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Pham TL, Ha Nguyen TT, Nguyen TA, Le-Deygen I, Hanh Le TM, Vu XM, Le HK, Van CB, Usacheva TR, Mai TT, Tran DL. Antioxidant activity of an inclusion complex between rutin and β-cyclodextrin: experimental and quantum chemical studies. RSC Adv 2024; 14:18330-18342. [PMID: 38854829 PMCID: PMC11157499 DOI: 10.1039/d4ra02307b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2024] [Accepted: 06/03/2024] [Indexed: 06/11/2024] Open
Abstract
This study aims to synthesize a guest-host complex derived from rutin (Rut) and β-cyclodextrin (β-CD) (denoted as [Rut⊂β-CD]). The obtained substance was characterized by the FT-IR and DSC methods, signifying the formation of an inclusion complex between Rut and β-CD. Complex formation increased the antioxidant activity of rutin corresponding to the decrease of EC50 values from 1.547 × 10-5 mol L-1 to 1.227 × 10-5 mol L-1 according to the DPPH free radical scavenging test. The rutin-β-CD interaction energies were calculated in the vacuum and various solvents (e.g., water, ethanol, and dimethylsulfoxide) utilizing an accurate and broadly parametrized self-consistent tight-binding quantum chemical method (GFN2-xTB). The calculation results reveal the influence of solvent on the structural formation of the rutin-β-CD complex. In both the vacuum and aqueous solution, rutin can enter into the small-sized empty cavity of β-CD, albeit through different terminals, resulting in distinct preferential structures. The presence of organic solvents appears to reduce the interaction between rutin and β-CD, with the interaction strength following the order: water > ethanol > dimethyl sulfoxide.
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Affiliation(s)
- Thi Lan Pham
- Institute for Tropical Technology, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet, Cau Giay Hanoi Vietnam
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet, Cau Giay Hanoi Vietnam
| | - Thi Thu Ha Nguyen
- Hanoi National University of Education 136 Xuan Thuy, Cau Giay Vietnam
| | - Tuan Anh Nguyen
- Institute for Tropical Technology, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet, Cau Giay Hanoi Vietnam
| | - Irina Le-Deygen
- Chimical enzymology department, Lomonosov Moscow State University Leninskie gory 11b Moscow Russian Federation
| | - Thi My Hanh Le
- Institute for Tropical Technology, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet, Cau Giay Hanoi Vietnam
| | - Xuan Minh Vu
- Institute for Tropical Technology, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet, Cau Giay Hanoi Vietnam
| | - Hai Khoa Le
- Institute for Tropical Technology, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet, Cau Giay Hanoi Vietnam
| | - Cuong Bui Van
- Institute for Tropical Technology, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet, Cau Giay Hanoi Vietnam
| | - T R Usacheva
- Ivanovo State University of Chemistry and Technology Sheremetevsky Avenue 7 153000 Ivanovo Russian Federation
| | - Thanh Tung Mai
- Hanoi University of Science and Technology 1 Dai Co Viet, Bach Khoa, Hai Ba Trung Hanoi Vietnam
| | - Dai Lam Tran
- Institute for Tropical Technology, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet, Cau Giay Hanoi Vietnam
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2
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Li L, Wei HL, Wang WL, Zhang PH, Jing F, Zhou YH, Yang XH. Unlocking the potential of phenolated kraft lignin as a versatile feed additive. Int J Biol Macromol 2024; 271:132234. [PMID: 38763239 DOI: 10.1016/j.ijbiomac.2024.132234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2024] [Revised: 04/23/2024] [Accepted: 04/30/2024] [Indexed: 05/21/2024]
Abstract
Lignin, a renewable natural antioxidant and bacteriostat, holds promise as a versatile, cost-effective feed additive. However, traditional industrial lignin faces limitations, including low reactivity, poor uniformity, and unstable properties, necessitating chemical modification. Complex modification methods pose economic and toxicity challenges, so this study adopted a relatively simple alkali-catalyzed phenolization approach, using phenol, catechol, and pyrogallol to modify kraft lignin, and characterized the resulting products using various techniques. Subsequently, their antioxidant, antibacterial, adsorption properties for heavy metal ions and mycotoxins, growth-promoting properties, and antiviral abilities were assessed. The phenolation process led to lignin depolymerization and a notable increase in phenolic hydroxyl content, particularly in pyrogallol-phenolated lignin (Py-L), rising from 3.08 to 4.68 mmol/g. These modified lignins exhibited enhanced antioxidant activity, with over 99 % inhibition against E. coli and S. aureus, and remarkable adsorption capacities for heavy metal ions and mycotoxins. Importantly, Py-L improved the growth performance of mice and reduced influenza mortality. Furthermore, density functional theory calculations elucidated the mechanism behind the enhanced antioxidant properties. This study presents a promising avenue for developing versatile feed additives to address challenges related to animal feed antioxidant supplementation, bacterial control, and growth promotion.
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Affiliation(s)
- Long Li
- Institute of Chemical Industry of Forest Products, CAF, Nanjing 210042, PR China; Key Lab. of Biomass Energy and Material, Jiangsu Province, Nanjing 210042, PR China; Key Lab. of Chemical Engineering of Forest Products, National Forestry and Grassland Administration, Nanjing 210042, PR China; National Engineering Research Center of Low-Carbon Processing and Utilization of Forest Biomass, Nanjing 210042, PR China; Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, PR China
| | - Hai-Lin Wei
- Medical College, Yangzhou University, Yangzhou 225009, PR China
| | - Wen-Lei Wang
- Medical College, Yangzhou University, Yangzhou 225009, PR China
| | - Ping-Hu Zhang
- Medical College, Yangzhou University, Yangzhou 225009, PR China
| | - Fei Jing
- Institute of Chemical Industry of Forest Products, CAF, Nanjing 210042, PR China; Key Lab. of Biomass Energy and Material, Jiangsu Province, Nanjing 210042, PR China; Key Lab. of Chemical Engineering of Forest Products, National Forestry and Grassland Administration, Nanjing 210042, PR China; National Engineering Research Center of Low-Carbon Processing and Utilization of Forest Biomass, Nanjing 210042, PR China
| | - Yong-Hong Zhou
- Institute of Chemical Industry of Forest Products, CAF, Nanjing 210042, PR China; Key Lab. of Biomass Energy and Material, Jiangsu Province, Nanjing 210042, PR China; Key Lab. of Chemical Engineering of Forest Products, National Forestry and Grassland Administration, Nanjing 210042, PR China; National Engineering Research Center of Low-Carbon Processing and Utilization of Forest Biomass, Nanjing 210042, PR China; Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, PR China
| | - Xiao-Hui Yang
- Institute of Chemical Industry of Forest Products, CAF, Nanjing 210042, PR China; Key Lab. of Biomass Energy and Material, Jiangsu Province, Nanjing 210042, PR China; Key Lab. of Chemical Engineering of Forest Products, National Forestry and Grassland Administration, Nanjing 210042, PR China; National Engineering Research Center of Low-Carbon Processing and Utilization of Forest Biomass, Nanjing 210042, PR China; Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, PR China.
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3
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Raczyńska ED, Gal JF, Maria PC. Strong Bases and beyond: The Prominent Contribution of Neutral Push-Pull Organic Molecules towards Superbases in the Gas Phase. Int J Mol Sci 2024; 25:5591. [PMID: 38891779 PMCID: PMC11172071 DOI: 10.3390/ijms25115591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2024] [Revised: 05/14/2024] [Accepted: 05/16/2024] [Indexed: 06/21/2024] Open
Abstract
In this review, the principles of gas-phase proton basicity measurements and theoretical calculations are recalled as a reminder of how the basicity PA/GB scale, based on Brønsted-Lowry theory, was constructed in the gas-phase (PA-proton affinity and/or GB-gas-phase basicity in the enthalpy and Gibbs energy scale, respectively). The origins of exceptionally strong gas-phase basicity of some organic nitrogen bases containing N-sp3 (amines), N-sp2 (imines, amidines, guanidines, polyguanides, phosphazenes), and N-sp (nitriles) are rationalized. In particular, the role of push-pull nitrogen bases in the development of the gas-phase basicity in the superbasicity region is emphasized. Some reasons for the difficulties in measurements for poly-functional nitrogen bases are highlighted. Various structural phenomena being in relation with gas-phase acid-base equilibria that should be considered in quantum-chemical calculations of PA/GB parameters are discussed. The preparation methods for strong organic push-pull bases containing a N-sp2 site of protonation are briefly reviewed. Finally, recent trends in research on neutral organic superbases, leaning toward catalytic and other remarkable applications, are underlined.
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Affiliation(s)
- Ewa Daniela Raczyńska
- Department of Chemistry, Warsaw University of Life Sciences (SGGW), ul. Nowoursynowska 159c, 02-776 Warsaw, Poland
| | - Jean-François Gal
- Institut de Chimie de Nice, UMR 7272, Université Côte d’Azur, Parc Valrose, 06108 Nice, France;
| | - Pierre-Charles Maria
- Institut de Chimie de Nice, UMR 7272, Université Côte d’Azur, Parc Valrose, 06108 Nice, France;
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4
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Campbell S, La C, Zhou Q, Le J, Galvez-Reyes J, Banach C, Houk KN, Chen JR, Paulson SE. Characterizing Hydroxyl Radical Formation from the Light-Driven Fe(II)-Peracetic Acid Reaction, a Key Process for Aerosol-Cloud Chemistry. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:7505-7515. [PMID: 38619820 PMCID: PMC11064221 DOI: 10.1021/acs.est.3c10684] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Revised: 03/26/2024] [Accepted: 03/27/2024] [Indexed: 04/16/2024]
Abstract
The reaction of peracetic acid (PAA) and Fe(II) has recently gained attention due to its utility in wastewater treatment and its role in cloud chemistry. Aerosol-cloud interactions, partly mediated by aqueous hydroxyl radical (OH) chemistry, represent one of the largest uncertainties in the climate system. Ambiguities remain regarding the sources of OH in the cloud droplets. Our research group recently proposed that the dark and light-driven reaction of Fe(II) with peracids may be a key contributor to OH formation, producing a large burst of OH when aerosol particles take up water as they grow to become cloud droplets, in which reactants are consumed within 2 min. In this work, we quantify the OH production from the reaction of Fe(II) and PAA across a range of physical and chemical conditions. We show a strong dependence of OH formation on ultraviolet (UV) wavelength, with maximum OH formation at λ = 304 ± 5 nm, and demonstrate that the OH burst phenomenon is unique to Fe(II) and peracids. Using kinetics modeling and density functional theory calculations, we suggest the reaction proceeds through the formation of an [Fe(II)-(PAA)2(H2O)2] complex, followed by the formation of a Fe(IV) complex, which can also be photoactivated to produce additional OH. Determining the characteristics of OH production from this reaction advances our knowledge of the sources of OH in cloudwater and provides a framework to optimize this reaction for OH output for wastewater treatment purposes.
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Affiliation(s)
- Steven
J. Campbell
- Department
of Atmospheric and Oceanic Sciences, University
of California at Los Angeles, 520 Portola Plaza, Los Angeles, California 90095, United States
| | - Chris La
- Department
of Atmospheric and Oceanic Sciences, University
of California at Los Angeles, 520 Portola Plaza, Los Angeles, California 90095, United States
| | - Qingyang Zhou
- Department
of Chemistry and Biochemistry, University
of California, Los Angeles, California 90095, United States
| | - Jason Le
- Department
of Atmospheric and Oceanic Sciences, University
of California at Los Angeles, 520 Portola Plaza, Los Angeles, California 90095, United States
| | - Jennyfer Galvez-Reyes
- Department
of Atmospheric and Oceanic Sciences, University
of California at Los Angeles, 520 Portola Plaza, Los Angeles, California 90095, United States
| | - Catherine Banach
- Department
of Atmospheric and Oceanic Sciences, University
of California at Los Angeles, 520 Portola Plaza, Los Angeles, California 90095, United States
| | - K. N. Houk
- Department
of Chemistry and Biochemistry, University
of California, Los Angeles, California 90095, United States
| | - Jie Rou Chen
- Department
of Atmospheric and Oceanic Sciences, University
of California at Los Angeles, 520 Portola Plaza, Los Angeles, California 90095, United States
| | - Suzanne E. Paulson
- Department
of Atmospheric and Oceanic Sciences, University
of California at Los Angeles, 520 Portola Plaza, Los Angeles, California 90095, United States
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Bendaas R, Bekkar Y, Messaadia L, Bourougaa L, Messaoudi A, Kiamouche S, Messaoud B. Computational-based investigation of antioxidative potential polyphenolic compounds of Salvia officinalis L.: combined DFT and molecular docking approaches. J Mol Model 2024; 30:87. [PMID: 38416254 DOI: 10.1007/s00894-024-05866-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Accepted: 02/03/2024] [Indexed: 02/29/2024]
Abstract
CONTEXT The antioxidant properties of the three polyphenolic compounds (carnosol, cirsiliol, and luteolin) of Salvia officinalis L. were investigated employing the density functional theory (DFT) calculations at the B3LYP of basis set at 6-311 + + G (d, p) in order to evaluate their antioxidant activity. The enthalpies of reactions associated with the SET-PT, SPLET, and HAT mechanisms were analyzed in gas and in different solvents using the CPCM (conductor-like polarizable continuum) model. For all possible hydrogen donor sites, the corresponding parameters (BDE, AIP, PDE, PA, ETE, HOMOs, and LUMOs) and reactivity indices (IPE, EA, Χ, η, S, and ω) were also evaluated. The calculated results showed that derivatives 12-OH, 11-OH, 4'-OH, and 3'-OH had the lowest antioxidant activity. The results showed as well that carnosol, cirsiliol, and luteolin have higher reactivity compared to ascorbic acid and could be considered better antioxidants. According to research, the catechol group is crucial in influencing the studied compounds antioxidant activity. The theoretically predicted order of antioxidant efficiencies in this work agrees well with the QSAR (quantitative structure-activity relationship) data. The findings show that in the vacuum as well as benzene media. HAT would be the most effective mechanism; in contrast, the thermodynamic equilibrium approach in polar media is the SPLET mechanism. Likewise, the outcomes of the docking modeling confirm that the selected molecules have high inhibitory activity to glutathione-S-transferases (GSTs) receptors. Moreover, they have very important pharmacokinetic, chemical, and biological profiles. Finally, all the results show that the three natural molecules have good pharmacokinetic profiles, particularly the bioavailability and permeability toward biological membranes. METHODS The software packages used in this investigation are Gaussian 16, Discovery studio Visualizer, and AutoDock vina. The three compounds (carnosol, cirsiliol, and luteolin) of Salvia officinalis L. were optimized with DFT/B3LYP of basis set at 6-311 + + G (d, p). The optimized structures were established via vibrational analysis (i.e., no imaginary frequencies in the frequency set). All enthalpies were zero-point (ZPE) corrected. Vibrational frequency calculations were performed at 298.15 K and 1 atmosphere pressure to determine the thermodynamic characteristics of the investigated reactions. The descriptors were associated with the antioxidant mechanisms for investigated molecules in vacuum and in various solvents. The molecular docking was used by AutoDock vina to estimate and evaluate the title compounds compatibility as potential antioxidant drugs utilizing appropriate receptor proteins. The solvation effect in the medium of benzene (ɛ = 2.27) and water (ɛ = 78.39) was taken into account. Furthermore, a methanol solvent (ɛ = 32.61) was also taken into consideration to compare with the empirical data.
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Affiliation(s)
- Ridha Bendaas
- Laboratory of Applied Energy and Materials (LEAM), University of Jijel, Jijel, Algeria
| | - Yahia Bekkar
- Laboratory of Valorization and Technology of Sahara Resources (VTRS), University of El Oued, B.P.789, 39000, El Oued, Algeria
| | - Lyamine Messaadia
- Laboratory of Applied Energy and Materials (LEAM), University of Jijel, Jijel, Algeria.
| | - Lotfi Bourougaa
- Laboratory of Molecular Chemistry and Environment (LMCE), University of Biskra, BP 145, 707000, Biskra, Algeria
| | - Abdelatif Messaoudi
- Laboratoire de Chimie Des Matériaux Et Des Vivants: Activité & Réactivité (LCMVAR), Département Chimie, Faculté Des Sciences de La Matière, Université de Batna 1, Batna, Algeria
| | - Samir Kiamouche
- Laboratory of Applied Energy and Materials (LEAM), University of Jijel, Jijel, Algeria
- Department of Environmental Engineering, Faculty of Engineering Process, University Constantine 3, 25000, Constantine, Algeria
| | - Benamira Messaoud
- Laboratory of Materials Interaction and Environment (LIME), Faculty of Exact Sciences and Computer Science, University of Jijel, 18000, Jijel, Algeria
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6
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Boukar O, Fifen JJ, Conradie J, Conradie MM. Solvation energies of the ferrous ion in water and in ammonia at various temperatures. J Mol Model 2024; 30:52. [PMID: 38285315 DOI: 10.1007/s00894-024-05839-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Accepted: 01/09/2024] [Indexed: 01/30/2024]
Abstract
CONTEXT The solvation of metal ions is crucial to understanding relevant properties in physics, chemistry, or biology. Therefore, we present solvation enthalpies and solvation free energies of the ferrous ion in water and ammonia. Our results agree well with the experimental reports for the hydration free energy and hydration enthalpy. We obtained [Formula: see text] kJ mol[Formula: see text] for the hydration free energy and [Formula: see text] kJ mol[Formula: see text] for the hydration enthalpy of ferrous ion in water at room temperature. At ambient temperature, we obtained [Formula: see text] kJ mol[Formula: see text] as the [Formula: see text] ammoniation free energy and [Formula: see text] kJ mol[Formula: see text] for the ammoniation enthalpy. In addition, the free energy of solvation is deeply affected when the temperature increases. This pattern can be attributed to the rise of entropy when the temperature rises. Besides, the temperature does not affect the ammoniation enthalpies and the hydration enthalpy of the [Formula: see text] ion. METHOD All the geometry optimizations are performed at the MP2 methods associated with the 6-31++g(d,p) basis set of Pople. solvated phase structures of [Formula: see text] ion in water or in ammonia are performed using the PCM model. The [Formula: see text] program suite was used to perform all the calculations. The program TEMPO was also used to evaluate the temperature sensitivity of the different obtained geometries.
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Affiliation(s)
- Ousman Boukar
- Department of Physics, Faculty of Science, University of Maroua, P.O. Box 46, Maroua, Cameroon.
| | - Jean Jules Fifen
- Quantum Theory and Aplications Unit, Department of Physics, Faculty of Science, The University of Ngaoundere, P.O. Box 454, Ngaoundere, Cameroon.
| | - Jeanet Conradie
- Department of Chemistry, University of the Free State, PO Box 339, Bloemfontein, 9300, South Africa
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Oliveira RR, Molpeceres G, Montserrat R, Fantuzzi F, Rocha AB, Kästner J. Gas-phase C 60H n+q ( n = 0-4, q = 0,1) fullerenes and fulleranes: spectroscopic simulations shed light on cosmic molecular structures. Phys Chem Chem Phys 2023; 25:25746-25760. [PMID: 37724022 DOI: 10.1039/d3cp03254j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/20/2023]
Abstract
The discovery of C60, C60+, and C70 in the interstellar medium has ignited a profound interest in the astrochemistry of fullerene and related systems. In particular, the presence of diffuse interstellar bands and their association with C60+ has led to the hypothesis that hydrogenated derivatives, known as fulleranes, may also exist in the interstellar medium and contribute to these bands. In this study, we systematically investigated the structural and spectroscopic properties of C60Hn+q (n = 0-4, q = 0,1) using an automated global minimum search and density functional theory calculations. Our results revealed novel global minimum structures for C60H2 and C60H4, distinct from previous reports. Notably, all hydrogenated fullerenes exhibited lower ionization potentials and higher proton affinities compared to C60. From an astrochemical perspective, our results exposed the challenges in establishing definitive spectroscopic criteria for detecting fulleranes using mid-infrared and UV-Vis spectroscopies. However, we successfully identified distinct electronic transitions in the near-infrared range that serve as distinctive signatures of cationic fulleranes. We strongly advocate for further high-resolution experimental studies to fully explore the potential of these transitions for the interstellar detection of fulleranes.
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Affiliation(s)
- Ricardo R Oliveira
- Chemistry Institute, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.
| | - Germán Molpeceres
- Department of Astronomy, Graduate School of Science, The University of Tokyo, Tokyo 113 0033, Japan
| | - Ricardo Montserrat
- Chemistry Institute, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.
| | - Felipe Fantuzzi
- School of Chemistry and Forensic Science, University of Kent, Canterbury CT2 7NH, UK
| | - Alexandre B Rocha
- Chemistry Institute, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.
| | - Johannes Kästner
- Institute for Theoretical Chemistry, University of Stuttgart, Stuttgart, Germany
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8
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Reyna-Luna J, Soriano-Agueda L, Vera CJ, Franco-Pérez M. Insights into the coordination chemistry of antineoplastic doxorubicin with 3d-transition metal ions Zn 2+, Cu 2+, and VO 2+: a study using well-calibrated thermodynamic cycles and chemical interaction quantum chemistry models. J Comput Aided Mol Des 2023:10.1007/s10822-023-00506-4. [PMID: 37245168 DOI: 10.1007/s10822-023-00506-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2023] [Accepted: 05/19/2023] [Indexed: 05/29/2023]
Abstract
We present a computational strategy based on thermodynamic cycles to predict and describe the chemical equilibrium between the 3d-transition metal ions Zn2+, Cu2+, and VO2+ and the widely used antineoplastic drug doxorubicin. Our method involves benchmarking a theoretical protocol to compute gas-phase quantities using DLPNO Coupled-Cluster calculations as reference, followed by estimating solvation contributions to the reaction Gibbs free energies using both explicit partial (micro)solvation steps for charged solutes and neutral coordination complexes, as well as a continuum solvation procedure for all solutes involved in the complexation process. We rationalized the stability of these doxorubicin-metal complexes by inspecting quantities obtained from the topology of their electron densities, particularly the bond critical points and non-covalent interaction index. Our approach allowed us to identify representative species in solution phase, infer the most likely complexation process for each case, and identify key intramolecular interactions involved in the stability of these compounds. To the best of our knowledge, this is the first study reporting thermodynamic constants for the complexation of doxorubicin with transition metal ions. Unlike other methods, our procedure is computationally affordable for medium-sized systems and provides valuable insights even with limited experimental data. Furthermore, it can be extended to describe the complexation process between 3d-transition metal ions and other bioactive ligands.
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Affiliation(s)
- Julieta Reyna-Luna
- Departamento de Física y Química Teórica, Facultad de Química, Universidad Nacional Autónoma de México, Cd. Universitaria, 04510, Ciudad de Mexico, México
| | - Luis Soriano-Agueda
- Donostia International Physics Center (DIPC), 20018, Donostia, Euskadi, Spain
| | - Christiaan Jardinez Vera
- Laboratorio de Modelado y Simulación Computacional en Nanomedicina, Escuela Superior de Apan, Universidad Autónoma del Estado de Hidalgo, Carretera Apan-Calpulalpan S/N, Colonia, 43920, Chimalpa Tlalayote, Hgo, México
| | - Marco Franco-Pérez
- Departamento de Física y Química Teórica, Facultad de Química, Universidad Nacional Autónoma de México, Cd. Universitaria, 04510, Ciudad de Mexico, México.
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9
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Thbayh DK, Palusiak M, Viskolcz B, Fiser B. Comparative study of the antioxidant capability of EDTA and Irganox. Heliyon 2023; 9:e16064. [PMID: 37234670 PMCID: PMC10205517 DOI: 10.1016/j.heliyon.2023.e16064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2023] [Revised: 04/27/2023] [Accepted: 05/04/2023] [Indexed: 05/28/2023] Open
Abstract
Oxidative stress makes it difficult to preserve food and negatively affect the applicability of polymeric packaging. It is typically caused by an excess of free radicals, and it is dangerous to human health, resulting in the onset and development of diseases. The antioxidant ability and activity of ethylenediaminetetraacetic acid (EDTA) and Irganox (Irg) as synthetic antioxidant additives were studied. Three different antioxidant mechanisms were considered and compared by calculating bond dissociation enthalpy (BDE), ionization potential (IP), proton dissociation enthalpy (PDE), proton affinity (PA), and electron transfer enthalpy (ETE) values. Two density functional theory (DFT) methods were used, M05-2X and M06-2X with the 6-311++G(2d,2p) basis set in gas phase. Both additives can be used to protect pre-processed food products and polymeric packaging from oxidative stress related material deterioration. By comparing the two studied compounds, it was found that EDTA has a higher antioxidant potential than Irganox. To the best of our knowledge several studies have been carried out to understand the antioxidant potential of various natural and synthetic species, but EDTA and Irganox were not compared and investigated before. These additives can be used to protect pre-processed food products and polymeric packaging and prevent material deterioration caused by oxidative stress.
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Affiliation(s)
- Dalal K. Thbayh
- Institute of Chemistry, University of Miskolc, 3515 Miskolc-Egyetemváros, Hungary
- Polymer Research Center, University of Basrah, Basrah, Iraq
- Higher Education and Industrial Cooperation Centre, University of Miskolc, 3515 Miskolc-Egyetemváros, Hungary
| | - Marcin Palusiak
- Department of Physical Chemistry, Faculty of Chemistry, University of Lodz, 90-236 Lodz, Poland
| | - Béla Viskolcz
- Institute of Chemistry, University of Miskolc, 3515 Miskolc-Egyetemváros, Hungary
- Higher Education and Industrial Cooperation Centre, University of Miskolc, 3515 Miskolc-Egyetemváros, Hungary
| | - Béla Fiser
- Higher Education and Industrial Cooperation Centre, University of Miskolc, 3515 Miskolc-Egyetemváros, Hungary
- Department of Physical Chemistry, Faculty of Chemistry, University of Lodz, 90-236 Lodz, Poland
- Ferenc Rakoczi II Transcarpathian Hungarian College of Higher Education, 90200 Beregszász, Transcarpathia, Ukraine
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10
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Workman KT, Usher AJ, Henson DW, White NJ, Gichuhi WK. Predicted Negative Ion Photoelectron Spectra of 1-, 2-, and 9-Cyanoanthracene Radical Anions and Computed Thermochemical Values of the Three Cyanoanthracene Isomers. J Phys Chem A 2023; 127:4063-4076. [PMID: 37116201 DOI: 10.1021/acs.jpca.3c01178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
In this work, the negative ion photoelectron spectra of 1-, 2-, and 9-cyanoanthracene (anthracenecarbonitrile, ACN) radical anions, obtained via the calculation of Franck-Condon (FC) factors based on a harmonic oscillator model, are reported. The FC calculations utilize harmonic vibrational frequencies and normal mode vectors derived from density functional theory using the B3LYP/6-311++G (2d,2p) basis set. The removal of an electron from the doublet anion allows for the computation of the negative ion photoelectron spectra that represents the neutral ground singlet state (So) and the lowest triplet state (T1) in each of the three ACN molecules. The respective adiabatic electron affinity (EA) values for the So state in 1-, 2-, and 9-ACN isomers are calculated to be 1.353, 1.360, and 1.423 eV. The calculated EA of the 9-cyanoanthracene singlet isomer is in close agreement with the previously reported experimental value of 1.27 ± 0.1 eV. Calculations show that the T1 states in 1-, 2-, and 9-ACN are located 1.656, 1.663, and 1.599 eV above the So state. The calculated T1 negative ion spectra exhibit intense vibrational origins and weak FC activity beyond the origins, indicating little change in geometry following electron detachment from the doublet anionic state. Upon deprotonation, the EA values of the radical isomers increase by ∼400-700 meV, resulting in neutral deprotonated radicals with EAs between 1.740 and 2.220 eV. The calculated site-specific gas-phase acidity values of ACN isomers indicate that ACN molecules are more acidic than benzonitrile.
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11
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Structures, Binding and Clustering Energies of Cu2+(MeOH)n=1-8 Clusters and Temperature Effects : A DFT Study. Polyhedron 2023. [DOI: 10.1016/j.poly.2023.116343] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
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12
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Workman KT, Firth RA, Gichuhi WK. From Benzonitrile to Dicyanobenzenes: The Effect of an Additional CN Group on the Thermochemistry and Negative Ion Photoelectron Spectra of Dicyanobenzene Radical Anions. J Phys Chem A 2023; 127:181-194. [PMID: 36592400 DOI: 10.1021/acs.jpca.2c07655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The negative ion photoelectron spectra of 1,2-dicyanobenzene (o-DCNB), 1,3-dicyanobenzene (m-DCNB), and 1,4-dicyanobenzene (p-DCNB) radical anions (DCNB·-), acquired through the computation of Frack-Condon (FC) factors, are presented. The FC calculations utilize harmonic frequencies and normal mode vectors derived from density functional theory at the B3LYP/aug-cc-pVQZ basis set. All the totally symmetric vibrational modes are treated with Duschinsky rotations to yield neutral DCNBs in their singlet (So) and lowest triplet (T1) states, following an electron removal from the doublet anionic ground state. For the So state, the adiabatic electron affinities (EAs) for o-, m-, and p-DCNB are 1.179, 1.103, and 1.348 eV. The EAs for the lowest T1 state in o-, m-, and p-DCNB are 4.151, 4.185, and 4.208 eV, resulting in an So-T1 energy difference (ΔEST) of 2.973, 3.082, and 2.860 eV. A vibrational analysis reveals evidence of FC activity involving ring distortion, C-N bending, and ring C═C stretching vibrational progressions in both the So and T1 states. With the detection of cyanonaphthalene (C10H7CN) and cyanoindene (C9H7CN) in the interstellar medium (ISM), our results highlight the extent to which replacing a single hydrogen on an aromatic molecule with a cyano group, C≡N, can alter the vibrational structure of the molecule/radical anion. As such, dicyano-polyaromatic hydrocarbons may be reasonably robust in the ISM, making it appealing to search for them in future interstellar detection missions.
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Affiliation(s)
- Kie T Workman
- Department of Chemistry, Tennessee Tech University, 1 William L. Jones Dr., Cookeville, Tennessee38505, United States.,Department of Chemical Engineering, Tennessee Tech University, 1 William L. Jones Dr., Cookeville, Tennessee38505, United States
| | - Rebecca A Firth
- Department of Chemistry, Tennessee Tech University, 1 William L. Jones Dr., Cookeville, Tennessee38505, United States
| | - Wilson K Gichuhi
- Department of Chemistry, Tennessee Tech University, 1 William L. Jones Dr., Cookeville, Tennessee38505, United States
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13
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Ding YF, Yin SF, Cai MQ. Enhanced photocatalytic toluene oxidation performance induced by two types of cooperative fluorine doping in polymeric carbon nitride with the first-principles calculations. J Colloid Interface Sci 2023; 630:452-459. [DOI: 10.1016/j.jcis.2022.10.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 09/27/2022] [Accepted: 10/08/2022] [Indexed: 11/21/2022]
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14
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Kaur C, Mandal D. The Scavenging Mechanism of Aminopyrines towards Hydroxyl Radical: A Computational Mechanistic and Kinetics Investigation. COMPUT THEOR CHEM 2022. [DOI: 10.1016/j.comptc.2022.113973] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
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15
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Photocatalytic Selective Oxidation of Toluene into Benzaldehyde on Mixed-Valence Vanadium Oxide V6O13 Catalyst with Density Functional Theory. Catal Letters 2022. [DOI: 10.1007/s10562-022-04184-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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16
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Biela M, Kleinová A, Klein E. Guaiacol oxidation: theoretical insight into thermochemistry of radical processes involving methoxy group demethylation. Free Radic Res 2022; 56:730-739. [PMID: 36669169 DOI: 10.1080/10715762.2023.2170880] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Guaiacol (2-methoxyphenol) is naturally occurring phenolic compound essential in various research areas. Oxidative transformation of guaiacol can lead to the formation of various products, including 1,3-benzodioxole or ortho-quinone. Therefore, this study is focused on the investigation of the reaction enthalpies of experimentally observed guaiacol oxidation pathways in gas-phase, as well as in non-polar environment and aqueous solution. Corresponding Density Functional Theory (DFT) calculations were carried out using two hybrid functionals (M06-2X and B3LYP-D3). All reaction enthalpies, as well as Gibbs free energies, were also calculated using composite ab initio G4 method. M06-2X and G4 results show mutual agreement and the best accordance with available experimentally determined reaction enthalpies. Obtained Gibbs free reaction energies indicate that formation of ortho-quinone is thermodynamically preferred to formation of 1,3-benzodioxole at 298 K in studied environments. Moreover, all computational methods confirm that the reaction enthalpy of methoxy group demethylation, i.e. O-C bond dissociation enthalpy (BDE), is substantially lower in comparison to the enthalpy of hydrogen atom transfer from phenolic OH group. In the case of phenoxide anion of guaiacol, which can be formed in ionization supporting solvents, O-C BDE shows further significant decrease, exceeding 50 kJ mol-1, in comparison to parent molecule.HIGHLIGHTSReaction enthalpies and Gibbs free energies of individual steps of guaiacol transformation to 1,3-benzodioxole or ortho-quinone are studied in three environments.M06-2X functional and composite ab initio G4 methods provide reliable O-H and O-C bond dissociation enthalpies.Dissociation enthalpy of methoxy group O-C bond is lower by ca. 100 kJ mol-1 in comparison to phenolic O-H bond.Phenoxide anion of guaiacol shows substantially lower O-C BDE than parent molecule.
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Affiliation(s)
- Monika Biela
- Institute of Physical Chemistry and Chemical Physics, Slovak University of Technology in Bratislava, Bratislava, Slovakia
| | - Andrea Kleinová
- Institute of Physical Chemistry and Chemical Physics, Slovak University of Technology in Bratislava, Bratislava, Slovakia
| | - Erik Klein
- Institute of Physical Chemistry and Chemical Physics, Slovak University of Technology in Bratislava, Bratislava, Slovakia
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17
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Bâldea I. Critical analysis of radical scavenging properties of atorvastatin in methanol recently estimated via density functional theory. COMPUT THEOR CHEM 2022. [DOI: 10.1016/j.comptc.2022.113898] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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18
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Thbayh DK, Reizer E, Kahaly MU, Viskolcz B, Fiser B. Antioxidant Potential of Santowhite as Synthetic and Ascorbic Acid as Natural Polymer Additives. Polymers (Basel) 2022; 14:polym14173518. [PMID: 36080595 PMCID: PMC9460313 DOI: 10.3390/polym14173518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2022] [Revised: 08/23/2022] [Accepted: 08/24/2022] [Indexed: 11/16/2022] Open
Abstract
A wide variety of additives are used to improve specific characteristics of the final polymeric product. Antioxidant additives (AAs) can prevent oxidative stress and thus the damage of polymeric materials. In this work, the antioxidant potential and thus the applicability of Santowhite (SW) as synthetic and ascorbic acid (Asc) as natural AAs were explored by using computational tools. Two density functional theory (DFT) methods, M05-2X and M06-2X, have been applied in combination with the 6-311++G(2d,2p) basis set in gas phase. Three antioxidant mechanisms have been considered: hydrogen atom transfer (HAT), single electron transfer-proton transfer (SET-PT), and sequential proton loss electron transfer (SPLET). Bond dissociation enthalpy (BDE), ionization potential (IP), proton dissociation enthalpy (PDE), proton affinity (PA), and electron transfer enthalpy (ETE) have been computed for each potential hydrogen donor site. The results indicate that the antioxidant potential of Asc is higher than SW. Furthermore, some of the C-H bonds, depending on their position in the structures, are potent radical scavengers, but O-H groups are more prone to donate H-atoms to free radicals. Nonetheless, both additives can be potentially applied to safeguard common polymers and prohibit oxidative stress-induced material deterioration.
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Affiliation(s)
- Dalal K. Thbayh
- Institute of Chemistry, University of Miskolc, 3515 Miskolc, Hungary
- Polymer Research Center, University of Basrah, 61004 Basrah, Iraq
- Higher Education and Industrial Cooperation Centre, University of Miskolc, 3515 Miskolc, Hungary
| | - Edina Reizer
- Institute of Chemistry, University of Miskolc, 3515 Miskolc, Hungary
| | - Mousumi U. Kahaly
- ELI-ALPS, ELI-HU Non-Profit Ltd., Wolfgang Sandner utca 3, 6728 Szeged, Hungary
- Institute of Physics, University of Szeged, Dóm tér 9, 6720 Szeged, Hungary
| | - Béla Viskolcz
- Institute of Chemistry, University of Miskolc, 3515 Miskolc, Hungary
- Higher Education and Industrial Cooperation Centre, University of Miskolc, 3515 Miskolc, Hungary
| | - Béla Fiser
- Institute of Chemistry, University of Miskolc, 3515 Miskolc, Hungary
- Higher Education and Industrial Cooperation Centre, University of Miskolc, 3515 Miskolc, Hungary
- Ferenc Rakoczi II Transcarpathian Hungarian College of Higher Education, 90200 Beregszász, Ukraine
- Correspondence:
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19
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Revealing the Mechanisms of Photocatalytic Toluene Selective Oxidation on Titanium Dioxide Cluster with Density Functional Theory Calculations. Catal Letters 2022. [DOI: 10.1007/s10562-022-04139-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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20
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Bâldea I. Why Ortho- and Para-Hydroxy Metabolites Can Scavenge Free Radicals That the Parent Atorvastatin Cannot? Important Pharmacologic Insight from Quantum Chemistry. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27155036. [PMID: 35956986 PMCID: PMC9370721 DOI: 10.3390/molecules27155036] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Revised: 07/31/2022] [Accepted: 08/02/2022] [Indexed: 11/16/2022]
Abstract
The pharmaceutical success of atorvastatin (ATV), a widely employed drug against the "bad" cholesterol (LDL) and cardiovascular diseases, traces back to its ability to scavenge free radicals. Unfortunately, information on its antioxidant properties is missing or unreliable. Here, we report detailed quantum chemical results for ATV and its ortho- and para-hydroxy metabolites (o-ATV, p-ATV) in the methanolic phase. They comprise global reactivity indices, bond order indices, and spin densities as well as all relevant enthalpies of reaction (bond dissociation BDE, ionization IP and electron attachment EA, proton detachment PDE and proton affinity PA, and electron transfer ETE). With these properties in hand, we can provide the first theoretical explanation of the experimental finding that, due to their free radical scavenging activity, ATV hydroxy metabolites rather than the parent ATV, have substantial inhibitory effect on LDL and the like. Surprisingly (because it is contrary to the most cases currently known), we unambiguously found that HAT (direct hydrogen atom transfer) rather than SPLET (sequential proton loss electron transfer) or SET-PT (stepwise electron transfer proton transfer) is the thermodynamically preferred pathway by which o-ATV and p-ATV in methanolic phase can scavenge DPPH• (1,1-diphenyl-2-picrylhydrazyl) radicals. From a quantum chemical perspective, the ATV's species investigated are surprising because of the nontrivial correlations between bond dissociation energies, bond lengths, bond order indices and pertaining stretching frequencies, which do not fit the framework of naive chemical intuition.
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Affiliation(s)
- Ioan Bâldea
- Theoretical Chemistry, Heidelberg University, Im Neuenheimer Feld 229, D-69120 Heidelberg, Germany
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21
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Boukar O, Fifen JJ, Malloum A, Nsangou M, Ghalila H, Conradie J. Solvation energies of ferrous ion in methanol at various temperatures. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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22
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Da-yang TE, Fifen JJ, Conradie J, Conradie MM. Structures, temperature effect, binding and clustering energies of Cu2+(MeOH)n=1-8 clusters and extrapolations. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119439] [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]
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23
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Firth RA, Dimino TL, Gichuhi WK. Negative Ion Photoelectron Spectra of Deprotonated Benzonitrile Isomers via Computation of Franck-Condon Factors. J Phys Chem A 2022; 126:4781-4790. [PMID: 35849483 DOI: 10.1021/acs.jpca.2c03220] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Negative ion photoelectron spectra of ortho (o-), meta (m-), and para (p-) deprotonated benzonitrile (o-, m-, p-C6H4(CN)-) isomers as well as the associated thermochemical values corresponding to deprotonation at o-, m-, and p-positions in C6H5(CN) are presented. Quantum mechanical results based on the density functional theory (DFT) utilizing the aug-cc-pVQZ basis set indicate that the o-, m-, p-C6H4(CN)● radicals have electron affinity values (EAs) of 1.901, 1.778, and 1.789 eV, respectively. The computed Franck-Condon (FC) factors give rise to o-, m-, and p-C6H4(CN)- negative ion spectra with FC active ring distortion vibrational modes with harmonic vibrational frequencies of ∼450, 760, and 1000 cm-1 as the dominant vibrational progressions. Deprotonation at the o-, m-, and p-positions in C6H5(CN) results in calculated gas-phase acidity values (ΔacidH298Ko) of 383.9, 385.7, and 385.3 kcal mol-1, respectively. The calculated ΔacidH298Ko is in close agreement with the previously reported high-pressure mass spectrometry experimental value of 383.4.0 ± 4.4 kcal mol-1. The computed ΔacidH298Ko and EAs are utilized to estimate the bond dissociation energy (DH298(H-C6H4CN)) associated with the formation o-, m-, and p-C6H4(CN)● using the negative ion thermochemical cycle: DH298(C6H5CN) = ΔacidH298Ko (H-C6H4(CN) + EA (C6H5CN)● - IP(H). The respective values of DH298(H-C6H4CN) corresponding to the formation of ortho, meta, and para C6H4(CN) radicals are 114.15, 113.11, and 113.51 kcal mol-1.
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Affiliation(s)
- Rebecca A Firth
- Department of Chemistry, Tennessee Tech University, 1 William L. Jones Dr., Cookeville, Tennessee 38505, United States
| | - Taylor L Dimino
- Department of Chemistry, Tennessee Tech University, 1 William L. Jones Dr., Cookeville, Tennessee 38505, United States.,Department of Chemical Engineering, Tennessee Tech University, 1 William L. Jones Dr., Cookeville, Tennessee 38505, United States
| | - Wilson K Gichuhi
- Department of Chemistry, Tennessee Tech University, 1 William L. Jones Dr., Cookeville, Tennessee 38505, United States
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Raczyńska ED, Gal JF, Maria PC, Sakhawat GS, Fahim MQ, Saeidian H. Nitriles with High Gas-Phase Basicity-Part II Transmission of the Push-Pull Effect through Methylenecyclopropene and Cyclopropenimine Scaffolds Intercalated between Different Electron Donor(s) and the Cyano N-Protonation Site. Molecules 2022; 27:4370. [PMID: 35889241 PMCID: PMC9323925 DOI: 10.3390/molecules27144370] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Revised: 07/02/2022] [Accepted: 07/04/2022] [Indexed: 11/16/2022] Open
Abstract
This work extends our earlier quantum chemical studies on the gas-phase basicity of very strong N-bases to two series of nitriles containing the methylenecyclopropene and cyclopropenimine scaffolds with dissymmetrical substitution by one or two electron-donating substituents such as Me, NR2, N=C (NR2)2, and N=P (NR2)3, the last three being strong donors. For a proper prediction of their gas-phase base properties, all potential isomeric phenomena and reasonable potential protonation sites are considered to avoid possible inconsistencies when evaluating the energetic parameters and associated protonation or deprotonation equilibria B + H+ = BH+. More than 250 new isomeric structures for neutral and protonated forms are analyzed. The stable structures are selected and the favored ones identified. The microscopic (kinetic) gas-phase basicity parameters (PA and GB) corresponding to N sites (cyano and imino in the cyclopropenimine or in the substituents) in each isomer are calculated. The macroscopic (thermodynamic) PAs and GBs, referring to the isomeric mixtures of favored isomers, are also estimated. The total (pushing) substituent effects are analyzed for monosubstituted and disubstituted derivatives containing two identical or two different substituents. Electron delocalization is examined in the two π-π conjugated transmitters, the methylenecyclopropene and cyclopropenimine scaffolds. The aromatic character of the three-membered ring is also discussed.
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Affiliation(s)
- Ewa D. Raczyńska
- Department of Chemistry, Warsaw University of Life Sciences (SGGW), 02-776 Warsaw, Poland
| | - Jean-François Gal
- Institut de Chimie de Nice, Université Côte d’Azur, Parc Valrose, 06108 Nice, France;
| | - Pierre-Charles Maria
- Institut de Chimie de Nice, Université Côte d’Azur, Parc Valrose, 06108 Nice, France;
| | - Ghulam Sakhi Sakhawat
- Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran P.O. Box 14515-775, Iran; (G.S.S.); (M.Q.F.)
| | - Mohammad Qasem Fahim
- Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran P.O. Box 14515-775, Iran; (G.S.S.); (M.Q.F.)
| | - Hamid Saeidian
- Department of Science, Payame Noor University (PNU), Tehran P.O. Box 19395-4697, Iran
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25
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Haiwang Djefoulna VH, Abia D, Jules Fifen J, Nsangou M, Jaidane NE. Rotational thermodynamic parameters for asymmetric-top molecules: classical vs. quantum approaches and new analytical partition function. Mol Phys 2022. [DOI: 10.1080/00268976.2022.2087565] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
| | - Daouda Abia
- Department of Chemistry, Faculty of Science, The University of Ngaoundere, Ngaoundere, Cameroon
| | - Jean Jules Fifen
- Quantum Theory and Aplications Unit, Department of Physics, Faculty of Science, The University of Ngaoundere, Ngaoundere, Cameroon
| | - Mama Nsangou
- Quantum Theory and Aplications Unit, Department of Physics, Faculty of Science, The University of Ngaoundere, Ngaoundere, Cameroon
- University of Maroua, Maroua, Cameroon
| | - Nejm-Eddine Jaidane
- Laboratoire de Spectroscopie Atomique Moléculaire et Applications, Faculté des Sciences de Tunis, Université de Tunis El Manar, Tunis, Tunisie
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26
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Computational study of synthetic and natural polymer additives – Antioxidant potential of BHA, TBHQ, BHT, and curcumin. Polym Degrad Stab 2022. [DOI: 10.1016/j.polymdegradstab.2022.109979] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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27
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Malloum A, Conradie J. Non-covalent interactions in dimethylsulfoxide (DMSO) clusters and DFT benchmarking. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.118522] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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28
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Dékány AÁ, Czakó G. Benchmark ab initio proton affinity and gas-phase basicity of α-alanine based on coupled-cluster theory and statistical mechanics. J Comput Chem 2022; 43:19-28. [PMID: 34676890 DOI: 10.1002/jcc.26767] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Revised: 09/16/2021] [Accepted: 09/27/2021] [Indexed: 11/06/2022]
Abstract
We determine the proton affinity (PA) and gas-phase basicity (GB) of amino acid α-alanine at a chemically accurate level by performing explicitly-correlated CCSD(T)-F12b/aug-cc-pVDZ geometry optimizations and normal mode vibrational frequency calculations as well as CCSD(T)-F12b/aug-cc-pVTZ energy computations at the possible neutral and protonated geometries. Temperature effects at 298.15 K considering translational, rotational, and vibrational enthalpy and entropy corrections are obtained via standard statistical mechanics utilizing the molecular geometries and the harmonic vibrational energy levels. Both the amino nitrogen (N) and the carbonyl oxygen (O) atoms are proven to be potential protonation sites and a systematic conformational search reveals 3 N- and 9 O-protonated conformers in the 0.00-7.88 and 25.43-30.43 kcal/mol energy ranges at 0 K, respectively. The final computed PA and GB values at (0)298.15 K in case of N-protonation are (214.47)216.80 and 207.07 kcal/mol, respectively, whereas the corresponding values for O-protonation are (189.04)190.63 and 182.31 kcal/mol. The results of the benchmark high-level coupled-cluster computations are utilized to assess the accuracy of several lower-level cost-effective methods such as MP2 and density functional theory with various functionals (SOGGA11-X, M06-2X, PBE0, B3LYP, M06, TPSS).
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Affiliation(s)
- Attila Á Dékány
- MTA-SZTE Lendület Computational Reaction Dynamics Research Group, Interdisciplinary Excellence Centre and Department of Physical Chemistry and Materials Science, Institute of Chemistry, University of Szeged, Szeged, Hungary
| | - Gábor Czakó
- MTA-SZTE Lendület Computational Reaction Dynamics Research Group, Interdisciplinary Excellence Centre and Department of Physical Chemistry and Materials Science, Institute of Chemistry, University of Szeged, Szeged, Hungary
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Ábrányi-Balogh P, Greiner I, Keglevich G. A Mechanistic Study on the Formation of Dronic Acids. Molecules 2021; 26:molecules26247587. [PMID: 34946669 PMCID: PMC8708247 DOI: 10.3390/molecules26247587] [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: 11/22/2021] [Revised: 12/09/2021] [Accepted: 12/09/2021] [Indexed: 11/20/2022] Open
Abstract
Dronic acid derivatives, important drugs against bone diseases, may be synthesized from the corresponding substituted acetic acid either by reaction with phosphorus trichloride in methanesulfonic acid as the solvent or by using also phosphorous acid as the P-reactant if sulfolane is applied as the medium. The energetics of the two protocols were evaluated by high-level quantum chemical calculations on the formation of fenidronic acid and benzidronic acid. The second option, involving (HO)2P-O-PCl2 as the nucleophile, was found to be more favorable over the first variation, comprising Cl2P-O-SO2Me as the real reagent, especially for the case of benzidronate.
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Affiliation(s)
- Péter Ábrányi-Balogh
- Research Centre for Natural Sciences, Medicinal Chemistry Research Group, 1117 Budapest, Hungary
- Correspondence: (P.Á.-B.); (G.K.); Tel.: +36-1-463-1111 (ext. 5883) (G.K.)
| | | | - György Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, 1521 Budapest, Hungary
- Correspondence: (P.Á.-B.); (G.K.); Tel.: +36-1-463-1111 (ext. 5883) (G.K.)
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30
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Malloum A, Conradie J. Structures, binding energies and non-covalent interactions of furan clusters. J Mol Graph Model 2021; 111:108102. [PMID: 34915345 DOI: 10.1016/j.jmgm.2021.108102] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Revised: 11/29/2021] [Accepted: 11/30/2021] [Indexed: 12/20/2022]
Abstract
Understanding of the furan solvent is subjected to the knowledge of the structures of the furan clusters and interactions taking place therein. Although, furan clusters can be very important to determine the dynamics and the properties of the furan solvent, there has been only a few investigations reported on furan dimer. In this work, we have explored the potential energy surfaces (PESs) of the furan clusters using two incremental levels of theory. Structures have been initially generated using classical molecular dynamics followed by full optimization at the MP2/aug-cc-pVDZ level of theory. The results show that the most stable structure of the furan dimer has a stacking configuration while that of the trimer has a cyclic configuration. We have noted that the structures of the furan tetramer have no definite configurations. In addition, we have performed a quantum theory of atoms in molecule (QTAIM) analysis to identify all possible non-covalent interactions of the furan clusters. The results show that six different types of non-covalent interactions can be identified in furan clusters. We have noted that the CH⋯C and CH⋯O hydrogen bondings are the strongest non-covalent interactions while the H⋯H bonding interaction is found to be the weakest. Furthermore, we have assessed the performance of ten DFT functionals in calculating the binding energies of the furan clusters. The ten DFT functionals (M05, M05-2X, M06, M06-2X, M08HX, PBE0, ωB97XD, PW6B95D3, APFD and MN15) have been benchmarked to DLPNO-CCSD(T)/CBS. The functionals M05-2X and M06 are recommended for further affordable investigations of the furan clusters.
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Affiliation(s)
- Alhadji Malloum
- Department of Chemistry, University of the Free State, PO BOX 339, Bloemfontein, 9300, South Africa; Department of Physics, Faculty of Science, University of Maroua, PO BOX 46, Maroua, Cameroon.
| | - Jeanet Conradie
- Department of Chemistry, University of the Free State, PO BOX 339, Bloemfontein, 9300, South Africa; Department of Chemistry, UiT - The Arctic University of Norway, N-9037 Tromsø, Norway
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Push–Pull Effect on the Gas-Phase Basicity of Nitriles: Transmission of the Resonance Effects by Methylenecyclopropene and Cyclopropenimine π-Systems Substituted by Two Identical Strong Electron Donors. Symmetry (Basel) 2021. [DOI: 10.3390/sym13091554] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
The gas-phase basicity of nitriles can be enhanced by a push–pull effect. The role of the intercalated scaffold between the pushing group (electron-donor) and the pulling (electron-acceptor) nitrile group is crucial in the basicity enhancement, simultaneously having a transmission function and an intrinsic contribution to the basicity. In this study, we examine the methylenecyclopropene and the N-analog, cyclopropenimine, as the smallest cyclic π systems that can be considered for resonance propagation in a push–pull system, as well as their derivatives possessing two strong pushing groups (X) attached symmetrically to the cyclopropene scaffold. For basicity and push–pull effect investigations, we apply theoretical methods (DFT and G2). The effects of geometrical and rotational isomerism on the basicity are explored. We establish that the protonation of the cyano group is always favored. The push–pull effect of strong electron donor X substituents is very similar and the two π-systems appear to be good relays for this effect. The effects of groups in the two cyclopropene series are found to be proportional to the effects in the directly substituted nitrile series X–C≡N. In parallel to the basicity, changes in electron delocalization caused by protonation are also assessed on the basis of aromaticity indices. The calculated proton affinities of the nitrile series reported in this study enrich the gas-phase basicity scale of nitriles to around 1000 kJ mol−1.
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Malloum A, Conradie J. Hydrogen bond networks of ammonia clusters: What we know and what we don’t know. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116199] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Leyton A, Rabanal‐León WA, Murillo‐López JA, Belmar J, Concepción O, Torre AF, Muñiz FM, Báez R, Jiménez CA. Novel 2‐Pyrazolin‐5‐one Derivative through Unforeseen Orthoamide Intermediate: Mechanistic Insights on Isocyanide Based [4+1] Cycloaddition. ChemistrySelect 2021. [DOI: 10.1002/slct.202101929] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Ariel Leyton
- Departamento de Química Orgánica Facultad de Ciencias Químicas Universidad de Concepción Edmundo Larenas 129 Concepción P.C. 4070371 Chile
| | - Walter A. Rabanal‐León
- Departamento de Química Analítica e Inorgánica Facultad de Ciencias Químicas Universidad de Concepción Edmundo Larenas 129 Concepción P.C. 4070371 Chile
| | - Juliana Andrea Murillo‐López
- Departamento de Ciencias Químicas Facultad de Ciencias Exactas Universidad Andres Bello Autopista Concepción-Talcahuano 7100 Talcahuano Chile
| | - Julio Belmar
- Departamento de Química Orgánica Facultad de Ciencias Químicas Universidad de Concepción Edmundo Larenas 129 Concepción P.C. 4070371 Chile
| | - Odette Concepción
- Departamento de Química Orgánica Facultad de Ciencias Químicas Universidad de Concepción Edmundo Larenas 129 Concepción P.C. 4070371 Chile
| | - Alexander F. Torre
- Departamento de Química Orgánica Facultad de Ciencias Químicas Universidad de Concepción Edmundo Larenas 129 Concepción P.C. 4070371 Chile
| | - Francisco M. Muñiz
- Departamento de Química Orgánica Facultad de Ciencias Químicas Universidad de Concepción Edmundo Larenas 129 Concepción P.C. 4070371 Chile
| | - Reynier Báez
- Departamento de Química Orgánica Facultad de Ciencias Químicas Universidad de Concepción Edmundo Larenas 129 Concepción P.C. 4070371 Chile
| | - Claudio A. Jiménez
- Departamento de Química Orgánica Facultad de Ciencias Químicas Universidad de Concepción Edmundo Larenas 129 Concepción P.C. 4070371 Chile
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Schorr P, Kovačević B, Volmer DA. Overestimation of 3α- over 3β -25-Hydroxyvitamin D 3 Levels in Serum: A Mechanistic Rationale for the Different Mass Spectral Properties of the Vitamin D Epimers. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2021; 32:1116-1125. [PMID: 33780622 DOI: 10.1021/jasms.1c00054] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The metabolism of vitamin D3 includes a parallel C-3 epimerization pathway-in addition to the standard metabolic processes for vitamin D3-reversing the stereochemical configuration of the -OH group at carbon-3 (β→α). While the biological function of the 3α epimer has not been elucidated yet, the additional species cannot be neglected in the analytical determination of vitamin D3, as it has the potential to introduce analytical errors if not properly accounted for. Recently, some inconsistent mass spectral behavior was seen for the 25-hydroxyvitamin D3 (25(OH)D3) epimers during quantification using electrospray LC-MS/MS. The present work extends that of Flynn et al. ( Ann. Clin. Biochem. 2014, 51, 352-559) and van den Ouweland et al. ( J. Chromatogr. B 2014, 967, 195-202), who reported larger electrospray ionization response factors for the 3α epimer of 25(OH)D3 in human serum samples as compared to the regular 3β variant. The present work was concerned with the mechanistic reasons for these differences. We used a combination of electrospray ionization, atmospheric pressure chemical ionization, and density functional theory calculations to uncover structural dissimilarities between the epimers. A plausible mechanism is described based on intramolecular hydrogen bonding in the gas phase, which creates a small difference of proton affinities between the epimers. More importantly, this mechanism allows the explanation of the different ionization efficiencies of the epimers based on kinetic control of the ionization process, where ionization initially takes place at the hydroxyl group with subsequent proton transfer to a basic carbon atom. The barrier for this transfer differs between the epimers and is in direct competition with H2O elimination from the protonated hydroxyl group. The "hidden" site of high gas phase basicity was revealed through computational calculations and appears to be inaccessible via direct protonation.
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Affiliation(s)
- Pascal Schorr
- Department of Chemistry, Humboldt University Berlin, 12489 Berlin, Germany
| | - Borislav Kovačević
- Group for Computational Life Sciences, Ruđer Bošković Institute, 10000 Zagreb, Croatia
| | - Dietrich A Volmer
- Department of Chemistry, Humboldt University Berlin, 12489 Berlin, Germany
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Quantum-Chemical Search for Keto Tautomers of Azulenols in Vacuo and Aqueous Solution. Symmetry (Basel) 2021. [DOI: 10.3390/sym13030497] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Keto-enol prototropic conversions for carbonyl compounds and phenols have been extensively studied, and many interesting review articles and even books appeared in the last 50 years. Quite a different situation takes place for derivatives of biologically active azulene, for which only scanty information on this phenomenon can be found in the literature. In this work, quantum-chemical studies have been undertaken for symmetrically and unsymmetrically substituted azulenols (constitutional isomers of naphthols). Stabilities of two enol (OH) rotamers and all possible keto (CH) tautomers have been analyzed in the gas phase {DFT(B3LYP)/6-311+G(d,p)} and also in aqueous solution {PCM(water)//DFT(B3LYP)/6-311+G(d,p)}. Contrary to naphthols, for which the keto forms can be neglected, at least one keto isomer (C1H, C2H, and/or C3H) contributes significantly to the tautomeric mixture of each azulenol to a higher degree in vacuo (non-polar environment) than in water (polar amphoteric solvent). The highest amounts of the CH forms have been found for 2- and 5-hydroxyazulenes, and the smallest ones for 1- and 6-hydroxy derivatives. The keto tautomer(s), together with the enol rotamers, can also participate in deprotonation reaction leading to a common anion and influence its acid-base properties. The strongest acidity in vacuo exhibits 6-hydroxyazulene, and the weakest one displays 1-hydroxyazulene, but all azulenols are stronger acids than phenol and naphthols. Bond length alternation in all DFT-optimized structures has been measured using the harmonic oscillator model of electron delocalization (HOMED) index. Generally, the HOMED values decrease for the keto tautomers, particularly for the ring containing the labile proton. Even for the keto tautomers possessing energetic parameters close to those of the enol isomers, the HOMED indices are low. However, some kind of parallelism exists for the keto forms between their relative energies and HOMEDs estimated for the entire molecules.
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Temperature-dependent oxidation of BSCAPE molecule in methanol medium. J Mol Graph Model 2021; 105:107850. [PMID: 33592351 DOI: 10.1016/j.jmgm.2021.107850] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Revised: 01/20/2021] [Accepted: 01/21/2021] [Indexed: 11/23/2022]
Abstract
Temperature-dependent solvation free energy and oxidation by free energy of ionization of 2-Phenylethyl (2E)-3-(1-benzenesulfonyl-4,5-dihydroxyphenyl) acrylate (BSCAPE) in methanol medium are the concerns of the present work. This molecule is a relevant phenolic acid enclosing multiple bioactivities. The explicit, implicit and discrete-continuum models of solvation were used. The methanol molecules were coordinated to this acid to form cluster complexes. The dual method M06-2X/6-31++G(d,p)//B3LYP/6-31G(d) was employed along with basis set superposition error correction. The results show that, the free energy of coordination and solvation are distant. Both quantities increase with temperature. From discrete-continuum treatment, there is non-spontaneity of solvation process, while coordination yielded spontaneity and non-spontaneity at cold and hot room temperatures, respectively. The ionization potential in gas phase, decreases with temperature. All the solvation models yielded lower ionization potential than that of gas phase. Thus, it follows that, the increase of temperature and methanol medium favours the oxidation of BSCAPE. Consequently, this favours its metabolism processes.
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38
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Boukar O, Fifen JJ, Nsangou M, Ghalila H, Conradie J. Structures and relative stability of hydrated ferrous ion clusters and temperature effects. NEW J CHEM 2021. [DOI: 10.1039/d1nj01849c] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Structures of solvated ferrous ion clusters have been investigated in the singlet and quintet spin states of the ferrous ion. Relative stabilities of isomers are also discussed at different temperatures.
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Affiliation(s)
- Ousman Boukar
- Department of Physics
- Faculty of Science
- University of Maroua
- Cameroon
| | - Jean Jules Fifen
- Quantum Theory and Aplications Unit
- Department of Physics
- Faculty of Science
- The University of Ngaoundere
- Ngaoundere
| | - Mama Nsangou
- Department of Physics
- Faculty of Science
- University of Maroua
- Cameroon
- Quantum Theory and Aplications Unit
| | - Hassen Ghalila
- Faculty of Science
- University of Tunis El Manar
- Tunis
- Tunisia
| | - Jeanet Conradie
- Department of Chemistry
- University of the Free State
- Bloemfontein
- South Africa
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39
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Malloum A, Fifen JJ, Conradie J. Determination of the absolute solvation free energy and enthalpy of the proton in solutions. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2020.114919] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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40
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Djefoulna VHH, Fifen JJ, Malloum A, Jaidane NE. Rotational thermodynamic parameters for symmetric-top, linear-top and spherical-top molecules: classical versus quantum approach and New analytical partition functions. Theor Chem Acc 2020. [DOI: 10.1007/s00214-020-02674-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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41
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Polynski MV, Sapova MD, Ananikov VP. Understanding the solubilization of Ca acetylide with a new computational model for ionic pairs. Chem Sci 2020; 11:13102-13112. [PMID: 34094492 PMCID: PMC8163204 DOI: 10.1039/d0sc04752j] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2020] [Accepted: 10/07/2020] [Indexed: 01/05/2023] Open
Abstract
The unique reactivity of the acetylenic unit in DMSO gives rise to ubiquitous synthetic methods. We theoretically consider CaC2 solubility and protolysis in DMSO and formulate a strategy for CaC2 activation in solution-phase chemical transformations. For this, we use a new strategy for the modeling of ionic compounds in strongly coordinating solvents combining Born-Oppenheimer molecular dynamics with the DFTB3-D3(BJ) Hamiltonian and static DFT computations at the PBE0-D3(BJ)/pob-TZVP-gCP level. We modeled the thermodynamics of CaC2 protolysis under ambient conditions, taking into account its known heterogeneity and considering three polymorphs of CaC2. We give a theoretical basis for the existence of the elusive intermediate HC[triple bond, length as m-dash]C-Ca-OH and show that CaC2 insolubility in DMSO is of thermodynamic nature. We confirm the unique role of water and specific properties of DMSO in CaC2 activation and explain how the activation is realized. The proposed strategy for the utilization of CaC2 in sustainable organic synthesis is outlined.
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Affiliation(s)
- Mikhail V Polynski
- Saint Petersburg State University Universitetsky Prospect 26 Saint Petersburg 198504 Russia
- Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences Leninsky Prospect 47 Moscow 119991 Russia
| | - Mariia D Sapova
- Saint Petersburg State University Universitetsky Prospect 26 Saint Petersburg 198504 Russia
| | - Valentine P Ananikov
- Saint Petersburg State University Universitetsky Prospect 26 Saint Petersburg 198504 Russia
- Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences Leninsky Prospect 47 Moscow 119991 Russia
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42
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Valadbeigi Y. Effects of intramolecular hydrogen bond and electron delocalization on the basicity of proton sponges and superbases with benzene, pyridine, pyrazine and pyrimidine scaffolds. COMPUT THEOR CHEM 2020. [DOI: 10.1016/j.comptc.2020.112947] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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43
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Sammut Bartolo N, Zoidis G, Gikas E, Benaki D, Ferrito V, Serracino-Inglott A. A multi-technique analytical approach for impurity profiling during synthesis: The case of difluprednate. J Pharm Biomed Anal 2020; 190:113483. [DOI: 10.1016/j.jpba.2020.113483] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 07/15/2020] [Accepted: 07/16/2020] [Indexed: 11/29/2022]
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44
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Saadat K, Shiri A, Kovačević B. Step Forward to Stronger Neutral Organic Superbases: Fused Troponimines. J Org Chem 2020; 85:11375-11381. [DOI: 10.1021/acs.joc.0c01466] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kayvan Saadat
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, 91775-1436 Mashhad, Iran
| | - Ali Shiri
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, 91775-1436 Mashhad, Iran
| | - Borislav Kovačević
- Group for Computational Life Science, Division of Chemistry, Ruder Boskovic Institute, Bijenicka 54, 10000 Zagreb, Croatia
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Zhang R, Warren JJ. Controlling the Oxygen Reduction Selectivity of Asymmetric Cobalt Porphyrins by Using Local Electrostatic Interactions. J Am Chem Soc 2020; 142:13426-13434. [DOI: 10.1021/jacs.0c03861] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Rui Zhang
- Simon Fraser University, Department of Chemistry, 8888 University Drive, Burnaby BC V5A 1S6 Canada
| | - Jeffrey J. Warren
- Simon Fraser University, Department of Chemistry, 8888 University Drive, Burnaby BC V5A 1S6 Canada
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46
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Miller ZM, Zhang JD, Donald WA, Prell JS. Gas-Phase Protonation Thermodynamics of Biological Lipids: Experiment, Theory, and Implications. Anal Chem 2020; 92:10365-10374. [PMID: 32628014 DOI: 10.1021/acs.analchem.0c00613] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Phospholipids are important to cellular function and are a vital structural component of plasma and organelle membranes. These membranes isolate the cell from its environment, allow regulation of the internal concentrations of ions and small molecules, and host diverse types of membrane proteins. It remains extremely challenging to identify specific membrane protein-lipid interactions and their relative strengths. Native mass spectrometry, an intrinsically gas-phase method, has recently been demonstrated as a promising tool for identifying endogenous protein-lipid interactions. However, to what extent the identified interactions reflect solution- versus gas-phase binding strengths is not known. Here, the "Extended" Kinetic Method and ab initio computations at three different levels of theory are used to experimentally and theoretically determine intrinsic gas-phase basicities (GB, ΔG for deprotonation of the protonated base) and proton affinities (PA, ΔH for deprotonation of the protonated base) of six lipids representing common phospholipid types. Gas-phase acidities (ΔG and ΔH for deprotonation) of neutral phospholipids are also evaluated computationally and ranked experimentally. Intriguingly, it is found that two of these phospholipids, sphingomyelin and phosphatidylcholine, have the highest GB of any small, monomeric biomolecules measured to date and are more basic than arginine. Phosphatidylethanolamine and phosphatidylserine are found to be similar in GB to basic amino acids lysine and histidine, and phosphatidic acid and phosphatidylglycerol are the least basic of the six lipid types studied, though still more basic than alanine. Kinetic Method experiments and theory show that the gas-phase acidities of these phospholipids are high but less extreme than their GB values, with phosphatidylserine and phosphatidylglycerol being the most acidic. These results indicate that sphingomyelin and phosphatidylcholine lipids can act as charge-reducing agents when dissociated from native membrane protein-lipid complexes in the gas phase and provide a straightforward model to explain the results of several recent native mass spectrometry studies of protein-lipid complexes.
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Affiliation(s)
- Zachary M Miller
- Department of Chemistry and Biochemistry, University of Oregon, Eugene, Oregon 97403-1253, United States
| | - J Diana Zhang
- School of Chemistry, University of New South Wales, Sydney, New South Wales, Australia, 2052
| | - W Alexander Donald
- School of Chemistry, University of New South Wales, Sydney, New South Wales, Australia, 2052
| | - James S Prell
- Department of Chemistry and Biochemistry, University of Oregon, Eugene, Oregon 97403-1253, United States.,Materials Science Institute, University of Oregon, Eugene, Oregon 97403-1252, United States
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47
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Understanding the Photo- and Electro-Carboxylation of o-Methylbenzophenone with Carbon Dioxide. Catalysts 2020. [DOI: 10.3390/catal10060664] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The lack of understanding of the radical reaction mechanism of Carbon dioxide (CO2) in photo- and electro-catalysis results in the development of such applications far behind the traditional synthesis methods. Using methylbenzophenone as the model, we clarify and compare the photo-enolization/Diels−Alder (PEDA) mechanism for photo-carboxylation and the two-step single-electron reduction pathway for electro-carboxylation with CO2 through careful control experiments. The regioselective carboxylation products, o-acylphenylacetic acid and α-hydroxycarboxylic acid are obtained, respectively, in photo- and electro-chemistry systems. On the basis of understanding the mechanism, a one-pot step-by-step dicarboxylation of o-methylbenzophenone is designed and conducted. Both the experimental results and related density functional theory (DFT) calculation verify the feasibility of the possible pathway in which electro-carboxylation is conducted right after photo-carboxylation in one vessel. This synthesis approach may provide a mild, eco-friendly strategy for the production of polycarboxylic acids in industry.
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48
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Raczyńska ED, Kurpiewski J, Igielska M, Kamińska B. Quantitative description of bond lengths alternation for caffeine−effects of ionization, proton-transfer, and noncovalent interaction. COMPUT THEOR CHEM 2020. [DOI: 10.1016/j.comptc.2020.112811] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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49
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Raczyńska ED, Gal JF, Maria PC, Kamińska B, Igielska M, Kurpiewski J, Juras W. Purine tautomeric preferences and bond-length alternation in relation with protonation-deprotonation and alkali metal cationization. J Mol Model 2020; 26:93. [PMID: 32248379 PMCID: PMC7256107 DOI: 10.1007/s00894-020-4343-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2019] [Accepted: 03/05/2020] [Indexed: 11/03/2022]
Abstract
Quantum chemical calculations were carried out for deprotonated (P-) and protonated purine (PH+) and for adducts with one alkali metal cation (P-M+ and PM+, where M+ is Li+ or Na+) in the gas phase {B3LYP/6-311+G(d,p)}, a model of perfectly apolar environment, and for selected structures in aqueous solution {PCM(water)//B3LYP/6-311+G(d,p)}, a reference polar medium for biological studies. All potential isomers of purine derivatives were considered, the favored structures indicated, and the preferred sites for protonation/deprotonation and cationization reactions determined. Proton and metal cation basicities of purine in the gas phase were discussed and compared with those of imidazole and pyrimidine. Bond-length alternations in the P, PH+, P-M+, and PM+ forms were quantitatively measured using the harmonic oscillator model of electron delocalization (HOMED) indices and compared with those for P. Variations of the HOMED values when proceeding from the purine structural building blocks, pyrimidine and imidazole, to the bicyclic purine system were also examined. Generally, the isolated NH isomers exhibit a strongly delocalized π-system (HOMED > 0.8). Deprotonation slightly increases the HOMED values, whereas protonation and cationization change the HOMED indices in different way. For bidentate M+-adducts, the HOMED values are larger than 0.9 like for the largely delocalized P-. The HOMED values correlate well in a comprehensive relationship with the relative Gibbs energies (ΔG) calculated for individual isomers whatever the purine form is, neutral, protonated, or cationized. When PCM-DFT model was utilized for P-, PH+, PM+, and P-M+ (M+ = Li+) both electron delocalization and relative stability are different from those for the molecules in vacuo. The solvation effects cause a slight increase in HOMEDs, whereas the ΔEs decrease, but in different ways. Hence, contribution of particular isomers in the isomeric mixtures of PH+, PM+, and P-M+ also varies. HOMED variations for the favored neutral, deprotonated, protonated, and lithiated forms of purine in the gas phase and aqueous solution.
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Affiliation(s)
- Ewa D Raczyńska
- Department of Chemistry, Warsaw University of Life Sciences (SGGW), 02-776, Warszawa, Poland.
| | - Jean-François Gal
- Université Côte d'Azur, CNRS, Institut de Chimie de Nice, UMR 7272, 06108, Nice, France
| | - Pierre-Charles Maria
- Université Côte d'Azur, CNRS, Institut de Chimie de Nice, UMR 7272, 06108, Nice, France
| | - Beata Kamińska
- Department of Chemistry, Warsaw University of Life Sciences (SGGW), 02-776, Warszawa, Poland
| | - Małgorzata Igielska
- Department of Biotechnology, Warsaw University of Life Sciences (SGGW), 02-776, Warszawa, Poland
| | - Julian Kurpiewski
- Department of Biotechnology, Warsaw University of Life Sciences (SGGW), 02-776, Warszawa, Poland
| | - Weronika Juras
- Department of Biotechnology, Warsaw University of Life Sciences (SGGW), 02-776, Warszawa, Poland
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Malloum A, Fifen JJ, Conradie J. Large-Sized Ammonia Clusters and Solvation Energies of the Proton in Ammonia. J Comput Chem 2020; 41:21-30. [PMID: 31568565 DOI: 10.1002/jcc.26071] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2019] [Revised: 08/19/2019] [Accepted: 08/28/2019] [Indexed: 01/10/2023]
Abstract
The absolute solvation energies (free energies and enthalpies) of the proton in ammonia are used to compute the pKa of species embedded in ammonia. They are also used to compute the solvation energies of other ions in ammonia. Despite their importance, it is not possible to determine experimentally the solvation energies of the proton in a given solvent. We propose in this work a direct approach to compute the solvation energies of the proton in ammonia from large-sized neutral and protonated ammonia clusters. To undertake this investigation, we performed a geometry optimization of neutral and protonated ammonia 30-mer, 40-mer, and 50 mer to locate stable structures. These structures have been fully optimized at both APFD/6-31++g(d,p) and M06-2X/6-31++g(d,p) levels of theory. An infrared spectroscopic study of these structures has been provided to assess the reliability of our investigation. Using these structures, we have computed the absolute solvation free energy and the absolute solvation enthalpy of the proton in ammonia. It comes out that the absolute solvation free energy of the proton in ammonia is calculated to be -1192 kJ mol-1 , whereas the absolute solvation enthalpy is evaluated to be -1214 kJ mol-1 . © 2019 Wiley Periodicals, Inc.
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Affiliation(s)
- Alhadji Malloum
- Department of Chemistry, University of the Free State, Bloemfontein, 9300, South Africa
| | - Jean J Fifen
- Department of Physics, Faculty of Science, The University of Ngaoundere, 454, Ngaoundere, Cameroon
| | - Jeanet Conradie
- Department of Chemistry, University of the Free State, Bloemfontein, 9300, South Africa
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