(UNLP − CONICET, CCT La Plata), Departamento de Química,
Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Boulevard 120 e/60 y 64 No. 1465, La Plata CP 1900, República Argentina
| | - Carlos O. Della Védova
- CEQUINOR
(UNLP − CONICET, CCT La Plata), Departamento de Química,
Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Boulevard 120 e/60 y 64 No. 1465, La Plata CP 1900, República Argentina
| | - Mariana Geronés
- CEQUINOR
(UNLP − CONICET, CCT La Plata), Departamento de Química,
Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Boulevard 120 e/60 y 64 No. 1465, La Plata CP 1900, República Argentina
| | - Rosana M. Romano
- CEQUINOR
(UNLP − CONICET, CCT La Plata), Departamento de Química,
Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Boulevard 120 e/60 y 64 No. 1465, La Plata CP 1900, República Argentina
| | - Reinaldo Cavasso-Filho
- Universidade Federal do ABC, Rua Catequese,
242, CEP 09090-400 Santo André, São Paulo, Brazil
| | - Maofa Ge
- State
Key Laboratory for Structural Chemistry of Unstable and Stable Species,
Beijing National Laboratory for Molecular Sciences (BNLMS), Institute
of Chemistry, Chinese Academy of Sciences, Beijing 100190, Peoples Republic of China
| | - Chunping Ma
- State
Key Laboratory for Structural Chemistry of Unstable and Stable Species,
Beijing National Laboratory for Molecular Sciences (BNLMS), Institute
of Chemistry, Chinese Academy of Sciences, Beijing 100190, Peoples Republic of China
| | - Mauricio F. Erben
- CEQUINOR
(UNLP − CONICET, CCT La Plata), Departamento de Química,
Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Boulevard 120 e/60 y 64 No. 1465, La Plata CP 1900, República Argentina
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4
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Kirschner KN, Heiden W, Reith D. Relative electronic and free energies of octane's unique conformations. Mol Phys 2016. [DOI: 10.1080/00268976.2016.1262076] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Karl N. Kirschner
- Department of Computer Science, Bonn-Rhein-Sieg University of Applied Sciences, Sankt Augustin, Germany
- Institute of Visual Computing, Bonn-Rhein-Sieg University of Applied Sciences, Sankt Augustin, Germany
| | - Wolfgang Heiden
- Department of Computer Science, Bonn-Rhein-Sieg University of Applied Sciences, Sankt Augustin, Germany
- Institute of Visual Computing, Bonn-Rhein-Sieg University of Applied Sciences, Sankt Augustin, Germany
| | - Dirk Reith
- Institute of Visual Computing, Bonn-Rhein-Sieg University of Applied Sciences, Sankt Augustin, Germany
- Department of Electrical Engineering, Mechanical Engineering and Technical Journalism, Bonn-Rhein-Sieg University of Applied Sciences, Sankt Augustin, Germany
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5
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Cozzarín MV, Tong S, Ge M, Della Védova CO, Romano RM. Preparation and Spectroscopic Studies of FC(O)SSCl. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600966] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Melina V. Cozzarín
- CEQUINOR (UNLP, CCT‐CONICET La Plata). Departamento de Química Facultad de Ciencias Exactas Universidad Nacional de La Plata Blvd. 120 No. 1465, CC 962 (CP 1900) La Plata República Argentina
| | - Shengrui Tong
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species Beijing National Laboratory for Molecular Sciences (BNLMS) Institute of Chemistry Chinese Academy of Sciences 100190 Beijing Peoples Republic of China
| | - Mao‐Fa Ge
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species Beijing National Laboratory for Molecular Sciences (BNLMS) Institute of Chemistry Chinese Academy of Sciences 100190 Beijing Peoples Republic of China
| | - Carlos O. Della Védova
- CEQUINOR (UNLP, CCT‐CONICET La Plata). Departamento de Química Facultad de Ciencias Exactas Universidad Nacional de La Plata Blvd. 120 No. 1465, CC 962 (CP 1900) La Plata República Argentina
| | - Rosana M. Romano
- CEQUINOR (UNLP, CCT‐CONICET La Plata). Departamento de Química Facultad de Ciencias Exactas Universidad Nacional de La Plata Blvd. 120 No. 1465, CC 962 (CP 1900) La Plata República Argentina
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6
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Thompson LM, Harb H, Hratchian HP. Natural ionization orbitals for interpreting electron detachment processes. J Chem Phys 2016; 144:204117. [DOI: 10.1063/1.4951738] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Affiliation(s)
- Lee M. Thompson
- Chemistry and Chemical Biology, University of California, Merced, California 95343, USA
| | - Hassan Harb
- Chemistry and Chemical Biology, University of California, Merced, California 95343, USA
| | - Hrant P. Hratchian
- Chemistry and Chemical Biology, University of California, Merced, California 95343, USA
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7
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Morini F, Watanabe N, Kojima M, Deleuze MS, Takahashi M. Electron momentum spectroscopy of dimethyl ether taking account of nuclear dynamics in the electronic ground state. J Chem Phys 2015; 143:134309. [PMID: 26450316 DOI: 10.1063/1.4931918] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The influence of nuclear dynamics in the electronic ground state on the (e,2e) momentum profiles of dimethyl ether has been analyzed using the harmonic analytical quantum mechanical and Born-Oppenheimer molecular dynamics approaches. In spite of fundamental methodological differences, results obtained with both approaches consistently demonstrate that molecular vibrations in the electronic ground state have a most appreciable influence on the momentum profiles associated to the 2b1, 6a1, 4b2, and 1a2 orbitals. Taking this influence into account considerably improves the agreement between theoretical and newly obtained experimental momentum profiles, with improved statistical accuracy. Both approaches point out in particular the most appreciable role which is played by a few specific molecular vibrations of A1, B1, and B2 symmetries, which correspond to C-H stretching and H-C-H bending modes. In line with the Herzberg-Teller principle, the influence of these molecular vibrations on the computed momentum profiles can be unraveled from considerations on the symmetry characteristics of orbitals and their energy spacing.
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Affiliation(s)
- Filippo Morini
- Center of Molecular and Materials Modelling, Hasselt University, Agoralaan Gebouw D, B-3590 Diepenbeek, Belgium
| | - Noboru Watanabe
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
| | - Masataka Kojima
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
| | - Michael Simon Deleuze
- Center of Molecular and Materials Modelling, Hasselt University, Agoralaan Gebouw D, B-3590 Diepenbeek, Belgium
| | - Masahiko Takahashi
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
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8
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Berrueta Martínez Y, Bava YB, Erben MF, Cavasso Filho RL, Romano RM, Della Védova CO. Photoexcitation, photoionization, and photofragmentantion of CF3CF2CF2C(O)Cl using synchrotron radiation between 13 and 720 eV. J Phys Chem A 2015; 119:1894-905. [PMID: 25679054 DOI: 10.1021/jp5122504] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The main inner shell ionization edges of gaseous CF3CF2CF2C(O)Cl, including Cl 2p, C 1s, O 1s, and F 1s, have been measured in Total Ion Yield (TIY) mode by using tunable synchrotron radiation, and several resonance transitions have been assigned with the help of quantum chemical calculations. Interestingly, resonance transitions observed in the C 1s region can be assigned to different carbon atoms in the molecule according to the degree of fluorine substitution. Ionic photofragmentation processes have been studied by time-of-flight mass spectrometry in the Photoelectron-Photoion-Coincidence (PEPICO) and Photoelectron-Photoion-Photoion-Coincidence (PEPIPICO) modes. These techniques revealed a "memory-lost" effect especially around the C 1s region, since the fragmentation events are independent of the energy range considered. Moreover, different fragmentation mechanisms were inferred from these spectra in the valence (13.0-21.0 eV) as well as in the inner (180.0-750.0 eV) electronic energy regions. The vibrational spectral features of CF3CF2CF2C(O)Cl have been interpreted in terms of a conformational equilibrium between two conformations (gauche and anti of the CC single bond with respect to the CCl one) at room temperature, as determined from quantum chemical calculations and the detailed analysis of the infrared spectrum.
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Affiliation(s)
- Yanina Berrueta Martínez
- CEQUINOR (UNLP-CONICET), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata , 47 esq. 115, 1900 La Plata, República Argentina
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9
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Morini F, Deleuze MS, Watanabe N, Takahashi M. Theoretical study of molecular vibrations in electron momentum spectroscopy experiments on furan: an analytical versus a molecular dynamical approach. J Chem Phys 2015; 142:094308. [PMID: 25747082 DOI: 10.1063/1.4913642] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The influence of thermally induced nuclear dynamics (molecular vibrations) in the initial electronic ground state on the valence orbital momentum profiles of furan has been theoretically investigated using two different approaches. The first of these approaches employs the principles of Born-Oppenheimer molecular dynamics, whereas the so-called harmonic analytical quantum mechanical approach resorts to an analytical decomposition of contributions arising from quantized harmonic vibrational eigenstates. In spite of their intrinsic differences, the two approaches enable consistent insights into the electron momentum distributions inferred from new measurements employing electron momentum spectroscopy and an electron impact energy of 1.2 keV. Both approaches point out in particular an appreciable influence of a few specific molecular vibrations of A1 symmetry on the 9a1 momentum profile, which can be unravelled from considerations on the symmetry characteristics of orbitals and their energy spacing.
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Affiliation(s)
- Filippo Morini
- Center of Molecular and Materials Modelling, Hasselt University, Agoralaan Gebouw D, B-3590 Diepenbeek, Belgium
| | - Michael S Deleuze
- Center of Molecular and Materials Modelling, Hasselt University, Agoralaan Gebouw D, B-3590 Diepenbeek, Belgium
| | - Noboru Watanabe
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
| | - Masahiko Takahashi
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
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10
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Pietrow M, Gagoś M, Misiak LE, Kornarzyński K, Szurkowski J, Rochowski P, Grzegorczyk M. Evidence for weakly bound electrons in non-irradiated alkane crystals: The electrons as a probe of structural differences in crystals. J Chem Phys 2015; 142:064502. [DOI: 10.1063/1.4907262] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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11
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Simmie JM, Somers KP. Benchmarking Compound Methods (CBS-QB3, CBS-APNO, G3, G4, W1BD) against the Active Thermochemical Tables: A Litmus Test for Cost-Effective Molecular Formation Enthalpies. J Phys Chem A 2015; 119:7235-46. [PMID: 25580800 DOI: 10.1021/jp511403a] [Citation(s) in RCA: 94] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The theoretical atomization energies of some 45 CxHyOz molecules present in the Active Thermochemical Tables compilation and of particular interest to the combustion chemistry community have been computed using five composite model chemistries as titled. The species contain between 1-8 "heavy" atoms, and a few are conformationally diverse with up to nine conformers. The enthalpies of formation at 0 and 298.15 K are then derived via the atomization method and compared against the recommended values. In general, there is very good agreement between our averaged computed values and those in the ATcT; those for 1,3-cyclopentadiene exceptionally differ considerably, and we show from isodesmic reactions that the true value for 1,3-cyclopentadiene is closer to 134 kJ mol(-1) than the reported 101 kJ mol(-1). If one is restricted to using a single method, statistical measures indicate that the best methods are in the rank order G3 ≈ G4 > W1BD > CBS-APNO > CBS-QB3. The CBS-x methods do on average predict ΔfH(⊖)(298.15 K) within ≈5 kJ mol(-1) but are prone to occasional lapses. There are statistical advantages to be gained from using a number of methods in tandem, and all possible combinations have been tested. We find that the average formation enthalpy coming from using CBS-APNO/G4, CBS-APNO/G3, and G3/G4 show lower mean signed and mean unsigned errors, and lower standard and root-mean-squared deviations, than any of these methods in isolation. Combining these methods also leads to the added benefit of providing an uncertainty rooted in the chemical species under investigation. In general, CBS-APNO and W1BD tend to underestimate the formation enthalpies of target species, whereas CBS-QB3, G3, and G4 have a tendency to overestimate the same. Thus, combining CBS-APNO with a G3/G4 combination leads to an improvement in all statistical measures of accuracy and precision, predicting the ATcT values to within 0.14 ± 4.21 kJ mol(-1), thus rivalling "chemical accuracy" (±4.184 kJ mol(-1)) without the excessive cost associated with higher-level methods such as W1BD.
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12
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Yang J, Shan X, Zhang Z, Tang Y, Zhao M, Chen X. Ring-puckering effects on electron momentum distributions of valence orbitals of oxetane. J Phys Chem A 2014; 118:11780-6. [PMID: 25423196 DOI: 10.1021/jp509526a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The binding energy spectra and electron momentum distributions for the outer-valence molecular orbitals of oxetane have been measured utilizing (e, 2e) electron momentum spectrometer with non-coplanar asymmetric geometry at the impact energy of 2500 eV. The experimental momentum distributions were compared with the density functional theory calculations employing B3LYP hybrid functional with aug-cc-pVTZ basis set. It was found that the calculation at planar geometry (C2v) completely fails to interpret the large "turn-up" at low momentum region in electron momentum distribution of the highest occupied molecular orbital (HOMO) 3b1, while the calculations considering the thermal abundances of planar (C2v) and bent (Cs) conformers or the thermally populated vibrational states of ring-puckering motion have significantly improved the agreement. The results indicate that the ring-puckering motion of oxetane has a strong effect on the electron density distribution of HOMO.
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Affiliation(s)
- Jing Yang
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China , 96 Jinzhai Road, Hefei, Anhui 230026, China
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13
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Rodríguez Pirani LS, Erben MF, Geronés M, Romano RM, Cavasso Filho RL, Ma C, Ge M, Della Védova CO. Electronic properties of FC(O)SCH2CH3. a combined helium(I) photoelectron spectroscopy and synchrotron radiation study. J Phys Chem A 2014; 118:5950-60. [PMID: 25019560 DOI: 10.1021/jp412564u] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The valence electronic properties of S-ethyl flouromethanethioate (S-ethyl fluoromethsanethioate), FC(O)SCH2CH3, were investigated by means of He(I) photoelectron spectroscopy in conjunction with the analysis of the photofragmentation products determined by PEPICO (phtoelectron-photoion-coincidence) by using synchrotron radiation in the 11.1-21.6 eV photon energy range. The first band observed at 10.28 eV in the HeI photoelectron spectrum can be assigned with confidence to the ionization process from the HOMO [nπ(S) orbital], which is described as a lone pair formally localized on the sulfur atom, in agreement with quantum chemical calculations using the outer valence Green function method [OVGF/6-311++G (d,p)]. One of the most important fragmentation channels also observed in the valence region corresponds to the decarbonylation process yielding the [M-CO](·+) ion, which is clearly observed at m/z = 80. Moreover, S 2p and S 2s absorption edges have been examined by measuring the total ion yield spectra in the 160-240 eV region using variable synchrotron radiation. The dynamic of ionic fragmentation following the Auger electronic decay has been evaluated with the help of the PEPIPICO (photoion-photoion-photoelectron-coincidence spectra) technique.
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Affiliation(s)
- Lucas S Rodríguez Pirani
- CEQUINOR (CONICET-UNLP), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata , C. C. 962 (1900) La Plata, República Argentina
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14
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Shojaei SHR, Vandenbussche J, Deleuze MS, Bultinck P. Electron momentum spectroscopy of 1-butene: a theoretical analysis using molecular dynamics and molecular quantum similarity. J Phys Chem A 2013; 117:8388-98. [PMID: 23902590 DOI: 10.1021/jp405122p] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The results of experimental studies of the valence electronic structure of 1-butene by means of electron momentum spectroscopy (EMS) have been reinterpreted on the basis of molecular dynamical simulations in conjunction with the classical MM3 force field. The computed atomic trajectories demonstrate the importance of thermally induced nuclear dynamics in the electronic neutral ground state, in the form of significant deviations from stationary points on the potential energy surface and considerable variations of the C-C-C-C dihedral angle. These motions are found to have a considerable influence on the computed spectral bands and outer-valence electron momentum distributions. Euclidean distances between spherically averaged electron momentum densities confirm that thermally induced nuclear motions need to be fully taken into account for a consistent interpretation of the results of EMS experiments on conformationally flexible molecules.
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Affiliation(s)
- S H Reza Shojaei
- Research Group of Theoretical Chemistry and Molecular Modelling, Hasselt University, Agoralaan, Gebouw D, B-3590 Diepenbeek, Belgium
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15
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Martin JML. What Can We Learn about Dispersion from the Conformer Surface of n-Pentane? J Phys Chem A 2013; 117:3118-32. [DOI: 10.1021/jp401429u] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Jan M. L. Martin
- Department
of Chemistry and Center for Advanced Scientific
Computing and Modeling (CASCaM), University of North Texas, Denton, Texas 76201, United States
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16
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Shojaei SHR, Morini F, Deleuze MS. Photoelectron and electron momentum spectroscopy of tetrahydrofuran from a molecular dynamical perspective. J Phys Chem A 2013; 117:1918-29. [PMID: 23387306 DOI: 10.1021/jp310722a] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The results of experimental studies of the valence electronic structure of tetrahydrofuran employing He I photoelectron spectroscopy as well as Electron Momentum Spectroscopy (EMS) have been reinterpreted on the basis of Molecular Dynamical simulations employing the classical MM3 force field and large-scale quantum mechanical simulations employing Born-Oppenheimer Molecular Dynamics in conjunction with the dispersion corrected ωB97XD exchange-correlation functional. Analysis of the produced atomic trajectories demonstrates the importance of thermal deviations from the lowest energy path for pseudorotation, in the form of considerable variations of the ring-puckering amplitude. These deviations are found to have a significant influence on several outer-valence electron momentum distributions, as well as on the He I photoelectron spectrum.
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Affiliation(s)
- S H Reza Shojaei
- Research Group of Theoretical Chemistry and Molecular Modelling, Hasselt University, Agoralaan Gebouw D, B-3590 Diepenbeek, Belgium
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17
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Holme A, Børve KJ, Sæthre LJ, Thomas TD. Conformations and CH/π interactions in aliphatic alkynes and alkenes. J Phys Chem A 2013; 117:2007-19. [PMID: 23441579 DOI: 10.1021/jp3121897] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
The carbon 1s photoelectron spectra of a series of aliphatic alkynes and alkenes that have the possibility of possessing two or more conformers have been recorded with high resolution. The two conformers of 2-hexyne and 4-methyl-1-pentyne, anti and gauche, have been identified and quantified from an analysis of their carbon 1s photoelectron spectra, yielding 30 ± 5% and 70 ± 6% anti conformers, respectively. In the case of 1-hexyne, the photoelectron spectrum is shown to provide partial information on the distribution of conformers. Central to these analyses is a pronounced ability of the C1s photoemission process to distinguish between conformers that display weak γ-CH/π hydrogen bonding and those that do not. For the corresponding alkene analogs, similar analyses of their C1s photoelectron spectra do not lead to conclusive information on the conformational equilibria, mainly because of significantly smaller chemical shifts and higher number of conformers compared with the alkynes.
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Affiliation(s)
- Alf Holme
- Department of Chemistry, University of Bergen, NO-5007 Bergen, Norway
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Watanabe N, Yamazaki M, Takahashi M. Vibrational effects on valence electron momentum distributions of ethylene. J Chem Phys 2012; 137:114301. [DOI: 10.1063/1.4752653] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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19
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Electron momentum spectroscopy of metal carbonyls: a reinvestigation of the role of nuclear dynamics. Theor Chem Acc 2012. [DOI: 10.1007/s00214-012-1244-5] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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20
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Miao YR, Deng JK, Ning CG. Vibrational effects on the electron momentum distributions of valence orbitals of formamide. J Chem Phys 2012; 136:124302. [PMID: 22462852 DOI: 10.1063/1.3696028] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The ionization energy spectra and electron momentum distributions of formamide were investigated using the high-resolution electron momentum spectrometer in combination with high level calculations. The observed ionization energy spectra and electron momentum distributions were interpreted using symmetry adapted cluster-configuration interaction theory, outer valence Green function, and DFT-B3LYP methods. The ordering of 10a(') and 2a(") orbitals of formamide was assigned unambiguously by comparing the experimental electron momentum distributions with the corresponding theoretical results, i.e., 10a(') has a lower binding energy. In addition, it was found that the low-frequency wagging vibration of the amino group at room temperature has noticeable effects on the electron momentum distributions. The equilibrium-nuclear-positions-approximation, which was widely used in electron momentum spectroscopy, is not accurate for formamide molecule. The calculations based on the thermal average can evidently improve the agreement with the experimental momentum distributions.
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Affiliation(s)
- Y R Miao
- Department of Physics, State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, People's Republic of China
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21
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Rodríguez Pirani LS, Geronés M, Della Védova CO, Romano RM, Fantoni A, Cavasso-Filho R, Ma C, Ge M, Erben MF. Electronic properties and dissociative photoionization of thiocyanates. Part II. Valence and shallow-core (sulfur and chlorine 2p) regions of chloromethyl thiocyanate, CH2ClSCN. J Phys Chem A 2011; 116:231-41. [PMID: 22098365 DOI: 10.1021/jp208232t] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
A combination of photoelectron spectroscopy and synchrotron based photoelectron photoion coincidence (PEPICO) spectra has been applied to investigate the electronic structure and the dissociative ionization of the CH(2)ClSCN molecule in the valence region. The PES is assigned with the electronic structure calculations at the outer-valence Green's function and symmetry adapted cluster/configuration interaction (SAC-CI) levels offer an explanation of our experimental results. Upon vacuum ultraviolet irradiation the low-lying radical cation, located at 10.39 eV is formed. The molecular ion is observed in the time-of-flight mass spectra, together with the CH(2)SCN(+) and CH(2)Cl(+) daughter ions. The total ion yield spectra have been measured in the S 2p and Cl 2p regions and several channels have been determined in dissociative photoionization events for the core-excited species. Thus, by using time-of-flight mass spectrometry and synchrotron radiation the relative abundances of the ionic fragments and their kinetic energy release values were obtained from both PEPICO and photoelectron photoion photoion coincidence spectra. Possible fragmentation processes are discussed and compared with that found for the related CH(3)SCN species.
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Affiliation(s)
- Lucas S Rodríguez Pirani
- CEQUINOR (UNLP-CONICET, CCT La Plata), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, CC 962, La Plata (CP 1900), República Argentina
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Knippenberg S, Eisenbrandt P, Šištík L, Slavíček P, Dreuw A. Simulation of Photoelectron Spectra Using the Reflection Principle in Combination with Unrestricted Excitation ADC(2) to Assess the Accuracy of Excited-State Calculations. Chemphyschem 2011; 12:3180-91. [DOI: 10.1002/cphc.201100485] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2011] [Indexed: 11/08/2022]
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23
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Pirani LSR, Erben MF, Geronés M, Ma C, Ge M, Romano RM, Filho RLC, Della Védova CO. Outermost and inner-shell electronic properties of ClC(O)SCH2CH3 studied using HeI photoelectron spectroscopy and synchrotron radiation. J Phys Chem A 2011; 115:5307-18. [PMID: 21553925 DOI: 10.1021/jp112182x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
A study of valence electronic properties of S-ethyl chlorothioformate (S-ethyl chloromethanethioate), ClC(O)SCH(2)CH(3), using HeI photoelectron spectra (PES) and synchrotron radiation is presented. Moreover, the photon impact excitation and dissociation dynamics of ClC(O)SCH(2)CH(3) excited at the S 2p and Cl 2p levels are elucidated by analyzing the total ion yield (TIY) spectra and time-of-flight mass spectra acquired in multicoincidence mode [photoelectron-photoion coincidence (PEPICO) and photoelectron-photoion-photoion coincidence (PEPIPICO)]. The HeI photoelectron spectrum is dominated by features associated with lone-pair electrons from the ClC(O)S- group, the HOMO at 9.84 eV being assigned to the n(π)(S) sulfur lone-pair orbital. Whereas the formation of C(2)H(5)(+) ion dominates the fragmentation in the valence energy region, the most abundant ion formed in both the S and Cl 2p energy ranges is C(2)H(3)(+). Comparison with related XC(O)SR (X = H, F, Cl and R = -CH(3), -C(2)H(5)) species reveals the impact of the alkyl chain on the photodissociation behavior of S-alkyl (halo)thioformates.
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Affiliation(s)
- Lucas S Rodríguez Pirani
- CEQUINOR (CONICET-UNLP), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, C. C. 962 (1900) La Plata, República Argentina
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Miao YR, Ning CG, Liu K, Deng JK. Dyson orbitals of N2O: Electron momentum spectroscopy and symmetry adapted cluster-configuration interaction calculations. J Chem Phys 2011; 134:204304. [DOI: 10.1063/1.3593271] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
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25
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Knippenberg S, Kunitski M, Dreuw A. Large Amplitude Motions in Cyclopentene and 1-Butene: Quantum Chemical Insights into the Ground- and Excited State Potential Energy Surfaces. Z PHYS CHEM 2011. [DOI: 10.1524/zpch.2011.0096] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract
The ring-puckering motion in cyclopentene as well as the hindered internal rotation around the central C–C bond in 1-butene have been studied by high-level quantum chemical calculations. Relevant potential energy surfaces of these molecules along these large-amplitude motions are provided as well as rotational constants are given allowing for thorough comparison with recent results from time-resolved femtosecond degenerate four-wave mixing (fs DFWM) spectroscopy. Emphasis is put on the performance of various post-Hartree Fock methods, the required level of electron correlation as well as the basis set quality.
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Affiliation(s)
- Stefan Knippenberg
- Goethe University Frankfurt, Institute of Physical and Theoretical Chemistry, Frankfurt a.M., Deutschland
| | - Maksim Kunitski
- Goethe University Frankfurt, Institute of Physical and Theoretical Chemistry, Frankfurt a.M., Deutschland
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26
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Morini F, Hajgató B, Deleuze MS. Electron Momentum Spectroscopy of Norbornadiene at the Benchmark ADC(3) Level. J Phys Chem A 2010; 114:9374-87. [DOI: 10.1021/jp105551j] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Filippo Morini
- Research Group of Theoretical Chemistry and Molecular Modelling, Hasselt University, Agoralaan Gebouw D, B-3590 Diepenbeek, Belgium
| | - Balázs Hajgató
- Research Group of Theoretical Chemistry and Molecular Modelling, Hasselt University, Agoralaan Gebouw D, B-3590 Diepenbeek, Belgium
| | - Michael S. Deleuze
- Research Group of Theoretical Chemistry and Molecular Modelling, Hasselt University, Agoralaan Gebouw D, B-3590 Diepenbeek, Belgium
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