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Abdel-Rahman MA, Shiroudi A, Czub J, Zhao H. Screening Stability, Thermochemistry, and Chemical Kinetics of 3-Hydroxybutanoic Acid as a Bifunctional Biodiesel Additive. J Phys Chem A 2024; 128:4068-4082. [PMID: 38728207 PMCID: PMC11129312 DOI: 10.1021/acs.jpca.4c01338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Revised: 04/25/2024] [Accepted: 05/01/2024] [Indexed: 05/12/2024]
Abstract
The thermo-kinetic aspects of 3-hydroxybutyric acid (3-HBA) pyrolysis in the gas phase were investigated using density functional theory (DFT), specifically the M06-2X theoretical level in conjunction with the cc-pVTZ basis set. The obtained data were compared with benchmark CBS-QB3 results. The degradation mechanism was divided into 16 pathways, comprising 6 complex fissions and 10 barrierless reactions. Energy profiles were calculated and supplemented with computations of rate coefficients and branching ratios over the temperature range of 600-1700 K at a pressure of 1 bar using transition state theory (TST) and Rice-Ramsperger-Kassel-Marcus (RRKM) methods. Thermodynamics results indicated the presence of six stable conformers within a 4 kcal mol-1 energy range. The estimated chemical kinetics results suggested that TST and RRKM approaches are comparable, providing confidence in our calculations. The branching ratio analysis reveals that the dehydration reaction pathway leading to the formation of H2O and CH3CH═CHCO2H dominates entirely at T ≤ 650 K. At these temperatures, there is a minor contribution from the simple homolytic bond fission reaction, yielding related radicals [CH3•CHOH + •CH2CO2H]. However, at T ≥ 700 K, this reaction becomes the primary decomposition route. At T = 1700 K, there is a minor involvement of a reaction pathway resulting in the formation of CH3CH(OH)•CH2 + •CHO(OH) with an approximate contribution of 16%, and a reaction leading to [•CH3 + •CH2OHCH2CO2H] with around 9%.
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Affiliation(s)
| | - Abolfazl Shiroudi
- Department of Physical Chemistry, Gdańsk University of Technology, Narutowicza 11/12, Gdańsk 80-233, Poland
- BioTechMed
Center, Gdańsk University of Technology, Gdańsk 80-233, Poland
| | - Jacek Czub
- Department of Physical Chemistry, Gdańsk University of Technology, Narutowicza 11/12, Gdańsk 80-233, Poland
- BioTechMed
Center, Gdańsk University of Technology, Gdańsk 80-233, Poland
| | - Hao Zhao
- College
of Engineering, Peking University, Beijing 100871, China
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Halim SA, Abdel-Rahman MA. First-principles density functional theoretical study on the structures, reactivity and spectroscopic properties of (NH) and (OH) Tautomer's of 4-(methylsulfanyl)-3[(1Z)-1-(2-phenylhydrazinylidene) ethyl] quinoline-2(1H)-one. Sci Rep 2023; 13:8909. [PMID: 37264069 DOI: 10.1038/s41598-023-35933-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2022] [Accepted: 05/25/2023] [Indexed: 06/03/2023] Open
Abstract
The tautomerizations mechanism of 4-(methylsulfanyl)-3[(1Z)-1-(2-phenylhydrazinylidene) ethyl] quinoline-2(1H)-one were inspected in the gas phase and ethanol using density function theory (DFT) M06-2X and B3LYP methods. Thermo-kinetic features of different conversion processes were estimated in temperature range 273-333 K using the Transition state theory (TST) accompanied with one dimensional Eckert tunneling correction (1D-Eck). Acidity and basicity were computed as well, and the computational results were compared against the experimental ones. Additionally, NMR, global descriptors, Fukui functions, NBO charges, and electrostatic potential (ESP) were discussed. From thermodynamics analysis, the keto form of 4-(methylsulfanyl)-3-[(1Z)-1-(2 phenylhydrazinylidene) quinoline-2(1H)-one is the most stable form in the gas phase and ethanol and the barrier heights required for tautomerization process were found to be high in the gas phase and ethanol ~ 38.80 and 37.35 kcal/mol, respectively. DFT methods were used for UV-Vis electronic spectra simulation and the time-dependent density functional theory solvation model (TDDFT-SMD) in acetonitrile compounds.
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Affiliation(s)
- Shimaa Abdel Halim
- Chemistry Department, Faculty of Education, Ain Shams University, Roxy, Cairo, 11711, Egypt.
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Abdel-Rahman MA, Shiroudi A, Kaya S, El-Nahas AM. Theoretical investigations on the unimolecular decomposition mechanisms of isopropyl acetate. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.133006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Ferro-Costas D, Cordeiro MNDS, Fernández-Ramos A. An integrated protocol to study hydrogen abstraction reactions by atomic hydrogen in flexible molecules: application to butanol isomers. Phys Chem Chem Phys 2022; 24:3043-3058. [DOI: 10.1039/d1cp03928h] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
This work presents a protocol designed to study hydrogen abstraction reactions by atomic hydrogen in molecules with multiple conformations.
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Affiliation(s)
- David Ferro-Costas
- Center for Research in Biological Chemistry and Molecular Materials (CIQUS), University of Santiago de Compostela, 15782, Santiago de Compostela, Spain
| | - M. Natália D. S. Cordeiro
- LAQV@REQUIMTE, Department of Chemistry & Biochemistry, Faculty of Sciences, University of Porto, Rua do Campo Alegre, 4169-007, Porto, Portugal
| | - Antonio Fernández-Ramos
- Center for Research in Biological Chemistry and Molecular Materials (CIQUS), University of Santiago de Compostela, 15782, Santiago de Compostela, Spain
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5
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Mahmoud MA, El-Nahas AM. Biodiesel combustion: Kinetics and thermochemistry of H-atom abstraction from methyl propionate by Ö (3P) and O2H radicals: ab initio study. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.130896] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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First-principle kinetic studies of unimolecular pyrolysis of isopropyl esters as biodiesel surrogates. Theor Chem Acc 2021. [DOI: 10.1007/s00214-021-02800-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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7
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Rahbar A, Zahedi E, Aghaie H, Giahi M, Zare K. DFT Insight into the Kinetics and Mechanism of the OH
.
‐Initiated Atmospheric Oxidation of Catechol: OH
.
Addition and Hydrogen Abstraction Pathways. ChemistrySelect 2021. [DOI: 10.1002/slct.202100524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ali Rahbar
- Department of Chemistry, Science and Research Branch Islamic Azad University Tehran Iran
| | - Ehsan Zahedi
- Department of Chemistry, Herbal Medicines Raw Materials Research Center, Shahrood Branch Islamic Azad University, Shahrood Iran
| | - Hossein Aghaie
- Department of Chemistry, Science and Research Branch Islamic Azad University Tehran Iran
| | - Masoud Giahi
- Department of Chemistry, South-Tehran Branch Islamic Azad University Tehran Iran
| | - Karim Zare
- Department of Chemistry, Science and Research Branch Islamic Azad University Tehran Iran
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8
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Al-Otaibi JS, Mahmoud MAM, Almuqrin AH, El-Gogary TM, Abdel-Rahman MA, El-Nahas AM. Ab initio-based kinetics of hydrogen atom abstraction from methyl propionate by H and CH3 radicals: a biodiesel model. Struct Chem 2021. [DOI: 10.1007/s11224-021-01746-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Khojandi M, Zahedi E, Seif A, Taghvamanesh A, Karimkhani M. A Theoretical Study on the Degenerate Cope Rearrangement of Hypostrophene Using the RRKM Theory and Topological Approaches. ChemistrySelect 2021. [DOI: 10.1002/slct.202004495] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Mahya Khojandi
- Department of Chemistry Central Tehran Branch Islamic Azad University Tehran Iran
| | - Ehsan Zahedi
- Department of Chemistry Shahrood Branch Islamic Azad University Shahrood Iran
| | - Ahmad Seif
- Department of Chemistry Central Tehran Branch Islamic Azad University Tehran Iran
| | - Afshin Taghvamanesh
- Department of Chemistry Central Tehran Branch Islamic Azad University Tehran Iran
| | - Mehrnoosh Karimkhani
- Department of Chemistry Central Tehran Branch Islamic Azad University Tehran Iran
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Mahmoud MA, Shiroudi A, Abdel-Rahman MA, Shibl MF, Abdel-Azeim S, El-Nahas AM. Structures, energetics, and kinetics of H-atom abstraction from methyl propionate by molecular oxygen: Ab initio and DFT investigations. COMPUT THEOR CHEM 2021. [DOI: 10.1016/j.comptc.2020.113119] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Shiroudi A, Abdel-Rahman MA, El-Nahas AM, Altarawneh M. Atmospheric chemistry of oxazole: the mechanism and kinetic studies of the oxidation reaction initiated by OH radicals. NEW J CHEM 2021. [DOI: 10.1039/d0nj05797e] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Oxidation of oxazole by OH˙ radicals studied by DFT methods coupled with reaction kinetics calculations using TST and RRKM theories.
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Affiliation(s)
- Abolfazl Shiroudi
- Young Researchers and Elite Club
- East Tehran Branch
- Islamic Azad University
- Tehran
- Iran
| | | | - Ahmed M. El-Nahas
- Chemistry Department
- Faculty of Science
- Menoufia University
- Shebin El-Kom 32512
- Egypt
| | - Mohammednoor Altarawneh
- Chemical and Petroleum Engineering Department
- United Arab Emirates University (UAEU)
- Al-Ain 15551
- United Arab Emirates
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Abdel-Rahman MA, Shibl MF, El-Demerdash SH, El-Nahas AM. Simulated kinetics of the atmospheric removal of aniline during daytime. CHEMOSPHERE 2020; 255:127031. [PMID: 32417518 DOI: 10.1016/j.chemosphere.2020.127031] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Revised: 05/06/2020] [Accepted: 05/08/2020] [Indexed: 06/11/2023]
Abstract
Oxidations of aniline (AN) initiated by OH-radicals are simulated in the temperature range 200-400 K using DFT/M06-2X/6-311++G(2df,2p) and ab initio ROCBS-QB3 levels. Chemical kinetics of such reactions were investigated based on several approaches including classical transition state theory (TST), conical variational transition state theory (CVT), and Rice-Ramsperger-Kassel-Marcus master equation (RRKM-ME) theories. Under atmospheric conditions, the reaction of OH radical with AN and the subsequent reactions with O2 molecules are investigated. The results indicate that the majority of O2 addition goes to the anti-directions with a branching ratio of 97.7% and produces the bicyclic peroxy radicals (BPRs) that can react with NO radical to form bicyclic alkoxy radicals (BARs). The latter compounds can be stabilized either by cyclization or via ring cleavage.
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Affiliation(s)
- Mohamed A Abdel-Rahman
- Chemistry Department, Faculty of Science, Menoufia University, Shebin El-Kom, 32512, Egypt
| | - Mohamed F Shibl
- Department of Chemistry and Earth Sciences, College of Arts and Sciences, Qatar University, P.O. Box 2713, Doha, Qatar.
| | - Safinaz H El-Demerdash
- Chemistry Department, Faculty of Science, Menoufia University, Shebin El-Kom, 32512, Egypt
| | - Ahmed M El-Nahas
- Chemistry Department, Faculty of Science, Menoufia University, Shebin El-Kom, 32512, Egypt.
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13
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Ali MA. Computational studies on the gas phase reaction of methylenimine (CH 2NH) with water molecules. Sci Rep 2020; 10:10995. [PMID: 32620911 PMCID: PMC7335075 DOI: 10.1038/s41598-020-67515-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Accepted: 05/31/2020] [Indexed: 11/16/2022] Open
Abstract
In this work, we used quantum chemical methods and chemical kinetic models to answer the question of whether or not formaldehyde (CH2O) and ammonia (NH3) can be produced from gas phase hydration of methylenimine (CH2NH). The potential energy surfaces (PESs) of CH2NH + H2O → CH2O + NH3 and CH2NH + 2H2O → CH2O + NH3 + H2O reactions were computed using CCSD(T)/6-311++G(3d,3pd)//M06-2X/6-311++G(3d,3pd) level. The temperature-and pressure-dependent rate constants were calculated using variational transition state theory (VTST), microcanonical variational transition state theory [Formula: see text] and Rice-Ramsperger-Kassel-Marcus/master equation (RRKM/ME) simulations. The PES along the reaction path forming a weakly bound complex (CH2NH⋯H2O) was located using VTST and [Formula: see text]VTST, however, the PES along the tight transition state was characterized by VTST with small curvature tunneling (SCT) approach. The results show that the formation of CH2NH + H2O → CH2NH⋯H2O is pressure -and temperature-dependent. The calculated atmospheric lifetimes of CH2NH⋯H2O (~ 8 min) are too short to undergo secondary bimolecular reactions with other atmospheric species. Our results suggest that the formation of CH2O and NH3 likely to occur in the combustion of biomass burning but the rate of formation CH2O and NH3 is predicted to be negligible under atmospheric conditions. When a second water molecule is added to the reaction, the results suggest that the rates of formation of CH2O and NH3 remain negligible.
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Affiliation(s)
- Mohamad Akbar Ali
- Department of Chemistry, College of Science, King Faisal University, 31982, Al-Ahsa, Saudi Arabia.
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