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Li Y, Wang Y, Feng X, Zhao Y. Spectroscopic and mechanistic insights into solvent mediated excited-state proton transfer and aggregation-induced emission: introduction of methyl group onto 2-( o-hydroxyphenyl)benzoxazole. Phys Chem Chem Phys 2022; 24:26297-26306. [DOI: 10.1039/d2cp03007a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
2-(2-Hydroxy-5-methylphenyl)benzoxazole(HBO-pCH3), a solvatochromic benzoxazole-based probe, exhibited a typical dual fluorescence phenomenon, high fluorescence quantum yield, red-shifted emission and large Stokes’ shift via the ESIPT in solvents.
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Affiliation(s)
- Yu Li
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou, 310018, China
| | - Yuanyue Wang
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou, 310018, China
| | - Xiaoqing Feng
- School of Pharmacy & School of Medicine, Changzhou University, Changzhou 213164, China
| | - Yanying Zhao
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou, 310018, China
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2
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Majumdar D, Elizabeth Philip J, Roy S, Tüzün B. Reinvigorate the synthesis, spectroscopic findings, SEM morphology investigation, and antimicrobial silhouette of contemporary Salen ligands: A comprehensive DFT landscape. RESULTS IN CHEMISTRY 2022. [DOI: 10.1016/j.rechem.2022.100574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
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3
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Ramadan RM, Abo-Aly MM, Lasheen AAM. Molecular structural, vibrational assignments, electronic structure and DFT calculations, and molecular docking of N-benzylideneaniline and N-salicylidene-o-aminoaphenol Schiff bases. INORG NANO-MET CHEM 2021. [DOI: 10.1080/24701556.2021.1988976] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Ramadan M. Ramadan
- Chemistry Department, Faculty of Science, Ain Shams University, Cairo, Egypt
| | - Mohamed M. Abo-Aly
- Chemistry Department, Faculty of Science, Ain Shams University, Cairo, Egypt
| | - Alaa A. M. Lasheen
- Chemistry Department, Faculty of Science, Ain Shams University, Cairo, Egypt
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Petkov N, Ivanova A, Trifonov AA, Buchvarov IC, Stanimirov SS. Transient absorption, femtosecond dynamics, vibrational coherence and molecular modelling of the photoisomerization of N-salicylidene- o-aminophenol in solution. Phys Chem Chem Phys 2021; 23:20989-21000. [PMID: 34519727 DOI: 10.1039/d1cp02339j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This article presents a study of the excited state relaxation dynamics of N-salicylidene-o-aminophenol (SOAP) in ethanol solution. Femtosecond transient absorption (TA) spectroscopy and theoretical calculations are used in combination to establish the mechanism of the excited state relaxation and type of molecular species involved in the accompanying phototransformations. TA spectra show that upon photoexcitation two SOAP tautomers (E-enol and Z-keto) interconvert by ESIPT. The molecule can subsequently isomerize to the E-keto form of SOAP. An intriguing observation is that the TA spectra of this compound in ethanol show modulations of the signal at the stimulated emission spectral range. It is found that these modulations are due to the coherence of the excited ensemble of molecules whose evolution over time represents a moving wave packet. After Fourier transform of the modulations, two characteristic frequencies are identified. These frequencies refer to the corresponding vibrational modes of the excited state and their nature is elucidated by DFT quantum chemical calculations. The obtained experimental and theoretical data reveal the nature of the vibronic coupling between the ground and excited state and the type of molecular vibrations involved in the molecular dynamics along the potential surface of the first excited state at the initial moment right after excitation. These vibrations characterize the starting point in the excited state dynamics of the molecule toward Z-E isomerization of the keto form of SOAP. This study provides a comprehensive picture of the dynamic processes taking place upon photoexcitation of the compound, which might enable control over the various relaxation channels.
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Affiliation(s)
- Nikolai Petkov
- Faculty of Chemistry and Pharmacy, Sofia University, 1 J. Bourchier Blvd., 1164 Sofia, Bulgaria
| | - Anela Ivanova
- Faculty of Chemistry and Pharmacy, Sofia University, 1 J. Bourchier Blvd., 1164 Sofia, Bulgaria
| | - Anton A Trifonov
- John Atanasoff Center for Bio and Nano Photonics (JAC BNP), 1164 Sofia, Bulgaria.
| | - Ivan C Buchvarov
- John Atanasoff Center for Bio and Nano Photonics (JAC BNP), 1164 Sofia, Bulgaria. .,Faculty of Physics, Sofia University, 5 J. Bourchier Blvd., 1164 Sofia, Bulgaria
| | - Stanislav S Stanimirov
- Faculty of Chemistry and Pharmacy, Sofia University, 1 J. Bourchier Blvd., 1164 Sofia, Bulgaria.,John Atanasoff Center for Bio and Nano Photonics (JAC BNP), 1164 Sofia, Bulgaria.
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5
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Iron(III) and cobalt(III) complexes with pentadentate pyridoxal Schiff base ligand – structure, spectral, electrochemical, magnetic properties and DFT calculations. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115019] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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6
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FT-IR and FT-Raman investigation, quantum chemical studies, molecular docking study and antimicrobial activity studies on novel bioactive drug of 1-(2,4-Dichlorobenzyl)-3-[2-(3-(4-chlorophenyl)-5-(4-(propan-2-yl)phenyl-4,5-dihydro-1H-pyrazol-1-yl]-4-oxo-4,5-dihydro-1,3-thiazol-5(4H)-ylidence]-2,3-dihydro-1H-indol-2-one. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2020.128244] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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7
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Yagci NK, Faizi MSH, Aydin AS, Dege N, Dogan OE, Agar E, Mashrai A. Crystal structure, Hirshfeld surface analysis and DFT studies of ( E)-4-methyl-2-{[(4-methyl-phen-yl)imino]-meth-yl}phenol. Acta Crystallogr E Crystallogr Commun 2020; 76:1075-1079. [PMID: 32695455 PMCID: PMC7336782 DOI: 10.1107/s2056989020007847] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Accepted: 06/10/2020] [Indexed: 11/29/2022]
Abstract
In the title compound, C15H15NO, the configuration of the C=N bond of the Schiff base is E, and an intra-molecular O-H⋯N hydrogen bond is observed, forming an intra-molecular S(6) ring motif. The phenol ring is inclined by 45.73 (2)° from the plane of the aniline ring. In the crystal, mol-ecules are linked along the b axis by O-H⋯N and C-H⋯O hydrogen bonds, forming polymeric chains. The Hirshfeld surface analysis of the crystal structure indicates that the most important contributions for the packing arrangement are from H⋯H (56.9%) and H⋯C/C⋯H (31.2%) inter-actions. The density functional theory (DFT) optimized structure at the B3LYP/ 6-311 G(d,p) level is compared with the experimentally determined mol-ecular structure, and the HOMO-LUMO energy gap is provided. The crystal studied was refined as an inversion twin.
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Affiliation(s)
- Nermin Kahveci Yagci
- Kirikkale University, Faculty of Arts and Sciences, Physics Department, 71450 Kirikkale, Turkey
| | - Md. Serajul Haque Faizi
- Department of Chemistry, Langat Singh College, B.R.A. Bihar University, Muzaffarpur, Bihar-842001, India
| | - Alev Sema Aydin
- Department of Chemistry, Faculty of Arts and Sciences, Ondokuz Mayıs University, Samsun, 55200, Turkey
| | - Necmi Dege
- Department of Physics, Faculty of Arts and Sciences, Ondokuz Mayıs University, Samsun, 55200, Turkey
| | - Onur Erman Dogan
- Department of Chemistry, Faculty of Arts and Sciences, Ondokuz Mayıs University, Samsun, 55200, Turkey
| | - Erbil Agar
- Department of Chemistry, Faculty of Arts and Sciences, Ondokuz Mayıs University, Samsun, 55200, Turkey
| | - Ashraf Mashrai
- Faculty of Pharmacy, University of Science and Technology, Ibb Branch, Ibb, Yemen
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Kamaal S, Faizi MSH, Ali A, Ahmad M, Iskenderov T. Crystal structure of 4-[(3-meth-oxy-2-oxidobenzyl-idene)azaniumyl]-benzoic acid methanol monosolvate. Acta Crystallogr E Crystallogr Commun 2018; 74:1847-1850. [PMID: 30574386 PMCID: PMC6281083 DOI: 10.1107/s2056989018016262] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Accepted: 11/16/2018] [Indexed: 11/16/2022]
Abstract
In the crystal of the title compound, C15H13NO4·CH3OH, the Schiff base mol-ecule exists in the zwitterionic form; an intra-molecular N-H⋯O hydrogen bond stabilizes the mol-ecular structure. The benzene rings are nearly co-planar, subtending a dihedral angle of 5.34 (2)°. In the crystal, classical O-H⋯O and weak C-H⋯O hydrogen bonds link the Schiff base mol-ecules and methanol solvent mol-ecules into a three-dimensional supra-molecular architecture. The crystal studied was refined as an inversion twin.
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Affiliation(s)
- Saima Kamaal
- Department of Applied Chemistry, Faculty of Engineering & Technology, Aligarh, Muslim University, Aligarh UP 202002, India
| | - Md. Serajul Haque Faizi
- Department of Chemistry, Langat Singh College, B. R. A. Bihar University, Muzaffarpur, Bihar 842 001, India
| | - Akram Ali
- CMP College Allahabad, a constitution college of Allahabad University, Allahabad, UP, India
| | - Musheer Ahmad
- Department of Applied Chemistry, Faculty of Engineering & Technology, Aligarh, Muslim University, Aligarh UP 202002, India
| | - Turganbay Iskenderov
- National Taras Shevchenko University, Department of Chemistry, Volodymyrska str., 64, 01601 Kyiv, Ukraine
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Rafati A, Ebadi A, Bavafa S, Nowroozi A. Kinetic study, structural analysis and computational investigation of novel xerogel based on drug-PEG/SiO2 for controlled release of enrofloxacin. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.06.104] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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10
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Ghichi N, Benboudiaf A, Bensouici C, DJebli Y, Merazig H. ( E)-2-{[(2-Amino-phen-yl)imino]-meth-yl}-5-(benz-yl-oxy)phenol and ( Z)-3-benz-yl-oxy-6-{[(5-chloro-2-hy-droxy-phen-yl)amino]-methyl-idene}cyclo-hexa-2,4-dien-1-one. Acta Crystallogr E Crystallogr Commun 2018; 74:737-742. [PMID: 29850103 PMCID: PMC5947499 DOI: 10.1107/s2056989018005662] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Accepted: 04/11/2018] [Indexed: 11/12/2022]
Abstract
The title Schiff base compounds, C20H18N2O2 (I) and C20H16ClNO3 (II), were synthesized from 4-benz-yloxy-2-hy-droxy-benzaldehyde by reaction with 1,2-di-amino-benzene for (I), and condensation with 2-amino-4-chloro-phenol for (II). Compound (I) adopts the enol-imine tautomeric form with an E configuration about the C=N imine bond. In contrast, the o-hy-droxy Schiff base (II), is in the keto-imine tautomeric form with a Z configuration about the CH-NH bond. Neither mol-ecule is planar. In (I), the central benzene ring makes dihedral angles of 46.80 (10) and 78.19 (10)° with the outer phenyl-amine and phenyl rings, respectively, while for (II), the corresponding angles are 5.11 (9) and 58.42 (11)°, respectively. The mol-ecular structures of both compounds are affected by the formation of intra-molecular contacts, an O-H⋯N hydrogen bond for (I) and an N-H⋯O hydrogen bond for (II); each contact generates an S(6) ring motif. In the crystal of (I), strong N-H⋯O hydrogen bonds form zigzag chains of mol-ecules along the b-axis direction. Mol-ecules are further linked by C-H⋯π inter-actions and offset π-π contacts and these combine to form a three-dimensional network. The density functional theory (DFT) optimized structure of compound (II), at the B3LYP/6-311+G(d) level, confirmed that the keto tautomeric form of the compound, as found in the structure determination, is the lowest energy form. The anti-oxidant capacities of both compounds were determined by the cupric reducing anti-oxidant capacity (CUPRAC) process.
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Affiliation(s)
- Nadir Ghichi
- Unit of Research CHEMS, University of Constantine 1, Algeria
| | - Ali Benboudiaf
- Unit of Research CHEMS, University of Constantine 1, Algeria
| | | | - Yacine DJebli
- Laboratory of Materials Chemistry,University of Constantine 1, Algeria
| | - Hocine Merazig
- Unit of Research CHEMS, University of Constantine 1, Algeria
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Kuruvilla TK, Prasana JC, Muthu S, George J, Mathew SA. Quantum mechanical and spectroscopic (FT-IR, FT-Raman) study, NBO analysis, HOMO-LUMO, first order hyperpolarizability and molecular docking study of methyl[(3R)-3-(2-methylphenoxy)-3-phenylpropyl]amine by density functional method. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 188:382-393. [PMID: 28756257 DOI: 10.1016/j.saa.2017.07.029] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2016] [Revised: 03/10/2017] [Accepted: 07/18/2017] [Indexed: 06/07/2023]
Abstract
Quantum chemical techniques such as density functional theory (DFT) have become a powerful tool in the investigation of the molecular structure and vibrational spectrum and are finding increasing use in application related to biological systems. The Fourier transform infrared (FT-IR) and Fourier transform Raman (FT-Raman) techniques are employed to characterize the title compound. The vibrational frequencies were obtained by DFT/B3LYP calculations with 6-31G(d,p) and 6-311++G(d,p) as basis sets. The geometry of the title compound was optimized. The vibrational assignments and the calculation of Potential Energy Distribution (PED) were carried out using the Vibrational Energy Distribution Analysis (VEDA) software. Molecular electrostatic potential was calculated for the title compound to predict the reactive sites for electrophilic and nucleophilic attack. In addition, the first-order hyperpolarizability, HOMO and LUMO energies, Fukui function and NBO were computed. The thermodynamic properties of the title compound were calculated at different temperatures, revealing the correlations between heat capacity (C), entropy (S) and enthalpy changes (H) with temperatures. Molecular docking studies were also conducted as part of this study. The paper further explains the experimental results which are in line with the theoretical calculations and provide optimistic evidence through molecular docking that the title compound can act as a good antidepressant. It also provides sufficient justification for the title compound to be selected as a good candidate for further studies related to NLO properties.
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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
| | - Sheril Ann Mathew
- Department of Physics, Madras Christian College, East Tambaram 600059, Tamil Nadu, India
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Insight into the theoretical and experimental studies of 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone N(4)-methyl-N(4)- phenylthiosemicarbazone - A potential NLO material. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.08.078] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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13
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Synthesis, spectral characterization, DFT calculations, antimicrobial activity and molecular docking of 4-bromo-2-((2-hydroxy-5-methylphenylimino)methyl)phenol and its V(V) complex. Inorganica Chim Acta 2017. [DOI: 10.1016/j.ica.2016.10.018] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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14
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Khalaji AD, Fejfarova K, Dušek M. Crystal structures of novel bis-NO-acyclic Schiff base compounds. J STRUCT CHEM+ 2016. [DOI: 10.1134/s0022476615070239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Faizi MSH, Ohui KA, Golenya IA. Crystal structure of 2-{[(E)-(4-anilinophen-yl)iminium-yl]meth-yl}-5-(di-ethyl-amino)-phenolate. ACTA CRYSTALLOGRAPHICA SECTION E-CRYSTALLOGRAPHIC COMMUNICATIONS 2015; 71:1433-5. [PMID: 26870398 PMCID: PMC4719807 DOI: 10.1107/s2056989015019490] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/24/2015] [Accepted: 10/14/2015] [Indexed: 11/29/2022]
Abstract
The title compound, C23H25N3O, crystallized with one single molecule in the asymmetric unit and present in the zwitterionic form. In the crystal, molecules are connected by N—H⋯O hydrogen bonds generating –A–B–A–B– zigzag chains extending along [010]. The chains are linked via C—H⋯π interactions and π–π interactions [with a centroid–centroid distance of 3.444 (3) Å)] between the benzene ring and the imino group of symmetry-related molecules, forming slabs lying parallel to (100). The title compound, C23H25N3O, crystallized with one single molecule in the asymmetric unit and is present in the zwitterionic form. There is an intramolecular N—H⋯O hydrogen bond in the molecule with the phenol ring being inclined to the central benzene ring by 20.67 (14)°. The terminal aminophenyl ring forms a dihedral angle of 54.21 (14)° with the central benzene ring. The two outer aromatic rings are inclined to one another by 74.54 (14)°. In the crystal, the molecules are connected by N—H⋯O hydrogen bonds, with adjacent molecules related by a 21 screw axis, generating –A–B–A–B– zigzag chains extending along [010]. The chains are linked via C—H⋯π and π–π interactions [with a centroid–centroid distance of 3.444 (3) Å] between the benzene ring and the imino group of symmetry-related molecules, forming slabs lying parallel to (100).
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Affiliation(s)
- Md Serajul Haque Faizi
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, UP 208 016, India
| | - Kateryna A Ohui
- National Taras Shevchenko University, Department of Chemistry, Volodymyrska str. 64, 01601 Kyiv, Ukraine
| | - Irina A Golenya
- National Taras Shevchenko University, Department of Chemistry, Volodymyrska str. 64, 01601 Kyiv, Ukraine
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Synthesis, characterization, crystal structure and theoretical studies of new chiral Schiff base (E)-4-hydroxy[(1-phenylethyl)iminomethyl]benzyne. RESEARCH ON CHEMICAL INTERMEDIATES 2015. [DOI: 10.1007/s11164-013-1299-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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17
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Faizi MSH, Prisyazhnaya EV. Crystal structure of N (1)-phenyl-N (4)-[(E)-(pyren-1-yl)methyl-idene]benzene-1,4-di-amine. Acta Crystallogr E Crystallogr Commun 2015; 71:261-3. [PMID: 25844182 PMCID: PMC4350710 DOI: 10.1107/s2056989015001814] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2015] [Accepted: 01/27/2015] [Indexed: 11/16/2022]
Abstract
In the title compound, C29H20N2, the dihedral angles subtended by the central p-phenyl-enedi-amine ring with respect to the mean plane of the terminal pyrenyl ring system (r.m.s. deviation = 0.027 Å) and the terminal N-phenyl ring are 29.34 (4) and 43.43 (7)°, respectively. The conformation about the C=N bond is E. In the crystal, mol-ecules are linked by N-H⋯π and C-H⋯π inter-actions forming chains propagating along the [10-2] direction. These chains are linked via π-π inter-actions [inter-centroid distances are in the range 3.5569 (11)-3.708 (1) Å], forming slabs lying parallel to (30-4).
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Affiliation(s)
| | - Elena V. Prisyazhnaya
- Department of Chemistry, Kyiv National University of Construction and Architecture, Povitroflotsky Avenue 31, 03680 Kiev, Ukraine
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Faizi MSH, Iskenderov TS, Sharkina NO. Crystal structure of (E)-2-{[(4-anilinophen-yl)imino]-meth-yl}phenol. ACTA CRYSTALLOGRAPHICA SECTION E-CRYSTALLOGRAPHIC COMMUNICATIONS 2015; 71:28-30. [PMID: 25705442 PMCID: PMC4331856 DOI: 10.1107/s2056989014026309] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Accepted: 11/30/2014] [Indexed: 11/17/2022]
Abstract
The title compound crystallized with two independent molecules (A and B) in the asymmetric unit, which differ essentially in the orientation of the terminal aminophenyl ring with respect to the central benzene ring. In the crystal, molecules are linked via N—H⋯O hydrogen bonds forming –A-B–A–B– zigzag chains propagating along [010]. The title compound, C19H16N2O, crystallized with two independent molecules (A and B) in the asymmetric unit. There is an intramolecular O—H⋯N hydrogen bond in each molecule with the phenol ring being inclined to the central benzene ring by 4.93 (14) and 7.12 (14)° in molecules A and B, respectively. The conformation of the two molecules differs essentially in the orientation of the terminal aminophenyl ring with respect to the central benzene ring; this dihedral angle is 50.51 (4)° in molecule A and 54.61 (14)° in molecule B. The two outer aromatic rings are inclined to one another by 51.39 (14) and 49.88 (14)° in molecules A and B, respectively. In the crystal, molecules are connected by N—H⋯O hydrogen bonds generating –A-B–A–B– zigzag chains extending along [010]. The chains are linked via C—H⋯π interactions involving neighbouring A molecules, forming slabs lying parallel to (100).
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Affiliation(s)
- Md Serajul Haque Faizi
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, UP 208 016, India
| | - Turganbay S Iskenderov
- National Taras Shevchenko University, Department of Chemistry, Volodymyrska str. 64, 01601 Kyiv, Ukraine
| | - Natalia O Sharkina
- National Taras Shevchenko University, Department of Chemistry, Volodymyrska str. 64, 01601 Kyiv, Ukraine
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Cui S, Wang T, Hu X. Synthesis, characterization, and DFT studies of a new chiral ionic liquid from (S)-1-phenylethylamine. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 133:778-784. [PMID: 25000565 DOI: 10.1016/j.saa.2014.06.057] [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: 01/07/2014] [Revised: 04/15/2014] [Accepted: 06/08/2014] [Indexed: 06/03/2023]
Abstract
A new chiral ionic liquid was synthesized from (S)-1-phenylethylamine and it was studied by IR, Raman, polarimetry, NMR and X-ray crystal diffraction. Its vibrational spectral bands are precisely ascribed to the studied structure with the aid of DFT theoretical calculations. The optimized geometries and calculated vibrational frequencies are evaluated via comparison with experimental values. The vibrational spectral data obtained from IR and Raman spectra are assigned based on the results of the theoretical calculations by the DFT-B3LYP method at 6-311G(d,p) level. The computed vibrational frequencies were scaled by scale factors to yield a good agreement with observed experimental vibrational frequencies.The vibrational modes assignments were performed by using the animation option of GaussView5.0 graphical interface for Gaussian program.
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Affiliation(s)
- Shuya Cui
- College of Chemistry and Chemical Engineering, Mianyang Normal University, Mianyang 621000, China.
| | - Tao Wang
- Department of Chemistry and Chemical Engineering, Heze University, Heze 274015, China
| | - Xiaoli Hu
- College of Chemistry and Chemical Engineering, Mianyang Normal University, Mianyang 621000, China
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Faizi MSH, Mashrai A, Shahid M, Ahmad M. N (1)-[(1H-Imidazol-2-yl)methyl-idene]-N (4)-phenyl-benzene-1,4-di-amine. Acta Crystallogr Sect E Struct Rep Online 2014; 70:o806. [PMID: 25161587 PMCID: PMC4120595 DOI: 10.1107/s1600536814014238] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2014] [Accepted: 06/18/2014] [Indexed: 11/10/2022]
Abstract
The title compound, C16H14N4, is non-planar with dihedral angles between the planes of the imidazole and phenyl-enedi-amine rings of 30.66 (4)° and between the planes of the phenyl-enedi-amine and N-phenyl rings of 56.63 (7)°. In the crystal, mol-ecules are connected by N-H⋯N hydrogen bonds, generating a chain extending along the b-axis direction. The crystal structure is also stabilized by C-H⋯π inter-actions between N-phenyl and imidazole rings and slipped π-π stacking inter-actions between imidazole rings [centroid-centroid distance = 3.516 (4) Å] giving an overall two-dimensional layered structure lying parallel to (010).
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Affiliation(s)
- Md Serajul Haque Faizi
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, UP 208 016, India
| | - Ashraf Mashrai
- Department of Chemistry, Aligarh Muslim University, Aligarh 202 002, India
| | - M Shahid
- Department of Chemistry, Aligarh Muslim University, Aligarh 202 002, India
| | - Musheer Ahmad
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, UP 208 016, India
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21
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Khalaji AD, Mehrani S, Eigner V, Dusek M. Synthesis, experimental and theoretical studies on its crystal structure and FT-IR spectrum of new thiosemicarbazone compound E-2-(4-isopropylbenzylidene)thiosemicarbazone. J Mol Struct 2013. [DOI: 10.1016/j.molstruc.2013.04.041] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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22
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Uma Maheswari J, Muthu S, Sundius T. An experimental and theoretical study of the vibrational spectra and structure of Isosorbide dinitrate. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 109:322-330. [PMID: 23557715 DOI: 10.1016/j.saa.2013.03.031] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2012] [Revised: 02/20/2013] [Accepted: 03/03/2013] [Indexed: 06/02/2023]
Abstract
The present work aims at exploring the vibrational spectra of Isosorbide dinitrate and its chemical activity in a five membered ring system. The FT-IR and FT-Raman spectral studies of the Isosorbide dinitrate (ISDN) were carried out. The equilibrium geometry, various bonding features and harmonic vibrational frequencies of ISDN have been calculated using B3LYP density functional theory (DFT) with 6-31G(d,p) as basis set. The calculated HOMO and LUMO energies and density of states (DOS) show the chemical activity of the molecule. Good correlations between the experimental (1)H and (13)C NMR chemical shifts in methanol-d and calculated GIAO shielding tensors were found. The potential energy surface was studied using the DFT method.
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Affiliation(s)
- J Uma Maheswari
- Sri Chandrasekharendra Saraswathi Viswa Mahavidyalaya, Kanchipuram, Tamil Nadu, India.
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23
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Binoy J, Marchewka MK, Jayakumar VS. The 'partial resonance' of the ring in the NLO crystal melaminium formate: study using vibrational spectra, DFT, HOMO-LUMO and MESP mapping. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 104:97-109. [PMID: 23266682 DOI: 10.1016/j.saa.2012.11.046] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2012] [Revised: 11/09/2012] [Accepted: 11/15/2012] [Indexed: 06/01/2023]
Abstract
The molecular geometry and vibrational spectral investigations of melaminium formate, a potential material known for toxicity and NLO activity, has been performed. The FT IR and FT Raman spectral investigations of melaminium formate is performed aided by the computed spectra of melaminium formate, triazine, melamine, melaminium and formate ion, along with bond orders and PED, computed using the density functional method (B3LYP) with 6-31G(d) basis set and XRD data, to reveal intermolecular interactions of amino groups with neighbor formula units in the crystal, intramolecular H⋯H repulsion of amino group hydrogen with protonating hydrogen, consequent loss of resonance in the melaminium ring, restriction of resonance to N(3)C(1)N(1) moiety leading to special type resonance of the ring and the resonance structure of CO(2) group of formate ion. The 3D matrix of hyperpolarizability tensor components has been computed to quantify NLO activity of melamine, melaminium and melaminium formate and the hyperpolarizability enhancement is analyzed using computed plots of HOMO and LUMO orbitals. A new mechanism of proton transfer responsible for NLO activity has been suggested, based on anomalous IR spectral bands in the high wavenumber region. The computed MEP contour maps have been used to analyze the interaction of melaminium and formate ions in the crystal.
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Affiliation(s)
- J Binoy
- Department of Physics, Government College, Nedumangadu, Thiruvananthapuram 695 541, Kerala, India.
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24
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Khalaji AD, Fejfarová K, Dušek M. 4-[(E)-(4-Eth-oxy-phen-yl)imino-meth-yl]phenol. Acta Crystallogr Sect E Struct Rep Online 2012; 68:o2646. [PMID: 22969545 PMCID: PMC3435674 DOI: 10.1107/s1600536812034253] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2012] [Accepted: 08/01/2012] [Indexed: 11/10/2022]
Abstract
In the title compound, C15H15NO2, the dihedral angle between the benzene rings is 52.04 (5)° and the molecule has an E conformation about the central C=N bond. In the crystal, molecules are connected by O—H⋯N hydrogen bonds, forming zigzag chains along the b axis. The crystal packing also features weak C—H⋯O interactions.
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25
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Fejfarová K, Dušek M, Maghsodlou Rad S, Khalaji AD. (E)-4-[(4-Bromo-phen-yl)imino-meth-yl]-2-meth-oxy-phenol. Acta Crystallogr Sect E Struct Rep Online 2012; 68:o2466. [PMID: 22904909 PMCID: PMC3414922 DOI: 10.1107/s1600536812031704] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2012] [Accepted: 07/11/2012] [Indexed: 11/21/2022]
Abstract
In the crystal structure of the title compound, C14H12BrNO2, the dihedral angle between the rings is 37.87 (10)° and the molecule has an E conformation about the central C=N bond. In the crystal, molecules are connected by intermolecular O—H⋯N hydrogen bonds into zigzag chains running parallel to the b axis. The packing also features C—H⋯O interactions.
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