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Babu V, Ahmed S, Rahiman AK, Kawsar SMA, Berredjem M, Bhat AR, Basha KA. Computational Chemistry: Prediction of Compound Accessibility of Targeted Synthesized Compounds. Med Chem 2024; 20:MC-EPUB-139820. [PMID: 38638049 DOI: 10.2174/0115734064293464240405050455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2023] [Revised: 02/28/2024] [Accepted: 03/12/2024] [Indexed: 04/20/2024]
Abstract
INTRODUCTION In the present work, a series of novel pyridine carboxamides 3(a-h) were synthesized and screened with antibacterial activity. This research explores the application of Density Functional Theory (DFT) in studying biological systems at the quantum mechanical level, particularly in the context of drug design. DFT offers a streamlined approach to quantum mechanical calculations, making it indispensable in various scientific fields, and for its exceptional accuracy, reduced computational time, and cost-effectiveness has become a pivotal tool in computational chemistry. This research work highlights the integration of DFT studies with POM analyses, which effectively identify pharmacophoric sites. Moreover, the research incorporates in silico pharmacokinetics analyses to assess the pharmacokinetic properties of synthesized compounds. The paper focused on a series of compounds previously reported, aiming to provide a comprehensive understanding of their electronic structure, pharmacophoric features, and potential as drug candidates. This study not only contributes to the evolving field of computational chemistry but also holds implications for advancing drug design processes by combining theoretical insights with practical analyses. METHODS The compounds 3(a-h) were subjected to Density Functional Theory (DFT) computations using the B3LYP/6-31G(d) basis set to get optimized geometric structures. GaussViewis used to display the contributions of the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO). The determination of energy gaps was conducted using Gaussian 09W. The pharmacokinetic profiles were evaluated using existing techniques such as Osiris, Petra, and Molinspiration, as well as a novel platform called POM Analyse. RESULTS The computational studies DFT, POM and in silico pharmacokinetics studies revealed that the studied compounds are biologically active, non-toxic, non-carcinogenic in nature and may be utilized as drug candidates. CONCLUSION Density functional theory (DFT) investigations emphasize the exceptional stability of complex 3d, which possesses the biggest energy gap and the lowest softness. In contrast, compound 3h demonstrates poorer stability among the tested compounds, characterized by the lowest energy gap and the highest softness values. These findings are further substantiated by absolute energy calculations. The negligible energy difference in compound 3h indicates an increased transfer of electric charge within the molecule, which is associated with its enhanced biological effectiveness. The drug-likeness of the compounds is confirmed by POM and in silico pharmacokinetics investigations, with compound 3h being identified as the most biologically active among the investigated compounds.
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Affiliation(s)
| | - Sumeer Ahmed
- Post-Graduate and Research Department of Chemistry, The New College (Autonomous), University of Madras, Chennai 600014, India
| | - A K Rahiman
- Post-Graduate and Research Department of Chemistry, The New College (Autonomous), University of Madras, Chennai 600014, India
| | - Sarkar M A Kawsar
- Laboratory of Carbohydrate and Nucleoside Chemistry, Department of Chemistry, University of Chittagong, Chittagong, Bangladesh
| | - Malika Berredjem
- Laboratory of Applied Organic Chemistry LCOA, Synthesis of Biomolecules and Molecular Modelling Group, BadjiMokhtar - Annaba University, Box 12- 23000 Annaba, Algeria
| | - Ajmal R Bhat
- Department of Chemistry, RTM Nagpur University, Nagpur- 440033, India
| | - K Anver Basha
- P G and Research Department of Chemistry, C. Abdul Hakeem College, Melvisharam - 632 509, Tamil Nadu, India
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Bhattacharyya HP, Sarma M. Efficiency Conceptualization Model: A Theoretical Method for Predicting the Turnover of Catalysts. Chemphyschem 2024:e202400004. [PMID: 38619023 DOI: 10.1002/cphc.202400004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2024] [Revised: 04/11/2024] [Accepted: 04/15/2024] [Indexed: 04/16/2024]
Abstract
In recent times, the theoretical prediction of catalytic efficiency is of utmost urgency. With the advent of density functional theory (DFT), reliable computations can delineate a quantitative aspect of the study. To this state-of-the art approach, valuable incorporation would be a tool that can acknowledge the efficiency of a catalyst. In the current work, we developed the efficiency conceptualization model (ECM) method that utilizes the quantum mechanical tool to achieve efficiency in terms of turnover frequency (TOF). Twenty-six experimentally designed transition metal (TM) water oxidation catalysts were chosen under similar experimental conditions of temperature, pressure, and pH to execute the same. The computations conclude that the Fe based [Fe(OTf)2(Me2Pytacn)] (MWOC-17) is a highly active catalyst and, therefore, can endure for more time in the catalytic cycle. Our results conclude that the Ir-based catalysts [Cp∗Ir(κ2-N,O)X] with MWOC-23: X = Cl; and MWOC-24: X = NO3 report the highest computed turnover numbers (TONs), Γ0computed TON of 406 and 490 against the highest experimental TONs, Γ0 experimental TON of 2000 and 1200 respectively, whereas the Co-based [Co(12-TMC)]2+ (MWOC-19) has the lowest TONs (Γ0computed TON = 19, Γ0 experimental TON= 16) among the chosen catalysts and thereby successful in corroborating the previous experimental results.
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Affiliation(s)
| | - Manabendra Sarma
- IIT Guwahati: Indian Institute of Technology Guwahati, Chemistry, Chemistry Department, 781039, Guwahati, INDIA
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Pada Sarker H, Abild-Pedersen F, Bajdich M. Prediction of Feasibility of Polaronic OER on (110) Surface of Rutile TiO 2. Chemphyschem 2024:e202400060. [PMID: 38427793 DOI: 10.1002/cphc.202400060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2024] [Revised: 02/23/2024] [Accepted: 02/28/2024] [Indexed: 03/03/2024]
Abstract
The polaronic effects at the atomic level hold paramount significance for advancing the efficacy of transition metal oxides in applications pertinent to renewable energy. The lattice-distortion mediated localization of photoexcited carriers in the form of polarons plays a pivotal role in the photocatalysis. This investigation focuses on rutile TiO2, an important material extensively explored for solar energy conversion in artificial photosynthesis, specifically targeting the generation of green H2 through photoelectrochemical (PEC) H2O splitting. By employing Hubbard-U corrected and hybrid density functional theory (DFT) methods, we systematically probe the polaronic effects in the catalysis of oxygen evolution reaction (OER) on the (110) surface of rutile TiO2. Theoretical understanding of polarons within the surface, coupled with simulations of OER at distinct titanium (Ti) and oxygen (O) active sites, reveals diverse polaron formation energies within the lattice sites with strong preference for bulk and surface bridge (Ob) oxygen sites. Moreover, we provide the evidence for the facilitative role of polarons in OER. We find that hole polarons situated at the equatorial oxygen sites near the Ti-active site, along with bridge site hole polarons distal from the Ob active site yield a small reduction in OER overpotential by ~0.06 eV and ~0.12 eV, respectively. However, subsurface, equatorial, and bridge site hole polarons significantly reduce the Ti-active site OER overpotential by ~0.4 eV through the peroxo-type oxygen pathway. We also observe that the presence of hole polarons stabilizes the *OH, *O, and *OOH intermediate species compared to the scenario without hole polarons. Overall, this study provides a detailed mechanistic insight into polaron-mediated OER, offering a promising avenue for improving the catalytic activity of transition metal oxide-based photocatalysts catering to renewable energy requisites.
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Affiliation(s)
- Hori Pada Sarker
- Liquid Sunlight Alliance (LiSA), California Institute of Technology, Pasadena, CA, 91125, USA
- Department of Chemical Engineering, Stanford University, 43 Via Ortega, Stanford, CA, 94305, USA
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - Frank Abild-Pedersen
- Liquid Sunlight Alliance (LiSA), California Institute of Technology, Pasadena, CA, 91125, USA
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - Michal Bajdich
- Liquid Sunlight Alliance (LiSA), California Institute of Technology, Pasadena, CA, 91125, USA
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
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Dezena RMB, Rosa PCP. Unlocking the secrets of doxepin hydrochloride's crystal structure: Insights from high-quality powder diffraction analysis. Ann Pharm Fr 2024; 82:369-372. [PMID: 37884079 DOI: 10.1016/j.pharma.2023.10.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 10/10/2023] [Accepted: 10/19/2023] [Indexed: 10/28/2023]
Abstract
Doxepin hydrochloride, a versatile pharmaceutical compound, has been the subject of extensive research aimed at elucidating its crystal structure and solid-state characteristics. In this manuscript, we explore the significance of high-quality powder diffraction data in unveiling the intricate details of doxepin hydrochloride's crystal lattice. By examining the refined atom coordinates, density functional theory (DFT) optimization, and intermolecular interactions, we gain valuable insights into its structural conformation. This knowledge highlights the importance of precise crystallographic data in advancing our understanding of complex compounds and their pharmaceutical applications.
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Affiliation(s)
- Renan Marcel Bonilha Dezena
- Preformulation Specialist Consultant, Pharmaceutical Industry, Campinas, São Paulo, Brazil; Faculty of Pharmaceutical Sciences, University of Campinas (UNICAMP), Campinas, São Paulo, Brazil.
| | - Paulo César Pires Rosa
- Faculty of Pharmaceutical Sciences, University of Campinas (UNICAMP), Campinas, São Paulo, Brazil
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D'haese LCG, Daugey N, Pitrat D, Brotin T, Kapitán J, Liégeois V. Understanding the surrounding effects on Raman optical activity signatures of a chiral cage system: Cryptophane-PP-111. Spectrochim Acta A Mol Biomol Spectrosc 2024; 306:123484. [PMID: 37898056 DOI: 10.1016/j.saa.2023.123484] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Revised: 09/18/2023] [Accepted: 10/01/2023] [Indexed: 10/30/2023]
Abstract
Cryptophane molecules are cage-like structures consisting in two hemispheres, each made of three benzene rings. These hemispheres are bound together with three O(CH2)nOlinkers of various lengths giving rise to a plethora of cryptophane derivatives. Moreover, they are able to encapsulate neutral guests: CH2Cl2, CHCl3, …; and charged species: Cs+, Tl+, …. Finally, they exhibit chiroptical properties thanks to the anti arrangement of the linkers between the hemispheres. This work focuses on the Raman optical activity (ROA) signatures of Cryptophane-111 (n=1 for each linker). More specifically, we aim at simulating accurately its ROA spectra with and without a xenon atom inside its cavity. Experimental data (Buffeteau et al., 2017) have already demonstrated the effect of the encapsulation in the low-wavenumbers region. To generate the initial structures, we rely on the novel Conformer-Rotamer Ensemble Sampling Tool (CREST) program, developed by S. Grimme and co-workers. This is required due to the flexibility provided by the linkers. The CREST algorithm seems promising and has already been used to sample the potential energy surface (PES) of target systems before the simulation of their vibrational spectroscopies (Eikås et al., 2022). We observe large similarities between the two sets of conformers (one with and one without Xe encapsulated), demonstrating the robustness of the CREST algorithm. For corresponding structures, the presence of xenon pushed the two hemispheres slightly further apart. After optimization at the DFT level, only one unique conformer has a Boltzmann population ratio greater than 1%, pointing out the relative rigidity of the cage. Based on this unique conformer, our simulations are in good agreement with the experimental data. Regarding xenon encapsulation, the (experimental and theoretical) ROA signatures at low wavenumbers are impacted: slight shifts in wavenumbers are observed as well as a decrease in relative ROA intensity for bands around 150 cm-1. The wavenumber shifts were very well reproduced by our simulations, but the experimental decrease in the ROA intensity was unfortunately not reproduced.
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Affiliation(s)
- Lou C G D'haese
- Theoretical Chemistry Laboratory (LCT), Namur Institute of Structured Matter (NISM), University of Namur, 5000 Namur, Belgium.
| | - Nicolas Daugey
- Groupe Spectroscopie Moléculaire (GSM), Institut des Sciences Moléculaires (ISM), UMR-5255 CNRS, University of Bordeaux, 33405 Talence, France
| | - Delphine Pitrat
- Laboratoire de Chimie de l'ENSL, UMR-5182 CNRS, University of Lyon, 69342 Lyon, France
| | - Thierry Brotin
- Laboratoire de Chimie de l'ENSL, UMR-5182 CNRS, University of Lyon, 69342 Lyon, France
| | - Josef Kapitán
- Department of Optics, Palacký University of Olomouc, 77146 Olomouc, Czech Republic
| | - Vincent Liégeois
- Theoretical Chemistry Laboratory (LCT), Namur Institute of Structured Matter (NISM), University of Namur, 5000 Namur, Belgium
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Shiri F, Ho CC, Bissember AC, Ariafard A. Advancing Gold Redox Catalysis: Mechanistic Insights, Nucleophilicity-Guided Transmetalation, and Predictive Frameworks for the Oxidation of Aryl Gold(I) Complexes. Chemistry 2024; 30:e202302990. [PMID: 37967304 DOI: 10.1002/chem.202302990] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Indexed: 11/17/2023]
Abstract
Gold redox catalysis, often facilitated by hypervalent iodine(III) reagents, offers unique reactivity but its progress is mainly hindered by an incomplete mechanistic understanding. In this study, we investigated the reaction between the gold(I) complexes [(aryl)Au(PR3 )] and the hypervalent iodine(III) reagent PhICl2 , both experimentally and computationally and provided an explanation for the formation of divergent products as the ligands bonded to the gold(I) center change. We tackled this essential question by uncovering an intriguing transmetalation mechanism that takes place between gold(I) and gold(III) complexes. We found that the ease of transmetalation is governed by the nucleophilicity of the gold(I) complex, [(aryl)Au(PR3 )], with greater nucleophilicity leading to a lower activation energy barrier. Remarkably, transmetalation is mainly controlled by a single orbital - the gold dx 2 -y 2 orbital. This orbital also has a profound influence on the reactivity of the oxidative addition step. In this way, the fundamental mechanistic basis of divergent outcomes in reactions of aryl gold(I) complexes with PhICl2 was established and these observations are reconciled from first principles. The theoretical model developed in this study provides a conceptual framework for anticipating the outcomes of reactions involving [(aryl)Au(PR3 )] with PhICl2 , thereby establishing a solid foundation for further advancements in this field.
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Affiliation(s)
- Farshad Shiri
- Department of Chemistry, Islamic Azad University, Central Tehran Branch, Poonak, Tehran, Iran
| | - Curtis C Ho
- School of Natural Sciences - Chemistry, University of Tasmania, Hobart, Tasmania, 7001, Australia
| | - Alex C Bissember
- School of Natural Sciences - Chemistry, University of Tasmania, Hobart, Tasmania, 7001, Australia
| | - Alireza Ariafard
- Research School of Chemistry, Australian National University, Canberra, ACT, 2601, Australia
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Liu Z, Meng X, Zhang Z, Liu R, Wang S, Lei JQ. Theoretical Study on Spectrum and Luminescence Mechanism of Cy5.5 and Cy7.5 Dye Based on Density Functional Theory (DFT). J Fluoresc 2023:10.1007/s10895-023-03525-4. [PMID: 38051402 DOI: 10.1007/s10895-023-03525-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Accepted: 11/24/2023] [Indexed: 12/07/2023]
Abstract
Cy5.5 and 7.5 are the most commonly used NIR 2-region fluoresceins, which have good luminescence properties and important biomedical tracer applications. In this paper, their molecular non-covalent interactions, UV-Vis absorption spectra, main bond lengths, electrostatic potential distributions, frontier molecular orbitals (HOMO and LUMO) and energy gaps were calculated by density functional theory (DFT). We found that the differences in the luminescence properties and energy gaps of Cy5.5 and Cy7.5 molecules may be caused by the length of the conjugated chains between the two aromatic rings in the molecule. By calculating the relevant molecular characteristics, this paper can provide ideas and theoretical basis for the relevant modification and application, as well as the development of new fluorescent dyes.
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Affiliation(s)
- Zhao Liu
- First Hospital of Lanzhou University, Lanzhou University, 222 South Tianshui Road, Lanzhou, 730000, P. R. China
| | - Xv Meng
- First Hospital of Lanzhou University, Lanzhou University, 222 South Tianshui Road, Lanzhou, 730000, P. R. China
| | - Zhengze Zhang
- Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Runzhang Liu
- First Hospital of Lanzhou University, Lanzhou University, 222 South Tianshui Road, Lanzhou, 730000, P. R. China
| | - Shutao Wang
- College of Chemistry and Chemical Engineering, Lanzhou University, 222 South Tianshui Road, Lanzhou, 730000, P. R. China
| | - Jun-Qiang Lei
- First Hospital of Lanzhou University, Lanzhou University, 222 South Tianshui Road, Lanzhou, 730000, P. R. China.
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Yang M, Jiao Y, Sun L, Miao J, Song X, Yin M, Yan L, Sun N. The performance and mechanism of tetracycline and ammonium removal by Pseudomonas sp. DX-21. Bioresour Technol 2023; 386:129484. [PMID: 37442397 DOI: 10.1016/j.biortech.2023.129484] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2023] [Revised: 07/05/2023] [Accepted: 07/10/2023] [Indexed: 07/15/2023]
Abstract
To remove ammonium and tetracycline (TC) from wastewater, a new strain, DX-21, was isolated and exhibited simultaneous removal ability. The performance of DX-21 in TC removal, its removal mechanism, and the potential toxicities of the degradation products were investigated with genomics, mass spectrometry, density functional theory calculations, quantitative structure-activity relationship analyses, and Escherichia coli exposure experiments. DX-21 exhibited removal of ammonium (9.64 mg·L-1·h-1) via assimilation, and TC removal (0.85 mg·L-1·h-1) primarily occurred through cell surface bio-adsorption and biodegradation. Among the 12 identified degradation products, the majority exhibited lower toxicities than TC. Moreover, potential degradation pathways were proposed, including hydroxylation and deamination. Furthermore, DX-21 possessed TC resistance genes, various oxygenases and peroxidases that could potentially contribute to TC degradation. DX-21 colonized activated sludge and significantly enhanced the biodegradation of TC. Therefore, DX-21 showed potential for treating wastewater containing both ammonium and TC.
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Affiliation(s)
- Mengya Yang
- College of Resource and Environment, Northeast Agricultural University, Harbin 150030, China
| | - Yue Jiao
- College of Resource and Environment, Northeast Agricultural University, Harbin 150030, China
| | - Luoting Sun
- College of Resource and Environment, Northeast Agricultural University, Harbin 150030, China
| | - Jingwen Miao
- College of Resource and Environment, Northeast Agricultural University, Harbin 150030, China
| | - Xu Song
- College of Resource and Environment, Northeast Agricultural University, Harbin 150030, China
| | - Mingyue Yin
- College of Resource and Environment, Northeast Agricultural University, Harbin 150030, China
| | - Lilong Yan
- College of Resource and Environment, Northeast Agricultural University, Harbin 150030, China.
| | - Nan Sun
- College of Water Conservancy and Civil Engineering, Northeast Agricultural University, Harbin 150030, China
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Yu M, Takahashi F, Huang Y, Li Z, Xu H, Yang P, Zhu Z, Dong L, Fan C, Yoshikawa K. Insight into the role of SO 2 on selenium conversion during adsorption by CaO: Theoretical calculation and experimental study. J Hazard Mater 2023; 457:131742. [PMID: 37320897 DOI: 10.1016/j.jhazmat.2023.131742] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 05/17/2023] [Accepted: 05/29/2023] [Indexed: 06/17/2023]
Abstract
SO2 can noticeably impact the control of high toxic selenium emissions from flue gas by CaO. Surprisingly, our experiments showed that under certain conditions, SO2 can promote selenium capture by CaO, rather than hinder it. To elucidate the underlying mechanism, a combination of theoretical calculations and experiments was conducted. Thermodynamic equilibrium analysis revealed that gaseous SO2 and solid Ca-S reaction products can promote SeO2 converting to SeO/Se0. The Ca-S products facilitated greater SeO2 conversion compared to SO2. Experimental results demonstrated that selenium adsorption capacity of incompletely sulfurized CaO (CaO with pre-adsorbed SO2) was higher than that of completely sulfurized CaO (Ca-S products), highlighting the importance of adsorption sites of CaO. Density functional theory calculations showed that the pre-adsorbed SO2 hardly affected selenium adsorption energy on the SO2/CaO surface, while completely sulfurized CaO had low selenium adsorption energy, explaining the experimental phenomenon and proving necessary of CaO. Additionally, SeO/Se0 had higher adsorption energy on CaO than SeO2. Overall, the promotion of SO2 on selenium adsorption was primarily affected by two factors: 1) sulfur facilitating SeO2 conversion to SeO/Se0 which can be adsorbed more easily by CaO; 2) sufficient adsorption sites on CaO surface existing for SeO/Se0 adsorption, despite co-adsorption with sulfur.
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Affiliation(s)
- Mengzhu Yu
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu 210096, PR China; Department of Transdisciplinary Science and Engineering, School of Environment and Society, Tokyo Institute of Technology, Kanagawa, Yokohama 2268503, Japan
| | - Fumitake Takahashi
- Department of Transdisciplinary Science and Engineering, School of Environment and Society, Tokyo Institute of Technology, Kanagawa, Yokohama 2268503, Japan
| | - Yaji Huang
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu 210096, PR China.
| | - Zihong Li
- School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning 116024, PR China
| | - Hao Xu
- Department of Transdisciplinary Science and Engineering, School of Environment and Society, Tokyo Institute of Technology, Kanagawa, Yokohama 2268503, Japan
| | - Pu Yang
- Department of Transdisciplinary Science and Engineering, School of Environment and Society, Tokyo Institute of Technology, Kanagawa, Yokohama 2268503, Japan
| | - Zhicheng Zhu
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu 210096, PR China
| | - Lu Dong
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, PR China
| | - Conghui Fan
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu 210096, PR China
| | - Kunio Yoshikawa
- Department of Transdisciplinary Science and Engineering, School of Environment and Society, Tokyo Institute of Technology, Kanagawa, Yokohama 2268503, Japan
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Staś M, Najgebauer P, Siodłak D. Imidazole-amino acids. Conformational switch under tautomer and pH change. Amino Acids 2023; 55:33-49. [PMID: 36319875 DOI: 10.1007/s00726-022-03201-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Accepted: 08/16/2022] [Indexed: 01/26/2023]
Abstract
Replacement of the main chain peptide bond by imidazole ring seems to be a promising tool for the peptide-based drug design, due to the specific prototropic tautomeric as well as amphoteric properties. In this study, we present that both tautomer and pH change can cause a conformational switch of the studied residues of alanine (1-4) and dehydroalanine (5-8) with the C-terminal peptide group replaced by imidazole. The DFT methods are applied and an environment of increasing polarity is simulated. The conformational maps (Ramachandram diagrams) are presented and the stability of possible conformations is discussed. The neutral forms, tautomers τ (1) and π (2), adapt the conformations αRτ (φ, ψ = - 75°, - 114°) and C7eq (φ, ψ = - 75°, 66°), respectively. Their torsion angles ψ differ by about 180°, which results in a considerable impact on the peptide chain conformation. The cation form (3) adapts both these conformations, whereas the anion analogue (4) prefers the conformations C5 (φ, ψ = - 165°, - 178°) and β2 (φ, ψ ~ - 165°, - 3°). Dehydroamino acid analogues, the tautomers τ (5) and π (6) as well as the anion form (8), have a strong tendency toward the conformations β2 (φ, ψ = - 179°, 0°) and C5 (φ, ψ = - 180°, 180°). The preferences of the protonated imidazolium form (7) depend on the environment. The imidazole ring, acting as a donor or acceptor of the hydrogen bonds created within the studied residues, has a profound effect on the type of conformation.
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Fatima S, Mansha A, Asim S. Computational Studies Followed by Effect of Solvent Polarity and Salts on HOMO-LUMO Gap of 7-Hydroxy Coumarine Notabally Reflected by Absorption and Emission Spectra. J Fluoresc 2022; 32:2351-2362. [PMID: 36171504 DOI: 10.1007/s10895-022-03031-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Accepted: 09/14/2022] [Indexed: 11/26/2022]
Abstract
7-Hydroxycoumarin's FT-IR solid phase spectra were observed at 4000-400 cm-1. The spectra were analyzed in aspects of significant approaches. DFT was used to optimize the structure of the compound and its structural properties. The molecular properties were also determined by the HF/3-21G level. The bond lengths and bond angles were obtained by the computational study of the optimized geometry. The vibrational frequencies were determined in all these approaches, which were then matched to experimental frequencies, yielding an excellent agreement between measured and estimated frequency ranges. The UV-visible spectrum of 7HC was obtained and the electronic characteristics HOMO and LUMO energies were monitored by the time-dependent TD-DFT method. The spectral behavior of 7-Hydroxycoumarin was studied using fluorescence spectroscopy in a wide range of polar and non-polar solvents. Solvatochromic effect was observed in both the fluorescence and absorption spectra. The structural properties, energies, IR intensities, absorption wavelengths, and harmonic vibrational frequencies were compared with the obtainable experimental information of the molecule.
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Affiliation(s)
- Sana Fatima
- Department of Chemistry, Government College Women University, Faisalabad, Pakistan
| | - Asim Mansha
- Department of Chemistry, Government College University, Faisalabad, Pakistan
| | - Sadia Asim
- Department of Chemistry, Government College Women University, Faisalabad, Pakistan.
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Jain AK, Gupta A, Karthikeyan C, Trivedi P, Konar AD. Substituent Orchestration in Dimethylquinoxaline Derivatives: A Tool for Fishing Out Appropriate CDK5 Inhibitors as Potential Therapeutics for Alzheimer's. Chem Biodivers 2022; 19:e202200116. [PMID: 35983935 DOI: 10.1002/cbdv.202200116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Accepted: 07/12/2022] [Indexed: 11/12/2022]
Abstract
A set of new heterocyclic analogs (Compounds I-IX), comprising of 6,7 dimethyl Quinoxalines were found to be active against the receptor GSK3β (Compounds IV-V) (Chem. Biodiversity 2021, 18, e2100364). In an effort to modulate effective CDK5 inhibitors herein our hypothesis underpinned to fish out an appropriate derivative from the same quinoxaline series, as these two targets GSK3β and CDK5 shared structural resemblance with each other. Aligned to the goal we have synthesized Compounds I-IX, characterized them using a combination of spectroscopic techniques and evaluated their activities against CDK5. Our analysis reflected that the adjacently located alkoxy/hydroxy functionality derivatives namely Compounds III and VI, to be the most potent (micromolar) amongst others in the series, backed by Density Functional Theory (DFT) calculations and molecular modelling studies. Also, the efficacy of the Compounds I-IX, were monitored in few other members of the CMGC family namely DYRK1A, CLK1and CK1δ that have been known to be directly involved in hyperphosphorylation of Tau. But unfortunately in none of the targets, our quinoxaline series were active. In a nut shell further optimisation of these intelligent nucleus, would not only lead to the discovery of novel pharmacophores, but also marked selectivity against a pool of kinases, thereby implementing a distinct roadmap towards the design of potential therapeutics against Alzheimer's.
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Affiliation(s)
- Arvind Kumar Jain
- School of Pharmaceutical Sciences, Rajiv Gandhi Technological University, Bhopal, 462033, Madhya Pradesh, India
| | - Arindam Gupta
- Department of Chemistry, IISER Bhopal, Bhopal, 462066, Madhya Pradesh, India
| | - C Karthikeyan
- Department of Pharmacy, Indira Gandhi National Tribal University, Amarkantak (MP), 484887, India
| | - Piyush Trivedi
- School of Pharmaceutical Sciences, Rajiv Gandhi Technological University, Bhopal, 462033, Madhya Pradesh, India.,Center of Innovation & Translational Research, Bharati Vidyapeeth, Pune, 411038, Maharashtra, India
| | - Anita Dutt Konar
- School of Pharmaceutical Sciences, Rajiv Gandhi Technological University, Bhopal, 462033, Madhya Pradesh, India.,Dept. of Chemistry, Rajiv Gandhi Technological University, Bhopal, 462033, Madhya Pradesh, India.,University Grants Commission, New Delhi, 110002, New Delhi, India
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Rosa IA, Gonçalves MA, Krambrock KWH, Dos Santos MH, Braga LS, da Cunha EFF, Ramalho TC. Exploring electronic, structural and dynamics parameters of phenylbenzothiazole complexes with Mn 2+, Cu 2+ and Zn 2+ for designing new magnetic resonance imaging (MRI) probes: congruence between computation and spectroscopic data. J Biomol Struct Dyn 2022; 41:3234-3244. [PMID: 35249451 DOI: 10.1080/07391102.2022.2046639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Cancer is one of the leading causes of human death worldwide, being one of the most serious problems faced by mankind. For the diagnosis, Magnetic Resonance Imaging (MRI), through effective contrast agents (Cas), has greatly helped in the diagnosis at the initial stages. However, it is necessary to include new compounds more effective and selective for cancer diagnosis. The complexes with Mn2+, Cu2+ and Zn2+ have received great attention due to their applications as CAs for MRI. Those materials can shorten the T2 and T2* transverse relaxation times. Thus, the representative structures for hyperfine coupling constants (HFCCs) were selected from docking results by frequency of occupancy calculations. From the Multivariate Analysis to obtain the PCA graphs in the choice of a representative conformations. it is possible to notice that the variable energy does not present a high correlation with the other variables, and structural factors, such as the spatial positions of the metal atoms, seem to be important in the reactivity of the complexes. Structural factors, such as the spatial positions of the metal atoms, seem to be important in the reactivity of the complexes. Theoretical findings suggest that the compounds are capable of increasing the Aiso values of the water molecules, but the complex [Zn(H2O)(NNO)] shows a greater influence, being more sensitive to the Electron paramagnetic resonance parameters than the complexes [CuCl(H2O)NNO] and [MnCl2(H2O)(NNO)] with the explicit solvent and the enzyme. MRI contrast agents have generated various problems due to their high toxicity. In this perspective, this compound may be a promising alternative for transporting the CAs into diseased tissue.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
| | | | | | | | - Letícia S Braga
- Department of Chemistry, Federal University of Lavras, Lavras, Brazil
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Malinowski S, Wróbel M, Woszuk A. Quantum Chemical Analysis of the Corrosion Inhibition Potential by Aliphatic Amines. Materials (Basel) 2021; 14:6197. [PMID: 34683789 PMCID: PMC8541296 DOI: 10.3390/ma14206197] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 10/07/2021] [Accepted: 10/14/2021] [Indexed: 11/16/2022]
Abstract
Destructive corrosion processes lead to the loss of primary mechanical properties of metal construction materials, which generates additional costs during their maintenance connected with repairs and protection. The effectiveness of corrosion inhibitors can be determined by using many methods, in particular quantum chemical modeling. The subject of the theoretical analyses presented in this work involves the anticorrosion properties of amines with various chemical structures. Evaluation of the corrosion inhibition properties of selected amines was performed on the basis of the HOMO-LUMO energy gap, dipole moment (µ), electronegativity (χ) determined as a result of the energy of the highest occupied molecular orbital (HOMO) and the energy of the lowest unoccupied molecular orbital (LUMO). Moreover, the HSAB (Hard and Soft Acids and Bases) theory was used to explain the reactivity of the analyzed amines, while the Mulliken population analysis was used to determine their electrostatic interactions with the surface of protected metal. The obtained results indicate that the protonation reaction of aliphatic amines leads to a change in the nature of the formation of a coordination bond with the surface of the protected metal. In turn, the quantum chemical calculations showed that the protonation reaction of aliphatic amines leads to a decrease in their corrosion inhibition efficiency. Most of the analyzed parameters indicated that tertiary amines are characterized by the highest corrosion inhibition efficiency.
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Affiliation(s)
- Szymon Malinowski
- Department of Building Materials Engineering and Geoengineering, Faculty of Civil Engineering and Architecture, Lublin University of Technology, Nadbystrzycka 40, 20-618 Lublin, Poland; (M.W.); (A.W.)
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15
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Zhang H, Du W, Zhang J, Ahuja R, Qian Z. Nitrogen-Containing Gas Sensing Properties of 2-D Ti 2N and Its Derivative Nanosheets: Electronic Structures Insight. Nanomaterials (Basel) 2021; 11:2459. [PMID: 34578775 PMCID: PMC8468527 DOI: 10.3390/nano11092459] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Revised: 09/08/2021] [Accepted: 09/14/2021] [Indexed: 12/28/2022]
Abstract
In this work, the potentials of two-dimensional Ti2N and its derivative nanosheets Ti2NT2(T=O, F, OH) for some harmful nitrogen-containing gas (NCG) adsorption and sensing applications have been unveiled based on the quantum-mechanical Density Functional Theory calculations. It is found that the interactions between pure Ti2N and NCGs (including NO, NO2, and NH3 in this study) are very strong, in which NO and NO2 can even be dissociated, and this would poison the substrate of Ti2N monolayer and affect the stability of the sensing material. For the monolayer of Ti2NT2(T=O, F, OH) that is terminated by functional groups on surface, the adsorption energies of NCGs are greatly reduced, and a large amount of charges are transferred to the functional group, which is beneficial to the reversibility of the sensing material. The significant changes in work function imply the good sensitivity of the above mentioned materials. In addition, the fast response time further consolidates the prospect of two-dimensional Ti2NT2 as efficient NCGs' sensing materials. This theoretical study would supply physical insight into the NCGs' sensing mechanism of Ti2N based nanosheets and help experimentalists to design better 2-D materials for gas adsorption or sensing applications.
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Affiliation(s)
- Hongni Zhang
- Key Laboratory of Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan 250061, China; (H.Z.); (W.D.); (J.Z.)
- College of Industry and Commerce, Shandong Management University, Jinan 250357, China
| | - Wenzheng Du
- Key Laboratory of Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan 250061, China; (H.Z.); (W.D.); (J.Z.)
| | - Jianjun Zhang
- Key Laboratory of Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan 250061, China; (H.Z.); (W.D.); (J.Z.)
| | - Rajeev Ahuja
- Condensed Matter Theory, Department of Physics and Astronomy, Ångström Laboratory, Uppsala University, 75120 Uppsala, Sweden;
- Department of Materials Science and Engineering, KTH Royal Institute of Technology, 10044 Stockholm, Sweden
| | - Zhao Qian
- Key Laboratory of Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan 250061, China; (H.Z.); (W.D.); (J.Z.)
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Lian L, Jiang B, Xing Y, Zhang N. Identification of photodegradation product of organophosphorus pesticides and elucidation of transformation mechanism under simulated sunlight irradiation. Ecotoxicol Environ Saf 2021; 224:112655. [PMID: 34418856 DOI: 10.1016/j.ecoenv.2021.112655] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Revised: 08/03/2021] [Accepted: 08/13/2021] [Indexed: 06/13/2023]
Abstract
Organophosphorus pesticides (OPs) are posing great threat to the environment and human health, due to their overuse and persistence in the environment. Photolysis has been established as an effective method to degrade OPs. The influence of pH value, the initial concentration of pesticides and the light source on the photolysis of two OPs, including chlorpyrifos and dimethoate, was investigated. The optimal reaction condition for OPs degradation was under pH 9, with xenon lamp as the light source, in which the photodegradation efficiencies of chlorpyrifos and dimethoate (500 mg/L) were 75.12% and 94.31%, respectively. The photodegradation products of chlorpyrifos and dimethoate were identified by GC-MS. Also, density functional theory (DFT) calculations were used to characterize the molecular properties of chlorpyrifos and dimethoate, as well as predicting potential photolysis reactions. Photodegradation mechanisms of chlorpyrifos and dimethoate were proposed, in which 3,5,6-trichloropyridinol (TCP), O,O-diethyl thiophosphate (DETP), 2,3,5-Trichloro-6-methoxypyridine (TMP) and O,O,S-trimethyl phosphorothioate were identified as the main products of chlorpyrifos degradation. Omethoate, O,O,S-trimethyl thiophosphorothioate, N-methyl-2-sulfanylacetamide, O,O,O-trimethyl thiophosphate, O,O,S-trimethylphosphorothiate, and O,O,O-trimethyl phosphoric ester as the main photodegradation products for dimethoate. The main degradation mechanisms included ring opening, cleavage, oxidation and demethylation. This work demonstrated the feasibility of combining chemical analysis with quantum chemical calculation in unraveling degradation mechanisms of OPs. Also, it is of great significance for evaluating the environmental fate of OPs in aquatic system and further environmental risk assessment.
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Affiliation(s)
- Luning Lian
- School of Energy and Environmental Engineering, University of Science & Technology Beijing, Beijing 100083, PR China; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, University of Science & Technology Beijing, Beijing 100083, PR China; National Environmental and Energy Science and Technology International Cooperation Base, University of Science & Technology Beijing, Beijing 100083, PR China
| | - Bo Jiang
- School of Energy and Environmental Engineering, University of Science & Technology Beijing, Beijing 100083, PR China; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, University of Science & Technology Beijing, Beijing 100083, PR China; National Environmental and Energy Science and Technology International Cooperation Base, University of Science & Technology Beijing, Beijing 100083, PR China; School of Environment, Tsinghua University, Beijing 100084, PR China; National Engineering Laboratory for Site Remediation Technologies, Beijing 100015, PR China.
| | - Yi Xing
- School of Energy and Environmental Engineering, University of Science & Technology Beijing, Beijing 100083, PR China; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, University of Science & Technology Beijing, Beijing 100083, PR China; National Environmental and Energy Science and Technology International Cooperation Base, University of Science & Technology Beijing, Beijing 100083, PR China.
| | - Nana Zhang
- School of Energy and Environmental Engineering, University of Science & Technology Beijing, Beijing 100083, PR China; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, University of Science & Technology Beijing, Beijing 100083, PR China; National Environmental and Energy Science and Technology International Cooperation Base, University of Science & Technology Beijing, Beijing 100083, PR China
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Uppa Y, Taweetanavanich T, Kaewtong C, Niamsa N. Immobilization of unmodified aminoanthraquinone derivatives onto silica gel surface for solid-phase extraction and pre-concentration of Pb(II). Environ Technol 2021; 42:1252-1259. [PMID: 31482766 DOI: 10.1080/09593330.2019.1663937] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Accepted: 08/29/2019] [Indexed: 06/10/2023]
Abstract
In this project, silica gel chemically bonded with derivatives of aminoanthraquinone were synthesized and characterized. Adsorbents 1,8-aminoanthraquinone-3-aminopropylsilica (SL1), 2-aminoanthraquinone-3-aminopropylsilica (SL2) and 1-aminoanthraquinone-3-aminopropylsilica (SL3) were produced and tested to adsorb heavy metal solutions including Pb(II) Cu(II) Zn(II) Cd(II) and Co(II). The concentrations of the adsorbed heavy metals solution were calculated by atomic adsorption spectrophotometry employing a batch method. The results showed that speed at 200 rpm for 30 min with pH 9 is the optimum condition for heavy metal adsorption. The result also indicated that adsorbent SL3 is the best adsorbent for Pb(II) at 82.5%, and the relative standard deviation (R.S.D.) was lower than 6%. The method detection limit was 1.1 µg L-1 for Pb2+. In addition, Density Functional Theory (DFT) calculation results suggested that the adsorbent sensor formed stable complexes with Pb(II) through a large number of cation-dipole interactions. The method was also applied with satisfactory results to the pre-concentration of trace Pb(II) in environmental samples.
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Affiliation(s)
- Yuwapon Uppa
- Department of Chemistry, Faculty of Engineering, Rajamangala University of Technology Isan, Khonkaen, Thailand
| | - Thianthan Taweetanavanich
- Nanotechnology Research Unit and Supramolecular Chemistry Research Unit, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Mahasarakham University, Mahasarakham, Thailand
| | - Chatthai Kaewtong
- Nanotechnology Research Unit and Supramolecular Chemistry Research Unit, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Mahasarakham University, Mahasarakham, Thailand
| | - Noi Niamsa
- Nanotechnology Research Unit and Supramolecular Chemistry Research Unit, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Mahasarakham University, Mahasarakham, Thailand
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Lee JH, Jo DY, Choung JW, Kim CH, Ham HC, Lee KY. Roles of noble metals (M = Ag, Au, Pd, Pt and Rh) on CeO 2 in enhancing activity toward soot oxidation: Active oxygen species and DFT calculations. J Hazard Mater 2021; 403:124085. [PMID: 33265065 DOI: 10.1016/j.jhazmat.2020.124085] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 09/18/2020] [Accepted: 09/21/2020] [Indexed: 06/12/2023]
Abstract
The effects of noble metal (M = Ag, Au, Pd, Pt, and Rh) on CeO2 in enhancing the activity toward soot oxidation were studied through experimental methods and density functional theory (DFT) calculations. Each noble metal (3 mol.%) was supported on CeO2 (M/CeO2) and the properties of the catalysts were verified by XRD, HRTEM, N2 physisorption, CO chemisorption, XPS, and H2-TPR results. The noble metal was highly dispersed over CeO2, except for Au due to the sintering of Au, and the reducibility of the catalysts was greatly improved according to degree of the interaction between each noble metal and CeO2. The activities of M/CeO2 catalysts for soot oxidation were better than that of CeO2, and followed the order Rh/CeO2 > Ag/CeO2 > Pt/CeO2 > Au/CeO2 > Pd/CeO2 > CeO2. Moreover, our DFT calculations showed that vacancy formation energy was gradually lowered in the following order: CeO2 > Pd4/CeO2 > Pt4/CeO2 > Au4/CeO2 = Ag4/CeO2 > Rh4/CeO2, which was similar order with experimental activity. In addition, the electronic states of the p and f orbitals of CeO2 were studied to compare with the occupied Ce 4f electrons, which affect the redox property. Rh/CeO2 and Ag/CeO2 showed the improved soot oxidation activity, with an enhanced ability to generate oxygen vacancy formation and oxygen adsorption and increased electron transfer. Consequently, the experimental and DFT calculation results revealed the roles of noble metals on ceria with respect to catalytic activity.
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Affiliation(s)
- Jae Hwan Lee
- Department of Chemical and Biological Engineering, Korea University, 145, Anam-Ro, Seongbuk-Gu, Seoul 02841, Republic of Korea
| | - Deok Yeon Jo
- Department of Chemical and Biological Engineering, Korea University, 145, Anam-Ro, Seongbuk-Gu, Seoul 02841, Republic of Korea
| | - Jin Woo Choung
- Advanced Catalysts and Emission-Control Research Lab, Research & Development Division, Hyundai Motor Group, Hyundaiyeonguso-Ro, Namyang-Eup, Hwaseong-Si, Gyeonggi-Do 18280, Republic of Korea
| | - Chang Hwan Kim
- Advanced Catalysts and Emission-Control Research Lab, Research & Development Division, Hyundai Motor Group, Hyundaiyeonguso-Ro, Namyang-Eup, Hwaseong-Si, Gyeonggi-Do 18280, Republic of Korea
| | - Hyung Chul Ham
- Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Inha-ro, Michuhol-gu, Incheon 22212, Republic of Korea.
| | - Kwan-Young Lee
- Department of Chemical and Biological Engineering, Korea University, 145, Anam-Ro, Seongbuk-Gu, Seoul 02841, Republic of Korea; Super Ultra Low Energy and Emission Vehicle (SULEEV) Center, Korea University, 145, Anam-Ro, Seongbuk-Gu, Seoul 02841, Republic of Korea.
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Sekar PC, Paul DM, Srinivasan E, Rajasekaran R. Unravelling the molecular effect of ocellatin-1, F1, K1 and S1, the frog-skin antimicrobial peptides to enhance its therapeutics-quantum and molecular mechanical approaches. J Mol Model 2021; 27:10. [PMID: 33392722 DOI: 10.1007/s00894-020-04652-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Accepted: 12/16/2020] [Indexed: 01/09/2023]
Abstract
Ocellatin AMPs (antimicrobial peptides) are considered to be promising alternative therapeutics to conventional antibiotics. Three-dimensional (3D) structures of ocellatin-F1 with 25 residues have been reported to be potent in terms of bacterial membrane permeability. To investigate the influence of similar ocellatin peptides with 25 residues pertaining to antimicrobial effect, ocellatin-1, K1 and S1 peptides were modelled with ocellatin-F1 as template. Comparative analyses between these peptides were carried out, using computational approaches. From the results of in silico toxicity profile, all peptides were found to be non-toxic with no haemolytic activity. Further sequence analysis, net charge, hydrophobicity and hydrophobic moment revealed the membrane permeable efficacy of ocellatin-1 peptide. Besides, the investigation of peptide electronic structures through density functional theory and quantum chemical (HOMO and LUMO) calculations predicted ocellatin-1 to be a suitable peptide, which can be used as a scaffold for therapeutics. Furthermore, the determination of structural contours such as RMSD, RMSF and Rg through trajectory analysis revealed that ocellatin-1 exhibited strong structural stability. In addition, the trajectory analysis of elements of secondary structure illustrated the alpha helical conformations to be retained in all peptides, except ocellatin-1. On the aforementioned grounds, ocellatin-1 was found to possess the important role of peptide penetration of the bacterial membrane. This study becomes significant, since it is the first time where the structural importance of ocellatin peptides were explored in detail and the therapeutic potential of ocellatin-1 as a peptide-based antimicrobial drug have been theoretically revealed.
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Affiliation(s)
- P Chandra Sekar
- Bioinformatics Lab, Department of Biotechnology, School of BioSciences and Technology, Vellore Institute of Technology (Deemed to be University), Vellore, Tamil Nadu, India
| | - D Meshach Paul
- Bioinformatics Lab, Department of Biotechnology, School of BioSciences and Technology, Vellore Institute of Technology (Deemed to be University), Vellore, Tamil Nadu, India
| | - E Srinivasan
- Bioinformatics Lab, Department of Biotechnology, School of BioSciences and Technology, Vellore Institute of Technology (Deemed to be University), Vellore, Tamil Nadu, India
| | - R Rajasekaran
- Bioinformatics Lab, Department of Biotechnology, School of BioSciences and Technology, Vellore Institute of Technology (Deemed to be University), Vellore, Tamil Nadu, India.
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Carlotto S, Sambi M, Sedona F, Vittadini A, Casarin M. A Theoretical Study of the Occupied and Unoccupied Electronic Structure of High- and Intermediate-Spin Transition Metal Phthalocyaninato (Pc) Complexes: VPc, CrPc, MnPc, and FePc. Nanomaterials (Basel) 2020; 11:nano11010054. [PMID: 33379291 PMCID: PMC7824030 DOI: 10.3390/nano11010054] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 12/18/2020] [Accepted: 12/22/2020] [Indexed: 11/16/2022]
Abstract
The structural, electronic, and spectroscopic properties of high- and intermediate-spin transition metal phthalocyaninato complexes (MPc; M = V, Cr, Mn and Fe) have been theoretically investigated to look into the origin, symmetry and strength of the M–Pc bonding. DFT calculations coupled to the Ziegler’s extended transition state method and to an advanced charge density and bond order analysis allowed us to assess that the M–Pc bonding is dominated by σ interactions, with FePc having the strongest and most covalent M–Pc bond. According to experimental evidence, the lightest MPcs (VPc and CrPc) have a high-spin ground state (GS), while the MnPc and FePc GS spin is intermediate. Insights into the MPc unoccupied electronic structure have been gained by modelling M L2,3-edges X-ray absorption spectroscopy data from the literature through the exploitation of the current Density Functional Theory variant of the Restricted Open-Shell Configuration Interaction Singles (DFT/ROCIS) method. Besides the overall agreement between theory and experiment, the DFT/ROCIS results indicate that spectral features lying at the lowest excitation energies (EEs) are systematically generated by electronic states having the same GS spin multiplicity and involving M-based single electronic excitations; just as systematically, the L3-edge higher EE region of all the MPcs herein considered includes electronic states generated by metal-to-ligand-charge-transfer transitions involving the lowest-lying π* orbital (7eg) of the phthalocyaninato ligand.
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Affiliation(s)
- Silvia Carlotto
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, via F. Marzolo 1, 35131 Padova, Italy; (M.S.); (F.S.)
- Istituto di Chimica della Materia Condensata e di Tecnologie per l’Energia (ICMATE-CNR), via F. Marzolo 1, 35131 Padova, Italy;
- Correspondence: (S.C.); (M.C.)
| | - Mauro Sambi
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, via F. Marzolo 1, 35131 Padova, Italy; (M.S.); (F.S.)
| | - Francesco Sedona
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, via F. Marzolo 1, 35131 Padova, Italy; (M.S.); (F.S.)
| | - Andrea Vittadini
- Istituto di Chimica della Materia Condensata e di Tecnologie per l’Energia (ICMATE-CNR), via F. Marzolo 1, 35131 Padova, Italy;
| | - Maurizio Casarin
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, via F. Marzolo 1, 35131 Padova, Italy; (M.S.); (F.S.)
- Istituto di Chimica della Materia Condensata e di Tecnologie per l’Energia (ICMATE-CNR), via F. Marzolo 1, 35131 Padova, Italy;
- Correspondence: (S.C.); (M.C.)
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Liu X, Fan X, Huang H, HaipingLin, Gao J. Electronic modulation of oxygen evolution on metal doped NiFe layered double hydroxides. J Colloid Interface Sci 2021; 587:385-92. [PMID: 33360908 DOI: 10.1016/j.jcis.2020.12.023] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2020] [Revised: 12/07/2020] [Accepted: 12/08/2020] [Indexed: 11/23/2022]
Abstract
The bottleneck of electrochemical water splitting is the sluggish kinetics of oxygen evolution reaction (OER). Layered double hydroxides (LDHs) have been proposed as active and affordable electrocatalysts in OER. It has been reported that the activity of LDHs can be effectively tuned by doping of other metals. Despite previous experimental synthesis and improved catalytic performance, the in-depth OER mechanism on metal doped LDHs remains ambiguous. In the present work, transition metals (Cr, Mn and Co) doped NiFe LDHs were designed to investigate the doping effect in OER by both experimental analysis and density functional theory calculations. Based on experimental results, the intrinsic OER activity is Cr-NiFe LDHs > Co-NiFe LDHs > Mn-NiFe LDHs > NiFe LDHs, while the enhanced catalytic performance upon doping can be attributed to the interface effect, which results in the tuning of the binding energies of the intermediate states in OER.
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Mazurek AH, Szeleszczuk Ł, Simonson T, Pisklak DM. Application of Various Molecular Modelling Methods in the Study of Estrogens and Xenoestrogens. Int J Mol Sci 2020; 21:E6411. [PMID: 32899216 PMCID: PMC7504198 DOI: 10.3390/ijms21176411] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Revised: 08/30/2020] [Accepted: 09/01/2020] [Indexed: 12/14/2022] Open
Abstract
In this review, applications of various molecular modelling methods in the study of estrogens and xenoestrogens are summarized. Selected biomolecules that are the most commonly chosen as molecular modelling objects in this field are presented. In most of the reviewed works, ligand docking using solely force field methods was performed, employing various molecular targets involved in metabolism and action of estrogens. Other molecular modelling methods such as molecular dynamics and combined quantum mechanics with molecular mechanics have also been successfully used to predict the properties of estrogens and xenoestrogens. Among published works, a great number also focused on the application of different types of quantitative structure-activity relationship (QSAR) analyses to examine estrogen's structures and activities. Although the interactions between estrogens and xenoestrogens with various proteins are the most commonly studied, other aspects such as penetration of estrogens through lipid bilayers or their ability to adsorb on different materials are also explored using theoretical calculations. Apart from molecular mechanics and statistical methods, quantum mechanics calculations are also employed in the studies of estrogens and xenoestrogens. Their applications include computation of spectroscopic properties, both vibrational and Nuclear Magnetic Resonance (NMR), and also in quantum molecular dynamics simulations and crystal structure prediction. The main aim of this review is to present the great potential and versatility of various molecular modelling methods in the studies on estrogens and xenoestrogens.
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Affiliation(s)
- Anna Helena Mazurek
- Chair and Department of Physical Pharmacy and Bioanalysis, Department of Physical Chemistry, Medical Faculty of Pharmacy, University of Warsaw, Banacha 1 str., 02-093 Warsaw Poland; (A.H.M.); (D.M.P.)
| | - Łukasz Szeleszczuk
- Chair and Department of Physical Pharmacy and Bioanalysis, Department of Physical Chemistry, Medical Faculty of Pharmacy, University of Warsaw, Banacha 1 str., 02-093 Warsaw Poland; (A.H.M.); (D.M.P.)
| | - Thomas Simonson
- Laboratoire de Biochimie (CNRS UMR7654), Ecole Polytechnique, 91-120 Palaiseau, France;
| | - Dariusz Maciej Pisklak
- Chair and Department of Physical Pharmacy and Bioanalysis, Department of Physical Chemistry, Medical Faculty of Pharmacy, University of Warsaw, Banacha 1 str., 02-093 Warsaw Poland; (A.H.M.); (D.M.P.)
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Li C, Li H, Zong HH, Huang Y, Gozin M, Sun CQ, Zhang L. Strategies for Achieving Balance between Detonation Performance and Crystal Stability of High-Energy-Density Materials. iScience 2020; 23:100944. [PMID: 32163898 PMCID: PMC7066234 DOI: 10.1016/j.isci.2020.100944] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Revised: 02/18/2020] [Accepted: 02/21/2020] [Indexed: 01/07/2023] Open
Abstract
Performance-stability contradiction of high-energy-density materials (HEDMs) is a long-standing puzzle in the field of chemistry and material science. Bridging the gap that exists between detonation performance of new HEDMs and their stability remains a formidable challenge. Achieving optimal balance between the two contradictory factors is of a significant demand for deep-well oil and gas drilling, space exploration, and other civil and defense applications. Herein, supercomputers and latest quantitative computational strategies were employed and high-throughput quantum calculations were conducted for 67 reported HEDMs. Based on statistical analysis of large amounts of physico-chemical data, in-crystal interspecies interactions were identified to be the one that provokes the performance-stability contradiction of HEDMs. To design new HEDMs with both good detonation performance and high stability, the proposed systematic and comprehensive strategies must be satisfied, which could promote the development of crystal engineering of HEDMs to an era of theory-guided rational design of materials.
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Affiliation(s)
- Chongyang Li
- Key Laboratory of Low-dimensional Materials and Application Technology (Ministry of Education), School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China; CAEP Software Center for High Performance Numerical Simulation, Beijing 100088, China
| | - Hui Li
- Science and Technology on Combustion and Explosion Laboratory, Xi'an Modern Chemistry Research Institute, Xi'an 710065, China; School of Chemistry, Faculty of Exact Science, Tel Aviv University, Tel Aviv 69978, Israel
| | - He-Hou Zong
- Institute of Chemical Materials, China Academy of EngineeringPhysics (CAEP), Mianyang 621900, China
| | - Yongli Huang
- Key Laboratory of Low-dimensional Materials and Application Technology (Ministry of Education), School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China.
| | - Michael Gozin
- School of Chemistry, Faculty of Exact Science, Tel Aviv University, Tel Aviv 69978, Israel.
| | - Chang Q Sun
- EBEAM, Yangtze Normal University, Chongqing 408100, China; NOVITAS, Nanyang Technological University, Singapore 639798, Singapore.
| | - Lei Zhang
- CAEP Software Center for High Performance Numerical Simulation, Beijing 100088, China; Institute of Applied Physics and Computational Mathematics, Beijing 100088, China.
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Go CY, Jeong GS, Kim KC. Pyrenetetrone Derivatives Tailored by Nitrogen Dopants for High-Potential Cathodes in Lithium-Ion Batteries. iScience 2019; 21:206-216. [PMID: 31671332 PMCID: PMC6834949 DOI: 10.1016/j.isci.2019.10.023] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Revised: 10/01/2019] [Accepted: 10/11/2019] [Indexed: 11/28/2022] Open
Abstract
To overcome limited information on organic cathode materials for lithium-ion batteries, we studied the electrochemical redox properties of pyrenetetrone and its nitrogen-doped derivatives. Three primary conclusions are highlighted from this study. First, the redox potential increases as the number of electron-withdrawing nitrogen dopants increases. Second, the redox potentials of pyrenetetrone derivatives continuously decrease with the number of bound Li atoms during the discharging process owing to the decrease in the reductive ability until the compounds become cathodically deactivated exhibiting negative redox potentials. Notably, pyrenetetrone with four nitrogen dopants loses its cathodic activity after the binding of five Li atoms, indicating remarkably high performance (496 mAh/g and 913 mWh/g). Last, the redox potential is strongly correlated not only with electronic properties but also with solvation energy. This highlights that pyrenetetrone derivatives would follow two-stage transition behaviors during the discharging process, implying a crucial contribution of solvation energy to their cathodic deactivation.
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Affiliation(s)
- Chae Young Go
- Computational Materials Design Laboratory, Division of Chemical Engineering, Konkuk University, Seoul 05029, The Republic of Korea
| | - Gyeong Seok Jeong
- Computational Materials Design Laboratory, Division of Chemical Engineering, Konkuk University, Seoul 05029, The Republic of Korea
| | - Ki Chul Kim
- Computational Materials Design Laboratory, Division of Chemical Engineering, Konkuk University, Seoul 05029, The Republic of Korea.
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25
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Liu M, Wang Y, Kong X, Tan L, Li L, Cheng S, Botton G, Guo H, Mi Z, Li CJ. Efficient Nitrogen Fixation Catalyzed by Gallium Nitride Nanowire Using Nitrogen and Water. iScience 2019; 17:208-216. [PMID: 31288155 PMCID: PMC6614754 DOI: 10.1016/j.isci.2019.06.032] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2018] [Revised: 04/26/2019] [Accepted: 06/23/2019] [Indexed: 11/30/2022] Open
Abstract
Ammonia is one of the most important bulk chemicals in modern society. However, the highly energy-extensive contemporary industrial production of ammonia was developed in the early 20th century and requires extensive heating of highly pressurized flammable hydrogen gas, whose global production still relies heavily on non-sustainable petroleum. The development of “sustainable” nitrogen fixation process represents a grand aspirational chemical pursuit concerning our future human well-being. Herein, we report an ultra-stable nitride-based photosensitizing semiconductor that enables efficient, sustainable, and mild photochemical nitrogen fixation. The catalyst exhibits strong chemisorption of nitrogen and enables immediate electron donation from its surface vacancy to nitrogen. In addition, it was also demonstrated that the nitride-based semiconductor possesses the potential to minimize electron-hole recombination. Efficient photo-N2 fixation Strong chemisorption of N2 Uses water as H source
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Affiliation(s)
- Mingxin Liu
- Department of Chemistry and FRQNT Centre for Green Chemistry and Catalysts, McGill University, 801 Sherbrooke Ouest, Montreal, QC H3A 0B8, Canada; Department of Electrical Engineering and Computer Science, University of Michigan, 1301 Beal Avenue, Ann Arhor, MI 48109, USA
| | - Yichen Wang
- Department of Electrical and Computer Engineering, McGill University, 3480 University, Montreal, QC H3A 0E9, Canada
| | - Xianghua Kong
- Department of Physics, McGill University, Rutherford Building, 3600 University, Montreal, QC H3A 2T8, Canada
| | - Lida Tan
- Department of Chemistry and FRQNT Centre for Green Chemistry and Catalysts, McGill University, 801 Sherbrooke Ouest, Montreal, QC H3A 0B8, Canada
| | - Lu Li
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Chemistry Department, Jilin University, Changchun, China
| | - Shaobo Cheng
- Department of Material Science and Engineering, Canadian Centre for Electron Microscopy, McMaster University, 1280 Main Street West, Hamilton, ON L8S 4M1, Canada
| | - Gianluigi Botton
- Department of Material Science and Engineering, Canadian Centre for Electron Microscopy, McMaster University, 1280 Main Street West, Hamilton, ON L8S 4M1, Canada
| | - Hong Guo
- Department of Physics, McGill University, Rutherford Building, 3600 University, Montreal, QC H3A 2T8, Canada
| | - Zetian Mi
- Department of Electrical Engineering and Computer Science, University of Michigan, 1301 Beal Avenue, Ann Arhor, MI 48109, USA; Department of Electrical and Computer Engineering, McGill University, 3480 University, Montreal, QC H3A 0E9, Canada.
| | - Chao-Jun Li
- Department of Chemistry and FRQNT Centre for Green Chemistry and Catalysts, McGill University, 801 Sherbrooke Ouest, Montreal, QC H3A 0B8, Canada.
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Patra M, Klingler S, Eichenberger LS, Holland JP. Simultaneous Photoradiochemical Labeling of Antibodies for Immuno-Positron Emission Tomography. iScience 2019; 13:416-431. [PMID: 30903963 PMCID: PMC6430723 DOI: 10.1016/j.isci.2019.03.004] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Revised: 01/29/2019] [Accepted: 03/02/2019] [Indexed: 12/04/2022] Open
Abstract
A method for the simultaneous (one-step) photochemical conjugation and 89Zr-radiolabeling of antibodies is introduced. A photoactivatable chelate based on the functionalization of desferrioxamine B with an arylazide moiety (DFO-ArN3, [1]) was synthesized. The radiolabeled complex, 89Zr-1+, was produced and characterized. Density functional theory calculations were used to investigate the mechanism of arylazide photoactivation. 89Zr-radiolabeling experiments were also used to determine the efficiency of photochemical conjugation. A standard two-step approach gave a measured conjugation efficiency of 3.5% ± 0.4%. In contrast, the one-step process gave a higher photoradiolabeling efficiency of ∼76%. Stability measurements, cellular saturation binding assays, positron emission tomographic imaging, and biodistribution studies in mice bearing SK-OV-3 tumors confirmed the biochemical viability and tumor specificity of photoradiolabeled [89Zr]ZrDFO-azepin-trastuzumab. Experimental data support the conclusion that the combination of photochemistry and radiochemistry is a viable strategy for producing radiolabeled proteins for imaging and therapy. Photochemistry is combined with radiochemistry for radiosynthesis in a flash Simultaneous photoradiochemistry is achieved with high radiolabeling efficiency Photoradiochemistry produces viable 89Zr-radiolabeled antibodies Density functional theory calculations elucidate the photoactivation mechanism
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Affiliation(s)
- Malay Patra
- University of Zurich, Department of Chemistry, Winterthurerstrasse 190, Zurich 8057, Switzerland
| | - Simon Klingler
- University of Zurich, Department of Chemistry, Winterthurerstrasse 190, Zurich 8057, Switzerland
| | - Larissa S Eichenberger
- University of Zurich, Department of Chemistry, Winterthurerstrasse 190, Zurich 8057, Switzerland
| | - Jason P Holland
- University of Zurich, Department of Chemistry, Winterthurerstrasse 190, Zurich 8057, Switzerland.
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Fernandes SSM, Aires-de-Sousa J, Belsley M, Raposo MMM. Synthesis of Pyridazine Derivatives by Suzuki-Miyaura Cross-Coupling Reaction and Evaluation of Their Optical and Electronic Properties through Experimental and Theoretical Studies. Molecules 2018; 23:E3014. [PMID: 30453681 DOI: 10.3390/molecules23113014] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Revised: 11/02/2018] [Accepted: 11/11/2018] [Indexed: 01/03/2023] Open
Abstract
A series of π-conjugated molecules, based on pyridazine and thiophene heterocycles 3a–e, were synthesized using commercially, or readily available, coupling components, through a palladium catalyzed Suzuki-Miyaura cross-coupling reaction. The electron-deficient pyridazine heterocycle was functionalized by a thiophene electron-rich heterocycle at position six, and different (hetero)aromatic moieties (phenyl, thienyl, furanyl) were functionalized with electron acceptor groups at position three. Density Functional Theory (DFT) calculations were carried out to obtain information on the conformation, electronic structure, electron distribution, dipolar moment, and molecular nonlinear response of the synthesized push-pull pyridazine derivatives. Hyper-Rayleigh scattering in 1,4-dioxane solutions, using a fundamental wavelength of 1064 nm, was used to evaluate their second-order nonlinear optical properties. The thienylpyridazine functionalized with the cyano-phenyl moiety exhibited the largest first hyperpolarizability (β = 175 × 10−30 esu, using the T convention) indicating its potential as a second harmonic generation (SHG) chromophore.
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Kaur M, Sawhney RS, Engles D. Proliferating miller indices of C 20 fullerene device under DFT-NEGF regime. J Mol Graph Model 2017; 71:184-91. [PMID: 27939930 DOI: 10.1016/j.jmgm.2016.10.017] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2016] [Revised: 10/06/2016] [Accepted: 10/29/2016] [Indexed: 11/22/2022]
Abstract
We present ab-initio scrutiny of electron transport through C20 fullerene cleaved with gold electrodes having unique set of miller orientations. The three families of miller indices {100}, {110} and {111} are considered with four exclusive device models for elucidating electronic transport under applied potential of - 2 to +2V. Thereafter, the quantum calculations employing DFT-NEGF are performed for envisaging density of states, transmission function, energy levels, molecular orbitals, charge transfer. These electronic transfer parameters lead to the study of its two electrical parameters: current and conductance. We conclude that in molecular-devices of constituted miller family {110}, HOMO-LUMO gap are inversely proportional to extent of charge carriers. While for miller devices {100} and {111}, the situation is fully contrasting with HOMO-LUMO gap being directly proportional to its charge carriers. Another important conclusion is that the gold electrodes having miller family {100} and {111} are providing equal opportunity to fullerene molecule to imply its behavior while electrodes of miller family {110} are over shadowing the performance of fullerene molecule.
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Escobedo-González R, Méndez-Albores A, Villarreal-Barajas T, Aceves-Hernández JM, Miranda-Ruvalcaba R, Nicolás-Vázquez I. A Theoretical Study of 8-Chloro-9-Hydroxy-Aflatoxin B₁, the Conversion Product of Aflatoxin B₁ by Neutral Electrolyzed Water. Toxins (Basel) 2016; 8:E225. [PMID: 27455324 PMCID: PMC4963857 DOI: 10.3390/toxins8070225] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2016] [Accepted: 07/14/2016] [Indexed: 01/16/2023] Open
Abstract
Theoretical studies of 8-chloro-9-hydroxy-aflatoxin B₁ (2) were carried out by Density Functional Theory (DFT). This molecule is the reaction product of the treatment of aflatoxin B₁ (1) with hypochlorous acid, from neutral electrolyzed water. Determination of the structural, electronic and spectroscopic properties of the reaction product allowed its theoretical characterization. In order to elucidate the formation process of 2, two reaction pathways were evaluated-the first one considering only ionic species (Cl⁺ and OH(-)) and the second one taking into account the entire hypochlorous acid molecule (HOCl). Both pathways were studied theoretically in gas and solution phases. In the first suggested pathway, the reaction involves the addition of chlorenium ion to 1 forming a non-classic carbocation assisted by anchimeric effect of the nearest aromatic system, and then a nucleophilic attack to the intermediate by the hydroxide ion. In the second studied pathway, as a first step, the attack of the double bond from the furanic moiety of 1 to the hypochlorous acid is considered, accomplishing the same non-classical carbocation, and again in the second step, a nucleophilic attack by the hydroxide ion. In order to validate both reaction pathways, the atomic charges, the highest occupied molecular orbital and the lowest unoccupied molecular orbital were obtained for both substrate and product. The corresponding data imply that the C₉ atom is the more suitable site of the substrate to interact with the hydroxide ion. It was demonstrated by theoretical calculations that a vicinal and anti chlorohydrin is produced in the terminal furan ring. Data of the studied compound indicate an important reduction in the cytotoxic and genotoxic potential of the target molecule, as demonstrated previously by our research group using different in vitro assays.
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Affiliation(s)
- René Escobedo-González
- UNAM-FESC. Campus 1. Chemical Sciences Department, Cuautitlan Izcalli, C. P. 54740, Mexico.
| | - Abraham Méndez-Albores
- UNAM-FESC. Campus 4. Multidisciplinary Research Unit L14 (Food, Mycotoxins and Mycotoxicosis), Cuautitlan Izcalli 54714, Mexico.
| | | | | | - René Miranda-Ruvalcaba
- UNAM-FESC. Campus 1. Chemical Sciences Department, Cuautitlan Izcalli, C. P. 54740, Mexico.
| | - Inés Nicolás-Vázquez
- UNAM-FESC. Campus 1. Chemical Sciences Department, Cuautitlan Izcalli, C. P. 54740, Mexico.
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Gupta U, Kumar V, Singh VK, Kant R, Khajuria Y. Spectroscopic studies and quantum chemical investigations of (3,4-dimethoxybenzylidene) propanedinitrile. Spectrochim Acta A Mol Biomol Spectrosc 2015; 140:65-73. [PMID: 25589388 DOI: 10.1016/j.saa.2014.12.063] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2014] [Revised: 12/13/2014] [Accepted: 12/17/2014] [Indexed: 06/04/2023]
Abstract
The Fourier Transform Infrared (FTIR), Ultra-Violet Visible (UV-Vis) spectroscopy and Thermogravimetric (TG) analysis of (3,4-dimethoxybenzylidene) propanedinitrile have been carried out and investigated using quantum chemical calculations. The molecular geometry, harmonic vibrational frequencies, Mulliken charges, natural atomic charges and thermodynamic properties in the ground state have been investigated by using Hartree Fock Theory (HF) and Density Functional Theory (DFT) using B3LYP functional with 6-311G(d,p) basis set. Both HF and DFT methods yield good agreement with the experimental data. Vibrational modes are assigned with the help of Vibrational Energy Distribution Analysis (VEDA) program. UV-Visible spectrum was recorded in the spectral range of 190-800nm and the results are compared with the calculated values using TD-DFT approach. Stability of the molecule arising from hyperconjugative interactions, charge delocalization have been analyzed using natural bond orbital (NBO) analysis. The results obtained from the studies of Highest Occupied Molecular Orbital (HOMO) and Lowest Unoccupied Molecular Orbital (LUMO) are used to calculate molecular parameters like ionization potential, electron affinity, global hardness, electron chemical potential and global electrophilicity.
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Affiliation(s)
- Ujval Gupta
- School of Physics, Shri Mata Vaishno Devi University, Kakryal, Katra 182320, Jammu & Kashmir, India
| | - Vinay Kumar
- School of Physics, Shri Mata Vaishno Devi University, Kakryal, Katra 182320, Jammu & Kashmir, India
| | - Vivek K Singh
- School of Physics, Shri Mata Vaishno Devi University, Kakryal, Katra 182320, Jammu & Kashmir, India
| | - Rajni Kant
- X-ray Crystallography Laboratory, Post-Graduate Department of Physics, University of Jammu, Jammu Tawi 180 006, India
| | - Yugal Khajuria
- School of Physics, Shri Mata Vaishno Devi University, Kakryal, Katra 182320, Jammu & Kashmir, India.
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Miller WA, Moore PB. Computational Study of Intramolecular Heterocyclic Ring Formation with Cyclic Phosphazenes. Int J Eng Res Technol (Ahmedabad) 2014; 3:1575-1582. [PMID: 26702403 PMCID: PMC4686155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
Polyphosphazenes, because of their unique properties, have generated many opportunities to explore a variety of applications. These applications include areas such as biomedical research (e.g. drug delivery) and material science (e.g. fire-resistant polymers). Phosphazenes potentially have more variations then benzene analogues because of different substitution patterns. Here we present A computational study of the chemical modifications to a group of cyclic phosphazenes mainly hexachlorophosphazene (PNCl2)3. This study focuses on the relative energies of reactivity of hexachlorophosphazene to understand their geometry and the complexes they likely form. We compare diols, amino alcohols, and diamines with a carbon linker of 1-7 atoms. These heteroatom chains are attached to a single phosphorus atom or adjoining phosphorus atoms to form ring structures of geminal, vicinal (cis), and vicinal (trans) moieties. We find that the reactivities of "heteroatom caps" are predicted to be O,O (diol) > N,O (amino alcohol) > N,N (diamine). These results can be used to predict energetics and thus the stability of new compounds for biomedical and industrial applications.
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Affiliation(s)
- Whelton A. Miller
- Department of Bioengineering, School of Engineering and Applied Science, University of Pennsylvania, Philadelphia, PA 19104 USA
| | - Preston B. Moore
- Department of Chemistry and Biochemistry, University of the Sciences in Philadelphia, Philadelphia, PA 19104 USA
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George Z, Kroon R, Gehlhaar R, Gbabode G, Lundin A, Hellström S, Müller C, Geerts Y, Heremans P, Andersson MR. The Influence of Alkoxy Substitutions on the Properties of Diketopyrrolopyrrole-Phenyl Copolymers for Solar Cells. Materials (Basel) 2013; 6:3022-34. [PMID: 28811420 DOI: 10.3390/ma6073022] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/20/2013] [Revised: 07/02/2013] [Accepted: 07/09/2013] [Indexed: 11/17/2022]
Abstract
A previously reported diketopyrrolopyrrole (DPP)-phenyl copolymer is modified by adding methoxy or octyloxy side chains on the phenyl spacer. The influence of these alkoxy substitutions on the physical, opto-electronic properties, and photovoltaic performance were investigated. It was found that the altered physical properties correlated with an increase in chain flexibility. Well-defined oligomers were synthesized to verify the observed structure-property relationship. Surprisingly, methoxy substitution on the benzene spacer resulted in higher melting and crystallization temperatures in the synthesized oligomers. This trend is not observed in the polymers, where the improved interactions are most likely counteracted by the larger conformational possibilities in the polymer chain upon alkoxy substitution. The best photovoltaic performance was obtained for the parent polymer: fullerene blends whereas the modifications on the other two polymers result in reduced open-circuit voltage and varying current densities under similar processing conditions. The current densities could be related to different polymer: fullerene blend morphologies. These results show that supposed small structural alterations such as methoxy substitution already significantly altered the physical properties of the parent polymer and also that oligomers and polymers respond divergent to structural alterations made on a parent structure.
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