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Berg CM, Sun Y, Dlott DD. Temperature-Dependent Dynamic Response to Flash Heating of Molecular Monolayers on Metal Surfaces: Vibrational Energy Exchange. J Phys Chem B 2013; 118:7770-6. [DOI: 10.1021/jp410728j] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Christopher M. Berg
- School of Chemical Sciences, University of Illinois at Urbana−Champaign, Box 01-6 CLSL, 600 South Mathews Avenue, Urbana, Illinois 61801, United States
| | - Yuxiao Sun
- School of Chemical Sciences, University of Illinois at Urbana−Champaign, Box 01-6 CLSL, 600 South Mathews Avenue, Urbana, Illinois 61801, United States
| | - Dana D. Dlott
- School of Chemical Sciences, University of Illinois at Urbana−Champaign, Box 01-6 CLSL, 600 South Mathews Avenue, Urbana, Illinois 61801, United States
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Panman MR, Vos J, Bocokić V, Bellini R, de Bruin B, Reek JHN, Woutersen S. Exchanging conformations of a hydroformylation catalyst structurally characterized using two-dimensional vibrational spectroscopy. Inorg Chem 2013; 52:14294-8. [PMID: 24256078 DOI: 10.1021/ic402254q] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Catalytic transition-metal complexes often occur in several conformations that exchange rapidly (<ms) in solution so that their spatial structures are difficult to characterize with conventional methods. Here, we determine specific bond angles in the two rapidly exchanging solution conformations of the hydroformylation catalyst (xantphos)Rh(CO)2H using two-dimensional vibrational spectroscopy, a method that can be applied to any catalyst provided that the exchange between its conformers occurs on a time scale of a few picoseconds or slower. We find that, in one of the conformations, the OC-Rh-CO angle deviates significantly from the canonical value in a trigonal-bipyramidal structure. On the basis of complementary density functional calculations, we ascribe this effect to attractive van der Waals interaction between the CO and the xantphos ligand.
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Affiliation(s)
- Matthijs R Panman
- Van 't Hoff Institute for Molecular Sciences, University of Amsterdam , Science Park 904, 1098 XH Amsterdam, The Netherlands
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Panman MR, Newton AC, Vos J, van den Bosch B, Bocokić V, Reek JNH, Woutersen S. Ultrafast dynamics in iron tetracarbonyl olefin complexes investigated with two-dimensional vibrational spectroscopy. Phys Chem Chem Phys 2013; 15:1115-22. [DOI: 10.1039/c2cp43565a] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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McGrane SD, Barber J, Quenneville J. Anharmonic Vibrational Properties of Explosives from Temperature-Dependent Raman. J Phys Chem A 2005; 109:9919-27. [PMID: 16838908 DOI: 10.1021/jp0523219] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Raman spectra from 50 to 3500 cm(-1) and 4-296 K are analyzed for molecular crystal powders of the explosives pentaerythritol tetranitrate (PETN), beta-octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX), and 1,3,5-triamino-2,4,6-trinitrobenzene (TATB) and the inert naphthalene. Temperature-dependent Raman spectroscopy is utilized for its sensitivity to anharmonic couplings between thermally populated phonons and higher frequency vibrations relevant to shock up-pumping. The data are analyzed with anharmonic perturbation theory, which is shown to have significant fundamental limitations in application to real data. Fitting to perturbation theory revealed no significant differences in averaged anharmonicities among the three explosives, all of which exhibited larger averaged anharmonicities than naphthalene by a factor of 3. Calculations estimating the multiphonon densities of states also failed to correlate clearly with shock sensitivity. However, striking differences in temperature-dependent lifetimes were obvious: PETN has long lived phonons and vibrons, HMX has long lived phonons but short lived vibrons, while TATB has short lived phonons and vibrons at low temperature. Naphthalene, widely used as a model system, has significantly different anharmonicities and density of states from any of the explosives. The data presented suggest the further hypothesis that hindered vibrational energy transfer in the molecular crystals is a significant factor in shock sensitivity.
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Affiliation(s)
- Shawn D McGrane
- Dynamic Experimentation and Applied Physics Divisions, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
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Yoo HS, DeWitt MJ, Pate BH. Vibrational Dynamics of Terminal Acetylenes: I. Comparison of the Intramolecular Vibrational Energy Redistribution Rate of Gases and the Total Relaxation Rate of Dilute Solutions at Room Temperature. J Phys Chem A 2004. [DOI: 10.1021/jp027543a] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Hyun S. Yoo
- Department of Chemistry, University of Virginia, McCormick Road, Charlottesville, Virginia 22904
| | - Merrick J. DeWitt
- Department of Chemistry, University of Virginia, McCormick Road, Charlottesville, Virginia 22904
| | - Brooks H. Pate
- Department of Chemistry, University of Virginia, McCormick Road, Charlottesville, Virginia 22904
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Khalil M, Demirdöven N, Tokmakoff A. Vibrational coherence transfer characterized with Fourier-transform 2D IR spectroscopy. J Chem Phys 2004; 121:362-73. [PMID: 15260555 DOI: 10.1063/1.1756870] [Citation(s) in RCA: 166] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Two-dimensional infrared (2D IR) spectroscopy of the symmetric and asymmetric C[Triple Bond]O stretching vibrations of Rh(CO)(2)acac in hexane has been used to investigate vibrational coherence transfer, dephasing, and population relaxation in a multilevel vibrational system. The transfer of coherence between close-lying vibrational frequencies results in extra relaxation-induced peaks in the 2D IR spectrum, whose amplitude depends on the coherence transfer rate. Coherence transfer arises from the mutual interaction of the bright CO stretches with dark states, which in this case reflects the mutual d-pi(*) back bonding of the Rh center to both the terminal carbonyls and the acetylacenonate ligand. For 2D IR relaxation experiments with variable waiting times, coherent dynamics lead to the modulation of peak amplitudes, while incoherent population relaxation and exchange results in the growth of the relaxation-induced peaks. We have modeled the data by propagating the density matrix with the Redfield equation, incorporating all vibrational relaxation processes during all three experimental time periods and including excitation reorientation effects arising from relaxation. Coherence and population transfer time scales from the symmetric to the asymmetric stretch were found to be 350 fs and 3 ps, respectively. We also discuss a diagrammatic approach to incorporating all vibrational relaxation processes into the nonlinear response function, and show how coherence transfer influences the analysis of structural variables from 2D IR spectroscopy.
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Affiliation(s)
- M Khalil
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
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McGrane SD, Shreve AP. Temperature-dependent Raman spectra of triaminotrinitrobenzene: Anharmonic mode couplings in an energetic material. J Chem Phys 2003. [DOI: 10.1063/1.1601601] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Reilly PD, Skinner JL. Spectroscopy of a chromophore coupled to a lattice of dynamic two‐level systems. I. Absorption line shape. J Chem Phys 1994. [DOI: 10.1063/1.467750] [Citation(s) in RCA: 55] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Ewing GE. A model system for the study of structure and dynamics of molecules on surfaces: CO on NaCl(100). INT REV PHYS CHEM 1991. [DOI: 10.1080/01442359109353263] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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B. Myers A, Markel F. Vibrational dephasing and frequency shifts for highly excited vibrations of methyl iodide in solution. Chem Phys 1990. [DOI: 10.1016/0301-0104(90)80128-k] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Kroon R, Sprik R, Lagendijk A. Picosecond vibrational relaxation modulated by critical slowing down in ferroelectric K4Fe(CN)6. PHYSICAL REVIEW. B, CONDENSED MATTER 1990; 42:2785-2791. [PMID: 9995767 DOI: 10.1103/physrevb.42.2785] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Noda C, Richardson HH, Ewing GE. Infrared spectroscopy of CO on NaCl(100). II. Vibrational dephasing and band shapes. J Chem Phys 1990. [DOI: 10.1063/1.458042] [Citation(s) in RCA: 64] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
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Bradley M, Zerda TW, Jonas J. High pressure Raman study of vibrational relaxation of the Fermi coupled modes of ammonia. J Chem Phys 1985. [DOI: 10.1063/1.448840] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Watanesk R, Wilson RS. New approach to single-particle time-correlation function theory: Application to intramolecular dephasing in the condensed phase. Chem Phys 1984. [DOI: 10.1016/0301-0104(84)80028-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Cavagnat D, Lascombe J. Effect of the internal rotation of the CHD2group on the aliphatic CH stretching mode of the toluenes C6H5CHD2and C6D5CHD2in solid crystalline phases. J Chem Phys 1982. [DOI: 10.1063/1.443567] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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de Bree P, Wiersma DA. A resonance raman scattering study of vibrational dephasing in the mixed crystal of pentacene in naphthalene. Chem Phys Lett 1982. [DOI: 10.1016/0009-2614(82)80061-4] [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]
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Marks S, Cornelius PA, Harris CB. A critical test of vibrational dephasing theories in solids using spontaneous Raman scattering in isotopically mixed crystals. J Chem Phys 1980. [DOI: 10.1063/1.440565] [Citation(s) in RCA: 83] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Schindler W, Jonas J. Density and temperature effects on vibrational phase relaxation and frequency shifts in liquid isobutylene. J Chem Phys 1980. [DOI: 10.1063/1.439790] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Vibrational correlations in dense molecular systems. III. Exchange dephasing of high frequency bands for polyatomic molecules. Chem Phys 1980. [DOI: 10.1016/0301-0104(80)87010-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Abbott RJ, Oxtoby DW. Exchange dephasing and motional narrowing of vibrational modes. J Chem Phys 1979. [DOI: 10.1063/1.437257] [Citation(s) in RCA: 55] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Shelby RM, Harris CB, Cornelius PA. The origin of vibrational dephasing of polyatomic molecules in condensed phases. J Chem Phys 1979. [DOI: 10.1063/1.437197] [Citation(s) in RCA: 209] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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de Bree P, Wiersma DA. Application of Redfield theory to optical dephasing and line shape of electronic transitions in molecular mixed crystals. J Chem Phys 1979. [DOI: 10.1063/1.437512] [Citation(s) in RCA: 99] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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