1
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Mohmad M, Agnihotri N, Kumar V, Azam M, Kamal R, Kumar A, Sharma U, Javed S, Muthu S, Min K. Preparation of a Pt(II)-3-Hydroxy-2-tolyl-4 H-chromen-4-one Complex Having Antimicrobial, Anticancerous, and Radical Scavenging Activities with Related Computational Studies. ACS OMEGA 2023; 8:31648-31660. [PMID: 37692249 PMCID: PMC10483677 DOI: 10.1021/acsomega.3c01316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Accepted: 08/10/2023] [Indexed: 09/12/2023]
Abstract
A novel benzopyran-based platinum (II)-3-hydroxy-2-tolyl-4H-chromen-4-one (HToC) complex has been prepared and studied by UV-visible spectrophotometry. The study is based on the colored complexation between Pt(II) and HToC in the pH range of 8.92-9.21, resulting in the formation of a stable binary yellow complex exhibiting λmax at 509-525 nm. The formed complex maintains linearity between 0.0 and 1.8 μg Pt(II) mL-1. The well-known qualitative analytical methods, including Job's method of continuous variations and the mole ratio approach, have both proven that the stoichiometry of the complex is 1:2 [Pt(II)/HToC]. Hence, the analytical results suggest that the formed platinum complex exhibits a square planar geometry. The values of various attributes corresponding to spectrophotometric studies and statistical calculations, such as the molar extinction coefficient (6.790 × 104 L mol-1 cm-1), Sandell's sensitivity (0.0029 μg Pt(II) cm-2), standard deviation (± 0.0011), RSD (0.317%), limit of detection (0.0147 μg mL-1) and correlation coefficient (0.9999), show that the performed study satisfies all of the criteria for good sensitivity, versatility, and cost-effectiveness. In order to have an apprehension of the molecular geometry and other structural specifics of the complex, DFT studies have been carried out. The in vitro anticancer potential of the ligand and its platinum complex in the human breast cancer cell line (T-27D), as determined by the MTT assay, reveals that the complex has better antiproliferative potential than the ligand. The antimicrobial potential of the complex has been successfully tested against both Gram-positive and -negative bacteria. Antioxidant capacity results suggest the better radical scavenging capacity of the complex than that of the ligand.
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Affiliation(s)
- Masrat Mohmad
- Department
of Chemistry, Maharishi Markandeshwar (Deemed
to be University), Mullana, Ambala 133207, India
| | - Nivedita Agnihotri
- Department
of Chemistry, Maharishi Markandeshwar (Deemed
to be University), Mullana, Ambala 133207, India
| | - Vikas Kumar
- Department
of Biotechnology, Maharishi Markandeshwar
(Deemed to be University), Mullana, Ambala 133207, India
| | - Mohammad Azam
- Department
of Chemistry, College of Science, King Saud
University, P. O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Raj Kamal
- Department
of Chemistry, Kurukshetra University, Kurukshetra 136119, India
| | - Ashish Kumar
- Department
of Chemistry, Kurukshetra University, Kurukshetra 136119, India
| | - Ujjawal Sharma
- Department
of Human Genetics and Molecular Medicine, School of Health Sciences, Central University of Punjab, Bhatinda 151401, India
| | - Saleem Javed
- Department
of Chemistry, Jamia Millia Islamia, New Delhi 110025, India
| | - Sambantham Muthu
- Department
of Physics, Aringnar Anna Govt. Arts College, Cheyyar 604407, India
| | - Kim Min
- Department
of Safety Engineering, Dongguk University, 123 Dongdae-ro, Gyeongju 780714, Gyeongbuk, South Korea
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2
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Dhonchak C, Agnihotri N, Kumar A. Zirconium (IV)-3-hydroxy-2-tolyl-4H-chromen-4-one complex-the analytical and DFT studies. J Mol Model 2021; 27:336. [PMID: 34719724 DOI: 10.1007/s00894-021-04949-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Accepted: 10/13/2021] [Indexed: 10/19/2022]
Abstract
Trace determination of Zr(IV) was carried out by its complexation with a newly synthesized chromone derivative, 3-hydroxy-2-tolyl-4H-chromen-4-one (HToC) for the formation of a 1:4 (M:L) yellow-colored complex from the bicarbonate medium maintained at pH 7.90-8.13. The complex was extractable into the non-aqueous organic solvents showing maximum and stable color intensity in dichloromethane in the wavelength range 414-430 nm. The complex obeyed Beer's law showing linearity of calibration curve in the range 0.0-1.1 µg Zr(IV) ml-1 with an optimum range of determination as 0.44-1.0 ppm Zr(IV) detected from the Ringbom plot. Molar absorptivity, specific absorptivity, and Sandell's sensitivity of thus prepared complex were ascertained, respectively as 4.1971 × 104 l mol-1 cm-1, 0.4601 ml g-1 cm-1, and 0.0022 µg Zr(IV) cm-2 at 420 nm. The linear regression equation being [Formula: see text] (Y = absorbance, X = µg Zr(IV) ml-1) with the correlation coefficient of 0.9977 and detection limit of the procedure as 0.0729 µg ml-1. Theoretical calculations were used to determine and compare structural and bonding properties of the Zr(IV)-HToC complex along with justification of the donor sites provided by ligand for complexation with respect to the metal. The consequences obtained were highly cogent with standard deviation of ± 0.0021 absorbance unit. The procedure was applied to various synthetic (some analogous to cooperate and nickel zirconium) and technical (reverberatory flue dust and water) samples with satisfactory results.
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Affiliation(s)
- Chetna Dhonchak
- Department of Chemistry, Maharishi Markandeshwar (Deemed To Be University), Mullana, Ambala, 133207, Haryana, India
| | - Nivedita Agnihotri
- Department of Chemistry, Maharishi Markandeshwar (Deemed To Be University), Mullana, Ambala, 133207, Haryana, India.
| | - Akshay Kumar
- Department of Chemistry, Dyal Singh College, Karnal, 132001, Haryana, India
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Mauksch M, Tsogoeva SB. Disclosure of Ground-State Zimmerman-Möbius Aromaticity in the Radical Anion of [6]Helicene and Evidence for 4π Periodic Aromatic Ring Currents in a Molecular "Metallic" Möbius Strip. Chemistry 2021; 27:14660-14671. [PMID: 34375466 PMCID: PMC8596793 DOI: 10.1002/chem.202102230] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Indexed: 12/19/2022]
Abstract
In 1966, Zimmerman proposed a type of Möbius aromaticity that involves through-space electron delocalization; it has since been widely applied to explain reactivity in pericyclic reactions, but is considered to be limited to transition-state structures. Although the easily accessible hexahelicene radical anion has been known for more than half a century, it was overlooked that it exhibits a ground-state minimum and robust Zimmerman-Möbius aromaticity in its central noose-like opening, becoming, hence, the oldest existing Möbius aromatic system and with smallest Möbius cycle known. Despite its overall aromatic stabilization energy of 13.6 kcal mol-1 (at B3LYP/6-311+G**), the radical also features a strong, globally induced paramagnetic ring current along its outer edge. Exclusive global paramagnetic currents can also be found in other fully delocalized radical anions of 4N+2 π-electron aromatic polycyclic benzenoid hydrocarbons (PAH), thus questioning the established magnetic criterion of antiaromaticity. As an example of a PAH with nontrivial topology, we studied a novel Möbius[16]cyclacene that has a non-orientable surface manifold and a stable closed-shell singlet ground state at several density functional theory levels. Its metallic monoanion radical (0.0095 eV band gap at HSE06/6-31G* level) is also wave-function stable and displays an unusual 4π-periodic, magnetically induced ring current (reminiscent of the transformation behaviour of spinors under spatial rotation), thus indicating the existence of a new, Hückel-rule-evading type of aromaticity.
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Affiliation(s)
- Michael Mauksch
- Department of Chemistry and Pharmacy, Institute of Theoretical Chemistry, Computer Chemistry Center, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Nägelsbachstrasse 25a, 91052, Erlangen, Germany
| | - Svetlana B Tsogoeva
- Department of Chemistry and Pharmacy, Organic Chemistry Chair I and, Interdisciplinary Center for Molecular Materials (ICMM), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Nikolaus-Fiebinger Str. 10, 91058, Erlangen, Germany
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4
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Nehra N, Tittal RK, Ghule VD. 1,2,3-Triazoles of 8-Hydroxyquinoline and HBT: Synthesis and Studies (DNA Binding, Antimicrobial, Molecular Docking, ADME, and DFT). ACS OMEGA 2021; 6:27089-27100. [PMID: 34693129 PMCID: PMC8529673 DOI: 10.1021/acsomega.1c03668] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Accepted: 09/21/2021] [Indexed: 05/27/2023]
Abstract
A new series of 1,2,3-triazole hybrids containing either 2- or 4-hydroxyphenyl benzothiazole (2- or 4-HBT) and naphthalen-1-ol or 8-hydroxyquinoline (8-HQ) was synthesized in high yields and fully characterized. In vitro DNA binding studies with herring fish sperm DNA (hs-DNA) showed that quinoline- and 2-HBT-linked 1,2,3-triazoles of shorter alkyl linkers such as 6a are better with a high binding affinity (3.90 × 105 L mol-1) with hs-DNA as compared to naphthol- and 4-HBT-linked 1,2,3-triazoles bound to longer alkyl linkers. Molecular docking of most active 1,2,3-triazoles 6a-f showed high binding energy of 6a (-8.7 kcal mol-1). Also, compound 6a displayed considerable antibacterial activity and superior antifungal activity with reference to ciprofloxacin and fluconazole, respectively. The docking results of the fungal enzyme lanosterol 14-α-demethylase showed high binding energy for 6a (-9.7 kcal mol-1) involving dominating H-bonds, electrostatic interaction, and hydrophobic interaction. The absorption, distribution, metabolism, and excretion (ADME) parameter, Molinspiration bioactivity score, and the PreADMET properties revealed that most of the synthesized 1,2,3-triazole molecules possess desirable physicochemical properties for drug-likeness and may be considered as orally active potential drugs. The electrophilicity index and chemical hardness properties were also studied by density functional theory (DFT) using the B3LYP/6-311G(d,p) level/basis set.
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Affiliation(s)
- Nidhi Nehra
- Department of Chemistry, National Institute of Technology Kurukshetra, Kurukshetra, Haryana 136119, India
| | - Ram Kumar Tittal
- Department of Chemistry, National Institute of Technology Kurukshetra, Kurukshetra, Haryana 136119, India
| | - Vikas D. Ghule
- Department of Chemistry, National Institute of Technology Kurukshetra, Kurukshetra, Haryana 136119, India
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5
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Wong ZC, Ungur L. Exploring vibronic coupling in the benzene radical cation and anion with different levels of the GW approximation. Phys Chem Chem Phys 2021; 23:19054-19070. [PMID: 34612443 DOI: 10.1039/d1cp02795f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The linear vibronic coupling constants of the benzene radical cation and anion have been obtained with different levels of the GW approximation, including G0W0, eigenvalue self-consistent GW, and quasiparticle self-consistent GW, as well as DFT with the following exchange-correlation functionals: BLYP, B3LYP, CAM-B3LYP, tuned CAM-B3LYP, and an IP-tuned CAM-B3LYP functional. The vibronic coupling constants were calculated numerically using the gradients of the eigenvalues of the degenerate HOMOs and LUMOs of the neutral benzene molecule for DFT, while the numerical gradients of the quasiparticle energies were used in the case of GW. The results were evaluated against those of high level wave function methods in the literature, and the approximate self-consistent GW methods and G0W0 with long-range corrected functionals were found to yield the best results on the whole.
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Affiliation(s)
- Zi Cheng Wong
- Department of Chemistry, National University of Singapore, Block S8 Level 3, 3 Science Drive 3, 117543, Singapore.
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6
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Richardson K, Brown J. In Silico Reagent Design for Electron-Transfer Dissociation on a Q-TOF. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2021; 32:2092-2098. [PMID: 33750126 DOI: 10.1021/jasms.0c00483] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Electron-transfer dissociation is an important technique capable of probing the primary and higher order structure of a wide variety of biomolecules and yielding information that is often inaccessible using other common MS methods. The source of the electron used to initiate the fragmentation event is a radical anion, and the fragmentation process therefore depends intimately on the electronic properties of both the reagent and analyte ions. A good reagent must ionize easily and be sufficiently robust to survive transport to the reaction location, but must also be capable of donating an electron to analyte cations efficiently enough to overcome competition with other ion-ion reaction channels. Inspired by the work of Gunawardena et al. ( J. Am. Chem. Soc. 2005, 127, 12627), an in silico workflow to allow prescreening of potential electron-transfer reagents for use in glow-discharge sources is described. Approximately 150 candidate molecules have been characterized using this workflow. We discuss in detail the properties of a selected subset of singly and doubly substituted benzenes and introduce five effective new reagents that have been identified as a result of this work.
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Affiliation(s)
| | - Jeffery Brown
- Waters Corporation, Altrincham Road, Wilmslow SK9 4AX, U.K
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7
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Dmitrieva OA, Chizhova NV, Tesakova MV, Parfenyuk VI, Mamardashvili NZ. Meso-nitro substitution as a means of Mn-octaethylporphyrin redox state controlling. J Organomet Chem 2021. [DOI: 10.1016/j.jorganchem.2021.121790] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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8
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Singh S, Gupta D, Antony B, Tudorovskaya M, Tennyson J. Electron Scattering Cross Sections for Anthracene and Pyrene. J Phys Chem A 2020; 124:7088-7100. [PMID: 32786972 DOI: 10.1021/acs.jpca.0c05589] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
UK molecular R-matrix calculations have been carried out for electron scattering from anthracene and pyrene. These molecules belong to the family of polycyclic hydrocarbons (PAHs) and are found in a nebula known as the Red Rectangle. Static exchange (SE), static exchange plus polarization (SEP), and close coupling (CC) approximations are used for scattering calculations. Different elastic and inelastic cross sections are computed in the present work in the energy range of 0.1-15 eV. Dissociative electron attachment cross sections are also calculated for both the molecules. Various shape, Feshbach/core-excited, and mixed resonances are detected for these molecules below 10 eV. All of the resonances detected in the present study are in agreement with the existing experimental and theoretical results. Due to the complexity of the present targets, electron collision cross sections are essentially unknown and hence most of the results are presented for the first time.
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Affiliation(s)
- Suvam Singh
- Atomic and Molecular Physics Lab, Department of Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad, JH 826004, India
| | - Dhanoj Gupta
- Plasma Technology Research Center, National Fusion Research Institute, 37 Dongjangsan-ro, Gunsan, Jeollabuk-do 54004, South Korea.,Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot 7610010, Israel
| | - Bobby Antony
- Atomic and Molecular Physics Lab, Department of Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad, JH 826004, India
| | - Maria Tudorovskaya
- Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, U.K
| | - Jonathan Tennyson
- Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, U.K
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9
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Mensa-Bonsu G, Lietard A, Tozer DJ, Verlet JRR. Low energy electron impact resonances of anthracene probed by 2D photoelectron imaging of its radical anion. J Chem Phys 2020; 152:174303. [PMID: 32384861 DOI: 10.1063/5.0007470] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Electron-molecule resonances of anthracene were probed by 2D photoelectron imaging of the corresponding radical anion up to 3.7 eV in the continuum. A number of resonances were observed in both the photoelectron spectra and angular distributions, and most resonances showed clear autodetachment dynamics. The resonances were assigned using density functional theory calculations and are consistent with the available literature. Competition between direct and autodetachment, as well as signatures of internal conversion between resonances, was observed for some resonances. For the 12B2g resonance, a small fraction of population recovers the ground electronic state as evidenced by thermionic emission. Recovery of the ground electronic state offers a route of producing anions in an electron-molecule reaction; however, the energy at which this occurs suggests that anthracene anions cannot be formed in the interstellar medium by electron capture through this resonance.
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Affiliation(s)
- Golda Mensa-Bonsu
- Department of Chemistry, Durham University, Durham DH1 3LE, United Kingdom
| | - Aude Lietard
- Department of Chemistry, Durham University, Durham DH1 3LE, United Kingdom
| | - David J Tozer
- Department of Chemistry, Durham University, Durham DH1 3LE, United Kingdom
| | - Jan R R Verlet
- Department of Chemistry, Durham University, Durham DH1 3LE, United Kingdom
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10
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Zhong M, Zhou J, Jena P. Rational Design of Stable Dianions by Functionalizing Polycyclic Aromatic Hydrocarbons. Chemphyschem 2017; 18:1937-1942. [PMID: 28481439 DOI: 10.1002/cphc.201700346] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2017] [Revised: 05/07/2017] [Indexed: 11/12/2022]
Abstract
Using density functional theory, we have carried out a systematic study of the stability and electronic properties of neutral and multiply charged molecules Bn C10-n X8 (n=0, 1, 2; X=H, F, CN). Our main objective is to explore if the replacements of core C atoms and/or H atoms in naphthalene (C10 H8 ) can enhance the stability of their dianions. Indeed, we find that the dianions of Bn C10-n (CN)8 are more stable than their monoanions with energies of 0.61 eV, 0.57 eV, and 1.97 eV for n=0, 1, 2, respectively. In addition, polycyclic aromatic hydrocarbons become stable as dianions only when H atoms are substituted by more electronegative species. Thus, a rational design approach by tailoring composition and ligands can lead to a new class of organic molecules that are capable of carrying multiple charges.
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Affiliation(s)
- Mingmin Zhong
- School of Physical Science and Technology, Southwest University, Chongqing, 400715, China.,Department of Physics, Virginia Commonwealth University, Richmond, Virginia, 23284, USA
| | - Jian Zhou
- Department of Physics, Virginia Commonwealth University, Richmond, Virginia, 23284, USA
| | - Puru Jena
- Department of Physics, Virginia Commonwealth University, Richmond, Virginia, 23284, USA
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11
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Wombacher T, Goddard R, Lehmann CW, Schneider JJ. Bowl shaped deformation in a planar aromatic polycycle upon reduction. Li and Na separated dianions of the aromatic polycycle 5,6:11,12-di-o-phenylene-tetracene. Dalton Trans 2017; 46:14122-14129. [DOI: 10.1039/c7dt03039h] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reduction of the PAH LDOPTwith lithium metal in DME results in a massive deformation in the resulting dianionic π-perimeter.
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Affiliation(s)
- T. Wombacher
- Fachbereich Chemie
- Eduard-Zintl-Institut für Anorganische und Physikalische Chemie
- 64287 Darmstadt
- Germany
| | - R. Goddard
- Max-Planck-Institut für Kohlenforschung
- 45470 Mülheim an der Ruhr
- Germany
| | - C. W. Lehmann
- Max-Planck-Institut für Kohlenforschung
- 45470 Mülheim an der Ruhr
- Germany
| | - J. J. Schneider
- Fachbereich Chemie
- Eduard-Zintl-Institut für Anorganische und Physikalische Chemie
- 64287 Darmstadt
- Germany
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12
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Moral M, García G, Garzón A, Granadino-Roldán JM, Fernández-Gómez M. DFT study of the effect of fluorine atoms on the crystal structure and semiconducting properties of poly(arylene-ethynylene) derivatives. J Chem Phys 2016; 144:154902. [DOI: 10.1063/1.4945447] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Mónica Moral
- Renewable Energy Research Institute, University of Castilla-La Mancha, Paseo de la Investigación 1, 02071 Albacete, Spain
| | - Gregorio García
- Department of Chemistry, University of Burgos, Plaza Misael Bañuelos, s/n, 09001 Burgos, Spain
| | - Andrés Garzón
- Department of Physical Chemistry, Faculty of Pharmacy, University of Castilla-La Mancha, Paseo de los Estudiantes, 02071 Albacete, Spain
| | - José M. Granadino-Roldán
- Department of Physical and Analytical Chemistry, Faculty of Experimental Sciences, University of Jaén, Campus Las Lagunillas, s/n, 23071 Jaén, Spain
| | - Manuel Fernández-Gómez
- Department of Physical and Analytical Chemistry, Faculty of Experimental Sciences, University of Jaén, Campus Las Lagunillas, s/n, 23071 Jaén, Spain
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13
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Rayne S, Forest K. Benchmarking semiempirical, Hartree–Fock, DFT, and MP2 methods against the ionization energies and electron affinities of short- through long-chain [n]acenes and [n]phenacenes. CAN J CHEM 2016. [DOI: 10.1139/cjc-2015-0526] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Vertical and adiabatic ionization energies (IEs) and electron affinities (EAs) were calculated for the n = 1–10 [n]acenes using a wide range of semiempirical, Hartree–Fock, density functional, and second-order Moller–Plesset perturbation theory model chemistries. None of the model chemistries examined was able to accurately predict the IEs or EAs for both short- through long-chain [n]acenes, as well as for extrapolations to the polymeric limit, when compared to available experimental and benchmark theoretical data. Except for 6-31G(d), the choice of the basis set does not affect B3LYP results significantly. Analogous calculations using a suite of eight modern and (or) popular density functionals for the n = 1–10 [n]phenacenes revealed similar problems in estimating the IEs and EAs of these compounds, with the sole exception of the M062X functional for adiabatic IEs and potentially the APFD, B3LYP, and MN12SX functionals for adiabatic EAs. The poor IE/EA prediction performance for the parent [n]acenes and [n]phenacenes may extend to their substituted derivatives and heteroatom-substituted analogs. Consequently, caution should be exercised in the application of non-high-level calculations for estimating the IE/EA of these important classes of materials.
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Affiliation(s)
- Sierra Rayne
- Chemologica Research, Moose Jaw, SK S6H 6M5, Canada
| | - Kaya Forest
- Department of Environmental Engineering Technology, Saskatchewan Polytechnic, Moose Jaw, SK S6H 4R4, Canada
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14
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Sun S, Zhuang X, Liu B, Wang L, Gu L, Song S, Zhang B, Chen Y. In Situ Synthesis and Characterization of Poly(aryleneethynylene)-Grafted Reduced Graphene Oxide. Chemistry 2016; 22:2247-52. [DOI: 10.1002/chem.201504692] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2015] [Revised: 12/16/2015] [Indexed: 11/07/2022]
Affiliation(s)
- Sai Sun
- Key Lab for Advanced Materials, Institute of Applied Chemistry; East China University of Science and Technology; 130 Meilong Road Shanghai 200237 P. R. China
| | - Xiaodong Zhuang
- College of Chemistry and Chemical Engineering; Shanghai Jiaotong University; 800 Dongchuan Rood Shanghai 200240 P. R. China
| | - Bo Liu
- State Key Laboratory of Functional Materials for Informatics; Shanghai Institute of Micro-system and Information Technology, CAS; 865 Changning Road Shanghai 200050 P. R. China
| | - Luxing Wang
- Key Lab for Advanced Materials, Institute of Applied Chemistry; East China University of Science and Technology; 130 Meilong Road Shanghai 200237 P. R. China
| | - Linfeng Gu
- Key Lab for Advanced Materials, Institute of Applied Chemistry; East China University of Science and Technology; 130 Meilong Road Shanghai 200237 P. R. China
| | - Sannian Song
- State Key Laboratory of Functional Materials for Informatics; Shanghai Institute of Micro-system and Information Technology, CAS; 865 Changning Road Shanghai 200050 P. R. China
| | - Bin Zhang
- Key Lab for Advanced Materials, Institute of Applied Chemistry; East China University of Science and Technology; 130 Meilong Road Shanghai 200237 P. R. China
| | - Yu Chen
- Key Lab for Advanced Materials, Institute of Applied Chemistry; East China University of Science and Technology; 130 Meilong Road Shanghai 200237 P. R. China
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15
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Ray A, Bhattacharya S. Chemical physics behind phthalocyanine–gold nanoparticle interaction and its effect over supramolecular interaction between PC70BM and phthalocyanine in solution. Chem Phys Lett 2015. [DOI: 10.1016/j.cplett.2015.09.015] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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16
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Horn S, Lischka H. A comparison of neutral and charged species of one- and two-dimensional models of graphene nanoribbons using multireference theory. J Chem Phys 2015; 142:054302. [DOI: 10.1063/1.4906540] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Affiliation(s)
- Shawn Horn
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061, USA
| | - Hans Lischka
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061, USA
- Institute for Theoretical Chemistry, University of Vienna, Waehringerstrasse 17, 1090 Vienna, Austria
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17
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Ray A, Pal H, Bhattacharya S. Photophysical insights into fullerene–porphyrazine supramolecular interactions in solution. RSC Adv 2015. [DOI: 10.1039/c5ra02003d] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
This communication reports supramolecular interactions of a porphyrazine derivative, namely, 2,7,12,17-tetra-tert-butyl-5,10,15,20-tetraaza-21H,23H-porphine (1) with C60 and C70 in toluene and dichlorobenzene.
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Affiliation(s)
- Anamika Ray
- Department of Chemistry
- The University of Burdwan
- Burdwan-713 104
- India
| | - Haridas Pal
- Molecular Photochemistry Section
- Radiation & Photochemistry Division
- Bhabha Atomic Research Centre
- Mumbai-400 085
- India
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Khadtare SS, Ware AP, Salunke-Gawali S, Jadkar SR, Pingale SS, Pathan HM. Dye sensitized solar cell with lawsone dye using a ZnO photoanode: experimental and TD-DFT study. RSC Adv 2015. [DOI: 10.1039/c4ra14620d] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A dye sensitized solar cell with lawsone dye and a ZnO photoanode exhibited a 0.68% power conversion efficiency. TD-DFT was used to explore the UV-Vis spectral features of lawsone.
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Affiliation(s)
| | - Anuja P. Ware
- Department of Chemistry
- Savitribai Phule Pune University
- Pune-411007
- India
| | | | - Sandesh R. Jadkar
- Department of Physics
- Savitribai Phule Pune University
- Pune-411007
- India
| | | | - Habib M. Pathan
- Department of Physics
- Savitribai Phule Pune University
- Pune-411007
- India
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19
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Paris C, Alcamí M, Martín F, Díaz-Tendero S. Multiple ionization and hydrogen loss from neutral and positively-charged coronene. J Chem Phys 2014; 140:204307. [DOI: 10.1063/1.4875805] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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20
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Electronic properties of diphenyl-s-tetrazine and some related oligomers. An spectroscopic and theoretical study. Chem Phys 2012. [DOI: 10.1016/j.chemphys.2012.08.022] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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21
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Watson MA, Rappoport D, Lee EMY, Olivares-Amaya R, Aspuru-Guzik A. Electronic structure calculations in arbitrary electrostatic environments. J Chem Phys 2012; 136:024101. [DOI: 10.1063/1.3670417] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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22
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Zade SS, Bendikov M. Reactivity of acenes: mechanisms and dependence on acene length. J PHYS ORG CHEM 2012. [DOI: 10.1002/poc.1941] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Sanjio S. Zade
- Department of Chemical Sciences; Indian Institute of Science Education and Research; Kolkata, PO: BCKV campus main office, Mohanpur; 741252; Nadia; West Bengal; India
| | - Michael Bendikov
- Department of Organic Chemistry; The Weizmann Institute of Science; 76100; Rehovot; Israel
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23
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24
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Zhang B, Chen Y, Liu G, Xu LQ, Chen J, Zhu CX, Neoh KG, Kang ET. Push-Pull archetype of reduced graphene oxide functionalized with polyfluorene for nonvolatile rewritable memory. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/pola.25043] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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25
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Foerster D, Koval P, Sánchez-Portal D. An O(N3) implementation of Hedin's GW approximation for molecules. J Chem Phys 2011; 135:074105. [DOI: 10.1063/1.3624731] [Citation(s) in RCA: 85] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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26
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Zhang B, Liu YL, Chen Y, Neoh KG, Li YX, Zhu CX, Tok ES, Kang ET. Nonvolatile Rewritable Memory Effects in Graphene Oxide Functionalized by Conjugated Polymer Containing Fluorene and Carbazole Units. Chemistry 2011; 17:10304-11. [DOI: 10.1002/chem.201100807] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2011] [Indexed: 11/09/2022]
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27
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Liu H, Mu J, Lee JY. Charge Transport Properties of Stacking Bisindenoanthrazolines: DFT Studies. J Phys Chem B 2011; 115:8409-16. [DOI: 10.1021/jp202745w] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hongguang Liu
- Department of Chemistry, Sungkyunkwan University, Suwon 440-746, Korea
| | - Jinglin Mu
- Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, Institute of Theoretical Chemistry, Shandong University, Jinan 250100, P. R. China
| | - Jin Yong Lee
- Department of Chemistry, Sungkyunkwan University, Suwon 440-746, Korea
- Supercomputing Center, Korea Institute of Science and Technology Information, Yuseong, Daejeon 305-806, Korea
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28
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Malloci G, Cappellini G, Mulas G, Mattoni A. Electronic and optical properties of families of polycyclic aromatic hydrocarbons: A systematic (time-dependent) density functional theory study. Chem Phys 2011. [DOI: 10.1016/j.chemphys.2011.04.013] [Citation(s) in RCA: 120] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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29
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Zhang B, Chen Y, Xu L, Zeng L, He Y, Kang ET, Zhang J. Growing poly(N
-vinylcarbazole) from the surface of graphene oxide via RAFT polymerization. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/pola.24633] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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30
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Onchoke KK. DFT/TD-DFT investigation of optical absorption spectra, electron affinities, and ionization potentials of mono-nitrated benzanthrones. COMPUT THEOR CHEM 2011. [DOI: 10.1016/j.comptc.2010.09.007] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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31
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33
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Samijlenko SP, Yurenko YP, Stepanyugin AV, Hovorun DM. Tautomeric equilibrium of uracil and thymine in model protein-nucleic acid contacts. Spectroscopic and quantum chemical approach. J Phys Chem B 2010; 114:1454-61. [PMID: 20047292 DOI: 10.1021/jp909099a] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
This work deals with tautomeric transformations of uracil (Ura) and thymine (Thy) in their model complexes with the deprotonated carboxylic group. Essential changes in the UV spectra of the bases upon their interaction with NaAc, vanishing signals of both imino protons in (1)H NMR spectra, and a perceptible decrease in intensity of both IR bands, related to the stretching vibrations nu(C=O) of the carbonyl groups, imply involvement of enolic tautomers. Results of quantum chemical calculations of the double complexes of the Ura(Thy) tautomers with CH(3)COO(-) at the MP2/6-311++G(2df,pd)//B3LYP/6-311++G(d,p) level of theory proved to be incompatible with the spectral features: despite the fact that the complexes of the enolic tautomers are much closer in energy to the diketo ones as compared to isolated tautomers, the energy gap between them is such that in tautomeric equilibrium dominate diketo forms. Calculations of triple complexes of the type CH(3)COO(-):Ura(Thy) tautomer:Na(+), taking into account the effect of the Na(+) coordination with tautomers, show that three triple complexes formed by enolic tautomers appeared more stable than those formed by diketo ones. This makes the UV and (1)H NMR data understandable, but the high residual intensity of the nu(C=O) bands in the IR spectra remains unclear. At that ion, Na(+) itself was not able to disturb the tautomeric equilibrium in the coordination complexes of the type Ura(Thy) tautomer:Na(+). To evaluate the DMSO effect, the CPCM solvation model was applied to triple complexes of the Ura tautomers. It appeared that in the solution there is coexistence between the diketo and enolic tautomers in a ratio of 53%:47%. This makes possible reconciliation of our experimental data. The biological significance of high-energy tautomers of nucleotide bases is discussed.
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Affiliation(s)
- Svitlana P Samijlenko
- Department of molecular and quantum biophysics, Institute of Molecular Biology and Genetics, National Academy of Sciences of Ukraine, vul. Zabolotnoho150, Kyiv, 03143, Ukraine
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34
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Lin Y, El-Khouly M, Chen Y, Supur M, Gu L, Li Y, Fukuzumi S. A New Cyanofluorene-Triphenylamine Copolymer: Synthesis and Photoinduced Intramolecular Electron Transfer Processes. Chemistry 2009; 15:10818-24. [DOI: 10.1002/chem.200900752] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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35
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Oxidative damage to DNA: Theoretical determination of ionization potential of deoxyriboguanosine (dG)–deoxyribocytidine (dC) and proton transfer in its cation. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/j.theochem.2009.05.022] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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36
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Feng X, Li Q, Gu J, Cotton FA, Xie Y, Schaefer HF. Perfluorinated Polycyclic Aromatic Hydrocarbons: Anthracene, Phenanthrene, Pyrene, Tetracene, Chrysene, and Triphenylene. J Phys Chem A 2009; 113:887-94. [DOI: 10.1021/jp809110f] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xuejun Feng
- School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China, Department of Chemistry, Beijing Institute of Technology, Beijing 100081, China, Drug Design & Discovery Center, Shanghai Institute of Materia Medica CAS, Shanghai 201203, China, Department of Chemistry, Texas A&M University, College Station, Texas 77843, and Center for Computational Chemistry, University of Georgia, Athens, Georgia 30602
| | - Qianshu Li
- School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China, Department of Chemistry, Beijing Institute of Technology, Beijing 100081, China, Drug Design & Discovery Center, Shanghai Institute of Materia Medica CAS, Shanghai 201203, China, Department of Chemistry, Texas A&M University, College Station, Texas 77843, and Center for Computational Chemistry, University of Georgia, Athens, Georgia 30602
| | - Jiande Gu
- School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China, Department of Chemistry, Beijing Institute of Technology, Beijing 100081, China, Drug Design & Discovery Center, Shanghai Institute of Materia Medica CAS, Shanghai 201203, China, Department of Chemistry, Texas A&M University, College Station, Texas 77843, and Center for Computational Chemistry, University of Georgia, Athens, Georgia 30602
| | - F. Albert Cotton
- School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China, Department of Chemistry, Beijing Institute of Technology, Beijing 100081, China, Drug Design & Discovery Center, Shanghai Institute of Materia Medica CAS, Shanghai 201203, China, Department of Chemistry, Texas A&M University, College Station, Texas 77843, and Center for Computational Chemistry, University of Georgia, Athens, Georgia 30602
| | - Yaoming Xie
- School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China, Department of Chemistry, Beijing Institute of Technology, Beijing 100081, China, Drug Design & Discovery Center, Shanghai Institute of Materia Medica CAS, Shanghai 201203, China, Department of Chemistry, Texas A&M University, College Station, Texas 77843, and Center for Computational Chemistry, University of Georgia, Athens, Georgia 30602
| | - Henry F. Schaefer
- School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China, Department of Chemistry, Beijing Institute of Technology, Beijing 100081, China, Drug Design & Discovery Center, Shanghai Institute of Materia Medica CAS, Shanghai 201203, China, Department of Chemistry, Texas A&M University, College Station, Texas 77843, and Center for Computational Chemistry, University of Georgia, Athens, Georgia 30602
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37
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Puiatti M, Vera DMA, Pierini AB. In search for an optimal methodology to calculate the valence electron affinities of temporary anions. Phys Chem Chem Phys 2009; 11:9013-24. [DOI: 10.1039/b908870a] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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38
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Yan S, Lee SJ, Ko KC, Kang S, Lee JY. Conformational Barrier for Fullerene−Porphyrin−Fullerene Triad. J Phys Chem B 2008; 112:16341-5. [DOI: 10.1021/jp805706v] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shihai Yan
- Department of Chemistry, Institute of Basic Science, Sungkyunkwan University, Suwon, 440-746, Korea, and Supercomputing Center, Korea Institute of Science and Technology Information, 52, Eoeun-dong, Yuseong, Daejeon, Korea 305-806
| | - Sang Joo Lee
- Department of Chemistry, Institute of Basic Science, Sungkyunkwan University, Suwon, 440-746, Korea, and Supercomputing Center, Korea Institute of Science and Technology Information, 52, Eoeun-dong, Yuseong, Daejeon, Korea 305-806
| | - Kyoung Chul Ko
- Department of Chemistry, Institute of Basic Science, Sungkyunkwan University, Suwon, 440-746, Korea, and Supercomputing Center, Korea Institute of Science and Technology Information, 52, Eoeun-dong, Yuseong, Daejeon, Korea 305-806
| | - Sunwoo Kang
- Department of Chemistry, Institute of Basic Science, Sungkyunkwan University, Suwon, 440-746, Korea, and Supercomputing Center, Korea Institute of Science and Technology Information, 52, Eoeun-dong, Yuseong, Daejeon, Korea 305-806
| | - Jin Yong Lee
- Department of Chemistry, Institute of Basic Science, Sungkyunkwan University, Suwon, 440-746, Korea, and Supercomputing Center, Korea Institute of Science and Technology Information, 52, Eoeun-dong, Yuseong, Daejeon, Korea 305-806
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39
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Hajgató B, Deleuze MS, Tozer DJ, De Proft F. A benchmark theoretical study of the electron affinities of benzene and linear acenes. J Chem Phys 2008; 129:084308. [DOI: 10.1063/1.2967182] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
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40
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41
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42
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Todorov PD, Koper C, van Lenthe JH, Jenneskens LW. Gas phase adiabatic electron affinities of cyclopenta-fused polycyclic aromatic hydrocarbons. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2008.01.065] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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43
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Puiatti M, Vera DMA, Pierini AB. Species with negative electron affinity and standard DFT methods. Finding the valence anions. Phys Chem Chem Phys 2008; 10:1394-9. [PMID: 18309394 DOI: 10.1039/b716625g] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Recently, we have shown that traditional bound-electron DFT models are reliable enough to reproduce negative electron affinities (EA) within a few meV, as long as the valence anion state is found, but they seem to fail in predicting the lowest EA when the ground anion state obtained is non-valence, which holds the extra electron in a diffuse orbital around the molecule; here we propose an alternative approach for finding the valence anion state, based on the stabilization exerted by a polar solvent; the methodology yields correct EA values (i.e. beyond the Koopman's theorem approximation) by gradually decreasing the dielectric constant of the medium.
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Affiliation(s)
- Marcelo Puiatti
- INFIQC, Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, 5000 Córdoba, Argentina
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Ando N, Mitsui M, Nakajima A. Comprehensive photoelectron spectroscopic study of anionic clusters of anthracene and its alkyl derivatives: Electronic structures bridging molecules to bulk. J Chem Phys 2007; 127:234305. [DOI: 10.1063/1.2805185] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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45
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Malloci G, Mulas G, Cappellini G, Joblin C. Time-dependent density functional study of the electronic spectra of oligoacenes in the charge states −1, 0, +1, and +2. Chem Phys 2007. [DOI: 10.1016/j.chemphys.2007.07.046] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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46
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47
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Ab initio and TDDFT investigations on charge transfer transition for the o-chloranil/aniline complex in gas phase. Chem Phys Lett 2007. [DOI: 10.1016/j.cplett.2007.08.041] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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48
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Denifl S, Ptasińska S, Sonnweber B, Scheier P, Liu D, Hagelberg F, Mack J, Scott LT, Märk TD. Free-electron attachment to coronene and corannulene in the gas phase. J Chem Phys 2007; 123:104308. [PMID: 16178598 DOI: 10.1063/1.2008947] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Electron attachment to the polyaromatic hydrocarbons coronene and corannulene is studied in the electron energy range of about 0-14 eV using a high-resolution crossed electron-neutral beam setup. The major anions observed are the parent anions peaking at about 0 eV with cross sections of 3.8 x 10(-20) and 1 x 10(-19) m(2), respectively. The only fragment anions formed in coronene and corannulene are the dehydrogenated coronene and corannulene anions. Other anions observed in the negative mass spectra at about 0 eV can be ascribed to impurities of the sample. High-level quantum-mechanical studies are carried out for the determination of electron affinities, hydrogen binding energies, and structures of both molecules. The behavior of coronene and corannulene upon electron attachment is compared with that of other polyaromatic hydrocarbons studied previously.
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Affiliation(s)
- S Denifl
- Institut für Ionenphysik, Leopold Franzens Universität, Innsbruck, Austria.
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49
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Hutchison GR, Ratner MA, Marks TJ. Electronic structure and band gaps in cationic heterocyclic oligomers. Multidimensional analysis of the interplay of heteroatoms, substituents, molecular length, and charge on redox and transparency characteristics. J Phys Chem B 2007; 109:3126-38. [PMID: 16851332 DOI: 10.1021/jp046579v] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Oxidative doping of extended pi-conjugated polymers and oligomers produces dramatic changes in optical and electrical properties, arising from polaron and soliton-derived midgap states. Despite the great importance of such changes for materials properties, far less is known about the cationic polaron states than about the neutral, semiconducting or insulating, undoped materials. The systematic, multifactor computational analysis of oligoheterocycles such as oligothiophenes, oligofurans, and oligopyrroles presented here affords qualitative and quantitative understanding of the interplay among skeletal substitution pattern, electronic structure, and the effective band gap reduction on p-doping. A simple linear relation is derived for predicting p-doped oligomer and polymer effective band gaps based on those of the neutral oligomers; this relationship confirms the effectiveness of a "fixed band" approximation and explains the counterintuitive increase of the effective band gap on p-doping of many small band gap oligomers. The present analysis also suggests new candidates for transparent conductive polymers and predicts limiting behavior of ionization potential, electron affinity, and other properties for various polyheterocyclic systems. The results yield insight into materials constraints in electrochromic polymers as well as on p- and n-type conductors and semiconductors.
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Affiliation(s)
- Geoffrey R Hutchison
- Department of Chemistry and the Materials Research Center, Northwestern University, Evanston, Illinois 60208-3113, USA
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50
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Reddy AR, Fridman-Marueli G, Bendikov M. Kinetic and thermodynamic stability of acenes: Theoretical study of nucleophilic and electrophilic addition. J Org Chem 2007; 72:51-61. [PMID: 17194081 DOI: 10.1021/jo061552o] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
To understand the reactivity of acenes, particularly pentacene, the addition of HCl and water to acenes was studied for the benzene-nonacene series at the B3LYP/6-31G(d) level of theory. Surprisingly, the reactivity of the acenes increases along the series up to hexacene and remains constant from hexacene and above due to the biradical character of the ground state of higher acenes. While the exothermicity of HCl and water additions are very similar, the activation barriers for HCl and water additions differ by a constant factor of ca. 27 kcal/mol. The barrier for the addition of HCl varies from 44 kcal/mol for benzene to 16-18 kcal/mol for pentacene-nonacene, whereas the barrier for the addition of water varies from 71 kcal/mol for benzene to 43-46 kcal/mol for pentacene-nonacene. The transition states (TSs) for the addition of water to acenes are relatively "late" on the reaction coordinate, compared to the "earlier" TSs for the addition of HCl. There is a substantial substituent effect on the energy barriers for these reactions. HCl behaves as an electrophile, with rhoHCl (vs rho p) = -4.48 and -3.39 for anthracenes and pentacenes, respectively, while water behaves as a nucleophile, with rhoHCl (vs rho p) = 2.35 and 1.39 for anthracenes and pentacenes, respectively.
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Affiliation(s)
- A Ravikumar Reddy
- Department of Organic Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel
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