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Overoxidized poly(3,4-ethylenedioxythiophene)-overoxidized polypyrrole composite films with enhanced electrocatalytic ability for rutin and luteolin determination. Front Chem Sci Eng 2023. [DOI: 10.1007/s11705-022-2262-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/16/2023]
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2
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Yang N, Yu S, Zhang W, Cheng HM, Simon P, Jiang X. Electrochemical Capacitors with Confined Redox Electrolytes and Porous Electrodes. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2202380. [PMID: 35413141 DOI: 10.1002/adma.202202380] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Revised: 04/08/2022] [Indexed: 06/14/2023]
Abstract
Electrochemical capacitors (ECs), including electrical-double-layer capacitors and pseudocapacitors, feature high power densities but low energy densities. To improve the energy densities of ECs, redox electrolyte-enhanced ECs (R-ECs) or supercapbatteries are designed through employing confined soluble redox electrolytes and porous electrodes. In R-ECs the energy storage is based on diffusion-controlled faradaic processes of confined redox electrolytes at the surface of a porous electrode, which thus take the merits of high power densities of ECs and high energy densities of batteries. In the past few years, there has been great progress in the development of this energy storage technology, particularly in the design and synthesis of novel redox electrolytes and porous electrodes, as well as the configurations of new devices. Herein, a full-screen picture of the fundamentals and the state-of-art progress of R-ECs are given together with a discussion and outlines about the challenges and future perspectives of R-ECs. The strategies to improve the performance of R-ECs are highlighted from the aspects of their capacitances and capacitance retention, power densities, and energy densities. The insight into the philosophies behind these strategies will be favorable to promote the R-EC technology toward practical applications of supercapacitors in different fields.
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Affiliation(s)
- Nianjun Yang
- Institute of Materials Engineering, University of Siegen, Siegen, 57076, Germany
| | - Siyu Yu
- School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China
| | - Wenjun Zhang
- Center of Super-Diamond and Advanced Films, Department of Materials Science and Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
- City University of Hong Kong Shenzhen Research Institute, Shenzhen, 518057, China
| | - Hui-Ming Cheng
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China
- Faculty of Materials Science and Engineering/Institute of Technology for Carbon Neutrality, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, China
- Advanced Technology Institute, University of Surrey, Guildford, Surrey, GU2 7XH, UK
| | - Patrice Simon
- CIRIMAT, UMR CNRS 5085, Université Toulouse III - Paul Sabatier, Toulouse, 31062, France
| | - Xin Jiang
- Institute of Materials Engineering, University of Siegen, Siegen, 57076, Germany
- Institute of Oceanographic Instrumentation, Qilu University of Technology (Shandong Academy of Science), Qingdao, 266001, China
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3
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Gunasekara DSW, Niu X, Lqbal W, He Y, Liu H. Pyrrole Coating with In Situ Polymerization for Piezoresistive Sensor Development - A Review. Macromol Res 2022. [DOI: 10.1007/s13233-022-0022-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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4
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Abere Y, Helmick G, Blaisten-Barojas E. Modeling oxidised polypyrrole in the condensed phase with a novel force field. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:185701. [PMID: 34654003 DOI: 10.1088/1361-648x/ac303b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Accepted: 10/15/2021] [Indexed: 06/13/2023]
Abstract
A novel model potential is developed for simulating oxidised oligopyrroles in condensed phases. The force field is a coarse grained model that represents the pyrrole monomers as planar rigid bodies with fixed charge and dipole moment and the chlorine dopants as point atomic charges. The analytic function contains 17 adjustable parameters that are initially fitted on a database of small structures calculated within all-electron density functional theory. A subsequent potential function refinement is pursued with a battery of condensed phase isothermal-isobaric Metropolis Monte Carlo in-silico simulations at ambient conditions with the goal of implementing a hybrid parametrization protocol enabling agreement with experimentally known thermodynamic properties of oxidised polypyrrole. The condensed system is composed of oligomers containing 12 monomers with a 1:3 dopant-to-monomer concentration. The final set of force field optimised parameters yields an equilibrium density of the condensed system at ambient conditions in excellent agreement with oxidised polypyrrole samples synthesised in wet-laboratories.
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Affiliation(s)
- Yoseph Abere
- Center for Simulation and Modeling and Department of Computational and Data Sciences, George Mason University, 4400 University Drive, Fairfax, VA 22030, United States of America
| | - Greg Helmick
- Center for Simulation and Modeling and Department of Computational and Data Sciences, George Mason University, 4400 University Drive, Fairfax, VA 22030, United States of America
| | - Estela Blaisten-Barojas
- Center for Simulation and Modeling and Department of Computational and Data Sciences, George Mason University, 4400 University Drive, Fairfax, VA 22030, United States of America
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5
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Abstract
The present short review discusses the computational studies carried out on polyacetylene (PAc), polyaniline (PANI), polypyrrole (PPy), and other conducting polymers for predicting their electronic, optoelectronic and structural properties. Studies...
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N-Arylation of Protected and Unprotected 5-Bromo-2-aminobenzimidazole as Organic Material: Non-Linear Optical (NLO) Properties and Structural Feature Determination through Computational Approach. Molecules 2021; 26:molecules26226920. [PMID: 34834012 PMCID: PMC8624707 DOI: 10.3390/molecules26226920] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Revised: 10/11/2021] [Accepted: 10/20/2021] [Indexed: 11/17/2022] Open
Abstract
The interest in the NLO response of organic compounds is growing rapidly, due to the ease of synthesis, availability, and low loss. Here, in this study, Cu(II)-catalyzed selective N-arylation of 2-aminobenzimidazoles derivatives were achieved in the presence of different bases Et3N/TMEDA, solvents DCM/MeOH/H2O, and various aryl boronic acids under open atmospheric conditions. Two different copper-catalyzed pathways were selected for N-arylation in the presence of active nucleophilic sites, providing a unique tool for the preparation of NLO materials, C-NH (aryl) derivatives of 2-aminobenzimidazoles with protection and without protection of NH2 group. In addition to NMR analysis, all synthesized derivatives (1a–1f and 2a–2f) of 5-bromo-2-aminobenzimidazole (1) were computed for their non-linear optical (NLO) properties and reactivity descriptor parameters. Frontier molecular orbital (FMO) analysis was performed to get information about the electronic properties and reactivity of synthesized compounds.
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Coleone AP, Barboza BH, Batagin‐Neto A. Polypyrrole derivatives for detection of toxic gases: A theoretical study. POLYM ADVAN TECHNOL 2021. [DOI: 10.1002/pat.5449] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Alex Pifer Coleone
- School of Sciences, POSMAT São Paulo State University (UNESP) Bauru/SP Brazil
| | - Bruno Hori Barboza
- School of Sciences, POSMAT São Paulo State University (UNESP) Bauru/SP Brazil
| | - Augusto Batagin‐Neto
- School of Sciences, POSMAT São Paulo State University (UNESP) Bauru/SP Brazil
- Campus of Itapeva São Paulo State University (UNESP) Itapeva/SP Brazil
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Wu L, Wei Q, Zhang Y, Fan Y, Li M, Rong L, Xiao X, Huang X, Zou X. Effects of antibiotics on enhanced biological phosphorus removal and its mechanisms. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 774:145571. [PMID: 33611003 DOI: 10.1016/j.scitotenv.2021.145571] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Revised: 01/28/2021] [Accepted: 01/29/2021] [Indexed: 06/12/2023]
Abstract
Many kinds of antibiotics are continuously discharged into wastewater and typically cause a great decrease in sewage treatment performance, whereas mechanisms of differences in the impacts of commonly used antibiotics on phosphate removal are still elusive. Thus, an enhanced biological phosphorus removal (EBPR) system, as an effective method of phosphate removal, was developed, and its performance in the treatment of artificial wastewater containing antibiotics at short- (8 h) and long-term (15 days) exposure was investigated. The results show that phosphorus removal was consistently inhibited by the addition of antibiotics with a significant difference (P < 0.05). To interpret the phenomena, mechanistic equations were developed, and the results indicate that for short-term tests, the difference was mainly caused by the suppression of polyhydroxyalkanoate (PHA) degradation and the activity of polyphosphate kinase (PPK), resulting in the different inhibition of the soluble orthophosphorus (SOP) uptake process. For long-term tests, the difference in SOP uptake was principally caused by the inhibition of PHA degradation and the activity of PPK, whereas the difference in SOP release resulted from the inhibition of activities of exopolyphosphatase (PPX) and adenylate kinase (ADK). Moreover, micro-mechanisms of such inhibition were identified from molecular docking and electrostatic potential.
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Affiliation(s)
- Ligui Wu
- School of Life Science, Jinggangshan University, Ji'an 343009, China
| | - Quantao Wei
- School of Life Science, Jinggangshan University, Ji'an 343009, China
| | - Yingying Zhang
- School of Life Science, Jinggangshan University, Ji'an 343009, China
| | - Yuxing Fan
- School of Life Science, Jinggangshan University, Ji'an 343009, China
| | - Mi Li
- School of Life Science, Jinggangshan University, Ji'an 343009, China
| | - Lingling Rong
- School of Life Science, Jinggangshan University, Ji'an 343009, China
| | - Xiaoyu Xiao
- School of Life Science, Jinggangshan University, Ji'an 343009, China
| | - Xiangfeng Huang
- College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
| | - Xiaoming Zou
- School of Life Science, Jinggangshan University, Ji'an 343009, China; Ji'an Key Laboratory of Red Soil Improvement and Sustainable Utilization, Ji'an 343009, China.
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Darroudi M, Mohammadi Ziarani G, Bahar S, Ghasemi JB, Badiei A. Lansoprazole-Based Colorimetric Chemosensor for Efficient Binding and Sensing of Carbonate Ion: Spectroscopy and DFT Studies. Front Chem 2021; 8:626472. [PMID: 33604329 PMCID: PMC7884336 DOI: 10.3389/fchem.2020.626472] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Accepted: 12/10/2020] [Indexed: 11/13/2022] Open
Abstract
The new benzimidazole based receptor Lansoprazole has been used to detect carbonate anion by naked-eye and Uv-Vis spectroscopy. This receptor revealed visual changes withCO 3 2 - anion in ethanol. No detectable color changes were observed upon the addition of any other tested anions. The lansoprazole chemosensor selectively recognizesCO 3 2 - ion over the other interference anions in the ethanol, followed by deprotonation and reflected 1:1 complex formation between the receptor and the carbonate ion. Lansoprazole exhibits splendid selectivity toward carbonate ion via a visible color change from colorless to yellow with a detection limit of 57 μM. The binding mode ofCO 3 2 - to receptor L is supported by Density Functional Theory calculation. Moreover, this receptor shows a practical visible colorimetric test strip for the detection of carbonate ions. The transition states calculation demonstrates the occurrence of reaction from L to L-CO 3 2 - after overcoming an energy barrier of 10.1 kcal/mol, and there is considerable interaction energy between L andCO 3 2 - (94.9 kJ/mol), both of which confirmed that receptor L has high sensitivity and selectivity to the carbonate ion. The theoretical studies were performed to acquire an electronic description of the complexation mechanism byCO 3 2 - as well as to study bonding and structure in the complex. The optimized structures and binding mechanisms were supported with a high correlation and agreement by spectroscopy and DFT calculations.
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Affiliation(s)
- Mahdieh Darroudi
- Department of Chemistry, Faculty of Physics and Chemistry, Alzahra University, Tehran, Iran
| | | | - Shahriyar Bahar
- Department of Chemistry, Faculty of Physics and Chemistry, Alzahra University, Tehran, Iran
| | - Jahan B. Ghasemi
- School of Chemistry, College of Science, University of Tehran, Tehran, Iran
| | - Alireza Badiei
- School of Chemistry, College of Science, University of Tehran, Tehran, Iran
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Lascane LG, Oliveira EF, Galvão DS, Batagin-Neto A. Polyfuran-based chemical sensors: Identification of promising derivatives via DFT calculations and fully atomistic reactive molecular dynamics. Eur Polym J 2020. [DOI: 10.1016/j.eurpolymj.2020.110085] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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11
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Remarkable enhancement in sensor ability of polyaniline upon composite formation with ZnO for industrial effluents. J Mol Graph Model 2020; 101:107724. [PMID: 32937278 DOI: 10.1016/j.jmgm.2020.107724] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2020] [Revised: 08/13/2020] [Accepted: 08/21/2020] [Indexed: 11/21/2022]
Abstract
Polyaniline emeraldine salt and Polyaniline Zinc Oxide composite are comprehensively studied to compare their sensing ability towards ammonia, acetone, methanol and ethanol. Sensing ability is evaluated through thermodynamic, geometric and electronic parameters. A number of orientations are evaluated in search for the lowest energy structure. The comparison of thermodynamic, geometric and electronic parameters of simple and composite sensors confirmed that composite sensor shows better sensing ability than simple PANI. Composite formation between polyaniline and zinc oxide is a thermodynamically feasible process with interaction energy of -42.8 kcal/mol. Both sensor shows highest interaction energy for ethanol among four analytes. Composite sensor shows almost twice the interaction with ethanol, methanol and acetone while 1.5 times the interaction energy for ammonia. The results of run simulations and subsequent calculations showed that in composite sensors, zinc oxide not only enhances the binding power of conducting polymer with analytes but also interacts directly with analytes. Strong hydrogen bonding as well as weak dispersion forces of attraction are responsible for the stability of composite and all complexes, as revealed by non-covalent interaction (NCI) studies. Acetone shows a different behaviour in composite sensor complex than other analytes.
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Farooqi BA, Yar M, Ashraf A, Farooq U, Ayub K. Graphene-polyaniline composite as superior electrochemical sensor for detection of cyano explosives. Eur Polym J 2020. [DOI: 10.1016/j.eurpolymj.2020.109981] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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13
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Sajid H, Ullah F, Ayub K, Mahmood T. Cyclic versus straight chain oligofuran as sensor: A detailed DFT study. J Mol Graph Model 2020; 97:107569. [PMID: 32120236 DOI: 10.1016/j.jmgm.2020.107569] [Citation(s) in RCA: 50] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Revised: 01/30/2020] [Accepted: 02/16/2020] [Indexed: 12/24/2022]
Abstract
This study presents a novel approach for exploring the sensitivity and selectivity of cyclic oligofuran (5/6/7CF) toward gaseous analytes and their comparison with straight chain analogues (5/6/7SF). The work is not only vital to understand the superior sensitivity but also for rational design of new sensors based on cyclic ring structures of oligofuran. Interaction of cyclic and straight chain oligofuran with NH3, CO, CO2, N2H4, HCN, H2O2, H2S, CH4, CH3OH, SO2, SO3 and H2O analytes is studied via DFT calculation at B3LYP-D3/6-31++G (d, p) level of theory. The sensitivity and selectivity are illustrated by the thermodynamic parameters (Ebind, SAPT0 energies, NCI analysis), electronic properties (H-L gap, percentage of average energy gap, CHELPG charge transfer, DOS spectra), and UV-Vis analysis. All these properties are simulated at B3LYP/6-31G (d) level of theory while UV-Vis is calculated at TD-DFT method. Cyclic oligofurans have high binding energies with analytes compared to 5/6/7SF which corresponds to higher sensitivity of 5/6/7CF. Furthermore, the cyclization of oligofuran significantly improves the sensitivity and selectivity of the system. Alteration in electronic properties of 5/6/7CF and 5/6/7SF is remarkably high upon complexation with SO2 and SO3. Further the stability of rings (5, 6 and 7 membered cyclic oligofurans) and their SO3 complexes is also confirmed by molecular dynamics calculations. The findings of the work clearly suggest that the cyclic geometry enhances not only sensitivity but also selectivity of conducting polymers (oligofuran).
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Affiliation(s)
- Hasnain Sajid
- Department of Chemistry, COMSATS University Islamabad, Abbottabad Campus, Abbottabad, 22060, Pakistan
| | - Faizan Ullah
- Department of Chemistry, COMSATS University Islamabad, Abbottabad Campus, Abbottabad, 22060, Pakistan
| | - Khurshid Ayub
- Department of Chemistry, COMSATS University Islamabad, Abbottabad Campus, Abbottabad, 22060, Pakistan
| | - Tariq Mahmood
- Department of Chemistry, COMSATS University Islamabad, Abbottabad Campus, Abbottabad, 22060, Pakistan.
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14
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Electronic structure of polythiophene gas sensors for chlorinated analytes. J Mol Model 2020; 26:44. [PMID: 32009185 DOI: 10.1007/s00894-020-4287-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2019] [Accepted: 01/10/2020] [Indexed: 10/25/2022]
Abstract
Density functional theory studies are performed to investigate the response of polythiophene as a sensor for chlorinated gaseous analytes. Interaction of polythiophene with these analytes is studied from both H-side (dipole-dipole) and Cl-side (halogen bonding) of analyte to get the most stable interaction site. Inferences from interaction energy, natural bond orbital, and Mulliken charge analyses are in line with those from geometric analysis. Interaction energies reveal that polythiophene has specificity and selectivity towards chlorine. Interestingly, the halogen bond in PT-Cl2 complexes is stronger than ion-dipole bond in the complexes of polythiophene with other analytes. The sensing of polythiophene towards these analytes is also measured by perturbing the electronic properties including ionization potential, electron affinity, λmax, and H→L gap. The spectroscopic properties (UV absorption spectra) reveal the interaction behavior of polythiophene with these chlorinated analytes. All these parameters including orbital analysis and H→L energies indicate high sensitivity of polythiophene for chlorine. Graphical abstractInteraction of chlorinated gaseous analytes with polythiophene surface.
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15
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Sajid H, Ayub K, Arshad M, Mahmood T. Highly selective acridinium based cyanine dyes for the detection of DNA base pairs (adenine, cytosine, guanine and thymine). COMPUT THEOR CHEM 2019. [DOI: 10.1016/j.comptc.2019.112509] [Citation(s) in RCA: 67] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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16
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Princy Maria J, Bhuvaneswari R, Nagarajan V, Chandiramouli R. Diethanolamine and quaternium-15 interaction studies on antimonene nanosheet based on first-principles studies. COMPUT THEOR CHEM 2019. [DOI: 10.1016/j.comptc.2019.04.007] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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17
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Mizera A, Grabowski SJ, Ławniczak P, Wysocka-Żołopa M, Dubis AT, Łapiński A. A study of the optical, electrical and structural properties of poly(pyrrole-3,4-dicarboxylic acid). POLYMER 2019. [DOI: 10.1016/j.polymer.2018.12.056] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Coleone AP, Lascane LG, Batagin-Neto A. Polypyrrole derivatives for optoelectronic applications: a DFT study on the influence of side groups. Phys Chem Chem Phys 2019; 21:17729-17739. [PMID: 31367712 DOI: 10.1039/c9cp02638j] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Conjugated organic polymers have been considered interesting materials for various technological applications, mainly due to their unique optoelectronic properties and the variety of methods employed in their synthesis. In this context, polypyrrole (PPy) derivatives have been widely employed. The great versatility of synthesis of this material allows the production of a number of derivatives with distinct properties, allowing their application in several areas. In this report, aiming to guide the design of compounds with specific features, electronic structure calculations were conducted to evaluate the influence of side groups in the structural, optical and electronic properties of PPy derivatives. The calculations were carried out for oligomeric systems in the framework of density functional theory. Preliminary benchmark studies were conducted by employing two distinct functionals for geometry optimization and evaluation of optoelectronic properties. Comparative studies of the bond length alternation, spatial and energetic distribution of the frontier orbitals, electronic gaps, exciton binding energies, optical absorption spectra and electronic density of states were conducted for each derivative and the influence of the side groups was discussed in terms of their electron donation/withdrawing properties. A set of simple rules (linear equations) was proposed for the prediction of optoelectronic properties of PPy derivatives. In particular, the results have shown that simple Hammett parameters of side groups are sufficient to enable the design of improved materials.
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Affiliation(s)
- Alex Pifer Coleone
- São Paulo State University (UNESP), Faculty of Sciences, POSMAT, Campus of Bauru, Bauru, SP, Brazil.
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Sajid H, Ayub K, Mahmood T. A comprehensive DFT study on the sensing abilities of cyclic oligothiophenes (nCTs). NEW J CHEM 2019. [DOI: 10.1039/c9nj01894h] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Linear conducting polymers are extensively studied as sensors for various analytes, whereas studies on cyclic analogues are limited.
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Affiliation(s)
- Hasnain Sajid
- Department of Chemistry
- COMSATS University Islamabad
- Abbottabad-22060
- Pakistan
| | - Khurshid Ayub
- Department of Chemistry
- COMSATS University Islamabad
- Abbottabad-22060
- Pakistan
| | - Tariq Mahmood
- Department of Chemistry
- COMSATS University Islamabad
- Abbottabad-22060
- Pakistan
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