1
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Nag P, Vennapusa SR. Multiple ESIPT pathways originating from three-state conical intersections in tropolone. J Chem Phys 2020; 153:084306. [PMID: 32872848 DOI: 10.1063/5.0020132] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Internal conversion decay dynamics associated with the potential energy surfaces of three low-lying singlet excited electronic states, S1 (ππ*, A'), S2 (ππ*, A'), and S3 (nπ*, A″), of tropolone are investigated theoretically. Energetic and spatial aspects of conical intersections of these electronic states are explored with the aid of the linear vibronic coupling approach. Symmetry selection rules suggest that non-totally symmetric modes would act as coupling modes between S1 and S3 as well as between S2 and S3. We found that the S1-S2 interstate coupling via totally symmetric modes is very weak. A diabatic vibronic Hamiltonian consisting of 32 vibrational degrees of freedom is constructed to simulate the photoinduced dynamics of S0 → S1 and S0 → S2 transitions. We observe a direct nonadiabatic population transfer from S1 to S3, bypassing S2, during the initial wavepacket propagation on S1. On the other hand, the initial wavepacket evolving on S2 would pass through the S2-S3 and S1-S3 conical intersections before reaching S1. The presence of multiple proton transfer channels on the S1-S2-S3 coupled potential energy surfaces of tropolone is analyzed. Our findings necessitate the treatment of proton tunneling dynamics of tropolone beyond the adiabatic symmetric double well potentials.
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Affiliation(s)
- Probal Nag
- Indian Institute of Science Education and Research Thiruvananthapuram, Maruthamala PO, Vithura, Thiruvananthapuram 695551, Kerala, India
| | - Sivaranjana Reddy Vennapusa
- Indian Institute of Science Education and Research Thiruvananthapuram, Maruthamala PO, Vithura, Thiruvananthapuram 695551, Kerala, India
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2
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Vealey ZN, Foguel L, Vaccaro PH. Hydrogen-Bonding Motifs and Proton-Transfer Dynamics in Electronically Excited 6-Hydroxy-2-formylfulvene. J Phys Chem A 2019; 123:6506-6526. [DOI: 10.1021/acs.jpca.9b05025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zachary N. Vealey
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520-8107, United States
| | - Lidor Foguel
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520-8107, United States
| | - Patrick H. Vaccaro
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520-8107, United States
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3
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Durlak P, Latajka Z. Investigations of the hydrogen bond in the crystals of tropolone and thiotropolone via car‐parrinello and path integral molecular dynamics. J Comput Chem 2018; 40:671-687. [DOI: 10.1002/jcc.25753] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Revised: 10/21/2018] [Accepted: 10/22/2018] [Indexed: 12/12/2022]
Affiliation(s)
- Piotr Durlak
- Faculty of ChemistryUniversity of Wrocław Wrocław 50‐383 Poland
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4
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Brela MZ, Wójcik MJ, Boczar M, Witek ŁJ, Yonehara T, Nakajima T, Ozaki Y. Proton dynamics in crystalline tropolone studied by Born-Oppenheimer molecular simulations. Chem Phys Lett 2018. [DOI: 10.1016/j.cplett.2018.07.026] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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5
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Nemchick DJ, Cohen MK, Vaccaro PH. Dual hydrogen-bonding motifs in complexes formed between tropolone and formic acid. J Chem Phys 2016; 145:204303. [DOI: 10.1063/1.4967253] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Affiliation(s)
- Deacon J. Nemchick
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520-8107, USA
| | - Michael K. Cohen
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520-8107, USA
| | - Patrick H. Vaccaro
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520-8107, USA
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6
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Theoretical Modeling of Vibrational Spectra and Proton Tunneling in Hydrogen-Bonded Systems. ADVANCES IN CHEMICAL PHYSICS 2016. [DOI: 10.1002/9781119165156.ch6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register]
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7
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Pejlovas AM, Serrato A, Lin W, Kukolich SG. Microwave measurements of the tropolone–formic acid doubly hydrogen bonded dimer. J Chem Phys 2016; 144:044306. [DOI: 10.1063/1.4940775] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Affiliation(s)
- Aaron M. Pejlovas
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721, USA
| | - Agapito Serrato
- Department of Chemistry, University of Texas Rio Grande Valley, Brownsville, Texas 78520, USA
| | - Wei Lin
- Department of Chemistry, University of Texas Rio Grande Valley, Brownsville, Texas 78520, USA
| | - Stephen G. Kukolich
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721, USA
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8
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Matsui H, Iwamoto K, Mochizuki D, Osada S, Asakura Y, Kuroda K. Proton tunneling in low dimensional cesium silicate LDS-1. J Chem Phys 2015; 143:024503. [DOI: 10.1063/1.4926445] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Affiliation(s)
- Hiroshi Matsui
- Department of Physics, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
| | - Kei Iwamoto
- Department of Physics, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
| | - Dai Mochizuki
- Interdisciplinary Cluster for Cutting Edge Research, Center for Energy and Environmental Science, Shinshu University, 3-15-1 Tokida, Ueda, Nagano 386-8567, Japan
| | - Shimon Osada
- Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University, Tokyo 169-8555, Japan
| | - Yusuke Asakura
- Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University, Tokyo 169-8555, Japan
| | - Kazuyuki Kuroda
- Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University, Tokyo 169-8555, Japan
- Kagami Memorial Research Institute for Material Science and Technology, Waseda University, Tokyo 169-0051, Japan
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9
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Mengesha ET, Sepioł J, Borowicz P, Waluk J. Vibrations of porphycene in the S0 and S1 electronic states: Single vibronic level dispersed fluorescence study in a supersonic jet. J Chem Phys 2013; 138:174201. [DOI: 10.1063/1.4802769] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
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10
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Chew K, Nemchick DJ, Vaccaro PH. Isotopic Dependence of Excited-State Proton-Tunneling Dynamics in Tropolone Probed by Polarization-Resolved Degenerate Four-Wave Mixing Spectroscopy. J Phys Chem A 2013; 117:6126-42. [DOI: 10.1021/jp400160z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kathryn Chew
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520-8107, United States
| | - Deacon J. Nemchick
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520-8107, United States
| | - Patrick H. Vaccaro
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520-8107, United States
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11
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Burns LA, Murdock D, Vaccaro PH. Double proton transfer in the and states of the tropolone • HF complex. Mol Phys 2010. [DOI: 10.1080/00268971003689907] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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12
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Murdock D, Burns LA, Vaccaro PH. Vibrational specificity of proton-transfer dynamics in ground-state tropolone. Phys Chem Chem Phys 2010; 12:8285-99. [DOI: 10.1039/c003140b] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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13
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Redington RL, Redington TE, Sams RL. Infrared Absorption Spectra in the Hydroxyl Stretching Regions of Gaseous Tropolone OHO Isotopomers. ACTA ACUST UNITED AC 2009. [DOI: 10.1524/zpch.2008.5383] [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
Fourier transform infrared (FTIR) absorption spectra in the 2000 to 3500 cm–1 range are reported for the gaseous 16
O,
16
O- and 18
O,
18
O-isotopomers of tropolone[OH(OD)] at 25 oC. The spectral doublet component separations are near 20 and 19 cm–1 for 16
O,
16
O- and 18
O,
18
O-Tp(OH), respectively, and near 7 and 6.5 cm–1 for 16
O,
16
O- and 18
O,
18
O-Tp(OD). The spectra suggest the tautomerization tunneling mechanisms in these states are complex multidimensional processes including the participation of IVR. In general, the OHO isotope effects demonstrate a mixing of O atom displacement coordinates into the intramolecular dynamics for most of the vibrational states observed in the fundamental CH/OH(OD) stretching regions.
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14
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Affiliation(s)
- Yi-Gui Wang
- Department of Chemistry, Yale University, New Haven, Connecticut 06520-8107
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15
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Murdock D, Burns LA, Vaccaro PH. Dissection of Rovibronic Structure by Polarization-Resolved Two-Color Resonant Four-Wave Mixing Spectroscopy. J Phys Chem A 2009; 113:13184-98. [DOI: 10.1021/jp903970d] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Daniel Murdock
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520-8107
| | - Lori A. Burns
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520-8107
| | - Patrick H. Vaccaro
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520-8107
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16
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Burns LA, Murdock D, Vaccaro PH. An exploration of electronic structure and nuclear dynamics in tropolone: II. The à B12 (π∗π) excited state. J Chem Phys 2009; 130:144304. [DOI: 10.1063/1.3089722] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
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17
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Redington RL, Redington TE, Sams RL. Tunneling Splittings for “O···O Stretching” and Other Vibrations of Tropolone Isotopomers Observed in the Infrared Spectrum Below 800 cm-1. J Phys Chem A 2008; 112:1480-92. [DOI: 10.1021/jp0757255] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Richard L. Redington
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409
| | - Theresa E. Redington
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409
| | - Robert L. Sams
- Wiley Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99352
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18
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Broadbent SA, Burns LA, Chatterjee C, Vaccaro PH. Investigation of electronic structure and proton transfer in ground state acetylacetone. Chem Phys Lett 2007. [DOI: 10.1016/j.cplett.2006.11.107] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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19
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20
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Redington RL, Redington TE, Sams RL. Quantum Tunneling in the Midrange Vibrational Fundamentals of Tropolone. J Phys Chem A 2006; 110:9633-42. [PMID: 16884197 DOI: 10.1021/jp062068s] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The Fourier transform infrared spectrum of tropolone(OH) vapor in the 1175-1700 cm(-1) region is reported at 0.0025 and 0.10 cm(-1) spectral resolutions. The 12 vibrational fundamentals in this region of rapidly rising vibrational state density are dominated by mixtures of the CC, CO, CCH, and COH internal coordinates. Estimates based on the measurement of sharp Q branch peaks are reported for 11 of the spectral doublet component separations DS(v) = |Delta(v) +/- Delta(0)|. Delta(0) = 0.974 cm(-1) is the known zero-point splitting, and three a(1) modes show tunneling splittings Delta(v) approximately Delta(0), four b(2) modes show splittings Delta(v) approximately 0.90Delta(0), and the remaining four modes show splittings Delta(v) falling 5-14% from Delta(0.) Significantly, the splitting for the nominal COH bending mode nu(8) (a(1)) is small, that is, 10% from Delta(0). Many of the vibrational excited states demonstrate strong anharmonic behavior, but there are only mild perturbations on the tautomerization mechanism driving Delta(0). The data suggest, especially for the higher frequency a(1) fundamentals, the onset of selective intramolecular vibrational energy redistribution processes that are fast on the time scale of the tautomerization process. These appear to delocalize and smooth out the topographical modifications of the zero-point potential energy surface that are anticipated to follow absorption of the nu(v) photon. Further, the spectra show the propensity for the Delta(v) splittings of b(2) and other complex vibrations to be damped relative to Delta(0).
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Affiliation(s)
- Richard L Redington
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX 79409, USA
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21
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Keske JC, Lin W, Pringle WC, Novick SE, Blake TA, Plusquellic DF. High-resolution studies of tropolone in the S0 and S1 electronic states: Isotope driven dynamics in the zero-point energy levels. J Chem Phys 2006; 124:74309. [PMID: 16497038 DOI: 10.1063/1.2165652] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Rotationally resolved microwave (MW) and ultraviolet (UV) spectra of jet-cooled tropolone have been obtained in S(0) and S(1) electronic states using Fourier-transform microwave and UV-laser/molecular-beam spectrometers. In the ground electronic state, the MW spectra of all heavy-atom isotopomers including one (18)O and four (13)C isotopomers were observed in natural abundance. The OD isotopomer was obtained from isotopically enriched samples. The two lowest tunneling states of each isotopomer except (18)O have been assigned. The observed inversion splitting for the OD isotopomer is 1523.227(5) MHz. For the asymmetric (13)C structures, the magnitudes of tunneling-rotation interactions are found to diminish with decreasing distance between the heavy atom and the tunneling proton. In the limit of closest approach, the 0(+) state of (18)O was well fitted to an asymmetric rotor Hamiltonian, reflecting significant changes in the tautomerization dynamics. Comparisons of the substituted atom coordinates with theoretical predictions at the MP2/aug-cc-pVTZ level of theory suggest the localized 0(+) and 0(-) wave functions of the heavier isotopes favor the C-OH and C=O forms of tropolone, respectively. The only exception occurs for the (13)C-OH and (13)C[Double Bond]O structures which correlate to the 0(-) and 0(+) states, respectively. These preferences reflect kinetic isotope effects as quantitatively verified by the calculated zero-point energy differences between members of the asymmetric atom pairs. From rotationally resolved data of the 0(+) <--0(+) and 0(-) <--0(-) bands in S(1), line-shape fits have yielded Lorentzian linewidths that differ by 12.2(16) MHz over the 19.88(4) cm(-1) interval in S(1). The fluorescence decay rates together with previously reported quantum yield data give nonradiative decay rates of 7.7(5) x 10(8) and 8.5(5) x 10(8) s(-1) for the 0(+) and 0(-) levels of the S(1) state of tropolone.
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Affiliation(s)
- John C Keske
- Optical Technology Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8441, USA
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22
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Redington RL. Isoelectronic Homologues and Isomers: Tropolone, 5-Azatropolone, 1-H-Azepine-4,5-dione, Saddle Points, and Ions. J Phys Chem A 2005; 110:1600-7. [PMID: 16435822 DOI: 10.1021/jp053928s] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Computational studies of 12 64-electron homologues and isomers of tropolone in the S(0) electronic ground state are reported. Three minimum-energy structures, tropolone (Tp), 5-azatropolone (5Azt), and 5-H-5-azatropolonium (5AztH(+)), have an internal H-bond and planar C(s)) geometry, and three, tropolonate (TpO(-)), 5-azatropolonate (5AzO(-)), and 1-H-azepine-4,5-dione (45Di), lack the H-bond and have twisted C(2) geometry. All 6 substances have an equal double-minimum potential energy surface and a saddle point with planar C(2)(v) geometry. The energy for the gas-phase isomerization reaction 45Di --> 5Azt is near +4 kJ mol(-1) at the MP4(SDQ)/6-311++G(df,pd)//MP2/6-311++G(df,pd) (energy//geometry) theoretical level and around -20 kJ mol(-1) at lower theoretical levels. The dipole moments computed for 45Di and 5Azt are 9.6 and 2.1 D, respectively, and this large difference contributes to MO-computed free energies of solvation that strongly favor--as experimentally observed--45Di over 5Azt in chloroform solvent. The MO-computed energy for the gas-phase protonation reaction 45Di + H(+) --> 5AztH(+) is -956.4 kJ mol(-1), leading to 926.8 kJ mol(-1) as the estimated proton affinity for 45Di at 298 K and 1 atm. The intramolecular dynamical properties predicted for 5Azt and 5AztH(+) parallel those observed for tropolone. They are therefore expected to exhibit spectral tunneling doublets. Once they are synthesized, they should contribute importantly to the understanding of multidimensional intramolecular H transfer and dynamical coupling processes.
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Affiliation(s)
- Richard L Redington
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409, USA
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23
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Redington RL, Redington TE, Blake TA, Sams RL, Johnson TJ. O18 effects on the infrared spectrum and skeletal tunneling of tropolone. J Chem Phys 2005; 122:224311. [PMID: 15974672 DOI: 10.1063/1.1897367] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Infrared-absorption profiles observed for vibrational transitions of gaseous tropolone often show sharp Q branch peaks, some of them ultranarrow spikes, indicative of the band origins for vibrational state-specific spectral tunneling doublets. In this work oxygen isotope effects for two CH wagging fundamentals, the COH torsion fundamental, and the skeletal contortion fundamental are reported. They allow considerations to be given: (1) oxygen isotope effects on the vibrational frequencies and state-specific tunneling splittings; (2) the asymmetry offset of the potential-energy minima for 16O and 18O tropolone; and (3) additional details concerning previously proposed high J rotation-contortion resonances in the contortional fundamental. The new results help to characterize the skeletal contortion fundamental and support the joint participation of skeletal tunneling with H tunneling in the vibrational state-specific tautomerization processes of tropolone in its ground electronic state.
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Affiliation(s)
- Richard L Redington
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409, USA.
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24
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Redington RL, Redington TE. Implications of comparative spectral doublets observed for neon-isolated and gaseous tropolone(OH) and tropolone(OD). J Chem Phys 2005; 122:124304. [PMID: 15836375 DOI: 10.1063/1.1860561] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Spectral doublet separations reported for gas phase and neon matrix-isolated samples of tropolone(OH) and tropolone(OD) are found to support recent work suggesting the possibility that tropolone has a slightly nonplanar geometry in the S1 (A 1B2) (pi*-pi) electronic state. Tautomerizations of gaseous tropolones in the S0 and S1 states are governed by equal double-minimum potential energy functions (PEFs), but interactions in the neon matrix environment transform the tautomerization PEFs of the slightly nonplanar S1 tropolones into unequal double-minimum PEFs. The spectral doublets reported for the zero-point S1-S0 transitions imply energy minima for the nonplanar S1 state in a neon matrix are offset by about 7 cm-1, and tunneling splittings in the symmetric double minimum PEFs of the gaseous molecules are damped about 2 cm-1 by the matrix environment. This means gas phase tunneling splittings smaller than 2 cm-1 are fully quenched in the neon matrix, and gas phase tunneling splittings near 20 cm-1 are damped by only 10%.
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Affiliation(s)
- Richard L Redington
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409, USA
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25
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Casadesús R, Vendrell O, Moreno M, Lluch JM. On the planarity of the tropolone molecule in the A˜1B2 excited state: A time dependent DFT geometry optimisation. Chem Phys Lett 2005. [DOI: 10.1016/j.cplett.2005.02.025] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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26
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Nosenko Y, Jasny J, Pietraszkiewicz M, Mordzinski A. Laser spectroscopy of porphycene derivatives: a search for proton tunneling in 2,7,12,17-tetra-tert-butylporphycene. Chem Phys Lett 2004. [DOI: 10.1016/j.cplett.2004.09.144] [Citation(s) in RCA: 8] [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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27
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Wu C, He Y, Kong W. Polarization spectroscopy of gaseous tropolone in a strong electric field. J Chem Phys 2004; 121:4577-84. [PMID: 15332888 DOI: 10.1063/1.1780166] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We report studies of polarization spectroscopy of gaseous tropolone in a strong electric field using resonantly enhanced multiphoton ionization. The electric field induces localization of the tunneling proton between the two equivalent oxygen atoms. As a result, the C2v symmetry of the molecular frame is broken, and the parity selection rule is violated. The field induced transitions are type A with transition dipoles perpendicular to those under field free conditions. The polarization ratios, i.e., the ratios of the overall excitation yield under different polarizations of the resonant laser, thus deviate from those of a pure type B transition. In a field of 60 kV/cm, the experimental polarization ratio implies an essentially equal mixture of type B and type A transitions. Moreover, the induced transitions overlap with the two field-free subbands, and the resulting intensity ratios between the two subbands demonstrate dependence on the applied electric field. These observations can be qualitatively modeled using a quantum mechanical approach by assuming a two level system. A puzzling result is the magnitude of the transition dipole of the induced transition, which is proven to be essentially linearly dependent on the applied electric field.
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Affiliation(s)
- Chengyin Wu
- Department of Chemistry, Oregon State University, Corvallis, Oregon 97331-4003, USA
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