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Ma J, Zhang K, Du L, Wang X, Chen Z, Chen H, Chen C, Qiu P. Intrinsic Self-Healable, Corrosion-Resistant Silicone Coating Based on Quadruple Hydrogen-Bonded Supramolecular Polymer. ACS APPLIED MATERIALS & INTERFACES 2024; 16:34100-34112. [PMID: 38902890 DOI: 10.1021/acsami.4c05347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/22/2024]
Abstract
Corrosion-resistant coatings with self-healing capabilities are still a great challenge for metal protection. In this study, a corrosion-resistant coating with intrinsic self-healing capabilities was developed by compounding hydroxy-terminated silicone oil (HTSO) with 2-ureido-4[1H]-pyrimidone (UPy) derivatives. The smooth surface of the coating was shown by scanning electron microscopy (SEM), and good smoothness was also exhibited in the cross-section, which indicated that the coating is very homogeneous from the top to the bottom. Thermogravimetric analysis (TG) was employed to illustrate the temperature-resistant characteristics of the coating, revealing its significant chemical stability up to 360 °C. The corrosion resistance of the coating is assessed through electrochemical impedance spectroscopy (EIS), the typical impedance at 0.01 Hz is 1.70 × 109 and 2.44 × 108 Ω·cm2 before and after exposure to a 3.5 wt % NaCl solution for 70 days. There was no significant change in the water contact angle of the coatings before and after immersion; however, the adhesion strength was reduced. Notably, the coating demonstrates immediate and multiple self-healing properties. The tensile stress of the associated healing sample experiences an augmentation within the temperature range of 30-120 °C, with the critical fracture strain of the healed sample reaching 235% at 120 °C. The self-healing mechanism of the coating is systematically investigated using in situ Raman spectroscopy.
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Affiliation(s)
- Ji Ma
- College of New Energy and Materials, China University of Petroleum, Beijing 102200, China
| | - Kaili Zhang
- College of New Energy and Materials, China University of Petroleum, Beijing 102200, China
| | - Lili Du
- College of New Energy and Materials, China University of Petroleum, Beijing 102200, China
| | - Xujie Wang
- College of New Energy and Materials, China University of Petroleum, Beijing 102200, China
| | - Zhijie Chen
- College of New Energy and Materials, China University of Petroleum, Beijing 102200, China
| | - Hao Chen
- College of Safety and Ocean Engineering, China University of Petroleum, Beijing 102200, China
| | - Changfeng Chen
- Beijing Key Laboratory of Failure, Corrosion and Protection of Oil/Gas Facilities, China University of Petroleum, Beijing 102200, China
| | - Ping Qiu
- College of New Energy and Materials, China University of Petroleum, Beijing 102200, China
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2
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Crystal structure, IR and NMR spectra of (E)-2‑methoxy-4-(2-morpholinovinyl)phenol molecule and its DFT calculations. J Mol Struct 2023. [DOI: 10.1016/j.molstruc.2022.134669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
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3
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Pandimeena G, Mathavan T, Samuel EJJ, Milton Franklin Benial A. Quantum chemical, spectroscopic and molecular docking investigations of potential pulmonary fibrosis drug methyl 2-chloro 4-iodonicotinate. J Mol Recognit 2023; 36:e3001. [PMID: 36315423 DOI: 10.1002/jmr.3001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Revised: 10/14/2022] [Accepted: 10/26/2022] [Indexed: 11/06/2022]
Abstract
In this work, the methyl 2-chloro 4-iodonicotinate (MCIN) was investigated to study the structural, spectroscopic and electronic properties using density functional theory (DFT) quantum chemical calculations. The most stable structure of MCIN was optimized by DFT/B3LYP method with a LanLD2Z basis set. The optimized parameters and vibrational wavenumbers were determined. The vibrational task of the molecule was done by potential energy distribution calculations. The 13 C NMR spectrum of the MCIN molecule was simulated by the Gauge-Invariant-Atomic Orbital method using a dimethyl sulfoxide solution and the isotropic chemical shift values of the molecule were calculated and observed. Ultraviolet-visible spectra were simulated and observed. The pharmaceutical activity was predicted using frontier molecular orbital and natural bond orbital analysis. The reactive sites of the MCIN molecule were determined using Mulliken atomic charge distribution, molecular electrostatic potential surface and the local reactivity analysis. The molecular docking analysis confirms that the title molecule can be used in drug design for the treatment of pulmonary fibrosis.
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Affiliation(s)
- G Pandimeena
- P.G. & Research Department of Physics, N.M.S.S.V.N. College, Madurai, India
| | - T Mathavan
- P.G. & Research Department of Physics, N.M.S.S.V.N. College, Madurai, India
| | - E James Jebaseelan Samuel
- Department of Physics, School of Advanced Sciences, Vellore Institute of Technology (VIT) university, Vellore, India
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4
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Two Photon Absorption Properties of CBHB and DEABHB Single Crystals for Optical Limiting Applications. J Fluoresc 2022; 33:1077-1087. [PMID: 36571646 DOI: 10.1007/s10895-022-03070-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Accepted: 11/02/2022] [Indexed: 12/27/2022]
Abstract
Novel materials of (E)-N'-(4-chlorobenzylidene)-4-hydroxybenzohydrazide (CBHB) and (E)-N'-(4-(diethylamino) benzylidene)-4-hydroxybenzohydrazide (DEABHB) were synthesized by condensation reaction process and solvent evaporation method was employed to grow CBHB and DEABHB single crystals at room temperature. Lattice parameters of CBHB and DEABHB compounds were recorded using single crystal X-ray diffraction method. The presence of functional groups of the synthesized CBHB and DEABHB compounds were confirmed by Fourier transform infrared and Fourier transform Raman spectral analyses. Various intermolecular interactions were studied using Hirshfeld surface analysis. Thermal stability of the hydrazone Schiff base compounds CBHB and DEABHB were studied by thermogravimetric and differential thermal analyses. Third order nonlinear optical properties of CBHB and DEABHB were measured using open aperature Z scan technique. Two photon absorption coefficient and optical limiting properties of the crystals were reported from the Z scan studies.
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Nkoe P, Manicum ALE, Louis H, Malan FP, Nzondomyo WJ, Chukwuemeka K, Sithole SA, Imojara A, Chima CM, Agwamba EC, Unimuke TO. Influence of solvation on the spectral, molecular structure, and antileukemic activity of 1-benzyl-3-hydroxy-2-methylpyridin-4(1H)-one. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.121045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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6
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Third-order NLO studies of 2, 4-Bis (4-fluorophenyl)-2, 3-dihydro-1H-1, 5-benzodiazepine using Z-scan technique and DFT method. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.131169] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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7
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Sooryakala K, Ramalingam S, Periandy S, Aarthi R. NLO evaluation on opto-electronic application and chemical potential oscillation analysis of 2-Chloro-4-nitro-N-methylaniline crystal using crystallographic, spectroscopic and theoretical tools. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.129961] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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8
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Vinoth K, Saravanakannan V, Kumar PS, Sylvester MM, Karunakaran DA, Deshmukh AR, Ganesh T, Kumbharkhane A. Dielectric dispersion, relaxation processes and interaction investigation by time domain reflectometry, thermal analysis and spectral implications on aromatic amino acid in aqueous solution. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.115470] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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9
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Charanya C, Sampathkrishnan S, Balamurugan N. Quantum Chemical Computations, Molecular Docking, Experimental and DFT Calculation of 4-Amino-3-Phenylbutanoic Acid. Polycycl Aromat Compd 2020. [DOI: 10.1080/10406638.2020.1776347] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- C. Charanya
- Department of Physics, Sri Venkateshwara College of Engineering, Chennai, Tamilnadu, India
| | - S. Sampathkrishnan
- Department of Physics, Sri Venkateshwara College of Engineering, Chennai, Tamilnadu, India
| | - N. Balamurugan
- Department of Physics, Dhanalakshmi College of Engineering, Chennai, Tamilnadu, India
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10
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Abstract
Porous aromatic frameworks (PAFs) represent an important category of porous solids. PAFs possess rigid frameworks and exceptionally high surface areas, and, uniquely, they are constructed from carbon-carbon-bond-linked aromatic-based building units. Various functionalities can either originate from the intrinsic chemistry of their building units or are achieved by postmodification of the aromatic motifs using established reactions. Specially, the strong carbon-carbon bonding renders PAFs stable under harsh chemical treatments. Therefore, PAFs exhibit specificity in their chemistry and functionalities compared with conventional porous materials such as zeolites and metal organic frameworks. The unique features of PAFs render them being tolerant of severe environments and readily functionalized by harsh chemical treatments. The research field of PAFs has experienced rapid expansion over the past decade, and it is necessary to provide a comprehensive guide to the essential development of the field at this stage. Regarding research into PAFs, the synthesis, functionalization, and applications are the three most important topics. In this thematic review, the three topics are comprehensively explained and aptly exemplified to shed light on developments in the field. Current questions and a perspective outlook will be summarized.
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Affiliation(s)
- Yuyang Tian
- Key Laboratory of Polyoxometalate Science of the Ministry of Education and Faculty of Chemistry, Northeast Normal University, Changchun, 130024, P. R. China
| | - Guangshan Zhu
- Key Laboratory of Polyoxometalate Science of the Ministry of Education and Faculty of Chemistry, Northeast Normal University, Changchun, 130024, P. R. China
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Kuruvilla TK, Muthu S, Prasana JC, George J, Sara Saji R, Geoffrey B, Host Antony David R. Molecular docking, spectroscopic studies on 4-[2-(Dipropylamino) ethyl]-1,3-dihydro-2H-indol-2-one and QSAR study of a group of dopamine agonists by density functional method. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 222:117185. [PMID: 31177005 DOI: 10.1016/j.saa.2019.117185] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2019] [Revised: 05/02/2019] [Accepted: 05/26/2019] [Indexed: 06/09/2023]
Abstract
Density functional theory is one of the most popular accepted computational quantum mechanical techniques used in the analysis of molecular structure and vibrational spectra. Experimental and theoretical investigations of the molecular structure, electronic and vibrational characteristics of 4-[2-(Dipropylamino) ethyl]-1,3-dihydro-2H-indol-2-one are presented in this work. The title compound was characterized using FT-IR, FT-Raman and UV-Vis spectroscopic techniques. The results were compared with the theoretical calculations obtained using DFT/B3LYP with 6-311++G(d,p) as basis sets and was found to be in good agreement. The complete optimization of the molecular geometry of the title compound was carried out. Further, the vibrational assignments and calculation of potential energy distribution (PED) were reported. NLO has emerged as a key factor in recent researches. Materials showing nonlinear optical properties form the basis of nonlinear optics and development of such materials plays an important role in the present scenario. The current work provides sufficient justification for the title compound to be selected as a good non-linear optical (NLO) candidate. The electronic properties were reported using TD-DFT approach. The HOMO (EHOMO = -5.96 eV), LUMO (ELUMO = -0.80 eV) energies, energy gap and electrophilicity (2.22) was calculated in order to understand the stability, reactivity and bioactivity of the compound under investigation. To comprehend the bonding interactions we have performed the total (TDOS), partial (PDOS) and overlap population or COOP (Crystal Orbital Overlap Population) density of states. The drug likeness values were analyzed to evaluate the potential of the title compound to be an active pharmaceutical component. As a positive proof the paper further explains the molecular docking studies of the said compound. In addition, the stereochemistry of the protein structure was checked using Ramachandran plot. The title compound is a directly acting dopamine D2 agonist. In order to establish relationship between molecular descriptors of compound and its biological activity, QSAR studies have been done within the framework of DFT for 10 dopamine agonist including the title compound. Hence, the research exploration provides requisite information pertaining to the geometry, stability, reactivity and bioactivity of the compound through spectroscopic and quantum chemical methods.
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Affiliation(s)
- Tintu K Kuruvilla
- Department of Physics, Madras Christian College, East Tambaram 600059, Tamil Nadu, India
| | - S Muthu
- Department of Physics, Arignar Anna Govt. Arts College, Cheyyar 604407, Tamil Nadu, India.
| | | | - Jacob George
- Department of Physics, Madras Christian College, East Tambaram 600059, Tamil Nadu, India
| | - Rinnu Sara Saji
- Department of Physics, Madras Christian College, East Tambaram 600059, Tamil Nadu, India
| | - Ben Geoffrey
- Department of Physics, Madras Christian College, East Tambaram 600059, Tamil Nadu, India
| | - R Host Antony David
- Bioinformatics Infrastructure Facility for BITSnet, Madras Christian College, East Tambaram 600059, Tamil Nadu, India
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12
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Mabkhot YN, Al-Showiman SS, Barakat A, Soliman SM, Kheder NA, Alharbi MM, Asayari A, Muhsinah AB, Ullah A, Badshah SL. Computational studies of 2-(4-oxo-3-phenylthiazolidin-2-ylidene)malononitrile. BMC Chem 2019; 13:25. [PMID: 31384774 PMCID: PMC6661733 DOI: 10.1186/s13065-019-0542-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2017] [Accepted: 02/01/2019] [Indexed: 11/10/2022] Open
Abstract
The molecular structure of the 2-(4-oxo-3-phenylthiazolidin-2-ylidene) malononitrile (3) is calculated using DFT B3LYP/6-311G(d, p) method. The calculated geometric parameters are in good agreement with the experimental data. The NBO calculations were performed to predict the natural atomic charges at the different atomic sites and study the different intramolecular charge transfer (ICT) interactions occurring in the studied system. The BD(2)C17-C19 → BD*(2)C14-C15, LP(2)O2 → BD*(1)N5-C9 and LP(1)N5 → BD*(2)C10-C11 ICT interactions causing stabilization of the system by 23.30, 30.63 and 52.48 kcal/mol, respectively. The two intense electronic transition bands observed experimentally at 249 nm and 296 nm are predicted using the TD-DFT calculations at 237.9 nm (f = 0.1618) and 276.4 nm (f = 0.3408), respectively. These electronic transitions are due to H-3 → L (94%) and H → L (95%) excitations, respectively.
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Affiliation(s)
- Yahia N Mabkhot
- 1Department of Pharmaceutical Chemistry, College of Pharmacy, King Khalid University, Abha, 61441 Saudi Arabia
| | - Salim S Al-Showiman
- 2Department of Chemistry, College of Science, King Saud University, P. O. Box 2455, Riyadh, 11451 Saudi Arabia
| | - A Barakat
- 2Department of Chemistry, College of Science, King Saud University, P. O. Box 2455, Riyadh, 11451 Saudi Arabia.,3Department of Chemistry, Faculty of Science, Alexandria University, P.O Box 426, Ibrahimia Alexandria, 21321 Egypt
| | - S M Soliman
- 3Department of Chemistry, Faculty of Science, Alexandria University, P.O Box 426, Ibrahimia Alexandria, 21321 Egypt.,4Department of Chemistry, Rabigh College of Science and Art, King Abdulaziz University, Jeddah, 21589 Saudi Arabia
| | - Nabila A Kheder
- 5Department of Chemistry, Faculty of Science, Cairo University, Giza, 12613 Egypt
| | - Mohammed M Alharbi
- 2Department of Chemistry, College of Science, King Saud University, P. O. Box 2455, Riyadh, 11451 Saudi Arabia
| | - Abdulrahman Asayari
- 6Department of Pharmacognosy, College of Pharmacy, King Khalid University, Abha, 61441 Saudi Arabia
| | - Abdullatif Bin Muhsinah
- 6Department of Pharmacognosy, College of Pharmacy, King Khalid University, Abha, 61441 Saudi Arabia
| | - Asad Ullah
- 7Department of Chemistry, Islamia College University Peshawar, Peshawar, 25120 KPK Pakistan
| | - Syed Lal Badshah
- 7Department of Chemistry, Islamia College University Peshawar, Peshawar, 25120 KPK Pakistan
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13
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Xi HW, Mazian SZBM, Chan HYS, Hng HH, Goh HW, Lim KH. Theoretical studies on the structures, material properties, and IR spectra of polymorphs of 3,4-bis(1H-5-tetrazolyl)furoxan. J Mol Model 2019; 25:51. [PMID: 30707307 DOI: 10.1007/s00894-018-3896-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2018] [Accepted: 12/04/2018] [Indexed: 11/26/2022]
Abstract
Theoretical studies on the structures, densities, and heats of formation of conformational isomers of 3,4-bis(1H-5-tetrazolyl)furoxan (H2BTF) were performed based on density functional theory (DFT) calculations. Two stable planar conformational isomers, the face-to-back and the back-to-face conformers, and one stable slightly twisted conformer, the back-to-back conformer, were predicted for H2BTF at the M06-2X/6-311 + G(d,p) level of theory. The face-to-back conformer was calculated to be the most stable conformational isomer on the potential energy surface. No stable face-to-face conformer, whether planar or tilted, was identified in the calculations. The Vienna Ab Initio Simulation Package (VASP) was used in combination with molecular dynamics simulation to explore the stable crystal forms and the densities of the stable conformational isomers. Two of them exhibited high densities: the face-to-back conformer with P21 symmetry (2.01 g/cm3) and the back-to-back conformer with Pna21 symmetry (2.05 g/cm3). Their heats of formation were also predicted to be high when calculated at the same DFT level. The detonation pressures and velocities of these polymorphs, as calculated using the EXPLO5 program, are well above those of many advanced high energy density materials, pointing to the potential use of these conformers as novel explosives with good detonation performance. Also, IR spectra are shown to be able to distinguish these denser polymorphs of H2BTF. This study suggests that it could be worth investigating whether denser polymorphs of H2BTF can be grown.
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Affiliation(s)
- Hong-Wei Xi
- Singapore Institute of Technology, 10 Dover Drive, Singapore, 138683, Singapore
| | | | - Hay Yee Serene Chan
- Energetics Research Institute, Nanyang Technological University, 50 Nanyang Avenue, Singapore, Singapore
| | - Huey Hoon Hng
- Energetics Research Institute, Nanyang Technological University, 50 Nanyang Avenue, Singapore, Singapore
| | - Ho Wee Goh
- ATREC Pte Ltd, 601 Rifle Range Road, Singapore, 588398, Singapore.
| | - Kok Hwa Lim
- Singapore Institute of Technology, 10 Dover Drive, Singapore, 138683, Singapore.
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14
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Arjunan V, Anitha R, Mohan S. Experimental, quantum chemical, natural bond orbitals and reactivity investigations of 4–hydroxy–6–(trifluoromethyl)pyrimidine. ACTA ACUST UNITED AC 2018. [DOI: 10.1016/j.cdc.2018.08.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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15
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Synthesis, X-ray crystal structure, vibrational spectroscopy, DFT calculations, electronic properties and Hirshfeld analysis of (E) -4-Bromo- N '-(2,4-dihydroxy-benzylidene) benzohydrazide. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.03.023] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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16
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Sas E, Cankaya N, Kurt M. Synthesis of 2-(bis(cyanomethyl)amino)-2-oxoethyl methacrylate monomer molecule and its characterization by experimental and theoretical methods. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.01.088] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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17
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18
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Rajesh P, Gunasekaran S, Manikandan A, Gnanasambandan T. Structural, spectral analysis of ambroxol using DFT methods. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.04.116] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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19
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Charanya C, Sampathkrishnan S, Balamurugan N. Quantum mechanical analysis, spectroscopic (FT-IR, FT-Raman, UV-Visible) study, and HOMO-LUMO analysis of (1 S ,2 R )-2-amino-1-phenylpropan-1-ol using Density Functional Theory. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.01.096] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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20
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Bellich B, Di Fonzo S, Tavagnacco L, Paolantoni M, Masciovecchio C, Bertolotti F, Giannini G, De Zorzi R, Geremia S, Maiocchi A, Uggeri F, Masciocchi N, Cesàro A. Myelography Iodinated Contrast Media. 2. Conformational Versatility of Iopamidol in the Solid State. Mol Pharm 2017; 14:468-477. [PMID: 28059514 DOI: 10.1021/acs.molpharmaceut.6b00902] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The phenomenon of polymorphism is of great relevance in pharmaceutics, since different polymorphs have different physicochemical properties, e.g., solubility, hence, bioavailability. Coupling diffractometric and spectroscopic experiments with thermodynamic analysis and computational work opens to a methodological approach which provides information on both structure and dynamics in the solid as well as in solution. The present work reports on the conformational changes in crystalline iopamidol, which is characterized by atropisomerism, a phenomenon that influences both the solution properties and the distinct crystal phases. The conformation of iopamidol is discussed for three different crystal phases. In the anhydrous and monohydrate crystal forms, iopamidol molecules display a syn conformation of the long branches stemming out from the triiodobenzene ring, while in the pentahydrate phase the anti conformation is found. IR and Raman spectroscopic studies carried out on the three crystal forms, jointly with quantum chemical computations, revealed that the markedly different spectral features can be specifically attributed to the different molecular conformations. Our results on the conformational versatility of iopamidol in different crystalline phases, linking structural and spectroscopic evidence for the solution state and the solid forms, provide a definite protocol for grasping the signals that can be taken as conformational markers. This is the first step for understanding the crystallization mechanism occurring in supersaturated solution of iopamidol molecules.
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Affiliation(s)
- Barbara Bellich
- Laboratory of Physical and Macromolecular Chemistry, Department of Chemical and Pharmaceutical Sciences, University of Trieste , via Giorgieri 1, I-34127 Trieste, Italy
| | - Silvia Di Fonzo
- Elettra Sincrotrone Trieste , Area Science Park, I-34149 Trieste, Italy
| | - Letizia Tavagnacco
- Laboratory of Physical and Macromolecular Chemistry, Department of Chemical and Pharmaceutical Sciences, University of Trieste , via Giorgieri 1, I-34127 Trieste, Italy
| | - Marco Paolantoni
- Department of Chemistry, Biology and Biotechnologies, University of Perugia , via Elce di Sotto 8, I-06123 Perugia, Italy
| | | | - Federica Bertolotti
- Department of Science and High Technology, To.Sca.Lab and INSTM, University of Insubria , via Valleggio 11, I-22100 Como, Italy
| | - Giovanna Giannini
- Laboratory of Physical and Macromolecular Chemistry, Department of Chemical and Pharmaceutical Sciences, University of Trieste , via Giorgieri 1, I-34127 Trieste, Italy
| | - Rita De Zorzi
- Laboratory of Physical and Macromolecular Chemistry, Department of Chemical and Pharmaceutical Sciences, University of Trieste , via Giorgieri 1, I-34127 Trieste, Italy
| | - Silvano Geremia
- Laboratory of Physical and Macromolecular Chemistry, Department of Chemical and Pharmaceutical Sciences, University of Trieste , via Giorgieri 1, I-34127 Trieste, Italy
| | - Alessandro Maiocchi
- Centro Ricerche Bracco, Bracco Imaging SpA , via Ribes 5, I-10010 Colleretto Giacosa, Turin, Italy
| | - Fulvio Uggeri
- Centro Ricerche Bracco, Bracco Imaging SpA , via Ribes 5, I-10010 Colleretto Giacosa, Turin, Italy
| | - Norberto Masciocchi
- Department of Science and High Technology, To.Sca.Lab and INSTM, University of Insubria , via Valleggio 11, I-22100 Como, Italy
| | - Attilio Cesàro
- Laboratory of Physical and Macromolecular Chemistry, Department of Chemical and Pharmaceutical Sciences, University of Trieste , via Giorgieri 1, I-34127 Trieste, Italy.,Elettra Sincrotrone Trieste , Area Science Park, I-34149 Trieste, Italy
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Sas E, Kurt M, Can M, Horzum N, Atac A. Spectroscopic studies on 9H-carbazole-9-(4-phenyl) boronic acid pinacol ester by DFT method. J Mol Struct 2016. [DOI: 10.1016/j.molstruc.2016.03.064] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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22
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Evecen M, Duru G, Tanak H, Ağar AA. Synthesis, crystal structure, spectral analysis and DFT computational studies on a novel isoindoline derivative. J Mol Struct 2016. [DOI: 10.1016/j.molstruc.2016.03.079] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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23
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Rajesh P, Gunasekaran S, Gnanasambandan T, Seshadri S. Experimental and theoretical study of ornidazole. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2016; 153:496-504. [PMID: 26408856 DOI: 10.1016/j.saa.2015.08.032] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2014] [Revised: 08/08/2015] [Accepted: 08/14/2015] [Indexed: 06/05/2023]
Abstract
The Fourier transform infrared (FT-IR) and the Fourier transform Raman (FT-Raman) spectra of the title molecule in solid phase were recorded in the region 4000-400 cm(-1) and 4000-100 cm(-1) respectively. The geometrical parameters and energies were investigated with the help of Density Functional Theory (DFT) employing B3LYP method and 6-31G (d, p) basis set. The analysis was supported by electrostatic potential maps and calculation of HOMO-LUMO. UV, FT-IR and FT-Raman spectra of ornidazole were calculated and compared with experimental results. Thermodynamic properties like entropy, heat capacity, have been calculated for the molecule. The predicted first hyperpolarizability also shows that the molecule might have a reasonably good non-linear optical (NLO) behavior. The intramolecular contacts have been interpreted using natural bond orbital (NBO) and natural localized molecular orbital (NLMO) analysis.
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Affiliation(s)
- P Rajesh
- Department of Physics, Pachaiyappa's College, Chennai 600030, India; Department of Physics, Meenakshi Academy of Higher Education & Research, Faculty of Humanities and Science, Meenakshi University, Chennai-600078, India.
| | - S Gunasekaran
- Research & Development, St. Peter's University, Avadi, Chennai 600 054, India
| | - T Gnanasambandan
- Department of Physics, Pallavan College of Engineering, Kanchipuram 63150, India
| | - S Seshadri
- Department of Physics, L.N. Govt. Arts College, Ponneri 601204, India
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Al-Otaibi JS. Tautomerization, molecular structure, transition state structure, and vibrational spectra of 2-aminopyridines: a combined computational and experimental study. SPRINGERPLUS 2015; 4:586. [PMID: 26543721 PMCID: PMC4628003 DOI: 10.1186/s40064-015-1363-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Accepted: 09/21/2015] [Indexed: 12/03/2022]
Abstract
Background 2-amino pyridine derivatives have attracted considerable interest because they are useful precursors for the synthesis of a variety of heterocyclic compounds possessing a medicinal value. In this work we aim to study both structural and electronic as well as high quality vibrational spectra for 2-amino-3-methylpyridine (2A3MP) and 2-amino-4-methylpyridine (2A4MP). Results Møller–Plesset perturbation theory (MP2/6-31G(d) and MP2/6-31++G(d,p) methods were used to investigate the structure and vibrational analysis of (2A3MP) and (2A4MP). Tautomerization of 2A4MP was investigated by Density Functional Theory (DFT/B3LYP) method in the gas phase. For the first time, all tautomers including NH → NH conversions as well as those usually omitted, NH → CH and CH → CH, were considered. The canonical structure (2A4MP1) is the most stable tautomer. It is 13.60 kcal/mole more stable than the next (2A4MP2). Transition state structures of pyramidal N inversion and proton transfer were computed at B3LYP/6-311++G(d,p). Barrier to transition state of hydrogen proton transfer is calculated as 44.81 kcal/mol. Transition state activation energy of pyramidal inversion at amino N is found to be 0.41 kcal/mol using the above method. Bond order and natural atomic charges were also calculated at the same level. The raman and FT-IR spectra of (2A3MP) and (2A4MP) were measured (4000–400 cm−1). The optimized molecular geometries, frequencies and vibrational bands intensity were calculated at ab initio (MP2) and DFT(B3LYP) levels of theory with 6-31G(d), 6-31++G(d,p) and 6-311++G(d,p) basis sets. The vibrational frequencies were compared with experimentally measured FT-IR and FT-Raman spectra. Conclusion Reconsidering the vibrational analysis of (2A3MP) and (2A4MP) with more accurate FT-IR machine and highly accurate animation programs result in new improved vibrational assignments. Sophisticated quantum mechanics methods enable studying the transition state structure for different chemical systems. Electronic supplementary material The online version of this article (doi:10.1186/s40064-015-1363-2) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Jamelah S Al-Otaibi
- Department of Chemistry, College of Science, Princess Nourah bint Abdulrahman University, Riyadh, 11951 Saudi Arabia
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Anbarasan R, Dhandapani A, Manivarman S, Subashchandrabose S, Saleem H. Synthesis and spectroscopical study of rhodanine derivative using DFT approaches. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 146:261-272. [PMID: 25819314 DOI: 10.1016/j.saa.2015.02.097] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2014] [Revised: 01/28/2015] [Accepted: 02/19/2015] [Indexed: 06/04/2023]
Abstract
The optimized molecular structure, vibrational frequencies, corresponding vibrational assignments of (E)-5-benzylidene-2-thioxothiazolidine-4-one (E5BTTO) have been investigated experimentally and theoretically based on Density Functional Theory (DFT) approach. The FT-Raman and FT-IR spectra of E5BTTO were recorded in solid phase. Theoretical calculations were performed at the DFT level using the Gaussian 03 program. The experimental bands were assigned and characterized on the basis of the scaled theoretical wavenumber by their Total Energy Distribution (TED). The results of the calculation were applied to simulate infrared and raman spectra of the title compound which showed good agreement with the observed spectra. The calculated HOMO and LUMO energies show that charge transfer occur within the molecule. Stability arising from hyperconjugative interactions leading to its NLO activity and charge delocalization were analyzed using Natural Bond Orbital (NBO) analysis.
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Affiliation(s)
- R Anbarasan
- Post Graduate and Research Department of Chemistry, Government Arts College, C-Mutlur, Chidambaram 608102, Tamil Nadu, India
| | - A Dhandapani
- Post Graduate and Research Department of Chemistry, Government Arts College, C-Mutlur, Chidambaram 608102, Tamil Nadu, India
| | - S Manivarman
- Post Graduate and Research Department of Chemistry, Government Arts College, C-Mutlur, Chidambaram 608102, Tamil Nadu, India.
| | | | - H Saleem
- Department of Physics, Annamalai University, Annamalai Nagar, 608002, Tamil Nadu, India
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Karthikeyan N, Joseph Prince J, Ramalingam S, Periandy S. Spectroscopic [FT-IR and FT-Raman] and theoretical [UV-Visible and NMR] analysis on α-Methylstyrene by DFT calculations. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 143:107-119. [PMID: 25721781 DOI: 10.1016/j.saa.2015.02.015] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2014] [Revised: 01/07/2015] [Accepted: 02/04/2015] [Indexed: 06/04/2023]
Abstract
In the present research work, the FT-IR, FT-Raman and (13)C and (1)H NMR spectra of the α-Methylstyrene were recorded. The observed fundamental frequencies in finger print as well as functional group regions were assigned according to their uniqueness region. The Gaussian computational calculations are carried out by HF and DFT (B3LYP and B3PW91) methods with 6-31++G(d,p) and 6-311++G(d,p) basis sets and the corresponding results were tabulated. The impact of the presence of vinyl group in phenyl structure of the compound is investigated. The modified vibrational pattern of the molecule associated vinyl group was analyzed. Moreover, (13)C NMR and (1)H NMR were calculated by using the gauge independent atomic orbital (GIAO) method with B3LYP methods and the 6-311++G(d,p) basis set and their spectra were simulated and the chemical shifts linked to TMS were compared. A study on the electronic and optical properties; absorption wavelengths, excitation energy, dipole moment and frontier molecular orbital energies were carried out. The kubo gap of the present compound was calculated related to HOMO and LUMO energies which confirm the occurring of charge transformation between the base and ligand. Besides frontier molecular orbitals (FMO), molecular electrostatic potential (MEP) was performed. The NLO properties related to Polarizability and hyperpolarizability based on the finite-field approach were also discussed.
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Affiliation(s)
- N Karthikeyan
- Department of Physics, Indra Ganesan College of Engineering, Trichy, Tamil Nadu, India
| | - J Joseph Prince
- Department of Physics, Anna University, Bit Campus, Tiruchirappalli, Tamil Nadu, India
| | - S Ramalingam
- Department of Physics, A.V.C. College, Mayiladuthurai, Tamil Nadu, India.
| | - S Periandy
- Department of Physics, Tagore Arts College, Puducherry, India
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Anitha EG, Vedhagiri SJ, Parimala K. Conformational stability, vibrational spectra, NLO properties, NBO and thermodynamic analysis of 2-amino-5-bromo-6-methyl-4-pyrimidinol for dye sensitized solar cells by DFT methods. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 140:544-562. [PMID: 25645233 DOI: 10.1016/j.saa.2014.12.017] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2014] [Revised: 11/29/2014] [Accepted: 12/10/2014] [Indexed: 06/04/2023]
Abstract
The Fourier transform infrared (FT-IR) and Fourier transform Raman (FT-Raman) spectra of 2-amino-5-bromo-6-methyl-4-pyrimidinol (ABrMP) were recorded in the region 4000-400 and 3500-100 cm(-1), respectively. The conformational stability, geometrical structure, vibrational frequencies, infrared intensities and Raman activities were carried out by DFT (B3LYP and LSDA) methods with 6-311++G(d,p) basis set. The calculated results show good agreement with observed spectra. The charge delocalization have been analyzed using NBO analysis by LSDA/6-311++G(d,p) level of theory. The NLO properties (μ, α0, Δα, β0 and βvec) have been computed quantum mechanically. The calculated HOMO and LUMO energies show that, the charge transfer occurs within the molecule. The solvent effects have been calculated using TD-DFT and the results are in good agreement with experimental measurements. The other molecular properties like Mulliken population analysis, electrostatic potential (ESP) and thermodynamic properties of the title compound at the different temperatures have been calculated.
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Affiliation(s)
| | | | - K Parimala
- Department of Physics, Mookambigai College of Engineering, Kalamavur 622502, India.
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Jeyavijayan S. Molecular structure, vibrational spectra, NBO analysis, first hyperpolarizability, and HOMO–LUMO studies of 2-amino-4-hydroxypyrimidine by density functional method. J Mol Struct 2015. [DOI: 10.1016/j.molstruc.2014.12.047] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Sivakumar N, Srividya J, Mohana J, Anbalagan G. Growth, crystalline perfection, spectral and optical characterization of a novel optical material: l-tryptophan p-nitrophenol trisolvate single crystal. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 139:156-164. [PMID: 25556340 DOI: 10.1016/j.saa.2014.12.044] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2014] [Revised: 12/02/2014] [Accepted: 12/15/2014] [Indexed: 06/04/2023]
Abstract
l-tryptophan p-nitrophenol trisolvate (LTPN), an organic nonlinear optical material was synthesized using ethanol-water mixed solvent and the crystals were grown by a slow solvent evaporation method. The crystal structure and morphology were studied by single crystal X-ray diffraction analysis. The crystalline perfection of the LTPN crystal was analyzed by high-resolution X-ray diffraction study. The molecular structure of the crystal was confirmed by observing the various characteristic functional groups of the material using vibrational spectroscopy. The cut-off wavelength, optical transmission, refractive index and band gap energy were determined using UV-visible data. The variation of refractive index with wavelength shows the normal behavior. The second harmonic generation of the crystal was confirmed and the efficiency was measured using Kurtz Perry powder method. Single and multiple shot methods were employed to measure surface laser damage of the crystal. The photoluminescence spectral study revealed that the emission may be associated with the radiative recombination of trapped electrons and holes. Microhardness measurements revealed that LTPN belongs to a soft material category.
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Affiliation(s)
- N Sivakumar
- Department of Physics, Presidency College, Chennai 600 005, India
| | - J Srividya
- Department of Physics, Queen Marys College, Chennai 600 004, India
| | - J Mohana
- Department of Physics, Presidency College, Chennai 600 005, India
| | - G Anbalagan
- Department of Physics, Presidency College, Chennai 600 005, India.
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Srinivasaraghavan R, Thamaraikannan S, Seshadri S, Gnanasambandan T. Molecular conformational stability and Spectroscopic analysis of Parared with experimental techniques and quantum chemical calculations. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 137:1194-1205. [PMID: 25305611 DOI: 10.1016/j.saa.2014.07.046] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2014] [Revised: 07/02/2014] [Accepted: 07/18/2014] [Indexed: 06/04/2023]
Abstract
The complete vibrational assignment and analysis of the fundamental modes of Parared was carried out using the experimental FTIR and FT-Raman data and quantum chemical studies. The observed vibrational data were compared with the wavenumbers derived theoretically from the optimized geometry of the compound from the DFT-B3LYP gradient calculations employing 6-31G(d,p) and 6-311++G(d,p) basis sets. Thermodynamic properties like entropy, heat capacity and enthalpy have been calculated for the molecule. HOMO-LUMO energy gap has been calculated. The intramolecular contacts have been interpreted using natural bond orbital (NBO) and natural localized molecular orbital (NLMO) analysis. Important non-linear properties such as electric dipole moment and first hyperpolarizability of Parared have been computed using B3LYP quantum chemical calculations. Finally, the Mulliken population analysis on atomic charges of the title compound has been calculated.
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Affiliation(s)
- R Srinivasaraghavan
- Department of Physics, SCSVMV University, Enathur, Kanchipuram 631 561, India
| | - S Thamaraikannan
- Department of Physics, SCSVMV University, Enathur, Kanchipuram 631 561, India
| | - S Seshadri
- Department of Physics, L.N. Govt. College, Ponneri 601 204, India.
| | - T Gnanasambandan
- Department of Physics, Pallavan College of Engineering, Kanchipuram 631502, India
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31
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Boobalan MS, Amaladasan M, Ramalingam S, Tamilvendan D, Venkatesa Prabhu G, Bououdina M. First principles and DFT supported investigations on vibrational spectra and electronic structure of 2-((phenylamino)methyl)isoindoline-1,3-dione--an antioxidant active Mannich base. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 137:962-978. [PMID: 25282026 DOI: 10.1016/j.saa.2014.08.101] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2014] [Revised: 08/19/2014] [Accepted: 08/24/2014] [Indexed: 06/03/2023]
Abstract
The 2-((phenylamino)methyl)isoindoline-1,3-dione (PID) is a synthesized Mannich base which has significant antioxidant activity and biological importance. Quantum mechanical calculations on energy, geometry and vibrational wavenumber of PID were computed using ab initio HF and density functional theory (DFT/B3LYP) methods with 6-31+G/6-311++G(d,p) basis sets. Optimized geometrical parameters obtained by HF and DFT calculations were indicatively agreement with experimental crystal geometry. The experimental FT-Raman and FT-IR spectra of PID has been recorded and analyzed by comparing with simulated spectra. The (1)H and (13)C NMR spectra of title molecule records the chemical shift resulted from shielding and deshielding effects. Natural bond orbital (NBO) analysis has been carried out to calculate various intramolecular interactions that are accountable for the stabilization of this Mannich base. The predicted HOMO-LUMO gap offers interesting information on intramolecular charge transfer and reactivity of the molecular system. Molecular electrostatic potential (MEP) imprint visualize the reactive sites in PID, which is also supported by Mulliken, ESP, Hirshfeld and NBO charges. Thermodynamic properties of PID at various temperatures have been calculated at B3LYP/6-311++G(d,p) in gas phase and the correlations between standard entropies (S), internal energy (E or U) and standard heat capacity (C) with different temperatures.
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Affiliation(s)
- Maria susai Boobalan
- Department of Chemistry, St. Joseph's College, Tiruchirapalli 620 002, Tamil Nadu, India.
| | - M Amaladasan
- Department of Chemistry, St. Joseph's College, Tiruchirapalli 620 002, Tamil Nadu, India
| | - S Ramalingam
- Department of Physics, A.V.C. College, Mayiladuthurai 609 305, Tamil Nadu, India
| | - D Tamilvendan
- Department of Chemistry, National Institute of Technology, Tiruchirapalli 620 015, Tamil Nadu, India
| | - G Venkatesa Prabhu
- Department of Chemistry, National Institute of Technology, Tiruchirapalli 620 015, Tamil Nadu, India
| | - M Bououdina
- Nanotechnology Centre, University of Bahrain, Bahrain
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Gladis Anitha E, Joseph Vedhagiri S, Parimala K. Spectroscopic (FT-IR, FT-Raman and UV-Visible) investigations, NMR chemical shielding anisotropy (CSA) parameters of 2,6-Diamino-4-chloropyrimidine for dye sensitized solar cells using density functional theory. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 136 Pt C:1557-1568. [PMID: 25459717 DOI: 10.1016/j.saa.2014.10.049] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2014] [Revised: 09/28/2014] [Accepted: 10/15/2014] [Indexed: 06/04/2023]
Abstract
The molecular structure, geometry optimization, vibrational frequencies of organic dye sensitizer 2,6-Diamino-4-chloropyrimidine (DACP) were studied based on Hartree-Fock (HF) and density functional theory (DFT) using B3LYP methods with 6-311++G(d,p) basis set. Ultraviolet-Visible (UV-Vis) spectrum was investigated by time dependent DFT (TD-DFT). Features of the electronic absorption spectrum in the UV-Visible regions were assigned based on TD-DFT calculation. The absorption bands are assigned to transitions. The interfacial electron transfer between semiconductor TiO2 electrode and dye sensitizer DACP is due to an electron injection process from excited dye to the semiconductor's conduction band. The observed and the calculated frequencies are found to be in good agreement. The energies of the frontier molecular orbitals (FMOS) have also been determined. The chemical shielding anisotropic (CSA) parameters are calculated from the NMR analysis, Stability of the molecule arising from hyperconjugative interactions and charge delocalization has been analyzed using natural bond orbital (NBO) analysis.
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Affiliation(s)
| | | | - K Parimala
- Department of Physics, Mookambigai College of Engineering, Kalamavur 622502, India.
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Jeyavijayan S. Spectroscopic (FTIR, FT-Raman), molecular electrostatic potential, NBO and HOMO-LUMO analysis of P-bromobenzene sulfonyl chloride based on DFT calculations. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 136 Pt B:890-899. [PMID: 25459613 DOI: 10.1016/j.saa.2014.09.110] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2014] [Revised: 09/20/2014] [Accepted: 09/25/2014] [Indexed: 06/04/2023]
Abstract
The FTIR and FT-Raman spectra of P-bromobenzene sulfonyl chloride (P-BBSC) have been recorded in the regions 4000-400 cm(-1) and 3500-50 cm(-1), respectively. Utilizing the observed FTIR and FT-Raman data, a complete vibrational assignment and analysis of the fundamental modes of the compound were carried out. The optimum molecular geometry, harmonic vibrational frequencies, infrared intensities and Raman scattering activities, were calculated by density functional theory (DFT/B3LYP) method. A good agreement between experimental and calculated normal modes of vibrations has been observed. A detailed interpretation of the infrared and Raman spectra of P-BBSC is also reported based on total energy distribution (TED). Stability of the molecule arising from hyperconjugative interactions, charge delocalization have been analyzed using natural bond orbital (NBO) analysis. The MEP map shows the negative potential sites are on oxygen atoms as well as the positive potential sites are around the hydrogen atoms. The UV-vis spectral analysis of P-BBSC has also been done which confirms the charge transfer of the molecule.
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Affiliation(s)
- S Jeyavijayan
- Department of Physics, J.J. College of Engineering and Technology, Tiruchirappalli 620 009, India.
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Boobalan MS, Tamilvendan D, Amaladasan M, Ramalingam S, Venkatesa Prabhu G, Bououdina M. Vibrational spectra and electronic structure of 3-((1H-pyrrol-1-yl) methyl) naphthalen-2-ol – A computational insight on antioxidant active Mannich base. J Mol Struct 2015. [DOI: 10.1016/j.molstruc.2014.10.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Balachandran V, Karpagam V, Revathi B, Kavimani M, Santhi G. Conformational stability, vibrational and NMR analysis, chemical potential and thermodynamical parameter of 3-tert-butyl-4-hydroxyanisole. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 135:1039-1051. [PMID: 25173520 DOI: 10.1016/j.saa.2014.07.093] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2014] [Revised: 07/12/2014] [Accepted: 07/29/2014] [Indexed: 06/03/2023]
Abstract
The FT-IR and FT-Raman spectra of 3-tert-butyl-4-hydroxyanisole (TBHA) molecule have been recorded in the region 4000-400 cm(-1) and 3500-100 cm(-1), respectively. Optimized geometrical structure, harmonic vibrational frequencies has been computed by B3LYP level using 6-31G (d,p) and 6-311+G (d,p) basis sets. The observed FT-IR and FT-Raman vibrational frequencies are analyzed and compared with theoretically predicted vibrational frequencies. The geometries and normal modes of vibration obtained from DFT method are in good agreement with the experimental data. The Mulliken charges, the natural bonding orbital (NBO) analysis, the first-order hyperpolarizability of the investigated molecule were computed using DFT calculations. Besides, charge transfer occurring in the molecule between HOMO and LUMO energies, frontier energy gap, molecular electrostatic potential (MEP) were calculated and analyzed. The isotropic chemical shift computed by (1)H and (13)C nuclear magnetic resonance (NMR) chemical shifts of the TBHA calculated using the gauge invariant atomic orbital (GIAO) method also shows good agreement with experimental observations.
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Affiliation(s)
- V Balachandran
- Research Department of Physics, AA Government Arts College, Musiri 621211, India.
| | - V Karpagam
- Department of Physics, Sri Saradha College for Women, Perambalur 621212, India
| | - B Revathi
- Research Department of Physics, AA Government Arts College, Musiri 621211, India
| | - M Kavimani
- Research Department of Physics, AA Government Arts College, Musiri 621211, India
| | - G Santhi
- PG Department of Physics, Government Arts College, Karur 639005, India
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Saş EB, Kurt M, Can M, Okur S, İçli S, Demiç S. Structural investigation of a self-assembled monolayer material 5-[(3-methylphenyl) (phenyl) amino] isophthalic acid for organic light-emitting devices. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 133:307-317. [PMID: 24954755 DOI: 10.1016/j.saa.2014.05.021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2014] [Revised: 05/01/2014] [Accepted: 05/09/2014] [Indexed: 06/03/2023]
Abstract
The molecular structure and vibrations of 5-[(3-methylphenyl) (phenyl) amino] isophthalic acid (MePIFA) were investigated by infrared and Raman spectroscopies, UV-Vis, (1)H and (13)C NMR spectroscopic techniques and NBO analysis. FT-IR, FT-Raman and dispersive Raman spectra were recorded in the solid phase. (1)H and (13)C NMR spectra and UV-Vis spectrum were recorded in DMSO solution. HOMO-LUMO analysis and molecular electrostatic potential (MEP) analysis were performed. The theoretical calculations for the molecular structure and spectroscopies were performed with DFT (B3LYP) and 6-311G(d,p) basis set calculations using the Gaussian 09 program. After the geometry of the molecule was optimized, vibration wavenumbers and fundamental vibration wavenumbers were assigned on the basis of the potential energy distribution (PED) of the vibrational modes calculated with VEDA 4 program. The total (TDOS), partial (PDOS) density of state and overlap population density of state (OPDOS) diagrams analysis were made using GaussSum 2.2 program. The results of theoretical calculations for the spectra of the title compound were compared with the observed spectra.
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Affiliation(s)
- E Babur Saş
- Department of Physics, Ahi Evran University, Kırsehir, Turkey
| | - M Kurt
- Department of Physics, Ahi Evran University, Kırsehir, Turkey.
| | - M Can
- Department of Engineering Sciences, Faculty of Engineering, Izmir Katip Celebi University, Cigli, 35620 Izmir, Turkey
| | - S Okur
- Izmir Katip Çelebi University, Material Science and Engineering, Çiğli, Izmir, Turkey
| | - S İçli
- Ege University, Solar Energy Institute, 35040 Bornova, Izmir, Turkey
| | - S Demiç
- Izmir Katip Çelebi University, Material Science and Engineering, Çiğli, Izmir, Turkey
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Shailajha S, Rajesh Kannan U, Sheik Abdul Kadhar SP, Isac Paulraj E. Molecular structure, vibrational spectra and (13)C and (1)H NMR spectral analysis of 1-methylnaphthalene by ab initio HF and DFT methods. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 133:720-729. [PMID: 24996214 DOI: 10.1016/j.saa.2014.06.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2014] [Revised: 05/20/2014] [Accepted: 06/03/2014] [Indexed: 06/03/2023]
Abstract
The Fourier transform infrared (FT-IR) and FT-Raman of 1-methylnaphthalene (1MN) have been recorded and analyzed. The equilibrium geometry, bond lengths, bond angles and harmonic vibrational frequencies have been investigated with the help of density functional theory (DFT) method. Vibrational spectroscopic assignments of 1-methylnaphthalene (1MN) are carried out with the help of quantum chemical calculation. The (1)H and (13)C nuclear magnetic resonance (NMR) chemical shifts of the molecule are calculated by the Gauge including atomic orbital (GIAO) method. The molecular stability and bond strength have been investigated by using natural bond orbital analysis (NBO). The assignments of vibrational spectra have been carried out with the help of normal co-ordinate analysis (NCA) following the scaled quantum mechanical force field (SQMFF) methodology. The (1)H and (13)C nuclear magnetic resonance (NMR) chemical shift of the molecular is depend only on the structure of the molecule. The calculated HOMO and LUMO energy shows that charge transfer interactions take place within the molecule. Finally, the calculation results are applied to simulate infrared and Raman spectra of the title compound which show good agreement with observed spectra.
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Affiliation(s)
- S Shailajha
- Department of Physics, Manonmaniam Sundaranar University, Tirunelveli 627012, Tamil Nadu, India.
| | - U Rajesh Kannan
- Department of Physics, Manonmaniam Sundaranar University, Tirunelveli 627012, Tamil Nadu, India
| | - S P Sheik Abdul Kadhar
- Department of Physics, Manonmaniam Sundaranar University, Tirunelveli 627012, Tamil Nadu, India
| | - E Isac Paulraj
- Department of Physics, Pallavan College of Engineering, Kancheepuram 631502, Tamil Nadu, India
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Sachan AK, Pathak SK, Chand S, Srivastava R, Prasad O, Belaidi S, Sinha L. Molecular structure, vibrational and electronic properties of 4-Phenyl-3H-1,3-thiazol-2-ol using density functional theory and comparison of drug efficacy of keto and enol forms by QSAR analysis. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 132:568-581. [PMID: 24892536 DOI: 10.1016/j.saa.2014.05.011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2014] [Revised: 04/23/2014] [Accepted: 05/02/2014] [Indexed: 06/03/2023]
Abstract
4-Phenyl-3H-1,3-thiazol-2-ol can exist in two tautomeric forms - keto and enol. Comprehensive investigation of molecular geometry and electronic structure in ground as well as in the first excited state of 4-Phenyl-3H-1,3-thiazol-2-ol (enol) has been carried out. To determine lowest-energy molecular conformation of the title molecule, the selected torsion angles were varied in steps of 10° and molecular energy profile was calculated from -180° to +180°. Experimental FT-IR and FT-Raman spectra of title compound were compared with the spectral data obtained by DFT/B3LYP method. Dipole moment, polarizability, first static hyperpolarizability and molecular electrostatic potential surface map have been calculated to get a better insight of the properties of title molecule. Natural bond orbital (NBO) analysis has been done to study the stability of the molecule arising from charge delocalization. UV-Vis spectrum of the title compound was also recorded and electronic properties such as frontier orbitals and band gap energies were calculated by TD-DFT approach. To compare the drug efficacy of enolic and keto forms, QSAR properties of both forms have also been computed and discussed.
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Affiliation(s)
- Alok K Sachan
- Department of Physics, University of Lucknow, 226007 Lucknow, India
| | | | - Satish Chand
- Department of Physics, University of Lucknow, 226007 Lucknow, India
| | - Ruchi Srivastava
- Department of Physics, University of Lucknow, 226007 Lucknow, India
| | - Onkar Prasad
- Department of Physics, University of Lucknow, 226007 Lucknow, India
| | - Salah Belaidi
- Group of Computational and Pharmaceutical Chemistry, LMCE Laboratory, Faculty of Sciences, University of Biskra, 07000 Biskra, Algeria
| | - Leena Sinha
- Department of Physics, University of Lucknow, 226007 Lucknow, India.
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Boobalan MS, Amaladasan M, Tamilvendan D, Ramalingam S, Venkatesa Prabhu G. In Silico vibrational spectroscopic investigation on antioxidant active Mannich base 1-[anilino (phenyl) methyl] pyrrolidine-2,5-dione. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 131:303-318. [PMID: 24835933 DOI: 10.1016/j.saa.2014.04.135] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2014] [Revised: 04/01/2014] [Accepted: 04/14/2014] [Indexed: 06/03/2023]
Abstract
The antioxidant active Mannich base 1-[anilino (phenyl) methyl] pyrrolidine-2,5-dione (APMPD) have been synthesized and its FT-IR and FT-Raman vibrational spectra were recorded within the region of 4000cm(-1), 50cm(-1) respectively. The molecular geometric parameters of APMPD have been computed using HF and DFT model theories. The energies of APMPD are calculated for all the eight possible conformers using B3LYP method at 6-311++G(d,p) basis set. From the computational results, the M1 conformer was identified as the most stable conformer of APMPD. The stable conformer was compared with experimental crystal geometry, which again fortifies the results of conformer analysis. The fundamental vibrations of the molecule are assigned according to the characteristic region and the literature report. The predicted highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy gap provide vivid idea on charge transfer behavior of APMPD. The molecular electrostatic potential (MEP) and Mulliken charge analysis indicate the feasible electrophilic and nucleophilic reactive sites on APMPD. The thermodynamic properties (heat capacity, entropy, and enthalpy) of the title compound at various temperatures are calculated in gas phase.
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Affiliation(s)
- Maria susai Boobalan
- Department of Chemistry, St. Joseph's College, Tiruchirapalli, Tamil Nadu, India; Department of Chemistry, Roever Engineering College, Perambalur, Tamil Nadu, India.
| | - M Amaladasan
- Department of Chemistry, St. Joseph's College, Tiruchirapalli, Tamil Nadu, India
| | - D Tamilvendan
- Department of Chemistry, National Institute of Technology, Tiruchirapalli, Tamil Nadu, India
| | - S Ramalingam
- Department of Physics, A.V.C. College, Mayiladuthurai, Tamil Nadu, India
| | - G Venkatesa Prabhu
- Department of Chemistry, National Institute of Technology, Tiruchirapalli, Tamil Nadu, India
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Unal M, Yang S, Akkus O. Molecular spectroscopic identification of the water compartments in bone. Bone 2014; 67:228-36. [PMID: 25065717 DOI: 10.1016/j.bone.2014.07.021] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/02/2014] [Revised: 07/15/2014] [Accepted: 07/16/2014] [Indexed: 11/25/2022]
Abstract
Matrix bound water is a correlate of bone's fracture resistance and assessment of bound water is emerging as a novel measure of bone's mechanical integrity. Raman spectroscopy is one of the few nondestructive modalities to assess the hydration status in bone; however, it has not been used to study the OH-band in bone. A sequential dehydration protocol was developed to replace unbound (heat drying) and bound (ethanol or deuterium) water in bone. Raman spectra were collected serially to track the OH-band during dehydration. Spectra of synthetic hydroxyapatite, demineralized bone and bulk water were collected to identify mineral and collagen contributions to the OH-band. Band assignments were supported by computational simulations of the molecular vibrations of Gly-Pro-Hyp amino acid sequence. Experimentally and theoretically obtained spectra were interpreted for band-assignments. Water loss was measured gravimetrically and correlated to Raman intensities. Four peaks were identified to be sensitive to dehydration: 3220cm(-1) (water), 3325cm(-1) (NH and water), 3453cm(-1) (hydroxyproline and water), and 3584cm(-1) (mineral and water). These peaks were differentially sensitive to deuterium treatment such that some water peaks were replaced with deuterium oxide faster than the rest. Specifically, the peaks at 3325 and 3584cm(-1) were more tightly bound to the matrix than the remaining bands. Comparison of dehydration in mineralized and demineralized bone revealed a volume of water that may be locked in the matrix by mineral crystals. The OH-range of bone was dominated by collagen and the water since the spectral profile of dehydrated demineralized bone was similar to that of the mineralized bone. Furthermore, water associates to bone mainly by collagen as findings of experimentally and theoretically spectra. The current work is among the first thorough analysis of the Raman OH stretch band in bone and such spectral information may be used to understand the involvement of water in the fragility of aging and in diseased bone.
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Affiliation(s)
- Mustafa Unal
- Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, OH 44106, USA.
| | - Shan Yang
- Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, OH 44106, USA.
| | - Ozan Akkus
- Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, OH 44106, USA; Department of Orthopaedics, Case Western Reserve University, Cleveland, OH 44106, USA; Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH 44106, USA.
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A computational perspective on equilibrium geometry, vibrational spectra and electronic structure of antioxidant active Mannich base 1-[(Pyridin-2-yl amino) methyl] pyrrolidine-2,5-dione. J Mol Struct 2014. [DOI: 10.1016/j.molstruc.2014.04.091] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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42
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Sert Y, Mahendra M, Shivashankar K, Puttaraju KB, Doğan H, Çırak Ç, Ucun F. Vibrational spectroscopy investigation using M06-2X and B3LYP methods analysis on the structure of 2-Trifluoromethyl-10H-benzo[4,5]-imidazo[1,2-a]pyrimidin-4-one. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 128:109-118. [PMID: 24662759 DOI: 10.1016/j.saa.2014.02.125] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2014] [Revised: 02/01/2014] [Accepted: 02/19/2014] [Indexed: 06/03/2023]
Abstract
In this study, the experimental and theoretical vibrational frequencies of a newly synthesized bioactive agent namely, 2-Trifluoromethyl-10H-benzo[4,5]-imidazo[1,2-a]pyrimidin-4-one (TIP) have been investigated. The experimental FT-IR (4000-400 cm(-1)) and Laser-Raman spectra (4000-100 cm(-1)) of the molecule in solid phase have been recorded. The theoretical vibrational frequencies and the optimized geometric parameters (bond lengths and bond angles) have been calculated using density functional theory (DFT/B3LYP: Becke, 3-parameter, Lee-Yang-Parr) and M06-2X (the highly parametrized, empirical exchange correlation function) quantum chemical methods with 6-311++G(d,p) basis set by Gaussian 09W software, for the first time. The assignments of the vibrational frequencies have been done by potential energy distribution (PED) analysis using VEDA 4 software. The theoretical optimized geometric parameters and vibrational frequencies have been found to be in good agreement with the corresponding experimental data and results in the literature. In addition, the highest occupied molecular orbital (HOMO) energy, the lowest unoccupied molecular orbital (LUMO) energy and the other related molecular energy values of the compound have been investigated using the same theoretical calculations.
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Affiliation(s)
- Yusuf Sert
- Department of Physics, Faculty of Art & Sciences, Bozok University, Yozgat 66100, Turkey; Sorgun Vocational School, Bozok University, Yozgat 66100, Turkey.
| | - M Mahendra
- Department of Studies in Physics, Manasagangotri, University of Mysore, Mysore 570 006, India
| | - K Shivashankar
- P.G. Department of Chemistry, Central College Campus, Bangalore University, Bangalore 560 001, India
| | - K B Puttaraju
- P.G. Department of Chemistry, Central College Campus, Bangalore University, Bangalore 560 001, India
| | - H Doğan
- Department of Physics, Faculty of Art & Sciences, Bozok University, Yozgat 66100, Turkey
| | - Çagrı Çırak
- Department of Physics, Faculty of Art & Sciences, Erzincan University, Erzincan 24100, Turkey
| | - Fatih Ucun
- Department of Physics, Faculty of Art & Sciences, Süleyman Demirel University, Isparta 32100, Turkey
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Sert Y, El-Emam AA, Al-Abdullah ES, Al-Tamimi AMS, Çırak Ç, Ucun F. Use of vibrational spectroscopy to study 4-benzyl-3-(thiophen-2-yl)-4,5-dihydro-1H-1,2,4-triazole-5-thione: A combined theoretical and experimental approach. SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 126:280-90. [PMID: 24608012 DOI: 10.1016/j.saa.2014.01.142] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2013] [Revised: 01/21/2014] [Accepted: 01/27/2014] [Indexed: 10/25/2022]
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Saravanan S, Balachandran V, Vishwanathan K. Conformational stability, molecular orbital studies (chemical hardness and potential), vibrational investigation and theoretical NBO analysis of 4-tert-butyl-3-methoxy-2,6-dinitrotoluene. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 124:451-469. [PMID: 24508884 DOI: 10.1016/j.saa.2014.01.059] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2013] [Revised: 12/10/2013] [Accepted: 01/10/2014] [Indexed: 06/03/2023]
Abstract
The FT-IR and FT-Raman spectra of 4-tert-butyl-3-methoxy-2,6-dinitrotoluene (musk ambrette) have been recorded in the regions 4000-400 cm(-1) and 3500-100 cm(-1), respectively. The total energy calculations of musk ambrette were tried for the possible conformers. The molecular structure, geometry optimization, vibrational frequencies were obtained by the density functional theory (DFT) using B3LYP and LSDA method with 6-311G(d,p) basis set for the most stable conformer "C1". The complete assignments were performed on the basis of the potential energy distribution (PED) of the vibrational modes, calculated and the scaled values were compared with experimental FT-IR and FT-Raman spectra. The observed and the calculated frequencies are found to be in good agreement. The stability of the molecule arising from hyper conjugate interactions and the charge delocalization has been analyzed using bond orbital (NBO) analysis. The HOMO and LUMO energy gap reveals that the energy gap reflects the chemical activity of the molecule. The dipole moment (μ), polarizability (α), anisotropy polarizability (Δα) and first hyperpolarizability (βtot) of the molecule have been reported. The thermodynamic functions (heat capacity, entropy and enthalpy) were obtained for the range of temperature 100-1000 K. Information about the size, shape, charge density distribution and site of chemical reactivity of the molecule has been obtained by mapping electron density isosurface with molecular electrostatic potential (MEP).
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Affiliation(s)
- S Saravanan
- Department of Physics, Karpagam University, Coimbatore 641021, India; Department of Physics, JJ College of Arts and Science (Autonomous), Pudukkottai 622422, India
| | - V Balachandran
- PG & Research Department of Physics, AA Government Arts College, Musiri, Tiruchirappalli 621211, India.
| | - K Vishwanathan
- Department of Physics, Karpagam University, Coimbatore 641021, India
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Karthikeyan N, Joseph Prince J, Ramalingam S, Periandy S. Vibrational spectroscopic [FT-IR, FT-Raman] investigation on (2,4,5-Trichlorophenoxy) Acetic acid using computational [HF and DFT] analysis. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 124:165-177. [PMID: 24486865 DOI: 10.1016/j.saa.2013.12.105] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2013] [Accepted: 12/22/2013] [Indexed: 06/03/2023]
Abstract
In the present methodical study, FT-IR, FT-Raman and NMR spectra of the (2,4,5-Trichlorophenoxy) Acetic acid are recorded. The observed fundamental frequencies (IR and Raman) are assigned according to their distinctiveness region. The hybrid computational calculations are carried out by HF and DFT (B3LYP and B3PW91) methods with 6-31++G(d,p) and 6-311++G(d,p) basis sets and the corresponding results are tabulated. The impact of the presence of tri-chlorine atoms in phenyl structure of the compound is investigated. The vibrational sequence pattern of the molecule related to CH2COOH is analyzed. Moreover, (13)C NMR and (1)H NMR are calculated by using the gauge independent atomic orbital (GIAO) method with B3LYP methods and the 6-311++G(d,p) basis set and their spectra are simulated and the chemical shifts related to TMS are compared. A study on the electronic and optical properties; absorption wavelengths, excitation energy, dipole moment and frontier molecular orbital energies, are performed by HF and DFT methods. The Kubo gap of the present compound is calculated related to HOMO and LUMO energies which confirm the occurring of charge transformation between the base and ligand group. Besides frontier molecular orbitals (FMO), molecular electrostatic potential (MEP) was performed. NLO properties related to Polarizability and hyperpolarizability are also discussed.
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Affiliation(s)
- N Karthikeyan
- Department of Physics, Parisutham Institute of Technology and Science, Thanjavur, Tamilnadu, India
| | - J Joseph Prince
- Department of Physics, Anna University, Bit Campus, Tiruchirappalli, Tamilnadu, India
| | - S Ramalingam
- Department of Physics, A.V.C. College, Mayiladuthurai, Tamilnadu, India.
| | - S Periandy
- Department of Physics, Tagore Arts College, Puducherry, India
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Saravanan S, Balachandran V, Viswanathan K. Spectroscopic investigation of 4-nitro-3-(trifluoromethyl)aniline, NBO analysis with 4-nitro-3-(trichloromethyl)aniline and 4-nitro-3-(tribromomethyl)aniline. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 121:685-697. [PMID: 24374555 DOI: 10.1016/j.saa.2013.12.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2013] [Revised: 12/01/2013] [Accepted: 12/04/2013] [Indexed: 06/03/2023]
Abstract
The Fourier transform infrared (FT-IR) and FT-Raman spectra of 4-nitro-3-(trifluoromethyl)aniline (NTFA) were recorded in the regions 4000-400 cm(-1) and 3500-100 cm(-1), respectively. Utilizing the observed FT-IR and FT-Raman data, a complete vibrational assignment and analysis of the fundamental modes of the compounds was carried out. Extensive studies on the vibrational, structural, thermodynamic characteristics as well as the electronic properties of NTFA were carried out using ab initio and DFT methods. In this kind of systems, the position of the substituent group in the benzene ring as well as its electron donor-acceptor capabilities play a very important role on the molecular and electronic properties. The values of the total dipole moment (μ) and the first order hyperpolarizability (β) were computed using B3LYP/6-311++G(d,p) and B3LYP/6-311G(d) calculations. The Mulliken's charges, the natural bonding orbital (NBO) analysis on 4-nitro-3-(trifluoromethyl)aniline, 4-nitro-3-(trichloromethyl)aniline and 4-nitro-3-tribromomethyl)aniline were carried out for various intramolecular interactions that are responsible for the stabilization of the molecule. Thermodynamic functions of the investigated molecule were also computed. The calculated HOMO-LUMO energies show that charge transfer occurs in the molecule. The influence of fluorine, amino and nitro group on the geometry of benzene and its normal modes of vibrations has also been discussed.
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Affiliation(s)
- S Saravanan
- Department of Physics, Karpagam University, Coimbatore 641 021, India; Department of Physics, J.J. College of Arts and Science (Autonomous), Pudukkottai 622 422, India
| | - V Balachandran
- Centre for Research, Department of Physics, AA Government Arts College, Musiri, Tiruchirappalli 621 211, India.
| | - K Viswanathan
- Department of Physics, Karpagam University, Coimbatore 641 021, India
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Gnanasambandan T, Gunasekaran S, Seshadri S. Molecular structure analysis and spectroscopic characterization of carbimazole with experimental (FT-IR, FT-Raman and UV–Vis) techniques and quantum chemical calculations. J Mol Struct 2013. [DOI: 10.1016/j.molstruc.2013.07.055] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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48
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Sudharsana N, Muthunatesan S, Priya GJ, Krishnakumar V, Nagalakshmi R. Experimental and theoretical studies of 2,5-dichloroanilinium picrate. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 121:53-62. [PMID: 24220670 DOI: 10.1016/j.saa.2013.10.047] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2013] [Revised: 10/02/2013] [Accepted: 10/09/2013] [Indexed: 06/02/2023]
Abstract
Organic 2,5-dichloroanilinium picrate crystal was grown by using slow evaporation solution technique. The lattice parameter was estimated by powder X-ray diffraction. The absence of absorption at around Nd:YAG fundamental wavelength was confirmed by ultraviolet-visible absorption study. The vibrational analyses confirm the various functional groups present in the grown crystal. The NMR study confirms the presence of chemical environment of hydrogen in the title crystal. The thermogravimetric (TG), differential thermal analysis (DTA) and differential scanning calorimetry (DSC) traces reveals the thermal stability of the compound. The second harmonic generation (SHG) of the crystal was confirmed by Kurtz Perry powder technique. The theoretical studies such as first-order hyperpolarizability (β), molecular orbitals, electronic excitation and electrostatic potential (ESP) were performed using Gaussian 03W software at HF/6-31G (d) level.
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Affiliation(s)
- N Sudharsana
- Department of Physics, National Institute of Technology, Tiruchirappalli 620 015, India
| | - S Muthunatesan
- Department of Physics, Government Arts College, Kumbakonam, India
| | - G Jasmine Priya
- Department of Physics, National Institute of Technology, Tiruchirappalli 620 015, India
| | - V Krishnakumar
- Department of Physics, Periyar University, Salem 636 011, India
| | - R Nagalakshmi
- Department of Physics, National Institute of Technology, Tiruchirappalli 620 015, India.
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Kıbrız IE, Sert Y, Saçmacı M, Sahin E, Yıldırım I, Ucun F. Synthesis, characterization and vibrational spectra analysis of ethyl (2Z)-2-(2-amino-4-oxo-1,3-oxazol-5(4H)-ylidene)-3-oxo-3-phenylpropanoate. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 114:491-501. [PMID: 23792289 DOI: 10.1016/j.saa.2013.05.022] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2013] [Revised: 05/06/2013] [Accepted: 05/08/2013] [Indexed: 06/02/2023]
Abstract
In the present study, the experimental and theoretical vibrational spectra of ethyl (2Z)-2-(2-amino-4-oxo-1,3-oxazol-5(4H)-ylidene)-3-oxo-3-phenylpropanoate (AOX) were investigated. The experimental FT-IR (400-4000 cm(-1)) and Laser-Raman spectra (100-4000 cm(-1)) of the molecule in the solid phase were recorded. Theoretical vibrational frequencies and geometric parameters (bond lengths, bond angles and torsion angles) were calculated using ab initio Hartree Fock (HF), Density Functional Theory (B3LYP and B3PW91) methods with 6-311++G(d,p) basis set by Gaussian 03 program, for the first time. The computed values of frequencies are scaled using a suitable scale factor to yield good coherence with the observed values. The assignments of the vibrational frequencies were performed by potential energy distribution (PED) analysis by using VEDA 4 program. The theoretical optimized geometric parameters and vibrational frequencies were compared with the corresponding experimental X-ray diffraction data, and they were seen to be in a good agreement with each other. The hydrogen bonding geometry of the molecule was also simulated to evaluate the effect of intermolecular hydrogen bonding on the vibrational frequencies. Also, the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energies were found.
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Affiliation(s)
- Ibrahim Evren Kıbrız
- Department of Chemistry, Faculty of Art & Sciences, Bozok University, Yozgat, Turkey
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50
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Krishnakumar V, Mangaiarkkarasi K, Mathammal R, Prabavathi N, Surumbarkuzhali N. FTIR, FT-Raman and NMR studies on 2,6-dichlorotoluene and 2-chloro-6-fluorotoluene based on density functional theory. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 112:429-439. [PMID: 23728077 DOI: 10.1016/j.saa.2013.04.037] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/25/2012] [Revised: 04/01/2013] [Accepted: 04/10/2013] [Indexed: 06/02/2023]
Abstract
In the present work, we reported a combined experimental and theoretical study on molecular structure and vibrational analysis of 2,6-dichlorotoluene (DCT) and 2-chloro-6-fluorotoluene (CFT). FTIR and FT-Raman spectra of the title compounds in the solid phase are recorded in the region 4000-400 cm(-1) and 4000-50 cm(-1) respectively. The structural and spectroscopic data of the molecules in the ground state is calculated using Hartree-Fock (HF) and density functional methods (B3LYP) with 3-21 and 6-31G* basis sets. The DFT (B3LYP/31G*) calculations have been giving energies, optimized structures, harmonic vibrational frequencies, IR intensities and Raman activities. The study is extended to the HOMO-LUMO analysis to calculate the energy gap, ionization potential, electron affinity, global hardness, chemical potential and thermodynamic properties of DCT and CFT. A complete vibrational assignment aided by the theoretical harmonic frequency analysis has been proposed. The calculated HOMO and LUMO energies show the charge transfer occurs in the molecule. The harmonic vibrational frequencies have been compared experimental FTIR and FT-Raman spectra. The observed and calculated frequencies are found to be in good agreement. The complete vibrational assignments are performed on the basis of the Total Energy Distribution (TED) of the vibrational modes calculated with scaled quantum mechanical (SQM) method. (13)C NMR chemical shifts results are compared with the experimental values. The experimental spectra also coincide satisfactorily with those of theoretically constructed spectrograms.
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Affiliation(s)
- V Krishnakumar
- Department of Physics, Periyar University, Salem 636 011, India.
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