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Zhao R, Xu X, Zhou Y, Wang Z, Zhou Y. Study on the structural characteristics and interaction mechanisms of ionic liquid mixtures with a common imidazolium cation. J Mol Liq 2023. [DOI: 10.1016/j.molliq.2023.121743] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
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2
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Parlak C, Alver Ö, Ouma CNM, Rhyman L, Ramasami P. Interaction between favipiravir and hydroxychloroquine and their combined drug assessment: in silico investigations. ACTA ACUST UNITED AC 2021; 76:1471-1478. [PMID: 34744292 PMCID: PMC8562770 DOI: 10.1007/s11696-021-01946-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Accepted: 10/22/2021] [Indexed: 12/23/2022]
Abstract
Hydroxychloroquine (HCQ) and favipiravir (FPV) are known to be effective antivirals, and there are reports about their use to fight the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) despite that these are not conclusive. The use of combined drugs is common in drug discovery, and thus, we investigated HCQ and FPV as a combined drug. The density functional theory method was used for the optimization of geometries, spectroscopic analysis and calculation of reactivity parameters. The quantum theory of atoms in molecules was applied to explain the nature of the hydrogen bonds and confirm the higher stability of the combined drug. We also evaluated the absorption, distribution, metabolism and excretion (ADME) parameters to assess their drug actions jointly using SwissADME. The preliminary findings of our theoretical study are promising for further investigations of more potent and selective antiviral drugs.
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Affiliation(s)
- Cemal Parlak
- Department of Physics, Science Faculty, Ege University, Izmir, 35100 Turkey
| | - Özgür Alver
- Department of Physics, Science Faculty, Eskisehir Technical University, Eskisehir, Turkey
| | - Cecil Naphtaly Moro Ouma
- HySA-Infrastructure CoC, Faculty of Engineering, North-West University, Private Bag X6001, Potchefstroom, 2531 South Africa
| | - Lydia Rhyman
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit, 80837 Mauritius.,Centre for Natural Product Research, Department of Chemical Sciences, University of Johannesburg, Doornfontein Campus, Johannesburg, 2028 South Africa
| | - Ponnadurai Ramasami
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit, 80837 Mauritius.,Centre for Natural Product Research, Department of Chemical Sciences, University of Johannesburg, Doornfontein Campus, Johannesburg, 2028 South Africa
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3
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Intermolecular interaction study of l-Threonine in polar aprotic Solvent: Experimental and theoretical study. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116689] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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4
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Nandi R, Jain V, Devi M, Gupta T, Pal SK. Hydrogen bond assisted anchoring transitions in nematic liquid crystals at the aqueous interface. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.126952] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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5
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Elucidating the Aromatic Properties of Covalent Organic Frameworks Surface for Enhanced Polar Solvent Adsorption. Polymers (Basel) 2021; 13:polym13111861. [PMID: 34205141 PMCID: PMC8199954 DOI: 10.3390/polym13111861] [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: 04/28/2021] [Revised: 05/08/2021] [Accepted: 05/09/2021] [Indexed: 11/17/2022] Open
Abstract
Covalent organic frameworks (COFs) have a distinguished surface as they are mostly made by boron, carbon, nitrogen and oxygen. Many applications of COFs rely on polarity, size, charge, stability and hydrophobicity/hydrophilicity of their surface. In this study, two frequently used COFs sheets, COF-1 and covalent triazine-based frameworks (CTF-1), are studied. In addition, a theoretical porous graphene (TPG) was included for comparison purposes. The three solid sheets were investigated for aromaticity and stability using quantum mechanics calculations and their ability for water and ethanol adsorption using molecular dynamics simulations. COF-1 demonstrated the poorest aromatic character due to the highest energy delocalization interaction between B–O bonding orbital of sigma type and unfilled valence-shell nonbonding of boron. CTF-1 was identified as the least kinetically stable and the most chemically reactive. Both COF-1 and CTF-1 showed good surface properties for selective adsorption of water via hydrogen bonding and electrostatic interactions. Among the three sheets, TPG’s surface was mostly affected by aromatic currents and localized π electrons on the phenyl rings which in turn made it the best platform for selective adsorption of ethanol via van der Waals interactions. These results can serve as guidelines for future studies on solvent adsorption for COFs materials.
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Roelianto M, Wahjuningrum DA, Pamungkas YB, Zubaidah N, Permatasari RI, Dianti E. In vivo Study of Sealing Capability of Raw Propolis Extract and Calcium Hydroxide on Dentin Surface. Clin Cosmet Investig Dent 2020; 12:335-341. [PMID: 32884357 PMCID: PMC7442967 DOI: 10.2147/ccide.s243714] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Accepted: 07/31/2020] [Indexed: 01/30/2023] Open
Abstract
Aim This research aimed to investigate the differences in the sealing capability of propolis extracts and Ca(OH)2 on dentin surfaces. Materials and Methods Eighteen mandible incisors of Wistar rats were prepared at a depth of 0.5 mm after which they were randomly divided into 3 groups (n=6) including control (C), pulp-capped with Ca(OH)2 group (P1), and indirect pulp-capped with propolis extract group (P2). All the cavities were sealed with glass ionomer restorative cement. Moreover, the sections of the teeth were obtained after six Wistar Rats from each group were sacrificed on the second day after treatment. The rats’ incisors were cleaved transversally to the area where Ca(OH)2 and propolis extract bonded with dentin for the SEM (scanning electron microscope) analysis and examined using microphotographs test with 5000x magnification. All the samples were measured and examined with spectrophotometry test to determine the bonding distance between Ca(OH)2 and dentin, as well as propolis extract and dentin. The result from the two tests was analyzed with SPSS using an independent t-test at p <0.05. Results There were significant differences between the calcium hydroxide and propolis extract groups (p<0.05) based on the results obtained in the form of spectrums chemical functional groups of spectrophotometry examination. No new chemical bonding or compound was also observed to have been formed between propolis extract with dentin as well as calcium hydroxide with dentin. Conclusion The adaptation or sealing capability of propolis extract was found to be better than calcium hydroxide to the dentin surface.
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Affiliation(s)
- Muhamad Roelianto
- Department of Conservative Dentistry, Faculty of Dental Medicine, Universitas Airlangga, Surabaya, Jawa Timur 60132, Indonesia
| | - Dian Agustin Wahjuningrum
- Department of Conservative Dentistry, Faculty of Dental Medicine, Universitas Airlangga, Surabaya, Jawa Timur 60132, Indonesia
| | - Yusuf Bagus Pamungkas
- Department of Conservative Dentistry, Faculty of Dental Medicine, Universitas Airlangga, Surabaya, Jawa Timur 60132, Indonesia
| | - Nanik Zubaidah
- Department of Conservative Dentistry, Faculty of Dental Medicine, Universitas Airlangga, Surabaya, Jawa Timur 60132, Indonesia
| | - Ryza Indah Permatasari
- Department of Conservative Dentistry, Faculty of Dental Medicine, Universitas Airlangga, Surabaya, Jawa Timur 60132, Indonesia
| | - Eska Dianti
- Department of Conservative Dentistry, Faculty of Dental Medicine, Universitas Airlangga, Surabaya, Jawa Timur 60132, Indonesia
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Abstract
![]()
As
a field, computational toxicology is concerned with using in silico models to predict and understand the origins of
toxicity. It is fast, relatively inexpensive, and avoids the ethical
conundrum of using animals in scientific experimentation. In this
perspective, we discuss the importance of computational models in
toxicology, with a specific focus on the different model types that
can be used in predictive toxicological approaches toward mutagenicity
(SARs and QSARs). We then focus on how quantum chemical methods, such
as density functional theory (DFT), have previously been used in the
prediction of mutagenicity. It is then discussed how DFT allows for
the development of new chemical descriptors that focus on capturing
the steric and energetic effects that influence toxicological reactions.
We hope to demonstrate the role that DFT plays in understanding the
fundamental, intrinsic chemistry of toxicological reactions in predictive
toxicology.
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Affiliation(s)
- Piers A Townsend
- Centre for Sustainable Chemical Technologies, Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, United Kingdom
| | - Matthew N Grayson
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, United Kingdom
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8
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Mohammed A, Zurek J, Madueke S, Al-Kassimy H, Yaqoob M, Houacine C, Ferraz A, Kalgudi R, Zariwala MG, Hawkins N, Al-Obaidi H. Generation of High Dose Inhalable Effervescent Dispersions against Pseudomonas aeruginosa Biofilms. Pharm Res 2020; 37:150. [PMID: 32686026 PMCID: PMC7369260 DOI: 10.1007/s11095-020-02878-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Accepted: 07/08/2020] [Indexed: 11/29/2022]
Abstract
PURPOSE Novel particle engineering approach was used in this study to generate high dose inhalable effervescent particles with synergistic effects against Pseudomonas aeruginosa biofilms. METHODS Spray dried co-amorphous salt of ciprofloxacin (CFX) and tartaric acid (TA) was prepared and coated with external layer of sodium bicarbonate and silica coated silver nanobeads. Design of experiments (DOE) was used to optimize physicochemical properties of particles for enhanced lung deposition. RESULTS Generated particles were co-amorphous CFX/TA showing that CFX lost its zwitterionic form and exhibiting distinct properties to CFX/HCl as assessed by FTIR and thermal analysis. Particles exhibited mass mean aerodynamic diameter (MMAD) of 3.3 μm, emitted dose of 78% and fine particle dose of 85%. Particles were further evaluated via antimicrobial assessment of minimum inhibitory concentrations (MIC) and minimum biofilm eradication concentration (MBEC). MIC and MBEC results showed that the hybrid particles were around 3-5 times more effective when compared to CFX signifying that synergistic effect was achieved. Diffusing wave spectroscopy results showed that the silver containing particles had a disruptive effect on rheological properties as opposed to silver free particles. CONCLUSIONS Overall, these results showed the potential to use particle engineering to generate particles that are highly disruptive of bacterial biofilms.
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Affiliation(s)
- Aram Mohammed
- The School of Pharmacy, University of Reading, Reading, RG6 6AD, UK
| | - Jakub Zurek
- The School of Pharmacy, University of Reading, Reading, RG6 6AD, UK
| | - Somto Madueke
- The School of Pharmacy, University of Reading, Reading, RG6 6AD, UK
| | | | | | - Chahinez Houacine
- School of Pharmacy and Biomedical Sciences, University of Central Lancashire, Preston, PR1 2HE, UK
| | - Amina Ferraz
- School of Pharmacy and Biomedical Sciences, University of Central Lancashire, Preston, PR1 2HE, UK
| | - Rachith Kalgudi
- School of Life Sciences, University of Westminster, 115 New Cavendish Street, London, W1W 6UW, UK
| | - Mohammed Gulrez Zariwala
- School of Life Sciences, University of Westminster, 115 New Cavendish Street, London, W1W 6UW, UK
| | - Nicholas Hawkins
- Department of Engineering Science, University of Oxford, Parks Road, 0X1 3PJ, Oxford, UK
| | - Hisham Al-Obaidi
- The School of Pharmacy, University of Reading, Reading, RG6 6AD, UK.
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9
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Pakdel M, Raissi H, Hosseini ST. Evaluation the synergistic antitumor effect of methotrexate-camptothecin codelivery prodrug from self-assembly process to acid-catalyzed both drugs release: A comprehensive theoretical study. J Comput Chem 2020; 41:1486-1496. [PMID: 32190916 DOI: 10.1002/jcc.26192] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2019] [Revised: 12/10/2019] [Accepted: 03/09/2020] [Indexed: 12/19/2022]
Abstract
Therapeutic efficiency of amphiphilic methotrexate-camptothecin (MTX-CPT) prodrug compared to free drug mixture (MTX/CPT) has been investigated using all-atom molecular dynamics simulation and first principles density functional theory calculations. This comparison revealed that MTX-CPT prodrug tends to form spherical self-assembled nanoparticle (NP), while free MTX/CPT mixture forms rod-shape NP. These observations are attributed to a structural defect in the MTX-CPT prodrug and solvation free energies of MTX, CPT and MTX-CPT molecules. The results provided evidence that noncovalent interactions (NCIs) among the pharmaceutical drugs play a very important role in anticancer agents aggregation process, leading to enhanced stability of the self-assembled NPs. It is found that the stability of MTX-CPT self-assembled NP is greater than the MTX/CPT NP due to the synergistic effect of hydrogen bonding between monomers and solvent (water). Moreover, the noncatalyzed as well as catalyzed hydrolysis reactions of MTX-CPT prodrug are theoretically studied at the PCM(water)//M06-2X/6-31G(d,p) computational level to shed additional light on the role of acidic condition in tumor tissues. We found that the ester hydrolysis in mild acidic solutions is a concerted reaction. In an agreement between theory and experiment, we also confirmed that the activation energies of the catalyzed-hydrolysis steps are much lower than the activation energies of the corresponding steps in the noncatalyzed reaction. Thus, the MTX-CPT prodrug reveals very promising properties as a pH-controlled drug delivery system.
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Affiliation(s)
- Majid Pakdel
- Department of Chemistry, Faculty of Science, University of Birjand, Birjand, Iran
| | - Heidar Raissi
- Department of Chemistry, Faculty of Science, University of Birjand, Birjand, Iran
| | - Seyede T Hosseini
- Department of Chemistry, Faculty of Science, University of Birjand, Birjand, Iran
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10
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Vadra N, Suarez SA, Slep LD, Manzano VE, Halac EB, Baggio RF, Cukiernik FD. Synthesis and crystallographic, spectroscopic and computational characterization of 3,3',4,4'-substituted biphenyls: effects of OR substituents on the intra-ring torsion angle. ACTA CRYSTALLOGRAPHICA SECTION B, STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS 2020; 76:366-377. [PMID: 32831257 DOI: 10.1107/s2052520620004102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Accepted: 03/24/2020] [Indexed: 06/11/2023]
Abstract
Presented here are the synthesis, characterization and study (using single crystal X-ray diffraction, Raman scattering, quantum mechanics calculations) of the structures of a series of biphenyls substituted in positions 3, 3', 4 and 4' with a variety of R (R = methyl, acetyl, hexyl) groups connected to the biphenyl core through oxygen atoms. The molecular conformation, particularly the torsion angle between aromatic rings has been extensively studied both in the solid as well as in the liquid state. The results show that the compounds appearing as rigorously planar in the solid present instead a twisted conformation in the melt. The solid versus melt issue strongly suggests that the reasons for planarity are to be found in the packing restraints. A `rule of thumb' is suggested for the design of biphenyls with different molecular conformations, based on the selection of the OR substituent.
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Affiliation(s)
- Nahir Vadra
- INQUIMAE, CONICET and Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II - Ciudad Universitaria - Núñez (C1428EHA), CABA, Argentina
| | - Sebastian A Suarez
- INQUIMAE, CONICET and Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II - Ciudad Universitaria - Núñez (C1428EHA), CABA, Argentina
| | - Leonardo D Slep
- INQUIMAE, CONICET and Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II - Ciudad Universitaria - Núñez (C1428EHA), CABA, Argentina
| | - Veronica E Manzano
- INQUIMAE, CONICET and Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II - Ciudad Universitaria - Núñez (C1428EHA), CABA, Argentina
| | - Emilia B Halac
- Gerencia de Investigación y Aplicaciones, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Buenos Aires, Argentina
| | - Ricardo F Baggio
- Gerencia de Investigación y Aplicaciones, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Buenos Aires, Argentina
| | - Fabio D Cukiernik
- INQUIMAE, CONICET and Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II - Ciudad Universitaria - Núñez (C1428EHA), CABA, Argentina
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11
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Pei L, Li DZ, Zhang LJ. Theoretical insights into the hydrogen bonding interaction in the complexation of epinephrine with uracil. J Mol Model 2019; 25:252. [PMID: 31353431 DOI: 10.1007/s00894-019-4123-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Accepted: 07/04/2019] [Indexed: 11/28/2022]
Abstract
The present study is aimed at probing the hydrogen bonding interaction between epinephrine and uracil by means of density functional theory calculations concerning their complexation's geometries, interaction energies, and vibrational frequencies. Geometry optimization was carried out giving 19 stable geometries of epinephrine-uracil complex with interaction energies in a range of - 21.51 to - 62.37 kJ mol-1 using the basis set superposition error (BSSE) correction. The analysis of structure and vibration shows that the hydrogen bonding elongates the length of corresponding bond O(N)-H and decreases the symmetric stretching vibrational frequency, which indicates red-shifted H-bonding interactions in all the geometries. Additionally, the analysis with theories of natural bond orbital (NBO), atoms in molecules (AIM), and the reduced density gradient (RDG) of hydrogen bonding properties and characteristics of the 19 geometries suggests that the hydrogen bonding in all the optimized structures of epinephrine-uracil complex is kind of a closed-shell interaction and mainly electrostatic dominant.
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Affiliation(s)
- Ling Pei
- Department of Chemical Engineering and Safety, Binzhou University, Binzhou, 256603, Shandong, People's Republic of China.
| | - Da-Zhi Li
- Department of Chemical Engineering and Safety, Binzhou University, Binzhou, 256603, Shandong, People's Republic of China
| | - Li-Juan Zhang
- Department of Chemical Engineering and Safety, Binzhou University, Binzhou, 256603, Shandong, People's Republic of China
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12
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Theoretical Study of the Adsorption Process of Antimalarial Drugs into Acrylamide-Base Hydrogel Model Using DFT Methods: The First Approach to the Rational Design of a Controlled Drug Delivery System. Processes (Basel) 2019. [DOI: 10.3390/pr7070396] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
The interaction between three widely used antimalarial drugs chloroquine, primaquine and amodiaquine with acrylamide dimer and trimer as a hydrogel model, were studied by means of density functional theory calculation in both vacuum and water environments, using the functional wb97xd with 6-31++G(d,p) basis set and polarizable continuum model (C-PCM) of solvent. According to binding energy, around −3.15 to −11.91 kJ/mol, the interaction between antimalarial compounds and hydrogel model are exothermic in nature. The extent of interaction found is primaquine > amodiaquine > chloroquine. The natural bond orbital (NBO) calculation and application of second-order perturbation theory show strong charge transfer between the antimalarial and hydrogel model. In addition, the results suggest these interactions are polar in nature, where hydrogen bonds play a principal role in stabilization of the complex. Comparing with the gas-phase, the complexes in the water environment are also stable, with suitable values of Log P (Partition coefficient), and dipolar momentum. Consequently, these results encourage to test acrylamide hydrogels as antimalarial delivery systems.
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Dash J, Ray S, Devi N, Basutkar N, Ambade AV, Pesala B. Fine-tuning of Terahertz resonances in hydrogen-bonded organic molecular complexes. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2019.02.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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14
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Zaini MF, Razak IA, Khairul WM, Arshad S. Crystal structure and optical spectroscopic analyses of ( E)-3-(1 H-indol-2-yl)-1-(4-nitro-phen-yl)prop-2-en-1-one hemihydrate. Acta Crystallogr E Crystallogr Commun 2018; 74:1589-1594. [PMID: 30443387 PMCID: PMC6218902 DOI: 10.1107/s2056989018014329] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Accepted: 10/11/2018] [Indexed: 11/17/2022]
Abstract
The asymmetric unit of the title compound, 2C17H12N2O3·H2O comprises two mol-ecules of (E)-3-(1H-indol-2-yl)-1-(4-nitro-phen-yl)prop-2-en-1-one and a water mol-ecule. The main mol-ecule adopts an s-cis configuration with respect to the C=O and C=C bonds. The dihedral angle between the indole ring system and the nitro-substituted benzene ring is 37.64 (16)°. In the crystal, mol-ecules are linked by O--H⋯O and N-H⋯O hydrogen bonds, forming chains along [010]. In addition, weak C-H⋯O, C-H⋯π and π-π inter-actions further link the structure into a three-dimensional network. The optimized structure was generated theoretically via a density functional theory (DFT) approach at the B3LYP/6-311 G++(d,p) basis level and the HOMO-LUMO behaviour was elucidated to determine the energy gap. The obtained values of 2.70 eV (experimental) and 2.80 eV (DFT) are desirable for optoelectronic applications. The inter-molecular inter-actions were qu-anti-fied and analysed using Hirshfeld surface analysis.
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Affiliation(s)
- Muhamad Fikri Zaini
- X-ray Crystallography Unit, School of Physics, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia
| | - Ibrahim Abdul Razak
- X-ray Crystallography Unit, School of Physics, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia
| | - Wan Mohd Khairul
- School of Fundamental Science, Universiti Malaysia Terengganu, 21030, Kuala Terengganu, Terengganu, Malaysia
| | - Suhana Arshad
- X-ray Crystallography Unit, School of Physics, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia
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15
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Vibhute AM, Deva Priyakumar U, Ravi A, Sureshan KM. Model molecules to classify CHO hydrogen-bonds. Chem Commun (Camb) 2018; 54:4629-4632. [PMID: 29671427 DOI: 10.1039/c8cc01653d] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
We developed a set of conformationally locked molecules each of which makes a single CHO H-bond/short contact and has different electron density at the acceptor oxygen atom. The downfield shift of the 1H NMR signals due to the hydrogen involved in the CHO H-bond varied from 0.93-1.6 ppm, and the magnitude of Δδ is in correlation with the hybridization state of the acceptor oxygen and with the CHO H-bond strengths quantified using a computational method.
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Affiliation(s)
- Amol M Vibhute
- School of Chemistry, Indian Institute of Science Education and Research (IISER), Thiruvananthapuram, Kerala-695551, India.
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16
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Giron RGP, Ferguson GS. Tetrafluoroborate and Hexafluorophosphate Ions are not Interchangeable: A Density Functional Theory Comparison of Hydrogen Bonding. ChemistrySelect 2017. [DOI: 10.1002/slct.201702176] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Rachel Guia P. Giron
- Department of Chemistry; Lehigh University; 6 E. Packer Ave. Bethlehem PA 18015 USA
| | - Gregory S. Ferguson
- Departments of Chemistry and Materials Science & Engineering; Lehigh University; 6 E. Packer Ave. Bethlehem PA 18015 USA
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17
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Viana MAA, Araújo RCMU, Neto JAM, Chame HC, Pereira AM, Oliveira BG. The interaction strengths and spectroscopy parameters of the C 2H 2∙∙∙HX and HCN∙∙∙HX complexes (X = F, Cl, CN, and CCH) and related ternary systems valued by fluxes of charge densities: QTAIM, CCFO, and NBO calculations. J Mol Model 2017; 23:110. [PMID: 28285444 DOI: 10.1007/s00894-017-3270-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2016] [Accepted: 01/31/2017] [Indexed: 11/30/2022]
Abstract
This theoretical work exhibits a new systematic study of structural parameters, electronic properties, infrared vibration modes, and molecular topography of hydrogen complexes, namely linear-type HCN⋯HX and T-type C2H2⋯HX (X = F, Cl, CN, and CCH). Ideally, the knowledge of the ternary systems of C2H2⋯HCN⋯HF and HCN⋯HCN⋯HF whose subparts integrate the linear and T-shaped complexes were used to give support in this current research. By means of computational calculations carried out in both levels B3LYP and MP2, the variations of the HX bond lengths are clearly overestimated in the HCN⋯HX linear complexes. In agreement with the analyses of the electrostatic potentials, the higher intermolecular energies of these complexes agree with the larger red-shifts in the stretch frequencies in HX. Also, the QTAIM descriptors and NBO calculations were used to inspect the interaction strength as well as to confirm the π cloud as a proton accepting center. By taking into account the absorption intensity ratio as a standard parameter to predict the interaction strength and intermolecular characterization, the formalism of the charge-charge flux-overlap modified (CCFO) was applied.
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Affiliation(s)
- Marco A A Viana
- Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Norte, 59215-000, Nova Cruz, RN, Brazil
| | - Regiane C M U Araújo
- Departamento de Química - Centro das Ciências Exatas e da Natureza, Universidade Federal da Paraíba, 58051-900, João Pessoa, PB, Brazil
| | - José A Maia Neto
- Departamento de Química - Centro das Ciências Exatas e da Natureza, Universidade Federal da Paraíba, 58051-900, João Pessoa, PB, Brazil
| | - Henrique C Chame
- Departamento de Química - Centro das Ciências Exatas e da Natureza, Universidade Federal da Paraíba, 58051-900, João Pessoa, PB, Brazil
| | - Arquimedes M Pereira
- Ciência e Tecnologia da Paraíba, Instituto Federal de Educação, Campus Guarabira, 58200-000, Guarabira, PB, Brazil
| | - Boaz G Oliveira
- Centro das Ciências Exatas e das Tecnologias, Universidade Federal do Oeste da Bahia, Campus Reitor Edgard Santos, 47805-000, Barreiras, BA, Brazil.
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