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Hema, Bhatt T, Pant T, Dhondiyal CC, Rana M, Chowdhury P, Joshi GC, Arya P, Tiwari H. Computational study of the intermolecular interactions and their effect on the UV-visible spectra of the ternary liquid mixture of benzene, ethanol and propylene glycol. J Mol Model 2020; 26:268. [PMID: 32926296 DOI: 10.1007/s00894-020-04533-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Accepted: 09/03/2020] [Indexed: 11/30/2022]
Abstract
Quantum chemical calculations are well-equipped to provide answers to the questions regarding the different aspects of intermolecular interactions. We investigate the benzene, ethanol and 1,2 propanediol ternary mixture with theoretical as well as experimental UV-Vis spectroscopy. An extensive theoretical study on the molecular structure and UV-Vis spectral analysis was undertaken using density functional theory (DFT) method. Structural parameter analysis and the HOMO-LUMO (highest occupied molecular orbital-lowest unoccupied molecular orbital) energy gap help to describe the possible interaction between molecules in dimer and in combination. Interaction energy has been calculated from topological study. Time-dependent density functional theory (TDDFT) calculations on dimer/cluster in gas phase help to understand the effect of the molecular interaction on the overall spectral shift and related intensity variation. Our results show that in the ternary mixture, the interaction energies of the interactions are π-π interaction: 0.52-2.57 kcal/mol, Hp-π interaction: 1.15 kcal/mol and H-bonding: 2.49 to 4.46 kcal/mol. The π-π interaction and H-bonding cause red shift in absorption spectra while Hp-π interaction causes blue shift. In the ternary mixture, the strength of different kinds of interaction depends on the concentration, and as each interaction has its own effect on spectral shift, the overall experimental spectra get broader and distorted from the Gaussian shape.
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Affiliation(s)
- Hema
- Department of Physics, M. B. Govt. P. G. College, Haldwani, Uttarakhand, India
| | - Tara Bhatt
- Department of Physics, M. B. Govt. P. G. College, Haldwani, Uttarakhand, India.
| | - Tarun Pant
- Department of Physics, M. B. Govt. P. G. College, Haldwani, Uttarakhand, India
| | - Charu Ch Dhondiyal
- Department of Physics, M. B. Govt. P. G. College, Haldwani, Uttarakhand, India
| | - Meenakshi Rana
- Uttarakhand Open University, Haldwani, Uttarakhand, India
| | - Papia Chowdhury
- Jaypee Institute of Information Technology, Noida, Uttar Pradesh, India
| | - G C Joshi
- G.B. Pant University of Agriculture and Technology, Pantnagar, Uttarakhand, India
| | - Pratibha Arya
- Department of Physics, M. B. Govt. P. G. College, Haldwani, Uttarakhand, India
| | - Himani Tiwari
- Department of Physics, M. B. Govt. P. G. College, Haldwani, Uttarakhand, India
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Kwong HC, Chidan Kumar CS, Mah SH, Mah YL, Chia TS, Quah CK, Lim GK, Chandraju S. Crystal Correlation Of Heterocyclic Imidazo[1,2-a]pyridine Analogues and Their Anticholinesterase Potential Evaluation. Sci Rep 2019; 9:926. [PMID: 30700752 PMCID: PMC6354011 DOI: 10.1038/s41598-018-37486-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Accepted: 12/05/2018] [Indexed: 12/20/2022] Open
Abstract
Imidazo[1,2-a]pyridine-based compounds are clinically important to the treatments of heart and circulatory failures, while many are under development for pharmaceutical uses. In this study, a series of imidazo[1,2-a]pyridine-based derivatives 2(a-o) were synthesized by reacting a-haloketones with 2-aminopyridines in a basic media at ambient temperature. Single crystal X-ray diffraction studies suggest that with low degree-of-freedom, the introduction of bulky adamantyl or electron-rich biphenyl moiety into the imidazopyridine derivatives will not affect its structural occupancy. Imidazo[1,2-a]pyridine-based derivatives with biphenyl side chain are potential AChE inhibitors. Compound 2h which bears a biphenyl side chain and methyl substituent at the position R4 of the imidazo[1,2-a]pyridine ring showed the strongest AChE inhibition with an IC50 value of 79 µM. However, imidazo[1,2-a]pyridine derivatives with phenyl side chain exhibit better BChE inhibition effect among the series. Compound 2j with 3,4-dichlorophenyl side chain and unsubstituted imidazo[1,2-a]pyridine ring appears to be the strongest BChE inhibitor with an IC50 value of 65 µM and good selectivity. The inhibitory effects of active compounds were further confirmed by computational molecular docking studies. The results unveiled that peripheral anionic sites of AChE and acyl pocket of BChE were the predominated binding sites for the subjected inhibitors.
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Affiliation(s)
- Huey Chong Kwong
- School of Chemical Sciences, Universiti Sains Malaysia, Penang, 11800 USM, Malaysia.
| | - C S Chidan Kumar
- Department of Engineering Chemistry, Vidya Vikas Institute of Engineering & Technology, Visvesvaraya Technological University, Alanahalli, Mysuru, 570028, Karnataka, India
| | - Siau Hui Mah
- School of Biosciences, Taylor's University, Lakeside Campus, 47500, Subang Jaya, Selangor, Malaysia
| | - Yew Leng Mah
- Hospital Pulau Pinang, Jalan Residensi, 10990 George Town, Pulau Pinang, Malaysia
| | - Tze Shyang Chia
- X-ray Crystallography Unit, School of Physics, Universiti Sains Malaysia, Penang, 11800 USM, Malaysia
| | - Ching Kheng Quah
- X-ray Crystallography Unit, School of Physics, Universiti Sains Malaysia, Penang, 11800 USM, Malaysia.
| | - Gin Keat Lim
- School of Chemical Sciences, Universiti Sains Malaysia, Penang, 11800 USM, Malaysia
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Cruchter T, Medvedev MG, Shen X, Mietke T, Harms K, Marsch M, Meggers E. Asymmetric Nucleophilic Catalysis with an Octahedral Chiral-at-Metal Iridium(III) Complex. ACS Catal 2017. [DOI: 10.1021/acscatal.7b01296] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Thomas Cruchter
- Fachbereich
Chemie, Philipps-Universität Marburg, Hans-Meerwein-Strasse 4, 35043 Marburg, Germany
| | - Michael G. Medvedev
- X-ray
Structural Laboratory, A.N. Nesmeyanov Institute of Organoelement Compounds RAS, Vavilova St. 28, 119991 Moscow, Russian Federation
- N.D. Zelinsky Institute of Organic Chemistry RAS, Leninsky Prospect 47, 119991 Moscow, Russian Federation
| | - Xiaodong Shen
- Fachbereich
Chemie, Philipps-Universität Marburg, Hans-Meerwein-Strasse 4, 35043 Marburg, Germany
| | - Thomas Mietke
- Fachbereich
Chemie, Philipps-Universität Marburg, Hans-Meerwein-Strasse 4, 35043 Marburg, Germany
| | - Klaus Harms
- Fachbereich
Chemie, Philipps-Universität Marburg, Hans-Meerwein-Strasse 4, 35043 Marburg, Germany
| | - Michael Marsch
- Fachbereich
Chemie, Philipps-Universität Marburg, Hans-Meerwein-Strasse 4, 35043 Marburg, Germany
| | - Eric Meggers
- Fachbereich
Chemie, Philipps-Universität Marburg, Hans-Meerwein-Strasse 4, 35043 Marburg, Germany
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Du QS, Wang QY, Du LQ, Chen D, Huang RB. Theoretical study on the polar hydrogen-π (Hp-π) interactions between protein side chains. Chem Cent J 2013; 7:92. [PMID: 23705926 PMCID: PMC3666963 DOI: 10.1186/1752-153x-7-92] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2013] [Accepted: 05/20/2013] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND In the study of biomolecular structures and interactions the polar hydrogen-π bonds (Hp-π) are an extensive molecular interaction type. In proteins 11 of 20 natural amino acids and in DNA (or RNA) all four nucleic acids are involved in this type interaction. RESULTS The Hp-π in proteins are studied using high level QM method CCSD/6-311 + G(d,p) + H-Bq (ghost hydrogen basis functions) in vacuum and in solutions (water, acetonitrile, and cyclohexane). Three quantum chemical methods (B3LYP, CCSD, and CCSD(T)) and three basis sets (6-311 + G(d,p), TZVP, and cc-pVTZ) are compared. The Hp-π donors include R2NH, RNH2, ROH, and C6H5OH; and the acceptors are aromatic amino acids, peptide bond unit, and small conjugate π-groups. The Hp-π interaction energies of four amino acid pairs (Ser-Phe, Lys-Phe, His-Phe, and Tyr-Phe) are quantitatively calculated. CONCLUSIONS Five conclusion points are abstracted from the calculation results. (1) The common DFT method B3LYP fails in describing the Hp-π interactions. On the other hand, CCSD/6-311 + G(d,p) plus ghost atom H-Bq can yield better results, very close to the state-of-the-art method CCSD(T)/cc-pVTZ. (2) The Hp-π interactions are point to π-plane interactions, possessing much more interaction conformations and broader energy range than other interaction types, such as common hydrogen bond and electrostatic interactions. (3) In proteins the Hp-π interaction energies are in the range 10 to 30 kJ/mol, comparable or even larger than common hydrogen bond interactions. (4) The bond length of Hp-π interactions are in the region from 2.30 to 3.00 Å at the perpendicular direction to the π-plane, much longer than the common hydrogen bonds (~1.9 Å). (5) Like common hydrogen bond interactions, the Hp-π interactions are less affected by solvation effects.
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Affiliation(s)
- Qi-Shi Du
- State Key Laboratory of Non-food Biomass and Enzyme Technology, National Engineering Research Center for Non-food Biorefinery, Guangxi Academy of Sciences, 98 Daling Road, Nanning, Guangxi 530007, China
- Gordon Life Science Institute, San Diego, CA 92130, USA
| | - Qing-Yan Wang
- State Key Laboratory of Non-food Biomass and Enzyme Technology, National Engineering Research Center for Non-food Biorefinery, Guangxi Academy of Sciences, 98 Daling Road, Nanning, Guangxi 530007, China
- Life Science and Biotechnology College, Guangxi University, Nanning, Guangxi, 530004, China
| | - Li-Qin Du
- Life Science and Biotechnology College, Guangxi University, Nanning, Guangxi, 530004, China
| | - Dong Chen
- State Key Laboratory of Non-food Biomass and Enzyme Technology, National Engineering Research Center for Non-food Biorefinery, Guangxi Academy of Sciences, 98 Daling Road, Nanning, Guangxi 530007, China
- Life Science and Biotechnology College, Guangxi University, Nanning, Guangxi, 530004, China
| | - Ri-Bo Huang
- State Key Laboratory of Non-food Biomass and Enzyme Technology, National Engineering Research Center for Non-food Biorefinery, Guangxi Academy of Sciences, 98 Daling Road, Nanning, Guangxi 530007, China
- Life Science and Biotechnology College, Guangxi University, Nanning, Guangxi, 530004, China
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