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Singh K, Garg D, Bandyopadhyay A, Sengupta A. Dual spectroscopic detection of THz energy modes of critical chemical compounds. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2022; 271:120923. [PMID: 35121475 DOI: 10.1016/j.saa.2022.120923] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Revised: 01/14/2022] [Accepted: 01/17/2022] [Indexed: 06/14/2023]
Abstract
Precise identification and sensing of organic and inorganic molecular systems are key factors in several applications in present industrial and scientific domains. While high energy modes, due to electronic interactions, are mostly impervious to the initial thermodynamic or chemical conditions, the low energy modes are sensitive to such alterations which makes them suitable for quality control purpose with sensitive spectral identification methods. Here we report for the first time, several low frequency peaks of specific nitrogen-based compounds and their derivatives, using the dual spectroscopic approach of Terahertz Time-Domain Spectroscopy (THz-TDS) and THz Raman Spectroscopy (THz-RS). Two different isomeric molecular systems have also been investigated to assess both the selectivity and specificity of low energy modes in their identification and spectral correlation in terms of molecular interactions. This information of low frequency modes can be utilized readily by pharmaceutical and agri-food industries, chemical engineering and crystal growth communities in identification, detection, quality control and industrial waste management.
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Affiliation(s)
- Khushboo Singh
- Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India
| | - Diksha Garg
- Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India
| | - Aparajita Bandyopadhyay
- Joint Advanced Technology Center - Indian Institute of Technology Delhi, New Delhi 110016, India
| | - Amartya Sengupta
- Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India; School of IT and Electrical Engineering, University of Queensland, Brisbane, QLD 4072, Australia.
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2
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Kiely E, Zwane R, Fox R, Reilly AM, Guerin S. Density functional theory predictions of the mechanical properties of crystalline materials. CrystEngComm 2021. [DOI: 10.1039/d1ce00453k] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The DFT-predicted mechanical properties of crystalline materials are crucial knowledge for their screening, design, and exploitation.
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Affiliation(s)
- Evan Kiely
- Department of Physics, Bernal Institute, University of Limerick, V94 T9PX, Ireland
| | - Reabetswe Zwane
- School of Chemical Sciences, Dublin City University (DCU), Glasnevin, D09 C7F8 Dublin, Ireland
- SSPC, Science Foundation Ireland Research Centre for Pharmaceuticals, University of Limerick, V94 T9PX, Ireland
| | - Robert Fox
- School of Chemical Sciences, Dublin City University (DCU), Glasnevin, D09 C7F8 Dublin, Ireland
- SSPC, Science Foundation Ireland Research Centre for Pharmaceuticals, University of Limerick, V94 T9PX, Ireland
| | - Anthony M. Reilly
- School of Chemical Sciences, Dublin City University (DCU), Glasnevin, D09 C7F8 Dublin, Ireland
- SSPC, Science Foundation Ireland Research Centre for Pharmaceuticals, University of Limerick, V94 T9PX, Ireland
| | - Sarah Guerin
- Department of Physics, Bernal Institute, University of Limerick, V94 T9PX, Ireland
- SSPC, Science Foundation Ireland Research Centre for Pharmaceuticals, University of Limerick, V94 T9PX, Ireland
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Song M, Yang F, Su C, Deng B. Characterizing hydrogen bonds in crystalline form of guanidinium salicylate in the terahertz range. RSC Adv 2020; 11:307-319. [PMID: 35423026 PMCID: PMC8691105 DOI: 10.1039/d0ra08053e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Accepted: 12/14/2020] [Indexed: 11/21/2022] Open
Abstract
For pharmaceutical compounds with poor solubility, there is an effective method to address this dilemma without tampering their intrinsic chemical properties by forming weak hydrogen bonds. Guanidinium salicylate, which is a typical pharmaceutical salt with a complex crystal structure, was systematically investigated by terahertz time-domain spectroscopy combined with density functional theory in order to obtain the complete information of weak hydrogen bonds. As a result of the influence of weak hydrogen bonds, there are substantial differences between guanidinium salicylate and its parent molecule (salicylic acid) in the experimental fingerprint spectra in the range of 0.2-2.5 THz, such as the number, amplitude and frequency positions of absorption peaks. With the help of isolated molecule density functional theory calculations, the possible sites of weak hydrogen bonds were determined by natural bond orbital analysis. It can be concluded that there is an intricate hydrogen bond network due to the polar distribution of molecular electrostatic potential. Furthermore, all THz absorption peaks were assigned to their corresponding vibrational modes and the complete information of the related hydrogen bonds (including type, role, angle, and bond length) was determined by using dispersion-corrected density functional theory. The results laid a good foundation for further study on the enhancement of solubility of pharmaceutical salts by forming weak hydrogen bonds.
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Affiliation(s)
- Maojiang Song
- Guizhou Metrology Institute Guiyang Guizhou 550003 China
| | - Fei Yang
- Guizhou Metrology Institute Guiyang Guizhou 550003 China
| | - Caixia Su
- School of Big Data and Computer Science, Guizhou Nornal University Guizhou 550001 China
| | - Bing Deng
- Guizhou Metrology Institute Guiyang Guizhou 550003 China
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Schieber MN, Pipinos II, Johanning JM, Casale GP, Williams MA, DeSpiegelaere HK, Senderling B, Myers SA. Supervised walking exercise therapy improves gait biomechanics in patients with peripheral artery disease. J Vasc Surg 2019; 71:575-583. [PMID: 31443974 DOI: 10.1016/j.jvs.2019.05.044] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Accepted: 05/08/2019] [Indexed: 12/17/2022]
Abstract
OBJECTIVE In patients with peripheral artery disease (PAD), supervised exercise therapy is a first line of treatment because it increases maximum walking distances comparable with surgical revascularization therapy. Little is known regarding gait biomechanics after supervised exercise therapy. This study characterized the effects of supervised exercise therapy on gait biomechanics and walking distances in claudicating patients with PAD. METHODS Forty-seven claudicating patients with PAD underwent gait analysis before and immediately after 6 months of supervised exercise therapy. Exercise sessions consisted of a 5-minute warmup of mild walking and stretching of upper and lower leg muscles, 50 minutes of intermittent treadmill walking, and 5 minutes of cooldown (similar to warmup) three times per week. Measurements included self-perceived ambulatory limitations measured by questionnaire, the ankle-brachial index (ABI), walking distance measures, maximal plantar flexor strength measured by isometric dynamometry, and overground gait biomechanics trials performed before and after the onset of claudication pain. Paired t-tests were used to test for differences in quality of life, walking distances, ABI, and maximal strength. A two-factor repeated measures analysis of variance determined differences for intervention and condition for gait biomechanics dependent variables. RESULTS After supervised exercise therapy, quality of life, walking distances, and maximal plantar flexor strength improved, although the ABI did not significantly change. Several gait biomechanics parameters improved after the intervention, including torque and power generation at the ankle and hip. Similar to previous studies, the onset of claudication pain led to a worsening gait or a gait that was less like healthy individuals with a pain-free gait. CONCLUSIONS Six months of supervised exercise therapy produced increases in walking distances and quality of life that are consistent with concurrent improvements in muscle strength and gait biomechanics. These improvements occurred even though the ABI did not improve. Future work should examine the benefits of supervised exercise therapy used in combination with other available treatments for PAD.
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Affiliation(s)
- Molly N Schieber
- Department of Biomechanics, University of Nebraska at Omaha, Omaha, Neb
| | - Iraklis I Pipinos
- Department of Surgery, Veterans' Affairs Medical Center of Nebraska and Western Iowa, Omaha, Neb; Department of Surgery, University of Nebraska Medical Center, Omaha, Neb
| | - Jason M Johanning
- Department of Surgery, Veterans' Affairs Medical Center of Nebraska and Western Iowa, Omaha, Neb; Department of Surgery, University of Nebraska Medical Center, Omaha, Neb
| | - George P Casale
- Department of Surgery, University of Nebraska Medical Center, Omaha, Neb
| | - Mark A Williams
- Department of Medicine, Creighton Univeristy, School of Medicine, Omaha, Neb
| | - Holly K DeSpiegelaere
- Department of Surgery, Veterans' Affairs Medical Center of Nebraska and Western Iowa, Omaha, Neb
| | | | - Sara A Myers
- Department of Biomechanics, University of Nebraska at Omaha, Omaha, Neb; Department of Surgery, Veterans' Affairs Medical Center of Nebraska and Western Iowa, Omaha, Neb.
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Bennett JW, Raglione ME, Oburn SM, MacGillivray LR, Arnold MA, Mason SE. DFT Computed Dielectric Response and THz Spectra of Organic Co-Crystals and Their Constituent Components. Molecules 2019; 24:molecules24050959. [PMID: 30857228 PMCID: PMC6429106 DOI: 10.3390/molecules24050959] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2019] [Revised: 02/26/2019] [Accepted: 03/04/2019] [Indexed: 11/26/2022] Open
Abstract
Terahertz (THz) spectroscopy has been put forth as a non-contact, analytical probe to characterize the intermolecular interactions of biologically active molecules, specifically as a way to understand, better develop, and use active pharmaceutical ingredients. An obstacle towards fully utilizing this technique as a probe is the need to couple features in the THz regions to specific vibrational modes and interactions. One solution is to use density functional theory (DFT) methods to assign specific vibrational modes to signals in the THz region, coupling atomistic insights to spectral features. Here, we use open source planewave DFT packages that employ ultrasoft pseudopotentials to assess the infrared (IR) response of organic compounds and complex co-crystal formulations in the solid state, with and without dispersion corrections. We compare our DFT computed lattice parameters and vibrational modes to experiment and comment on how to improve the agreement between theory and modeling to allow for THz spectroscopy to be used as an analytical probe in complex biologically relevant systems.
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Affiliation(s)
- Joseph W Bennett
- Department of Chemistry, University of Iowa, Iowa City, IA 52242, USA.
| | | | - Shalisa M Oburn
- Department of Chemistry, University of Iowa, Iowa City, IA 52242, USA.
| | | | - Mark A Arnold
- Department of Chemistry, University of Iowa, Iowa City, IA 52242, USA.
| | - Sara E Mason
- Department of Chemistry, University of Iowa, Iowa City, IA 52242, USA.
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Takahashi M, Okamura N, Ding X, Shirakawa H, Minamide H. Intermolecular hydrogen bond stretching vibrations observed in terahertz spectra of crystalline vitamins. CrystEngComm 2018. [DOI: 10.1039/c8ce00095f] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Intermolecular hydrogen bond stretching vibrations in the crystal of vitamins has several specific properties in the THz spectrum.
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Affiliation(s)
- Masae Takahashi
- Graduate School of Agricultural Science
- Tohoku University
- Sendai 980-0845
- Japan
- RIKEN Advanced Science Institute
| | - Nobuyuki Okamura
- Graduate School of Agricultural Science
- Tohoku University
- Sendai 980-0845
- Japan
- RIKEN Advanced Science Institute
| | - Xiaomeng Ding
- Graduate School of Agricultural Science
- Tohoku University
- Sendai 980-0845
- Japan
| | - Hitoshi Shirakawa
- Graduate School of Agricultural Science
- Tohoku University
- Sendai 980-0845
- Japan
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7
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Takahashi M, Okamura N, Fan X, Shirakawa H, Minamide H. Temperature Dependence in the Terahertz Spectrum of Nicotinamide: Anharmonicity and Hydrogen-Bonded Network. J Phys Chem A 2017; 121:2558-2564. [DOI: 10.1021/acs.jpca.6b11049] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Masae Takahashi
- Graduate
School of Agricultural Science, Tohoku University, Sendai 980-0845, Japan
- RIKEN Advanced Science Institute, Sendai 980-0845, Japan
| | - Nubuyuki Okamura
- Graduate
School of Agricultural Science, Tohoku University, Sendai 980-0845, Japan
- RIKEN Advanced Science Institute, Sendai 980-0845, Japan
| | - Xinyi Fan
- Graduate
School of Agricultural Science, Tohoku University, Sendai 980-0845, Japan
| | - Hitoshi Shirakawa
- Graduate
School of Agricultural Science, Tohoku University, Sendai 980-0845, Japan
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Hoja J, Reilly AM, Tkatchenko A. First-principles modeling of molecular crystals: structures and stabilities, temperature and pressure. WILEY INTERDISCIPLINARY REVIEWS-COMPUTATIONAL MOLECULAR SCIENCE 2016. [DOI: 10.1002/wcms.1294] [Citation(s) in RCA: 91] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Johannes Hoja
- Fritz-Haber-Institut der Max-Planck-Gesellschaft; Berlin Germany
- Physics and Materials Science Research Unit; University of Luxembourg; Luxembourg City Luxembourg
| | | | - Alexandre Tkatchenko
- Fritz-Haber-Institut der Max-Planck-Gesellschaft; Berlin Germany
- Physics and Materials Science Research Unit; University of Luxembourg; Luxembourg City Luxembourg
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Abstract
Interest in molecular crystals has grown thanks to their relevance to pharmaceuticals, organic semiconductor materials, foods, and many other applications. Electronic structure methods have become an increasingly important tool for modeling molecular crystals and polymorphism. This article reviews electronic structure techniques used to model molecular crystals, including periodic density functional theory, periodic second-order Møller-Plesset perturbation theory, fragment-based electronic structure methods, and diffusion Monte Carlo. It also discusses the use of these models for predicting a variety of crystal properties that are relevant to the study of polymorphism, including lattice energies, structures, crystal structure prediction, polymorphism, phase diagrams, vibrational spectroscopies, and nuclear magnetic resonance spectroscopy. Finally, tools for analyzing crystal structures and intermolecular interactions are briefly discussed.
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Affiliation(s)
- Gregory J O Beran
- Department of Chemistry, University of California , Riverside, California 92521, United States
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Delaney SP, Korter TM. Terahertz Spectroscopy and Computational Investigation of the Flufenamic Acid/Nicotinamide Cocrystal. J Phys Chem A 2015; 119:3269-76. [DOI: 10.1021/jp5125519] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sean P. Delaney
- Department of Chemistry, Syracuse University, 1-014 Center
for Science and Technology, Syracuse, New York 13244-4100, United States
| | - Timothy M. Korter
- Department of Chemistry, Syracuse University, 1-014 Center
for Science and Technology, Syracuse, New York 13244-4100, United States
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Parrott EPJ, Zeitler JA. Terahertz time-domain and low-frequency Raman spectroscopy of organic materials. APPLIED SPECTROSCOPY 2015; 69:1-25. [PMID: 25506684 DOI: 10.1366/14-07707] [Citation(s) in RCA: 76] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
With the ongoing proliferation of terahertz time-domain instrumentation from semiconductor physics into applied spectroscopy over the past decade, measurements at terahertz frequencies (1 THz ≡ 10(12) Hz ≡ 33 cm(-1)) have attracted a sustained growing interest, in particular the investigation of hydrogen-bonding interactions in organic materials. More recently, the availability of Raman spectrometers that are readily able to measure in the equivalent spectral region very close to the elastic scattering background has also grown significantly. This development has led to renewed efforts in performing spectroscopy at the interface between dielectric relaxation phenomena and vibrational spectroscopy. In this review, we briefly outline the underlying technology, the physical phenomena governing the light-matter interaction at terahertz frequencies, recent examples of spectroscopic studies, and the current state of the art in assigning spectral features to vibrational modes based on computational techniques.
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Affiliation(s)
- Edward P J Parrott
- Chinese University of Hong Kong, Department of Electronic Engineering, Shatin, New Territories, Hong Kong Sar, China
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Juliano TR, Korter TM. London Force Correction Disparity in the Modeling of Crystalline Asparagine and Glutamine. J Phys Chem A 2014; 118:12221-8. [DOI: 10.1021/jp507924p] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Thomas R. Juliano
- Department of Chemistry, Syracuse University, 1-014 Center
for Science and Technology, Syracuse, New York 13244-4100, United States
| | - Timothy M. Korter
- Department of Chemistry, Syracuse University, 1-014 Center
for Science and Technology, Syracuse, New York 13244-4100, United States
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13
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Delaney SP, Smith TM, Korter TM. Conformational origins of polymorphism in two forms of flufenamic acid. J Mol Struct 2014. [DOI: 10.1016/j.molstruc.2014.02.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Delaney SP, Smith TM, Korter TM. Conformation versus cohesion in the relative stabilities of gabapentin polymorphs. RSC Adv 2014. [DOI: 10.1039/c3ra43887b] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Boronate Ligands in Materials: Determining Their Local Environment by Using a Combination of IR/Solid-State NMR Spectroscopies and DFT Calculations. Chemistry 2012; 19:880-91. [DOI: 10.1002/chem.201203560] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2012] [Indexed: 11/07/2022]
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Rönnholm P, Nilsson Lill SO, Gräfenstein J, Norrby PO, Pettersson M, Hilmersson G. Aggregation and Solvation of Chiral N,P-Amide Ligands in Coordinating Solvents: A Computational and NMR Spectroscopic Study. Chempluschem 2012. [DOI: 10.1002/cplu.201200033] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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