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Dielectric constant of disordered phases of the smallest monoalcohols: Evidence for the hindered plastic crystal phase. Chem Phys 2022. [DOI: 10.1016/j.chemphys.2022.111554] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Mei A, Luo X. The structural, electronic and optical properties of γ-glycine under pressure: a first principles study. RSC Adv 2019; 9:3877-3883. [PMID: 35518109 PMCID: PMC9060534 DOI: 10.1039/c8ra08547a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2018] [Accepted: 01/10/2019] [Indexed: 11/21/2022] Open
Abstract
The crystallized amino acid γ-glycine is a large band gap insulator that shows promise in the fields of photonics and non-linear optics. To better understand its physical properties, the effect of pressure on the structural, electronic and optical properties of γ-glycine were investigated through a first principles calculation approach based on density functional theory. A band gap of 5.026 eV was found and was shown to decrease with an increase of pressure, due to the widening of the conduction and valence bands. The densities of states verify the observations made in the band structure and exhibit that the conduction bands are dominated by the O 2p and C 2p orbitals. The absorption spectra for γ-glycine was calculated using many-body Green's functions GW and reveals a slight blueshift in the absorption spectra. The information presented in this paper might be useful in better understanding the structural and optical properties of γ-glycine for future application.
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Affiliation(s)
- Aaron Mei
- National Graphene Research and Development Center Springfield Virginia 22151 USA
| | - Xuan Luo
- National Graphene Research and Development Center Springfield Virginia 22151 USA
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Danilov IV, Pronin AA, Gromnitskaya EL, Kondrin MV, Lyapin AG, Brazhkin VV. Structural and Dielectric Relaxations in Vitreous and Liquid State of Monohydroxy Alcohol at High Pressure. J Phys Chem B 2017; 121:8203-8210. [PMID: 28766946 DOI: 10.1021/acs.jpcb.7b05335] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
2-Ethyl-1-hexanol monoalcohol is a well-known molecular glassformer, which for a long time attracts attention of researchers. As in all other monohydroxy alcohols, its dielectric relaxation reveals two distinct relaxation processes attributed to the structural relaxation and another more intense process, which gives rise to a low-frequency Debye-like relaxation. In this monoalcohol, the frequency separation between these two processes reaches an extremely high value of 3 orders of magnitude, which makes this substance a rather convenient object for studies of mechanisms (supposedly common to all monoalcohols) leading to vitrification of this type of liquids. In this work, we apply two experimental techniques, dielectric spectroscopy and ultrasonic measurements (in both longitudinal and transverse polarizations) at high pressure, to study interference between different relaxation mechanisms occurring in this liquid, which could shed light on both structural and dielectric relaxation processes observed in a supercooled liquid and a glass state. Application of high pressure in this case leads to the simplification of the frequency spectrum of dielectric relaxation, where only one asymmetric feature is observed. Nonetheless, the maximum attenuation of the longitudinal wave in ultrasonic experiments at high pressure is observed at temperatures ≈50 K above the corresponding temperature for the transverse wave. This might indicate different mechanisms of structural relaxation in shear and bulk elasticities in this liquid.
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Affiliation(s)
- I V Danilov
- Institute for High Pressure Physics, Russian Academy of Sciences , Troitsk, Moscow 108840, Russia.,Moscow Institute of Physics and Technology , Dolgoprudny, Moscow Region 141701, Russia
| | - A A Pronin
- General Physics Institute, Russian Academy of Sciences , Moscow 117942, Russia
| | - E L Gromnitskaya
- Institute for High Pressure Physics, Russian Academy of Sciences , Troitsk, Moscow 108840, Russia
| | - M V Kondrin
- Institute for High Pressure Physics, Russian Academy of Sciences , Troitsk, Moscow 108840, Russia
| | - A G Lyapin
- Institute for High Pressure Physics, Russian Academy of Sciences , Troitsk, Moscow 108840, Russia.,Moscow Institute of Physics and Technology , Dolgoprudny, Moscow Region 141701, Russia
| | - V V Brazhkin
- Institute for High Pressure Physics, Russian Academy of Sciences , Troitsk, Moscow 108840, Russia
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Lin TJ, Hsing CR, Wei CM, Kuo JL. Structure prediction of the solid forms of methanol: an ab initio random structure searching approach. Phys Chem Chem Phys 2016; 18:2736-46. [DOI: 10.1039/c5cp06583f] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Liquid methanol and methanol clusters have been comprehensively studied to reveal their local structure and hydrogen bond networks.
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Affiliation(s)
- Tzu-Jen Lin
- Institute of Atomic and Molecular Sciences
- Academic Sinica
- Taipei
- Taiwan
| | - Cheng-Rong Hsing
- Institute of Atomic and Molecular Sciences
- Academic Sinica
- Taipei
- Taiwan
| | - Ching-Ming Wei
- Institute of Atomic and Molecular Sciences
- Academic Sinica
- Taipei
- Taiwan
| | - Jer-Lai Kuo
- Institute of Atomic and Molecular Sciences
- Academic Sinica
- Taipei
- Taiwan
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Kondrin MV, Pronin AA, Brazhkin VV. Crystallization and vitrification of ethanol at high pressures. J Chem Phys 2014; 141:194504. [PMID: 25416895 DOI: 10.1063/1.4902059] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We present the high pressure (up to 3 GPa) dielectric spectroscopy study of ethanol in supercooled liquid and solid states. It was found that ethanol can be obtained in the glassy form by relatively slow cooling in the pressure range below 1.5 GPa. Glassy dynamics of ethanol is dominated by hydrogen bonds which cause rise of fragility index with pressure rising and relatively slow increase of glassification temperature. The termination of ethanol galssification at 1.5 GPa is related to the phase transition of ethanol in this pressure range to the disordered crystal structure which allows easy crystallization of ethanol at high pressures. Dielectric spectroscopy of solid phases of ethanol reveals the presence of molecular motion in both of them in the temperature range close to the melting curve but demonstrates different molecular dynamics in the two solid phases of ethanol.
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Affiliation(s)
- M V Kondrin
- Institute for High Pressure Physics RAS, 142190 Troitsk, Moscow, Russia
| | - A A Pronin
- General Physics Institute RAS, 117942 Moscow, Russia
| | - V V Brazhkin
- Institute for High Pressure Physics RAS, 142190 Troitsk, Moscow, Russia
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Komatsu K, Kagi H, Yasuzuka T, Koizumi T, Iizuka R, Sugiyama K, Yokoyama Y. A design of backing seat and gasket assembly in diamond anvil cell for accurate single crystal x-ray diffraction to 5 GPa. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2011; 82:105107. [PMID: 22047329 DOI: 10.1063/1.3646460] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We designed a new cell assembly of diamond anvil cells for single crystal x-ray diffraction under pressure and demonstrate the application of the cell to the crystallographic studies for ice VI and ethanol high-pressure (HP) phase at 0.95(5) GPa and 1.95(2) GPa, respectively. The features of the assembly are: (1) the platy anvil and unique-shaped backing seat (called as "Wing seat") allowing the extremely wide opening angle up to ±65°, (2) the PFA-bulk metallic glass composite gasket allowing the easy attenuation correction and less background. Thanks to the designed assembly, the R(int) values after attenuation corrections are fairly good (0.0125 and 0.0460 for ice VI and ethanol HP phase, respectively), and the errors of the refined parameters are satisfactory small even for hydrogen positions, those are comparable to the results which obtained at ambient conditions. The result for ice VI is in excellent agreement with the previous study, and that for ethanol HP phase has remarkable contributions to the revision to its structure; the H12 site, which makes gauche molecules with O1, C2, and C3 sites, may not exist so that only trans conformers are present at least at 1.95(2) GPa. The accurate intensities using the cell assembly allow us to extract the electron density for ethanol HP phase by the maximum entropy method.
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Affiliation(s)
- K Komatsu
- Geochemical Research Center, Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan.
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Clegg JK, Hayter MJ, Jolliffe KA, Lindoy LF, McMurtrie JC, Meehan GV, Neville SM, Parsons S, Tasker PA, Turner P, White FJ. New discrete and polymeric supramolecular architectures derived from dinuclear Co(ii), Ni(ii) and Cu(ii) complexes of aryl-linked bis-β-diketonato ligands and nitrogen bases: synthetic, structural and high pressure studies. Dalton Trans 2010; 39:2804-15. [DOI: 10.1039/b920199h] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Prescimone A, Sanchez-Benitez J, Kamenev KK, Moggach SA, Warren JE, Lennie AR, Murrie M, Parsons S, Brechin EK. High pressure studies of hydroxo-bridged Cu(ii) dimers. Dalton Trans 2010:113-23. [DOI: 10.1039/b918287j] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Drebushchak TN, Kolesnik EN, Boldyreva EV. Variable temperature (100—295 K) single-crystal X-ray diffraction study of the α-polymorph of glycylglycine and a glycylglycine hydrate. ACTA ACUST UNITED AC 2009. [DOI: 10.1524/zkri.2006.221.2.128] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
SummaryThe crystal structures of theα-polymorph of glycylglycine (glygly) and of its hydrate (glygly × 1.5 H2O) were refined by single-crystal X-ray diffraction at 100, 150, 220, and 295 K (glygly) and at 100, 200, 295 K (glygly × 1.5 H2O). The values of the volume thermal expansions of glygly and its hydrate were shown to be larger than for the three polymorphs of glycine. The anisotropy of strain on cooling was analyzed. Despite a smaller bulk thermal expansion measured for glygly, linear strain (both compression and expansion) along the axes of the strain ellipsoids was larger for the structure of glygly, than for the structure of glygly × 1.5 H2O. The contributions of the distortion of the intermolecular hydrogen bonds and of the conformational changes of the zwitter-ions to the lattice strain are considered.
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Prescimone A, Milios CJ, Sanchez-Benitez J, Kamenev KV, Loose C, Kortus J, Moggach S, Murrie M, Warren JE, Lennie AR, Parsons S, Brechin EK. High pressure induced spin changes and magneto-structural correlations in hexametallic SMMs. Dalton Trans 2009:4858-67. [PMID: 19662276 DOI: 10.1039/b902485a] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first combined high pressure single-crystal X-ray diffraction and high pressure magnetism study of two polymetallic clusters is presented in an attempt to correlate the observed changes in structure with changes in magnetic response without the need for changes in external ligation. At 1.5 GPa the structure of [Mn(6)O(2)(Et-sao)(6)(O(2)CPh(Me)(2))(2)(EtOH)(6)] (1; Et-saoH(2) = 2-hydroxyphenylpropanone)--a single molecule magnet (SMM) with an effective anisotropy barrier of approximately 86 K--and of [Mn(6)O(2)(Et-sao)(6)(O(2)C-naphth)(2)(EtOH)(4)(H(2)O)(2)] 2 both undergo significant structural distortions of their metallic skeletons, which has a direct effect upon the observed magnetic response. The application of hydrostatic pressure on the two compounds (up to 1.5 GPa) flattens the Mn-N-O-Mn torsion angles weakening the magnetic exchange between the metal centres. In both compounds one interaction switches from ferro- to antiferromagnetic, with the Jahn-Teller (JT) axes compressing (on average) and re-aligning differently with respect to the plane of the three metal centres. High pressure dc chi(M)T plots display a gradual decrease in the low temperature peak height and slope, simulations showing a decrease in |J| with increasing pressure with a second antiferromagnetic J value required to simulate the data. The "ground states" change from S = 12 to S = 11 for 1 and to S = 10 for 2. Magnetisation data for both 1 and 2 suggest a small decrease in |D|, while out-of-phase (chi(M)(//)) ac data show a large decrease in the effective energy barrier for magnetisation reversal.
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Prescimone A, Sanchez-Benitez J, Kamenev KV, Moggach SA, Lennie AR, Warren JE, Murrie M, Parsons S, Brechin EK. High pressure effects on a trimetallic MnII/III SMM. Dalton Trans 2009:7390-5. [DOI: 10.1039/b908718d] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Lozano-Casal P, Allan DR, Parsons S. High-pressure structural study of L-α-glutamine and the use of Hirshfeld surfaces and graph-set notation to investigate the hydrogen bonding present in the structure up to 4.9 GPa. ACTA CRYSTALLOGRAPHICA SECTION B: STRUCTURAL SCIENCE 2008; 64:466-75. [DOI: 10.1107/s010876810801793x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2008] [Accepted: 06/12/2008] [Indexed: 11/11/2022]
Abstract
The crystal structure of L-α-glutamine has been elucidated at room temperature at pressures between 0 and 4.9 GPa by using single-crystal high-pressure X-ray diffraction techniques. The structure is primarily stabilized by five N—H...O intermolecular interactions, which link molecules in a herringbone-like layer arrangement, giving rise to voids within the solid. The application of pressure on the structure results in a reduction in the size of the voids, as a consequence of the shortening of the N—H...O hydrogen bonds, which compress to minimum N...O distances of around 2.6 Å, without driving the crystal structure to a phase transition. The decrease in the hydrogen-bond distances is due to the necessary stabilization of the structure, which arises from molecules modifying their positions to optimize electrostatic contacts and minimize the occupied space. Hirshfeld surfaces and fingerprint plots have been used to rapidly assess the structural changes that occur on application of pressure.
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Johnstone RDL, Francis D, Lennie AR, Marshall WG, Moggach SA, Parsons S, Pidcock E, Warren JE. High-pressure polymorphism in L-serine monohydrate: identification of driving forces in high pressure phase transitions and possible implications for pressure-induced protein denaturation. CrystEngComm 2008. [DOI: 10.1039/b810746g] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Boldyreva EV. High-pressure diffraction studies of molecular organic solids. A personal view. Acta Crystallogr A 2007; 64:218-31. [DOI: 10.1107/s0108767307065786] [Citation(s) in RCA: 146] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2007] [Accepted: 12/05/2007] [Indexed: 11/10/2022] Open
Abstract
This paper discusses the trends in the experimental studies of molecular organic solids at high pressures by diffraction techniques. Crystallization of liquids, crystallization from solutions and solid-state transformations are considered. Special attention is paid to the high-pressure studies of pharmaceuticals and of biomimetics.
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