1
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Dudek WM, Ostrowski S, Dobrowolski JC. On Aromaticity of the Aromatic α-Amino Acids and Tuning of the NICS Indices to Find the Aromaticity Order. J Phys Chem A 2022; 126:3433-3444. [PMID: 35617165 PMCID: PMC9189847 DOI: 10.1021/acs.jpca.2c00346] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The NICS aromaticity indices of the rings in flexible phenylalanine (Phe), tryptophan (Trp), tyrosine (Tyr), and histidine (His) chiral molecules were analyzed. These molecules have several dozens of conformers, and their rings are slightly non-planar. Therefore, the population-averaged NICSpav index was defined, and the NICS scans had to be performed with respect to planes found by the least-squares routine. A rule differentiating an obverse and a reverse ring face in aromatic amino acids was formulated. The NICS scan minima corresponding to the obverse and reverse face were unequal, which prompted us to use the term ring face aromaticity/ring face tropicity. It appeared that for Phe, Trp, Tyr, and His, the reverse face has always had higher ring face aromaticity/ring face tropicity than the obverse one. Despite the NICS modifications, uncertainty about the amino acid aromaticity order remained. This motivated us to use the integral INICS index newly proposed by Stanger as well. Then, the following sequence was obtained: Trp(phenyl) > Phe > Trp(pyrrole) > His > Tyr. The juxtaposition of the INICS indices of amino acids with that of some model rings revealed a fair transferability of the values. Finally, analysis of the substituent effect on INICS demonstrated that the aromaticity of Tyr is the lowest due to the strength of the OH group π-electron-donating effect able to perturb enough the ring charge distribution and its magnetic aromaticity. The NICS calculations were executed using the ARONICS program written within the project.
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Affiliation(s)
- Wojciech M Dudek
- Institute of Nuclear Chemistry and Technology, 16 Dorodna Street, 03-195 Warsaw, Poland
| | - Sławomir Ostrowski
- Institute of Nuclear Chemistry and Technology, 16 Dorodna Street, 03-195 Warsaw, Poland
| | - Jan Cz Dobrowolski
- Institute of Nuclear Chemistry and Technology, 16 Dorodna Street, 03-195 Warsaw, Poland
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2
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Orozco-Ic M, Charistos ND, Muñoz-Castro A, Islas R, Sundholm D, Merino G. Core-electron contributions to the molecular magnetic response. Phys Chem Chem Phys 2022; 24:12158-12166. [PMID: 35543541 DOI: 10.1039/d1cp05713h] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Orbital contributions to the magnetic response depend on the method used to compute them. Here, we show that dissecting nuclear magnetic shielding tensors using natural localized molecular orbitals (NLMOs) leads to anomalous core contributions. The arbitrariness of the assignment might significantly affect the interpretation of the magnetic response of nonplanar molecules such as C60 or [14]helicene and the assessment of their aromatic character. We solve this problem by computing the core- and σ-components of the induced magnetic field (and NICS) and the magnetically induced current density by removing the valence electrons (RVE). We estimate the core contributions to the magnetic response by performing calculations on the corresponding highly charged molecules, such as C6H630+ for benzene, using gauge-including atomic orbitals and canonical molecular orbitals (CMOs). The orbital contributions to nuclear magnetic shielding tensors are usually estimated by employing a natural chemical shielding (NCS) analysis in NLMO or CMO bases. The RVE approach shows that the core contribution to the magnetic response is small and localized at the nuclei, contrary to what NCS calculations suggest. This may lead to a completely incorrect interpretation of the magnetic σ-orbital response of nonplanar structures, which may play a major role in the overall magnetic shielding of the system. The RVE approach is thus a simple and inexpensive way to determine the magnetic response of the core- and σ-electrons.
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Affiliation(s)
- Mesías Orozco-Ic
- Department of Chemistry, Faculty of Science, University of Helsinki, P.O. Box 55, A. I. Virtasen aukio 1, FIN-00014 Helsinki, Finland.
| | - Nickolas D Charistos
- Aristotle University of Thessaloniki, Department of Chemistry, Laboratory of Quantum and Computational Chemistry, Thessaloniki, 54 124, Greece
| | - Alvaro Muñoz-Castro
- Grupo de Química Inorgánica y Materiales Moleculares, Facultad de Ingeniería, Universidad Autonoma de Chile, El Llano Subercaseaux 2801, Santiago, Chile
| | - Rafael Islas
- Departamento de Ciencias Químicas, Facultad de Ciencias Exactas, Universidad Andres Bello, Av. República 275, 8370146, Santiago, Chile
| | - Dage Sundholm
- Department of Chemistry, Faculty of Science, University of Helsinki, P.O. Box 55, A. I. Virtasen aukio 1, FIN-00014 Helsinki, Finland.
| | - Gabriel Merino
- Departamento de Física Aplicada, Centro de Investigación y de Estudios Avanzados, Unidad Mérida. Km 6 Antigua Carretera a Progreso. Apdo. Postal 73, Cordemex, 97310, Mérida, Yuc., Mexico.
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3
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Hashimoto S, Kishi R, Tahara K. Theoretical study on the structures, electronic properties, and aromaticity of thia[4]circulenes. NEW J CHEM 2022. [DOI: 10.1039/d2nj04359a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The structures, electronic properties, and aromaticity of a series of thia[4]circulenes are predicted using quantum chemical calculations.
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Affiliation(s)
- Shingo Hashimoto
- Department of Applied Chemistry, School of Science and Technology, Meiji University, 1-1-1 Higashimita, Tama-ku, Kawasaki, Kanagawa 214-8571, Japan
| | - Ryohei Kishi
- Division of Chemical Engineering, Department of Materials Engineering Science, and Research Center for Solar Energy Chemistry (RCSEC), Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan
- Center for Quantum Information and Quantum Biology (QIQB), Institute for Open and Transdisciplinary Research Initiatives, Osaka University, Toyonaka, Osaka 560-8531, Japan
- Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (ICS-OTRI), Osaka University, Suita, Osaka 565-0871, Japan
| | - Kazukuni Tahara
- Department of Applied Chemistry, School of Science and Technology, Meiji University, 1-1-1 Higashimita, Tama-ku, Kawasaki, Kanagawa 214-8571, Japan
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4
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Apriliyanto YB, Battaglia S, Evangelisti S, Faginas-Lago N, Leininger T, Lombardi A. Toward a Generalized Hückel Rule: The Electronic Structure of Carbon Nanocones. J Phys Chem A 2021; 125:9819-9825. [PMID: 34734525 PMCID: PMC8607423 DOI: 10.1021/acs.jpca.1c06402] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this work, we investigate a particular class of carbon nanocones, which we name graphannulenes, and present a generalized Hückel rule (GHR) that predicts the character of their ground state based on simply the three topological indices that uniquely define them. Importantly, this rule applies to both flat and curved systems, encompassing a wide variety of known structures that do not satisfy the "classic" 4n + 2 rule such as coronene, corannulene, and Kekulene. We test this rule at the Hückel level of theory for a large number of systems, including structures that are convex and flat, with a saddle-like geometry, and at the CASSCF level of theory for a selected representative subset. All the performed calculations support the GHR that we propose in this work.
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Affiliation(s)
- Yusuf Bramastya Apriliyanto
- Laboratoire de Chimie et Physique Quantiques-IRSAMC, Université de Toulouse et CNRS, 118, Route de Narbonne, F-31062 Toulouse Cedex, France.,Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi di Perugia, Via Elce di Sotto 8, I-06123 Perugia, Italy
| | - Stefano Battaglia
- Department of Chemistry-BMC, Uppsala University, P.O. Box 576, SE-75123 Uppsala, Sweden
| | - Stefano Evangelisti
- Laboratoire de Chimie et Physique Quantiques-IRSAMC, Université de Toulouse et CNRS, 118, Route de Narbonne, F-31062 Toulouse Cedex, France
| | - Noelia Faginas-Lago
- Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi di Perugia, Via Elce di Sotto 8, I-06123 Perugia, Italy
| | - Thierry Leininger
- Laboratoire de Chimie et Physique Quantiques-IRSAMC, Université de Toulouse et CNRS, 118, Route de Narbonne, F-31062 Toulouse Cedex, France
| | - Andrea Lombardi
- Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi di Perugia, Via Elce di Sotto 8, I-06123 Perugia, Italy
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5
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de Souza
Farias SA, da Costa KS, Martins JB. Analysis of Conformational, Structural, Magnetic, and Electronic Properties Related to Antioxidant Activity: Revisiting Flavan, Anthocyanidin, Flavanone, Flavonol, Isoflavone, Flavone, and Flavan-3-ol. ACS OMEGA 2021; 6:8908-8918. [PMID: 33842761 PMCID: PMC8028018 DOI: 10.1021/acsomega.0c06156] [Citation(s) in RCA: 36] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Accepted: 03/01/2021] [Indexed: 06/03/2023]
Abstract
Understanding the antioxidant activity of flavonoids is important to investigate their biological activities as well as to design novel molecules with low toxicity and high activity. Aromaticity is a chemical property found in cyclic structures that plays an important role in their stability and reactivity, and its investigation can help us to understand the antioxidant activity of some heterocyclic compounds. In the present study, we applied the density functional theory (DFT) to investigate the properties of seven flavonoid structures with well-reported antioxidant activity: flavan, anthocyanidin, flavanone, flavonol, isoflavone, flavone, and flavan-3-ol. Conformational, structural, magnetic, and electronic analyses were performed using nuclear magnetic resonance, ionization potentials, electron affinity, bond dissociation energy, proton affinity, frontier molecular orbitals (highest occupied molecular orbital (HOMO)/lowest unoccupied molecular orbital (LUMO)), and aromaticity through nucleus-independent chemical shifts to analyze these seven flavonoid structures. We revised the influence of hydroxyl groups on the properties of flavonoids and also investigated the influence of the aromaticity of these seven flavonoids on the antioxidant activity.
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Affiliation(s)
- Sergio Antônio de Souza
Farias
- Laboratory
of Molecular Modeling, Institute of Educational Sciences, Federal University of Western Pará, 68040-255 Santarém, Pará, Brazil
| | - Kauê Santana da Costa
- Institute
of Biodiversity, Federal University of Western
Pará, 68040-255 Santarém, Pará, Brazil
| | - João B.
L. Martins
- Laboratory
of Computational Chemistry, Institute of Chemistry, University of Brasilia, 4478 Brasília, Distrito
Federal, Brazil
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6
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Yang K, Zaffran J, Yang B. Fast prediction of oxygen reduction reaction activity on carbon nanotubes with a localized geometric descriptor. Phys Chem Chem Phys 2020; 22:890-895. [DOI: 10.1039/c9cp04885e] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
By using the pyramidalization angle as a localized geometric descriptor for oxygen reduction reaction (ORR) activity of carbon nanotubes (CNTs), we show the ORR activity of these systems can be readily predicted with mere structural optimization of CNTs.
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Affiliation(s)
- Kunran Yang
- School of Physical Science and Technology
- ShanghaiTech University
- Shanghai 201210
- China
| | - Jeremie Zaffran
- School of Physical Science and Technology
- ShanghaiTech University
- Shanghai 201210
- China
| | - Bo Yang
- School of Physical Science and Technology
- ShanghaiTech University
- Shanghai 201210
- China
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7
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Orozco‐Ic M, Barroso J, Charistos ND, Muñoz‐Castro A, Merino G. Consequences of Curvature on Induced Magnetic Field: The Case of Helicenes. Chemistry 2019; 26:326-330. [DOI: 10.1002/chem.201904390] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Indexed: 11/11/2022]
Affiliation(s)
- Mesías Orozco‐Ic
- Departamento de Física Aplicada Centro de Investigación y, de Estudios Avanzados, Unidad Mérida Mérida Yucatán México
| | - Jorge Barroso
- Departamento de Física Aplicada Centro de Investigación y, de Estudios Avanzados, Unidad Mérida Mérida Yucatán México
| | - Nickolas D. Charistos
- Department of Chemistry, Laboratory of Quantum and Computational Chemistry Aristotle University of Thessaloniki Thessaloniki 54 124 Greece
| | - Alvaro Muñoz‐Castro
- Laboratorio de Química Inorgánica y Materiales Moleculares Facultad de Ingeniería Universidad Autónoma de Chile Santiago Chile
| | - Gabriel Merino
- Departamento de Física Aplicada Centro de Investigación y, de Estudios Avanzados, Unidad Mérida Mérida Yucatán México
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8
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Kupka T, Gajda Ł, Stobiński L, Kołodziej Ł, Mnich A, Buczek A, Broda MA. Local aromaticity mapping in the vicinity of planar and nonplanar molecules. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2019; 57:359-372. [PMID: 31034627 DOI: 10.1002/mrc.4880] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Accepted: 04/23/2019] [Indexed: 06/09/2023]
Abstract
We report on nucleus-independent magnetic shielding (NICS) scans over the centers of six- and five-membered rings in selected metal phthalocyanines (MPc) and fullerene C60 for more accurate characterization of local aromaticity in these compounds. Detailed tests were conducted on model aromatic molecules including benzene, pyrrole, indole, isoindole, and carbazole and subsequently applied to H2 Pc, ZnPc, Al(OH)Pc, and CuPc. Similar behavior of three selected magnetic probes, Bq, 3 He, and 7 Li+ , approaching perpendicularly the ring centers, was observed. For better visualization of shielding zone over the centers of aromatic rings, we introduced a simple mathematical procedure: the first and second derivatives of scan curves with respect to magnetic probe position enabled their additional examination. It allowed an easier localization of curve minimum and discrimination between areas in space varying by the magnetic field magnitude and to illustrate local aromaticity of two different kinds of rings in MPc with better resolution. Our results supported earlier reports on very low aromaticity indexes of pyrrole ring incorporated into MPc and significant aromaticity of the central macrocycle. No direct dependence between harmonic oscillator model of aromaticity and NICS was observed. Instead, a correlation between position of scan curve minimum and its magnitude were observed. In addition, the NICS values and 3 He chemical shifts in the middle of neutral C60 and C606- anion agreed well with the reported experimental NMR values for He@C60 and He@C606- .
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Affiliation(s)
- Teobald Kupka
- Faculty of Chemistry, University of Opole, Opole, Poland
| | - Łukasz Gajda
- Faculty of Chemistry, University of Opole, Opole, Poland
| | - Leszek Stobiński
- Faculty of Process and Chemical Engineering, Warsaw University of Technology, 1, Waryńskiego Street, 00-645, Warsaw, Poland
- nanoMAT Ltd., Waryńskiego 1 (FL. 4, RM. 401), 00-645, Warsaw, Poland
| | | | - Adrianna Mnich
- Faculty of Chemistry, University of Opole, Opole, Poland
| | - Aneta Buczek
- Faculty of Chemistry, University of Opole, Opole, Poland
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9
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Saha M, Bao YH, Zhou C. A Diindole-fused Corannulene Imide Derivative: Synthesis and Properties. CHEM LETT 2018. [DOI: 10.1246/cl.180680] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Mithu Saha
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P. R. China
| | - Yue-Hua Bao
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P. R. China
| | - Cen Zhou
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P. R. China
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10
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Wang Q, Hu P, Tanaka T, Gopalakrishna TY, Herng TS, Phan H, Zeng W, Ding J, Osuka A, Chi C, Siegel J, Wu J. Curved π-conjugated corannulene dimer diradicaloids. Chem Sci 2018; 9:5100-5105. [PMID: 29938041 PMCID: PMC5994875 DOI: 10.1039/c8sc01388h] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Accepted: 05/12/2018] [Indexed: 11/21/2022] Open
Abstract
So far, most reported open-shell singlet diradicaloids are based on planar π-conjugated molecules. Herein, we report the bridged corannulene dimer diradicaloids, Cor-D1 and Cor-D2, both showing a three-dimensional curved π-conjugated structure. Cor-D1 has a small diradical character (y0 = 5.4%) and behaves more like a closed-shell quinoidal compound at room temperature, while Cor-D2 is a typical open-shell diradicaloid with a larger diradical character (y0 = 16.9%). Both compounds exhibited paramagnetic activity at elevated temperatures, with a singlet-triplet energy gap (ΔES-T) of -8.4 and -3.0 kcal mol-1, respectively. X-ray crystallographic analysis revealed that both molecules have a dumbbell-shaped geometry, with the two terminal corannulene bowls bent to opposite directions. The spin is largely delocalized onto the two bowls in Cor-D2 and there are multiple [CH···π] interactions between the neighboring bowls. Chemical oxidation/reduction to their respective dications/dianions results in global aromaticity with [4n + 2] π-electrons delocalized through the periphery of the whole framework.
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Affiliation(s)
- Qing Wang
- Department of Chemistry , National University of Singapore , 3 Science Drive 3 , 117543 , Singapore . ;
| | - Pan Hu
- Department of Chemistry , National University of Singapore , 3 Science Drive 3 , 117543 , Singapore . ;
| | - Takayuki Tanaka
- Department of Chemistry , Graduate School of Science , Kyoto University , Sakyo-ku , Kyoto 606-8502 , Japan
| | | | - Tun Seng Herng
- Department of Materials Science and Engineering , National University of Singapore , 119260 , Singapore
| | - Hoa Phan
- Department of Chemistry , National University of Singapore , 3 Science Drive 3 , 117543 , Singapore . ;
| | - Wangdong Zeng
- Department of Chemistry , National University of Singapore , 3 Science Drive 3 , 117543 , Singapore . ;
| | - Jun Ding
- Department of Materials Science and Engineering , National University of Singapore , 119260 , Singapore
| | - Atsuhiro Osuka
- Department of Chemistry , Graduate School of Science , Kyoto University , Sakyo-ku , Kyoto 606-8502 , Japan
| | - Chunyan Chi
- Department of Chemistry , National University of Singapore , 3 Science Drive 3 , 117543 , Singapore . ;
| | - Jay Siegel
- Health Science Platform , Tianjin University , 92 Weijin Road, Nankai District , Tianjin , 300072 , P. R. China .
| | - Jishan Wu
- Department of Chemistry , National University of Singapore , 3 Science Drive 3 , 117543 , Singapore . ;
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11
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Valadbeigi Y. Comparison of effects of charge delocalization and π-electron delocalization on the stability of monocyclic compounds. J Mol Graph Model 2018; 80:104-112. [PMID: 29328991 DOI: 10.1016/j.jmgm.2017.12.026] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Revised: 12/29/2017] [Accepted: 12/30/2017] [Indexed: 11/17/2022]
Abstract
Aromaticities and stabilities of ortho, meta, and para isomers of some derivatives of benzene, C5H5- and C7H7+ were studied and compared basis on the NICS index and their relative energies. For the benzene and C7H7+ derivatives, the ortho isomers with less stability were more aromatic. This discrepancy was also observed for the molecules with conjugated and non-conjugated π-electrons. However, for the charged conjugated systems, the structures with delocalized charge were more stable. Effect of electron withdrawing (EWGs) and electron donating groups (EDGs) on the electron delocalization and stability of the neutral and charged molecules was investigated. It was observed that the EWDs and EDGs change the stability trend of the neutral systems, while in the case of charged molecules, the isomers with delocalized charge were more stable regardless of the type of substituents. Although both π-electron delocalization and charge delocalization stabilize the aromatic and conjugated systems, effect of charge delocalization on the stability is more than that of π-electron delocalization.
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Affiliation(s)
- Younes Valadbeigi
- Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran, Iran.
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12
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Armaković S, Armaković SJ, Tomić BT, Pillai RR, Panicker CY. Adsorption properties of graphene towards the ephedrine – A frequently used molecule in sport. COMPUT THEOR CHEM 2018. [DOI: 10.1016/j.comptc.2017.12.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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13
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Reisi-Vanani A, Shamsali F. Influence of nitrogen doping in sumanene framework toward hydrogen storage: A computational study. J Mol Graph Model 2017; 76:475-487. [PMID: 28802213 DOI: 10.1016/j.jmgm.2017.07.021] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Revised: 07/18/2017] [Accepted: 07/19/2017] [Indexed: 11/25/2022]
Abstract
Two conditions are important to obtain appropriate substances for hydrogen storage; high surface area and fitting binding energy (BE). Doping is a key strategy that improves BE. We investigated hydrogen adsorption onto twenty six nitrogen disubstituted isomers of sumanene (C19N2H12) by MP2/6-311++G(d,p)//B3LYP/6-31+G(d) and M06-2X/6-31+G(d) levels of theory. Effect of nitrogen doping in different positions of sumanene was checked. To obtain better BE, basis set superposition error (BSSE) and zero point energy (ZPE) corrections were used. Anticipating of adsorption sites and extra details about adsorption process was done by molecular electrostatic potential (MEP) surfaces. Various types of density of state (DOS) diagrams such as total DOS (TDOS), projected DOS (PDOS) and overlap population DOS (OPDOS) and natural bond orbital (NBO) analysis were used to find better insight on the adsorption properties. In addition of temperature depending of the BE, HOMO-LUMO gap (HLG), dipole moment, reactivity and stability, bowl depth and natural population analysis (NPA) of the isomers were studied. A physisorption mechanism for adsorption was proposed and a trivial change was seen. Place of nitrogen atoms in sumanene frame causes to binding energy increases or decreases compared with pristine sumanene. The best and the worst isomers and category of isomers were suggested.
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Affiliation(s)
- Adel Reisi-Vanani
- Department of Physical Chemistry, Faculty of Chemistry, University of Kashan, Kashan, Iran.
| | - Fatemeh Shamsali
- Department of Physical Chemistry, Faculty of Chemistry, University of Kashan, Kashan, Iran
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14
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An insight on the aromatic changes in closed shell icosagen, tetrel, and pnictogen phenalenyl derivatives. Struct Chem 2016. [DOI: 10.1007/s11224-016-0882-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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15
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Setiawan D, Kraka E, Cremer D. Quantitative Assessment of Aromaticity and Antiaromaticity Utilizing Vibrational Spectroscopy. J Org Chem 2016; 81:9669-9686. [DOI: 10.1021/acs.joc.6b01761] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Dani Setiawan
- Computational and Theoretical
Chemistry Group (CATCO), Department of Chemistry, Southern Methodist University, 3215 Daniel Ave., Dallas, Texas 75275-0314, United States
| | - Elfi Kraka
- Computational and Theoretical
Chemistry Group (CATCO), Department of Chemistry, Southern Methodist University, 3215 Daniel Ave., Dallas, Texas 75275-0314, United States
| | - Dieter Cremer
- Computational and Theoretical
Chemistry Group (CATCO), Department of Chemistry, Southern Methodist University, 3215 Daniel Ave., Dallas, Texas 75275-0314, United States
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16
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Casabianca LB. Effect of Curvature on Carbon Chemical Shielding in Extended Carbon Systems. J Phys Chem A 2016; 120:7011-9. [DOI: 10.1021/acs.jpca.6b05560] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Leah B. Casabianca
- Department of Chemistry, Clemson University, Clemson, South Carolina 29634-0973, United States
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17
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Aromatic changes in isoelectronic derivatives of phenalenyl radicals by central carbon replacement. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.06.050] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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18
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Reisi-Vanani A, Hamadanian M, Kokhdan SN. Functionalization of the sumanene by nitrous oxide: A mechanistic study. COMPUT THEOR CHEM 2016. [DOI: 10.1016/j.comptc.2016.03.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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19
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Abstract
The NICS(1) magnetic aromaticity index is split into NICS(1) and NICS(−1) indices when the points 1 Å above and below the ring center are inequivalent by symmetry. The two indices characterize the aromaticity of the two ring faces rather than the ring itself.
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Affiliation(s)
- Jan Cz. Dobrowolski
- Institute of Chemistry and Nuclear Technology
- 03-195 Warsaw
- Poland
- National Medicines Institute
- 00-725 Warsaw
| | - Piotr F. J. Lipiński
- Department of Neuropeptides
- Mossakowski Medical Research Centre Polish Academy of Sciences
- 02-106 Warszawa
- Poland
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