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Sanders TJ, Allen JL, Plathe R, Horvat J, Lewis RA. The 3, 5, 6, and 7 THz resonances of α-glycine. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 253:119544. [PMID: 33631628 DOI: 10.1016/j.saa.2021.119544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 01/22/2021] [Accepted: 01/24/2021] [Indexed: 06/12/2023]
Abstract
Using an optically thin single crystal sample, mounted in a cryostat permitting cooling to 6 K, and a synchrotron as a bright light source, exceptionally well defined absorption spectra of well-characterised α-glycine have been obtained in the spectral range 2.5-7.5 THz (approximately 80-240 cm-1). Four separate resonances have been observed, respectively at 93, 152, 188, and 223 cm-1 at the lowest temperature. Each reduces in frequency (redshifts) as temperature increases. The origin of this observed behaviour is attributed to a phonon-mediated anharmonicity in the crystal potential.
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Affiliation(s)
- T J Sanders
- Institute for Superconducting and Electronic Materials and School of Physics, University of Wollongong, NSW 2522, Australia.
| | - J L Allen
- Institute for Superconducting and Electronic Materials and School of Physics, University of Wollongong, NSW 2522, Australia
| | - R Plathe
- Australian Synchrotron, Australian Nuclear Science and Technology Organisation, 800 Blackburn Rd Clayton, VIC 3168, Australia
| | - J Horvat
- Institute for Superconducting and Electronic Materials and School of Physics, University of Wollongong, NSW 2522, Australia
| | - R A Lewis
- Institute for Superconducting and Electronic Materials and School of Physics, University of Wollongong, NSW 2522, Australia
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Bajaj N, Bhatt H, Vishwakarma SR, Deo MN. Orientational Adaptations Leading to Plausible Phase Transitions in l-Leucine at Low Temperatures: Revealed by Infrared Spectroscopy. J Phys Chem B 2019; 123:561-570. [PMID: 30605334 DOI: 10.1021/acs.jpcb.8b09590] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Hydrogen bonding is essential for the stability of amino acids. A change in the geometry and conformation of hydrogen bonds in such molecular systems, for example, under varying thermodynamic conditions of temperature/pressure, may lead to subtle or drastic phase transitions. We demonstrate here the mechanism of temperature-induced phase transitions in the polycrystalline solid sample of l-leucine [(CH3)2-C(4)H-C(3)H2-C(2)H(C(1)OO-)(NH3+)], an "essential" amino acid, using in situ Fourier transform infrared spectroscopy in the temperature range 300-4.3 K. Unambiguous spectral signatures of preferred microstructural changes have been reported, which are linked to phase transitions at ∼150 and ∼240 K. The transition at 150 K is found to be associated with a sudden change in reorientation dynamics of the torsional vibrations of the (C3C4) group. In contrast, the transition at 240 K is associated with the conformational distortions in the NH3 group, which causes strengthening of the hydrogen bonds in the ac-plane forming two-dimensional sheets, well separated from each other in the b-direction. These findings pave the way toward settling the long-standing debate on the temperature-induced behavior of l-leucine as well as harnessing its physicochemical properties.
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Affiliation(s)
- Naini Bajaj
- High Pressure & Synchrotron Radiation Physics Division , Bhabha Atomic Research Centre , Mumbai 400085 , India.,Homi Bhabha National Institute , Anushakti Nagar , Mumbai 400094 , India
| | - Himal Bhatt
- High Pressure & Synchrotron Radiation Physics Division , Bhabha Atomic Research Centre , Mumbai 400085 , India
| | - S R Vishwakarma
- High Pressure & Synchrotron Radiation Physics Division , Bhabha Atomic Research Centre , Mumbai 400085 , India
| | - M N Deo
- High Pressure & Synchrotron Radiation Physics Division , Bhabha Atomic Research Centre , Mumbai 400085 , India.,Homi Bhabha National Institute , Anushakti Nagar , Mumbai 400094 , India
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El Khoury Y, Hellwig P. Far infrared spectroscopy of hydrogen bonding collective motions in complex molecular systems. Chem Commun (Camb) 2017; 53:8389-8399. [DOI: 10.1039/c7cc03496b] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Far infrared spectroscopy as a tool for the study of inter and intramolecular interactions in complex molecular structures.
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Affiliation(s)
- Youssef El Khoury
- Laboratoire de Bioélectrochimie et Spectroscopie
- UMR 7140
- CMC
- Université de Strasbourg CNRS
- Strasbourg
| | - Petra Hellwig
- Laboratoire de Bioélectrochimie et Spectroscopie
- UMR 7140
- CMC
- Université de Strasbourg CNRS
- Strasbourg
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Stehle CU, Abuillan W, Gompf B, Dressel M. Far-infrared spectroscopy on free-standing protein films under defined temperature and hydration control. J Chem Phys 2012; 136:075102. [DOI: 10.1063/1.3686886] [Citation(s) in RCA: 21] [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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Abstract
Low-frequency vibrational modes of biological molecules consist of intramolecular modes, which are dependent on the molecule as a whole, as well as intermolecular modes, which arise from hydrogen-bonding interactions and van der Waals forces. Vibrational modes thus contain important information about conformation dynamics of biological molecules, and can also be used for identification purposes. However, conventional Fourier transform infrared spectroscopy and terahertz time-domain spectroscopy (THz-TDS) often result in broad, overlapping features that are difficult to distinguish. The technique of waveguide THz-TDS has been recently developed, resulting in sharper features. For this technique, an ordered polycrystalline film of the molecule is formed on a metal sample plate. This plate is incorporated into a metal parallel-plate waveguide and probed via waveguide THz-TDS. The planar order of the film reduces the inhomogeneous broadening, and cooling of the samples to 77K reduces the homogenous broadening. This combination results in the line-narrowing of THz vibrational modes, in some cases to an unprecedented degree. Here, this technique has been demonstrated with seven small biological molecules, thymine, deoxycytidine, adenosine, D-glucose, tryptophan, glycine, and L-alanine. The successful demonstration of this technique shows the possibilities and promise for future studies of internal vibrational modes of large biological molecules.
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Melinger JS, Laman N, Harsha SS, Cheng S, Grischkowsky D. High-Resolution Waveguide Terahertz Spectroscopy of Partially Oriented Organic Polycrystalline Films. J Phys Chem A 2007; 111:10977-87. [DOI: 10.1021/jp074975i] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Joseph S. Melinger
- U.S. Naval Research Laboratory, Washington, District of Columbia 20375, School of Electrical and Computer Engineering, Oklahoma State University, Stillwater, Oklahoma 74078
| | - N. Laman
- U.S. Naval Research Laboratory, Washington, District of Columbia 20375, School of Electrical and Computer Engineering, Oklahoma State University, Stillwater, Oklahoma 74078
| | - S. Sree Harsha
- U.S. Naval Research Laboratory, Washington, District of Columbia 20375, School of Electrical and Computer Engineering, Oklahoma State University, Stillwater, Oklahoma 74078
| | - ShuFan Cheng
- U.S. Naval Research Laboratory, Washington, District of Columbia 20375, School of Electrical and Computer Engineering, Oklahoma State University, Stillwater, Oklahoma 74078
| | - D. Grischkowsky
- U.S. Naval Research Laboratory, Washington, District of Columbia 20375, School of Electrical and Computer Engineering, Oklahoma State University, Stillwater, Oklahoma 74078
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Siegrist K, Bucher CR, Mandelbaum I, Hight Walker AR, Balu R, Gregurick SK, Plusquellic DF. High-Resolution Terahertz Spectroscopy of Crystalline Trialanine: Extreme Sensitivity to β-Sheet Structure and Cocrystallized Water. J Am Chem Soc 2006; 128:5764-75. [PMID: 16637645 DOI: 10.1021/ja058176u] [Citation(s) in RCA: 86] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
High-resolution terahertz absorption spectra (0.06-3 THz) have been obtained at 4.2 K for three crystalline forms of trialanine [H2+-(Ala)3-O-]. The crystal structures differ in their beta-sheet forms (parallel vs antiparallel) and in their water composition (hydrated vs dehydrated antiparallel beta-sheet). The spectra are nearly vibrationally resolved, with little absorption below 1 THz. In sharp contrast to observations made in the mid-IR region, the spectral patterns of all three forms are qualitatively different, illustrating the extreme sensitivity to changes in the intermolecular hydrogen-bonding networks that stabilize peptide crystals. Predictions obtained from a classical force field model (CHARMM) and density functional theory (DFT/PW91) for periodic solids are compared with the X-ray structural data and the terahertz absorption spectra. In general, the results for the parallel beta-sheet are in better agreement with experiment than those for the antiparallel beta-sheet. For all three structures, however, most hydrogen bond distances are underestimated at both levels of theory, and the predicted absorption features are significantly red-shifted for the two antiparallel beta-sheet structures. Moreover, the nuclear motions predicted at the two levels of theory are qualitatively different. These results indicate that the PW91 functional is not sufficient to treat the weak intersheet hydrogen bonding present in the different beta-sheet forms and strongly suggest the need for improved force field models that include three-atom hydrogen-bonding terms for periodic solids.
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Affiliation(s)
- Karen Siegrist
- Optical Technology Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8443, USA
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Yamamoto K, Tominaga K, Sasakawa H, Tamura A, Murakami H, Ohtake H, Sarukura N. Far-Infrared Absorption Measurements of Polypeptides and Cytochromecby THz Radiation. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2002. [DOI: 10.1246/bcsj.75.1083] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Xie A, He Q, Miller L, Sclavi B, Chance MR. Low frequency vibrations of amino acid homopolymers observed by synchrotron far-ir absorption spectroscopy: Excited state effects dominate the temperature dependence of the spectra. Biopolymers 1999. [DOI: 10.1002/(sici)1097-0282(199906)49:7<591::aid-bip5>3.0.co;2-q] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Champion PM, Sievers AJ. Far infrared magnetic resonance of deoxyhemoglobin and deoxymyoglobin. J Chem Phys 1980. [DOI: 10.1063/1.439356] [Citation(s) in RCA: 35] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Champion PM, Sievers AJ. Far infrared magnetic resonance in FeSiF6⋅6H2O and Fe(SPh)42−. J Chem Phys 1977. [DOI: 10.1063/1.434200] [Citation(s) in RCA: 56] [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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