1
|
Lobayan RM, Bochicchio RC, Marturet AD. Topological description of complex patterns of bonding, charge transference and structural changes in chemical reactions: SN2 type reactions, a case study. J Mol Graph Model 2022; 112:108121. [DOI: 10.1016/j.jmgm.2021.108121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Revised: 12/21/2021] [Accepted: 12/31/2021] [Indexed: 11/29/2022]
|
2
|
El-Meligy A, El-Demerdash SH, Abdel-Rahman MA, Mahmoud MAM, Taketsugu T, El-Nahas AM. Structures, Energetics, and Spectra of (NH) and (OH) Tautomers of 2-(2-Hydroxyphenyl)-1-azaazulene: A Density Functional Theory/Time-Dependent Density Functional Theory Study. ACS OMEGA 2022; 7:14222-14238. [PMID: 35559155 PMCID: PMC9089341 DOI: 10.1021/acsomega.2c00866] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/12/2022] [Accepted: 04/05/2022] [Indexed: 06/15/2023]
Abstract
Tautomerization of 2-(2-hydroxyphenyl)-1-azaazulene (2OHPhAZ) in the gas phase and ethanol has been studied using B3LYP, M06-2X, and ωB97XD density functional theory (DFT) with different basis sets. For more accurate data, energies were refined at CCSD(T)/6-311++G(2d,2p) in the gas phase. Nuclear magnetic resonance (NMR), aromaticity, Fukui functions, acidity, and basicity were also calculated and compared with experimental data. Time-dependent density functional theory (TDDFT)-solvation model based on density (TDDFT-SMD) calculations in acetonitrile have been utilized for the simulation of UV-vis electronic spectra. In addition, electronic structures of the investigated system have been discussed. The results reveal that the enol form (2OHPhAZ) is thermodynamically and kinetically stable relative to the keto tautomer (2OPhAZ) and different rotamers (2OHPhAZ-R1:R3) in the gas phase and ethanol. A comparison with the experiment illustrates a good agreement and supports the computational findings.
Collapse
Affiliation(s)
- Asmaa
B. El-Meligy
- Chemistry
Department, Faculty of Science, Menoufia
University, Shebin
El-Kom 32512, Egypt
| | | | | | - Mohamed A. M. Mahmoud
- Basic
Sciences Department, Tanta Higher Institute
of Engineering and Technology, Tanta 31511, Egypt
| | - Tetsuya Taketsugu
- Department
of Chemistry, Faculty of Science, Hokkaido
University, Sapporo 060-0810, Japan
- Institute
for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido
University, Sapporo 060-0810, Japan
| | - Ahmed M. El-Nahas
- Chemistry
Department, Faculty of Science, Menoufia
University, Shebin
El-Kom 32512, Egypt
| |
Collapse
|
3
|
Rammah M, Mahdhaoui F, Ayachi S, Boubaker T. Exploring the reactivity of benzotriazole derivatives: Mayr's approach and density functional theory analysis. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2021.131310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
4
|
Padmanabhan J, Arif Z, Singh P, Parthasarathi R. Chemical Reactivity and Skin Sensitization Studies on a Series of Chloro- and Fluoropyrroles-A Computational Approach. ACS OMEGA 2021; 6:21514-21524. [PMID: 34471754 PMCID: PMC8388083 DOI: 10.1021/acsomega.1c02436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/08/2021] [Accepted: 07/28/2021] [Indexed: 06/13/2023]
Abstract
Global density functional descriptors analysis on a series of chloro- and fluoropyrroles provide vital data concerning their overall biochemical activities. In this study, a comprehensive investigation is presented for a series of chloro- and fluoropyrroles using DFT-based descriptors to elucidate physicochemical properties and their relevance to reactivity, charge transfer, site selectivity, and toxicity. Electrophilicity-based charge transfer (ECT) descriptor reveals the fact that chloro- and fluoropyrroles act as electron donors during their interaction with DNA bases. The local descriptor, namely, multiphilic descriptor conveys the activeness of specific sites in chloro- and fluoropyrroles. Further, Toxicity Prediction Komputer Assisted Technology (TOPKAT) studies on carcinogenicity bioassays using four rodent models provide the interesting fact that chloro- and fluoropyrroles exhibit a strong skin sensitization effect in these species.
Collapse
Affiliation(s)
- Jaganathan Padmanabhan
- Department
of Physics, Government Arts College for
Men (Autonomous), Nandanam, Chennai 600035, Tamilnadu, India
| | - Zeeshan Arif
- Computational
Toxicology Facility, CSIR-Indian Institute
of Toxicology Research, 31, Mahatma Gandhi Marg, Lucknow 226001, Uttar Pradesh, India
| | - Prakrity Singh
- Computational
Toxicology Facility, CSIR-Indian Institute
of Toxicology Research, 31, Mahatma Gandhi Marg, Lucknow 226001, Uttar Pradesh, India
| | - Ramakrishnan Parthasarathi
- Computational
Toxicology Facility, CSIR-Indian Institute
of Toxicology Research, 31, Mahatma Gandhi Marg, Lucknow 226001, Uttar Pradesh, India
| |
Collapse
|
5
|
Sharma BK, Roy DR. Toxicity of polyhalogenated dibenzo-p-furans in the light of nucleic acid bases interaction. Comput Biol Chem 2018; 76:225-231. [PMID: 30075463 DOI: 10.1016/j.compbiolchem.2018.07.004] [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: 05/14/2018] [Revised: 06/24/2018] [Accepted: 07/03/2018] [Indexed: 10/28/2022]
Abstract
Quantitative structure-activity relationship (QSAR) investigation utilizing quantum chemical descriptors under density functional theory is performed to predict the toxicity (pEC50) of a series of polyhalogenated dibenzo-p-furans (PHDFs). PHDFs are very important concern to the researchers due to their presence and diverse effects in the environment. A successful two parameter QSAR model is developed with a combination of a global descriptor known as charge transfer (ΔN) between toxins and biosystem and a local descriptor as Fukui function (fmax+) for maximum nucleophilic attack at the toxin site. A systematic analysis is performed to identify the electron donation/acceptance nature of the considered PHDF compounds with the choice of a model biosystems comprising five different nucleic acid bases, namely Adenine, Thymine, Guanine, Cytosine and Uracil to identify proper ΔN descriptor. Accordingly, PHDFs are found to be electron acceptors with maximum charge transfer from Guanine and therefore, ΔNG is utilized as the charge transfer parameter for all the toxins in the present work. The selected combination of global and local descriptors (ΔNG andfmax+) are found to predict 93% of the observed toxicity (pEC50) of the PHDFs. The developed QSAR model is tested for two different test sets: PHDFs and polyhalogenated biphenyls (PHBs) with about 90% of prediction of their toxicity values, which confirms the importance of the selected descriptors.
Collapse
Affiliation(s)
- Bhumika K Sharma
- Materials and Biophysics Group, Department of Applied Physics, S. V. National Institute of Technology, Surat, 395007, India
| | - Debesh R Roy
- Materials and Biophysics Group, Department of Applied Physics, S. V. National Institute of Technology, Surat, 395007, India.
| |
Collapse
|
6
|
Hatua K, Mondal A, Nandi PK. Static second hyperpolarizability of inverse sandwich compounds (M 1-C 5H 5-M 2) of alkali (M 1 = Li, Na, K) and alkaline earth metals (M 2 = Be, Mg, Ca). Phys Chem Chem Phys 2018; 20:13331-13339. [PMID: 29717731 DOI: 10.1039/c8cp01210e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
In the investigated inverse sandwich complexes, charge transfer from alkali metal (M1) led to aromatically stabilized Cp ring, which prevented further charge transfer from the alkaline earth metal (M2). This electron push effect resulted in diffusion of electron density from the outermost "ns" subshell of alkaline earth metal. The alkaline earth metal is weakly bound to the alkali metal-C5H5 complex. The vertical ionization energy of the chosen M1-Cp-M2 complexes was smaller than that of the corresponding alkaline earth metals. Large second hyperpolarizability (106-108 a.u.) was obtained for the studied molecules. The correction due to the basis set superposition error (BSSE) in the calculated second hyperpolarizability was found to be small for larger systems, while it was rather significant for small systems. The MP4SDQ and CCSD results were in fair agreement, which indicates the necessity of higher order electron correlation treatment in the accurate description of second hyperpolarizability. Calculated dynamic second hyperpolarizabilities at 1064 nm were found to increase considerably for most of the chosen metal complexes.
Collapse
Affiliation(s)
- Kaushik Hatua
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Howrah-711103, India.
| | - Avijit Mondal
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Howrah-711103, India.
| | - Prasanta K Nandi
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Howrah-711103, India.
| |
Collapse
|
7
|
Structure, stability, and electronic properties of AlP nanocages evolved from the world's smallest caged fullerene C 20 : A computational study at DFT. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.01.022] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
8
|
Păuşescu I, Medeleanu M, Ştefănescu M, Peter F, Pop R. A DFT Study on the Stability and Aromaticity of Heterobenzenes Containing Group 15 Elements. HETEROATOM CHEMISTRY 2014. [DOI: 10.1002/hc.21250] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Iulia Păuşescu
- Faculty of Industrial Chemistry and Environmental Engineering; University Politehnica of Timişoara; 300006 Timişoara România
- Institute for Chemistry Timişoara of the Romanian Academy; 300223 Timişoara România
| | - Mihai Medeleanu
- Faculty of Industrial Chemistry and Environmental Engineering; University Politehnica of Timişoara; 300006 Timişoara România
| | - Mircea Ştefănescu
- Faculty of Industrial Chemistry and Environmental Engineering; University Politehnica of Timişoara; 300006 Timişoara România
| | - Francisc Peter
- Faculty of Industrial Chemistry and Environmental Engineering; University Politehnica of Timişoara; 300006 Timişoara România
| | - Raluca Pop
- Faculty of Pharmacy; University of Medicine and Pharmacy “Victor Babeş” Timişoara; 300041 Timişoara România
| |
Collapse
|
9
|
Szefler B, Diudea MV. Quantum-mechanical calculations on molecular substructures involved in nanosystems. Molecules 2014; 19:15468-506. [PMID: 25264833 PMCID: PMC6270685 DOI: 10.3390/molecules191015468] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2014] [Revised: 08/21/2014] [Accepted: 09/10/2014] [Indexed: 11/16/2022] Open
Abstract
In this review article, four ideas are discussed: (a) aromaticity of fullerenes patched with flowers of 6-and 8-membered rings, optimized at the HF and DFT levels of theory, in terms of HOMA and NICS criteria; (b) polybenzene networks, from construction to energetic and vibrational spectra computations; (c) quantum-mechanical calculations on the repeat units of various P-type crystal networks and (d) construction and stability evaluation, at DFTB level of theory, of some exotic allotropes of diamond D5, involved in hyper-graphenes. The overall conclusion was that several of the yet hypothetical molecular nanostructures herein described are serious candidates to the status of real molecules.
Collapse
Affiliation(s)
- Beata Szefler
- Department of Physical Chemistry, Collegium Medicum, Nicolaus Copernicus University, Kurpińskiego 5, Bydgoszcz 85-096, Poland
| | - Mircea V Diudea
- Faculty of Chemistry and Chemical Engineering, Babes-Bolyai University, Arany Janos street 11, Cluj-Napoca RO-400028, Romania.
| |
Collapse
|
10
|
Abstract
AbstractThe aromatic character of three different flowers of general formula [n:(p i,p j)n/2], namely [8:(5,7)4], [8:(6,6)4] and [8:(5,6)4], has been evaluated by means of geometric (HOMA index), energetic (heats of formation) and magnetic criteria (NICS index, exaltation of magnetic susceptibility). Also, the reactivity descriptors within the DFT approach -absolute hardness, electrophilicity, Fukui functions — have been computed. All the different methods used for estimating the aromaticity led to a unitary conclusion. Two fullerene structures, patched by the most stable 8-Sumanene flower, have been designed and evaluated by means of ab initio computations
Collapse
|
11
|
Feixas F, Matito E, Poater J, Solà M. Metalloaromaticity. WILEY INTERDISCIPLINARY REVIEWS-COMPUTATIONAL MOLECULAR SCIENCE 2012. [DOI: 10.1002/wcms.1115] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
|
12
|
Foroutan-Nejad C. Al4(2-); the anion-π interactions and aromaticity in the presence of counter ions. Phys Chem Chem Phys 2012; 14:9738-48. [PMID: 22684037 DOI: 10.1039/c2cp40511c] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The influence of presence of counter ions and π-complexation with benzene on the bonding and magnetic properties of Al(4)(2-), the most studied all-metal cluster, is studied here. It is shown that complexation by either counter ions or benzene decreases the delocalization index between Al atoms and the magnitude of bond magnetizability, that is a Quantum Theory of Atoms in Molecules, QTAIM, -based magnetic index of aromaticity. Benzene forms two types of π-complexes with the Al(4) framework; CH-π (T-shaped) complexes and parallel π-π stacking (PPS) complexes. It is shown that variation in the π-charge of the Al(4) framework affects the relative stability of the T-shaped/PPS complexes. Free Al(4)(2-) forms a stable T-shaped anion-π complex with benzene but in the presence of cations, formation of PPS complexes is more favourable, energetically. It is suggested that this property could be used for designing molecular switches and tuneable anion sensors.
Collapse
Affiliation(s)
- Cina Foroutan-Nejad
- School of Chemistry, College of Science, University of Tehran, Tehran, Iran.
| |
Collapse
|
13
|
Aromaticity and electronic delocalization in all-metal clusters with single, double, and triple aromatic character. Theor Chem Acc 2010. [DOI: 10.1007/s00214-010-0805-8] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
14
|
A Critical Assessment of the Performance of Magnetic and Electronic Indices of Aromaticity. Symmetry (Basel) 2010. [DOI: 10.3390/sym2021156] [Citation(s) in RCA: 94] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
|
15
|
Feixas F, Jiménez-Halla JOC, Matito E, Poater J, Solà M. A Test to Evaluate the Performance of Aromaticity Descriptors in All-Metal and Semimetal Clusters. An Appraisal of Electronic and Magnetic Indicators of Aromaticity. J Chem Theory Comput 2010. [DOI: 10.1021/ct100034p] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Ferran Feixas
- Institut de Química Computacional and Departament de Química, Universitat de Girona, Campus de Montilivi, 17071 Girona, Catalonia, Spain and Institute of Physics, University of Szczecin, 70-451 Szczecin, Poland
| | - J. Oscar C. Jiménez-Halla
- Institut de Química Computacional and Departament de Química, Universitat de Girona, Campus de Montilivi, 17071 Girona, Catalonia, Spain and Institute of Physics, University of Szczecin, 70-451 Szczecin, Poland
| | - Eduard Matito
- Institut de Química Computacional and Departament de Química, Universitat de Girona, Campus de Montilivi, 17071 Girona, Catalonia, Spain and Institute of Physics, University of Szczecin, 70-451 Szczecin, Poland
| | - Jordi Poater
- Institut de Química Computacional and Departament de Química, Universitat de Girona, Campus de Montilivi, 17071 Girona, Catalonia, Spain and Institute of Physics, University of Szczecin, 70-451 Szczecin, Poland
| | - Miquel Solà
- Institut de Química Computacional and Departament de Química, Universitat de Girona, Campus de Montilivi, 17071 Girona, Catalonia, Spain and Institute of Physics, University of Szczecin, 70-451 Szczecin, Poland
| |
Collapse
|
16
|
JimÉnez-halla JOC, Matito E, Blancafort L, Robles J, Solà M. Tuning aromaticity in trigonal alkaline earth metal clusters and their alkali metal salts. J Comput Chem 2009; 30:2764-76. [DOI: 10.1002/jcc.21291] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
|
17
|
Chamorro E, Duque-Noreña M, Pérez P. A comparison between theoretical and experimental models of electrophilicity and nucleophilicity. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/j.theochem.2008.11.009] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
18
|
Zubarev DY, Boldyrev AI. Revealing Intuitively Assessable Chemical Bonding Patterns in Organic Aromatic Molecules via Adaptive Natural Density Partitioning. J Org Chem 2008; 73:9251-8. [DOI: 10.1021/jo801407e] [Citation(s) in RCA: 213] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Dmitry Yu. Zubarev
- Department of Chemistry and Biochemistry, Utah State University, 0300 Old Main Hill, Logan, Utah 84322
| | - Alexander I. Boldyrev
- Department of Chemistry and Biochemistry, Utah State University, 0300 Old Main Hill, Logan, Utah 84322
| |
Collapse
|
19
|
Sun H, Yun X, Wu S, Teng Q. Theoretical studies on stabilities, 13C and 3He NMR spectroscopy of C84O derived from C84 (D2d). ACTA ACUST UNITED AC 2008. [DOI: 10.1016/j.theochem.2008.08.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
20
|
Khatua S, Roy DR, Bultinck P, Bhattacharjee M, Chattaraj PK. Aromaticity in cyclic alkali clusters. Phys Chem Chem Phys 2008; 10:2461-74. [DOI: 10.1039/b718176k] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|