151
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Zhao L, von Hopffgarten M, Andrada DM, Frenking G. Energy decomposition analysis. WILEY INTERDISCIPLINARY REVIEWS-COMPUTATIONAL MOLECULAR SCIENCE 2017. [DOI: 10.1002/wcms.1345] [Citation(s) in RCA: 226] [Impact Index Per Article: 32.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Lili Zhao
- Institute of Advanced Synthesis, School of Chemistry and Molecular EngineeringJiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University Nanjing China
| | | | | | - Gernot Frenking
- Institute of Advanced Synthesis, School of Chemistry and Molecular EngineeringJiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University Nanjing China
- Fachbereich ChemiePhilipps‐Universität Marburg Marburg Germany
- Donostia International Physics Center (DIPC) Donostia Spain
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152
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Torrent-Sucarrat M, Navarro S, Cossío FP, Anglada JM, Luis JM. Relevance of the DFT method to study expanded porphyrins with different topologies. J Comput Chem 2017; 38:2819-2828. [DOI: 10.1002/jcc.25074] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2017] [Revised: 08/03/2017] [Accepted: 09/07/2017] [Indexed: 12/14/2022]
Affiliation(s)
- Miquel Torrent-Sucarrat
- Department of Organic Chemistry I; Universidad del País Vasco - Euskal Herriko Unibertsitatea (UPV/EHU) and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Manuel Lardizabal Ibilbidea 3; San Sebastian Donostia 20018 Spain
- Donostia International Physics Center (DIPC), Manuel Lardizabal Ibilbidea 4; San Sebastián/Donostia 20018 Spain
- Ikerbasque, Basque Foundation for Science, María Díaz de Haro, 3, 6°; Bilbao 48013 Spain
| | - Sara Navarro
- Institut de Química Computacional i Catàlisi and Departament de Química, Universitat de Girona; Girona Catalonia E-17071 Spain
| | - Fernando P. Cossío
- Department of Organic Chemistry I; Universidad del País Vasco - Euskal Herriko Unibertsitatea (UPV/EHU) and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Manuel Lardizabal Ibilbidea 3; San Sebastian Donostia 20018 Spain
- Donostia International Physics Center (DIPC), Manuel Lardizabal Ibilbidea 4; San Sebastián/Donostia 20018 Spain
| | - Josep M. Anglada
- Departament de Química Biològica i Modelització Molecular; Institut de Química Avançada de Catalunya (IQAC-CSIC), c/Jordi Girona 18; Barcelona E-08034 Spain
| | - Josep M. Luis
- Institut de Química Computacional i Catàlisi and Departament de Química, Universitat de Girona; Girona Catalonia E-17071 Spain
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153
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Abstract
Silicene is the silicon equivalent of graphene, which is composed of a honeycomb carbon structure with one atom thickness and has attractive characteristics of a perfect two-dimensional π-conjugated sheet. However, unlike flat and highly stable graphene, silicene is relatively sticky and thus unstable due to its puckered or crinkled structure. Flatness is important for stability, and to obtain perfect π-conjugation, electron-donating atoms and molecules should not interact with the π electrons. The structural differences between silicene and graphene result from the differences in their building blocks, flat benzene and chair-form hexasilabenzene. It is crucial to design flat building blocks for silicene with no interactions between the electron donor and π-orbitals. Here, we report the successful design of such building blocks with the aid of density functional theory calculations. Our fundamental concept is to attach substituents that have sp-hybrid orbitals and act as electron donors in a manner that it does not interact with the π orbitals. The honeycomb silicon molecule with BeH at the edge designed according to our concept, clearly shows the same structural, charge distribution and molecular orbital characteristics as the corresponding carbon-based molecule.
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154
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Fujii S, Marqués-González S, Shin JY, Shinokubo H, Masuda T, Nishino T, Arasu NP, Vázquez H, Kiguchi M. Highly-conducting molecular circuits based on antiaromaticity. Nat Commun 2017; 8:15984. [PMID: 28722006 PMCID: PMC5524926 DOI: 10.1038/ncomms15984] [Citation(s) in RCA: 77] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Accepted: 05/17/2017] [Indexed: 12/13/2022] Open
Abstract
Aromaticity is a fundamental concept in chemistry. It is described by Hückel’s rule that states that a cyclic planar π-system is aromatic when it shares 4n+2 π-electrons and antiaromatic when it possesses 4n π-electrons. Antiaromatic compounds are predicted to exhibit remarkable charge transport properties and high redox activities. However, it has so far only been possible to measure compounds with reduced aromaticity but not antiaromatic species due to their energetic instability. Here, we address these issues by investigating the single-molecule charge transport properties of a genuinely antiaromatic compound, showing that antiaromaticity results in an order of magnitude increase in conductance compared with the aromatic counterpart. Single-molecule current–voltage measurements and ab initio transport calculations reveal that this results from a reduced energy gap and a frontier molecular resonance closer to the Fermi level in the antiaromatic species. The conductance of the antiaromatic complex is further modulated electrochemically, demonstrating its potential as a high-conductance transistor. Antiaromatic molecules are predicted to have unusual charge transport properties, but are notoriously unstable and reactive. Here, the authors successfully fabricate an antiaromatic molecular circuit, based on a macrocyclic complex, displaying much higher conductance than its aromatic counterpart.
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Affiliation(s)
- Shintaro Fujii
- Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Santiago Marqués-González
- Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Ji-Young Shin
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Aichi 464-8603, Japan
| | - Hiroshi Shinokubo
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Aichi 464-8603, Japan
| | - Takuya Masuda
- Global Research Center for Environment and Energy Based on Nanomaterials Science (GREEN), National Institute for Materials Science (NIMS), Tsukuba 305-0044, Japan
| | - Tomoaki Nishino
- Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Narendra P Arasu
- Institute of Physics, Academy of Sciences of the Czech Republic, Cukrovarnicka 10, Prague CZ-162 00, Czech Republic
| | - Héctor Vázquez
- Institute of Physics, Academy of Sciences of the Czech Republic, Cukrovarnicka 10, Prague CZ-162 00, Czech Republic
| | - Manabu Kiguchi
- Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8551, Japan
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155
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156
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Vignoni M, Walalawela N, Bonesi SM, Greer A, Thomas AH. Lipophilic Decyl Chain–Pterin Conjugates with Sensitizer Properties. Mol Pharm 2017; 15:798-807. [DOI: 10.1021/acs.molpharmaceut.7b00136] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Mariana Vignoni
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata (UNLP), CCT La Plata-CONICET, Casilla de Correo 16, Sucursal 4, 1900 La Plata, Argentina
- Department of Chemistry, Brooklyn College, City University of New York, Brooklyn, New York 11210, United States
| | - Niluksha Walalawela
- Department of Chemistry, Brooklyn College, City University of New York, Brooklyn, New York 11210, United States
- Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, New York 10016, United States
| | - Sergio M. Bonesi
- CIHIDECAR-CONICET, Departamento de Química Orgánica, FCEyN, Universidad de Buenos Aires, Pabellón 2, 3er Piso, Ciudad Universitaria, Buenos Aires, Argentina
| | - Alexander Greer
- Department of Chemistry, Brooklyn College, City University of New York, Brooklyn, New York 11210, United States
- Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, New York 10016, United States
| | - Andrés H. Thomas
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata (UNLP), CCT La Plata-CONICET, Casilla de Correo 16, Sucursal 4, 1900 La Plata, Argentina
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157
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Zhang H, Jiang X, Wu W, Mo Y. Electron conjugation versus π-π repulsion in substituted benzenes: why the carbon-nitrogen bond in nitrobenzene is longer than in aniline. Phys Chem Chem Phys 2017; 18:11821-8. [PMID: 26852720 DOI: 10.1039/c6cp00471g] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Gas-phase electron diffraction experiments show that the C-N bond in aniline (1.407 Å) is significantly shorter than in nitrobenzene (1.486 Å). It is known that the amino group is electron-donating and the nitro group is electron-withdrawing, and both substitution groups can effectively conjugate with benzene. Thus, it is puzzling why the C-N bond in nitrobenzene is even longer than the single C-N bond in methylamine (1.472 Å). In this work, we performed computations by strictly localizing the π electrons with the block-localized wavefunction (BLW) method, which is a variant of ab initio valence bond theory. Geometry optimizations of electron-localized states, where the conjugation over the C-N bond is quenched, show that the conjugation in nitrobenzene is only half of the conjugation in aniline. But even in optimal electron-localized states, the C-N bond in nitrobenzene is still 0.074 Å longer than in aniline. As a consequence, it is indeed not the π conjugation which is responsible for the disparity of the C-N bond distances in these systems. Instead, we demonstrated that the π-π repulsion, which is contributed by both Pauli exchange and electrostatic interaction, plays the key role in this "abnormal" behavior. Notably, the π resonance within the nitro group generates a considerable dipole, which repels the π electrons in the benzene ring. The deactivation of the resonance within the nitro group significantly shortens the C-N bond by 0.06 Å. The unfavorable π-π electrostatic repulsion is further exemplified by N2O4. In fact, the destabilizing π-π repulsion is ubiquitous but largely neglected in conjugated systems where only the stabilizing conjugation is the focus. Experimental phenomena such as the C-N bond distances in aniline and nitrobenzene result from the balance of both stabilizing and destabilizing forces.
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Affiliation(s)
- Huaiyu Zhang
- The State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, China and Department of Chemistry, Western Michigan University, Kalamazoo, Michigan 49008, USA.
| | - Xiaoyu Jiang
- College of Ecological Environment and Urban Construction, Fujian University of Technology, Fuzhou 350108, China
| | - Wei Wu
- The State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, China
| | - Yirong Mo
- Department of Chemistry, Western Michigan University, Kalamazoo, Michigan 49008, USA.
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158
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Kumar A, Duran M, Solà M. Is coronene better described by Clar's aromatic π-sextet model or by the AdNDP representation? J Comput Chem 2017; 38:1606-1611. [DOI: 10.1002/jcc.24801] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2017] [Revised: 03/15/2017] [Accepted: 03/16/2017] [Indexed: 01/19/2023]
Affiliation(s)
- Anand Kumar
- Department of Chemistry; Indian Institute of Science Education and Research; Pune, Dr. Homi Bhabha Road Pune Maharashtra 411008 India
- Institut de Química Computacional i Catàlisi (IQCC), Department de Química; Universitat de Girona; c/Maria Aurèlia Capmany 6 Girona Catalonia 17003 Spain
| | - Miquel Duran
- Institut de Química Computacional i Catàlisi (IQCC), Department de Química; Universitat de Girona; c/Maria Aurèlia Capmany 6 Girona Catalonia 17003 Spain
| | - Miquel Solà
- Institut de Química Computacional i Catàlisi (IQCC), Department de Química; Universitat de Girona; c/Maria Aurèlia Capmany 6 Girona Catalonia 17003 Spain
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159
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López-Carballeira D, Ruipérez F. Singlet open-shell diradical nature and redox properties of conjugated carbonyls: a quantum chemical study. Theor Chem Acc 2017. [DOI: 10.1007/s00214-017-2061-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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160
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Laib S, Ouddai N. Intra-ring haptotropic rearrangements of Mn(CO)3 in fluorenyl ligands. JOURNAL OF SAUDI CHEMICAL SOCIETY 2017. [DOI: 10.1016/j.jscs.2015.05.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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161
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Zhao L, Grande-Aztatzi R, Foroutan-Nejad C, Ugalde JM, Frenking G. Aromaticity, the Hückel 4 n+2 Rule and Magnetic Current. ChemistrySelect 2017. [DOI: 10.1002/slct.201602080] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Lili Zhao
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials; Nanjing Tech University; Nanjing 211816 China
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein-Strasse 4 35043 Marburg Germany
| | - Rafael Grande-Aztatzi
- Kimika Fakultatea; Euskal Herriko Unibertsitatea (UPV/EHU) and Donostia International Physics Center (DIPC), P.K. 1072; 20080 Donostia, Euskadi Spain
| | - Cina Foroutan-Nejad
- CEITEC-Central European Institute of Technology; Masaryk University, Kamenice 5/A4; 62500 Brno Czech Republic
| | - Jesus M. Ugalde
- Kimika Fakultatea; Euskal Herriko Unibertsitatea (UPV/EHU) and Donostia International Physics Center (DIPC), P.K. 1072; 20080 Donostia, Euskadi Spain
| | - Gernot Frenking
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials; Nanjing Tech University; Nanjing 211816 China
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein-Strasse 4 35043 Marburg Germany
- Kimika Fakultatea; Euskal Herriko Unibertsitatea (UPV/EHU) and Donostia International Physics Center (DIPC), P.K. 1072; 20080 Donostia, Euskadi Spain
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162
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Borthakur R, Kar S, Barik SK, Bhattacharya S, Kundu G, Varghese B, Ghosh S. Synthesis, Chemistry, and Electronic Structures of Group 9 Metallaboranes. Inorg Chem 2017; 56:1524-1533. [DOI: 10.1021/acs.inorgchem.6b02626] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Rosmita Borthakur
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
| | - Sourav Kar
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
| | - Subrat Kumar Barik
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
| | - Somnath Bhattacharya
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
| | - Gargi Kundu
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
| | - Babu Varghese
- Sophisticated Analytical Instrument Facility, Indian Institute of Technology Madras, Chennai 60036, India
| | - Sundargopal Ghosh
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
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163
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Villar López R, Nieto Faza O, Matito E, López CS. Cycloreversion of the CO 2 trimer: a paradigmatic pseudopericyclic [2 + 2 + 2] cycloaddition reaction. Org Biomol Chem 2017; 15:435-441. [PMID: 27924328 DOI: 10.1039/c6ob02288j] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Very recently, the CO2 trimer has been experimentally synthesized, isolated and characterized. This process opens new ways for the withdrawal and storage of this greenhouse gas. The trimer is reported to be stable up to -40 °C, with a lifetime of about 40 min at this temperature. At these or under harsher thermal conditions it reverts to the three monomers. The mechanism of this reaction has been theoretically studied and the electronic character of the associated transition state has been analyzed from a variety of perspectives (energetic, magnetic, electron localization and delocalization functions) which indicate that it has paradigmatic pseudopericyclic character. To allow for a comparative study, the isoelectronic fragmentations of cyclohexane into three units of ethylene and of benzene into three units of acetylene have been included in this work. The study of a similar series of formally forbidden-four-centered [2 + 2] cycloreversions confirmed the pseudopericyclic nature of these reactions when the CO2 dimer or trimer is involved.
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Affiliation(s)
- Roberto Villar López
- Departamento de Química Orgánica, Facultad de Ciencias, Campus Universitario, Ourense, Spain
| | - Olalla Nieto Faza
- Departamento de Química Orgánica, Facultad de Ciencias, Campus Universitario, Ourense, Spain
| | - Eduard Matito
- Kimika Fakultatea, Euskal Herriko Unibertsitatea UPV/EHU, Donostia International Physics Center (DIPC), P.K. 1072, 20080 Donostia, Spain and Ikerbasque, Basque Foundation for Science, Bilbao, Spain.
| | - Carlos Silva López
- Departamento de Química Orgánica, Facultad de Química, Universidad de Vigo, Campus Lagoas-Marcosende, 36310, Vigo, Spain.
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164
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Dixit VA, Goundry WRF, Tomasi S. CC/B–N substitution in five membered heterocycles. A computational analysis. NEW J CHEM 2017. [DOI: 10.1039/c7nj00950j] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Novel five-membered azaboroles are aromatic, stable under neutral conditions, isomer stabilization energy is explained using σ-bond and aromatic stabilization energies.
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Affiliation(s)
- Vaibhav A. Dixit
- Department of Pharmaceutical Chemistry
- School of Pharmacy & Technology Management (SPTM)
- Shri Vile Parle Kelavani Mandal's (SVKM's)
- Narsee Monjee Institute of Management Studies (NMIMS)
- Mukesh Patel Technology Park
| | | | - Simone Tomasi
- Global Medicines Development
- Process Research and Development
- Macclesfield
- UK
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165
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Shahamirian M, Kiani S, Jorsaraei Talar A, Khodabakhshi S. Functionalized Nano Graphene Platelets as Green Catalyst to Synthesize New and Known Benzoyl-1,4-diazanaphthalene and Study of Their Local Aromaticity. Polycycl Aromat Compd 2017. [DOI: 10.1080/10406638.2015.1099552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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166
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Mok NY, Brown N. Applications of Systematic Molecular Scaffold Enumeration to Enrich Structure-Activity Relationship Information. J Chem Inf Model 2016; 57:27-35. [PMID: 27990817 PMCID: PMC6152611 DOI: 10.1021/acs.jcim.6b00386] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
![]()
Establishing
structure–activity relationships (SARs) in
hit identification during early stage drug discovery is important
in accelerating hit confirmation and expansion. We describe the development
of EnCore, a systematic molecular scaffold enumeration
protocol using single atom mutations, to enhance the application of
objective scaffold definitions and to enrich SAR information from
analysis of high-throughput screening output. A list of 43 literature
medicinal chemistry compound series, each containing a minimum of
100 compounds, published in the Journal of Medicinal Chemistry was collated to validate the protocol. Analysis using the top representative
Level 1 scaffolds this list of literature compound series demonstrated
that EnCore could mimic the scaffold exploration
conducted when establishing SAR. When EnCore was
applied to analyze an HTS library containing over 200 000 compounds,
we observed that over 70% of the molecular scaffolds matched extant
scaffolds within the library after enumeration. In particular, over
60% of the singleton scaffolds with only one representative compound
were found to have structurally related compounds after enumeration.
These results illustrate the potential of EnCore to
enrich SAR information. A case study using literature cyclooxygenase-2
inhibitors further demonstrates the advantage of EnCore application in establishing SAR from structurally related scaffolds. EnCore complements literature enumeration methods in enabling
changes to the physicochemical properties of molecular scaffolds and
structural modifications to aliphatic rings and linkers. The enumerated
scaffold clusters generated would constitute a comprehensive collection
of scaffolds for scaffold morphing and hopping.
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Affiliation(s)
- N Yi Mok
- Cancer Research UK Cancer Therapeutics Unit, Division of Cancer Therapeutics, The Institute of Cancer Research , London, SM2 5NG, U.K
| | - Nathan Brown
- Cancer Research UK Cancer Therapeutics Unit, Division of Cancer Therapeutics, The Institute of Cancer Research , London, SM2 5NG, U.K
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167
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Affiliation(s)
- Gonzalo Anguera
- Grup d’Enginyeria
de Materials, Institut Químic de Sarrià, Universitat Ramon Llull, Via Augusta 390, 08017 Barcelona, Spain
| | - David Sánchez-García
- Grup d’Enginyeria
de Materials, Institut Químic de Sarrià, Universitat Ramon Llull, Via Augusta 390, 08017 Barcelona, Spain
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168
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Yuan J, Long X, Zhang C. Influence of N-Oxide Introduction on the Stability of Nitrogen-Rich Heteroaromatic Rings: A Quantum Chemical Study. J Phys Chem A 2016; 120:9446-9457. [DOI: 10.1021/acs.jpca.6b08852] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jia Yuan
- Institute of Chemical Materials, China Academy of Engineering Physics (CAEP), P.O. Box 919-327, Mianyang, Sichuan 621900, China
| | - Xinping Long
- Institute of Chemical Materials, China Academy of Engineering Physics (CAEP), P.O. Box 919-327, Mianyang, Sichuan 621900, China
| | - Chaoyang Zhang
- Institute of Chemical Materials, China Academy of Engineering Physics (CAEP), P.O. Box 919-327, Mianyang, Sichuan 621900, China
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169
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Domingo LR, Ríos-Gutiérrez M, Chamorro E, Pérez P. Aromaticity in Pericyclic Transition State Structures? A Critical Rationalisation Based on the Topological Analysis of Electron Density. ChemistrySelect 2016. [DOI: 10.1002/slct.201601384] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Luis R. Domingo
- Department of Organic Chemistry; University of Valencia; Dr. Moliner 50 E-46100 Burjassot Valencia Spain
| | - Mar Ríos-Gutiérrez
- Department of Organic Chemistry; University of Valencia; Dr. Moliner 50 E-46100 Burjassot Valencia Spain
| | - Eduardo Chamorro
- Universidad Andres Bello; Facultad de Ciencias Exactas; Departamento de Ciencias Químicas, Millennium Nucleus Chemical Processes and Catalysis (CPC); Av. República 498 8370146 Santiago Chile
| | - Patricia Pérez
- Universidad Andres Bello; Facultad de Ciencias Exactas; Departamento de Ciencias Químicas, Millennium Nucleus Chemical Processes and Catalysis (CPC); Av. República 498 8370146 Santiago Chile
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170
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Mineo H, Yamaki M, Kim GS, Teranishi Y, Lin SH, Fujimura Y. Induction of unidirectional π-electron rotations in low-symmetry aromatic ring molecules using two linearly polarized stationary lasers. Phys Chem Chem Phys 2016; 18:26786-26795. [PMID: 27711497 DOI: 10.1039/c6cp04254f] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new laser-control scenario of unidirectional π-electron rotations in a low-symmetry aromatic ring molecule having no degenerate excited states is proposed. This scenario is based on dynamic Stark shifts of two relevant excited states using two linearly polarized stationary lasers. Each laser is set to selectively interact with one of the two electronic states, the lower and higher excited states are shifted up and down with the same rate, respectively, and the two excited states become degenerate at their midpoint. One of the four control parameters of the two lasers, i.e. two frequencies and two intensities, determines the values of all the other parameters. The direction of π-electron rotations, clockwise or counter-clockwise rotation, depends on the sign of the relative phase of the two lasers at the initial time. An analytical expression for the time-dependent expectation value of the rotational angular momentum operator is derived using the rotating wave approximation (RWA). The control scenario depends on the initial condition of the electronic states. The control scenario with the ground state as the initial condition was applied to toluene molecules. The derived time-dependent angular momentum consists of a train of unidirectional angular momentum pulses. The validity of the RWA was checked by numerically solving the time-dependent Schrödinger equation. The simulation results suggest an experimental realization of the induction of unidirectional π-electron rotations in low-symmetry aromatic ring molecules without using any intricate quantum-optimal control procedure. This may open up an effective generation method of ring currents and current-induced magnetic fields in biomolecules such as amino acids having aromatic ring molecules for searching their interactions.
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Affiliation(s)
- Hirobumi Mineo
- Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan 106
| | - Masahiro Yamaki
- Department of Applied Chemistry, Institute of Molecular Science and Center for Interdisciplinary Molecular Science, National Chiao-Tung University, Hsinchu 30010, Taiwan.
| | - Gap-Sue Kim
- Dharma College, Dongguk University, 30, Pildong-ro 1-gil, Jung-gu, Seoul, 04620, Korea
| | - Yoshiaki Teranishi
- Institute of Physics, National Chiao-Tung University, and Physics Division, National Center for Theoretical Sciences, Hsinchu 30010, Taiwan and Physics Division, National Center for Theoretical Sciences, Hsinchu, Taiwan 300
| | - Sheng Hsien Lin
- Department of Applied Chemistry, Institute of Molecular Science and Center for Interdisciplinary Molecular Science, National Chiao-Tung University, Hsinchu 30010, Taiwan.
| | - Yuichi Fujimura
- Department of Applied Chemistry, Institute of Molecular Science and Center for Interdisciplinary Molecular Science, National Chiao-Tung University, Hsinchu 30010, Taiwan. and Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
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171
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Seitz AE, Eckhardt M, Erlebach A, Peresypkina EV, Sierka M, Scheer M. Pnictogen-Silicon Analogues of Benzene. J Am Chem Soc 2016; 138:10433-6. [PMID: 27513314 DOI: 10.1021/jacs.6b07389] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Since the discovery of the first "inorganic benzene" (borazine, B3N3H6), the synthesis of other noncarbon derivatives is an ongoing challenge in Inorganic Chemistry. Here we report on the synthesis of the first pnictogen-silicon congeners of benzene, the triarsa- and the triphospha-trisilabenzene [(PhC(NtBu)2)3Si3E3] (E = P (1a), As (1b)) by a simple metathesis reaction. These compounds are formed by the reaction of [Cp″2Zr(η(1:1)-E4)] (E = P, As; Cp″ = C5H3tBu2) with [PhC(NtBu)2SiCl] in toluene at room temperature along with the silicon pnictogen congeners of the cyclobutadiene, [(PhC(NtBu)2)2Si2E2] (E = P (2a), As (2b)), which is unprecedented for the arsenic system 2b. All compounds were comprehensively characterized, and density functional theory calculations were performed to verify the stability and the aromatic character of the triarsa- and the triphospha-trisilabenzene.
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Affiliation(s)
- Andreas E Seitz
- Institute of Inorganic Chemistry, University of Regensburg , Universitätsstr. 31, 93040 Regensburg, Germany
| | - Maria Eckhardt
- Institute of Inorganic Chemistry, University of Regensburg , Universitätsstr. 31, 93040 Regensburg, Germany
| | - Andreas Erlebach
- Otto-Schott-Institut für Materialforschung, Friedrich-Schiller-Universität Jena , Löbdergraben 32, 07743 Jena, Germany
| | - Eugenia V Peresypkina
- Institute of Inorganic Chemistry, University of Regensburg , Universitätsstr. 31, 93040 Regensburg, Germany.,Nikolaev Institute of Inorganic Chemistry SB RAS , Ak. Lavrentiev prosp. 3, 630090 Novosibirsk, Russia
| | - Marek Sierka
- Otto-Schott-Institut für Materialforschung, Friedrich-Schiller-Universität Jena , Löbdergraben 32, 07743 Jena, Germany
| | - Manfred Scheer
- Institute of Inorganic Chemistry, University of Regensburg , Universitätsstr. 31, 93040 Regensburg, Germany
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172
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Wei W, Bai FQ, Xia BH, Wang J, Zhang HX. A density functional theory investigation of the stability, aromaticity, and photophysical behavior for the highly conjugated macrocycles containing 4 pyrroles. J PHYS ORG CHEM 2016. [DOI: 10.1002/poc.3617] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Wei Wei
- International Joint Research Laboratory of Nano-Micro Architecture Chemistry, Institute of Theoretical Chemistry; Jilin University; Changchun China
| | - Fu-Quan Bai
- International Joint Research Laboratory of Nano-Micro Architecture Chemistry, Institute of Theoretical Chemistry; Jilin University; Changchun China
| | - Bao-Hui Xia
- International Joint Research Laboratory of Nano-Micro Architecture Chemistry, Institute of Theoretical Chemistry; Jilin University; Changchun China
- College of Chemistry; Jilin University; Changchun China
| | - Jian Wang
- International Joint Research Laboratory of Nano-Micro Architecture Chemistry, Institute of Theoretical Chemistry; Jilin University; Changchun China
| | - Hong-Xing Zhang
- International Joint Research Laboratory of Nano-Micro Architecture Chemistry, Institute of Theoretical Chemistry; Jilin University; Changchun China
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173
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van de Wouw HL, Lee JY, Siegler MA, Klausen RS. Innocent BN bond substitution in anthracene derivatives. Org Biomol Chem 2016; 14:3256-63. [PMID: 26928939 DOI: 10.1039/c5ob02309b] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Extended azaborine heterocycles are promising biomedical and electronic materials. Herein we report the synthesis of a novel family of azaborine anthracene derivatives and their structural, electrochemical and spectroscopic characterization. We observe that the properties of these materials are remarkably similar to the parent hydrocarbons, suggesting the innocence of the CC to BN bond substitution. Our results support the prospective stability to long-term usage of extended azaborines and the feasibility of using such materials in device applications.
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Affiliation(s)
- H L van de Wouw
- Department of Chemistry, Johns Hopkins University, Baltimore, MD 21218, USA.
| | - J Y Lee
- Department of Chemistry, Johns Hopkins University, Baltimore, MD 21218, USA.
| | - M A Siegler
- Department of Chemistry, Johns Hopkins University, Baltimore, MD 21218, USA.
| | - R S Klausen
- Department of Chemistry, Johns Hopkins University, Baltimore, MD 21218, USA.
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174
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Sun G, Lei E, Liu XS, Yu CH, Duan XX, Liu CG. Theoretical investigation of structure diversity and electronic properties in the series isomeric [26]hexaphyrin (1.1.1.1.1.1) and [28]hexaphyrin (1.1.1.1.1.1). COMPUT THEOR CHEM 2016. [DOI: 10.1016/j.comptc.2016.04.020] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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175
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Affiliation(s)
- Riccardo Zanasi
- Dipartimento di Chimica e Biologia “Adolfo Zambelli”; Università di Salerno; Via Giovanni Paolo II, 132, Fisciano Salerno 84084 Italy
| | - Paolo Della Porta
- Dipartimento di Chimica e Biologia “Adolfo Zambelli”; Università di Salerno; Via Giovanni Paolo II, 132, Fisciano Salerno 84084 Italy
| | - Guglielmo Monaco
- Dipartimento di Chimica e Biologia “Adolfo Zambelli”; Università di Salerno; Via Giovanni Paolo II, 132, Fisciano Salerno 84084 Italy
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176
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Topology of Quantum Mechanical Current Density Vector Fields Induced in a Molecule by Static Magnetic Perturbations. ACTA ACUST UNITED AC 2016. [DOI: 10.1007/978-3-319-29022-5_7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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177
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Stabilization of non-standard conformations of the annulene rings in cyclobutadiene-framed [n]annulenes (n = 8, 10, 12, 14) and their beryllium sandwich-like complexes: a quantum chemical study. Struct Chem 2016. [DOI: 10.1007/s11224-016-0748-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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178
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179
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Özer MS, Menges N, Keskin S, Şahin E, Balci M. Synthesis of Pyrrole-Fused C,N-Cyclic Azomethine Imines and Pyrazolopyrrolopyrazines: Analysis of Their Aromaticity Using Nucleus-Independent Chemical Shifts Values. Org Lett 2016; 18:408-11. [DOI: 10.1021/acs.orglett.5b03434] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Merve Sinem Özer
- Department
of Chemistry, Middle East Technical University, 06800 Ankara, Turkey
| | - Nurettin Menges
- Department
of Chemistry, Middle East Technical University, 06800 Ankara, Turkey
- Faculty
of Pharmacy, Yüzüncü Yil University, 65100 Van, Turkey
| | - Selbi Keskin
- Department
of Chemistry, Middle East Technical University, 06800 Ankara, Turkey
- Department
of Chemistry, Giresun University, 28100 Giresun, Turkey
| | - Ertan Şahin
- Department
of Chemistry, Atatürk University, 25240 Erzurum, Turkey
| | - Metin Balci
- Department
of Chemistry, Middle East Technical University, 06800 Ankara, Turkey
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180
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Baryshnikov GV, Valiev RR, Karaush NN, Sundholm D, Minaev BF. Aromaticity of the doubly charged [8]circulenes. Phys Chem Chem Phys 2016; 18:8980-92. [DOI: 10.1039/c6cp00365f] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Magnetically induced current densities and current pathways have been calculated for a series of fully annelated dicationic and dianionic tetraphenylenes, which are also named [8]circulenes.
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Affiliation(s)
- Gleb V. Baryshnikov
- Division of Theoretical Chemistry and Biology
- School of Biotechnology
- KTH Royal Institute of Technology
- 10691 Stockholm
- Sweden
| | - Rashid R. Valiev
- Tomsk Polytechnic University
- Tomsk
- Russia
- Tomsk State University
- Tomsk
| | - Nataliya N. Karaush
- Department of Organic Chemistry
- Bohdan Khmelnitsky National University
- Cherkasy
- Ukraine
| | - Dage Sundholm
- Department of Chemistry
- University of Helsinki
- Helsinki Fin-00014
- Finland
| | - Boris F. Minaev
- Department of Organic Chemistry
- Bohdan Khmelnitsky National University
- Cherkasy
- Ukraine
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science
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181
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Gupta R, Bansal R. Aromaticity/antiaromaticity of phospha-analogues of carbocyclic ions: A DFT investigation. COMPUT THEOR CHEM 2016. [DOI: 10.1016/j.comptc.2015.11.020] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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182
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Nizovtsev AS. Search for aromatic anions in the P2E3− (E = N, P, As, Sb, Bi) series. Phys Chem Chem Phys 2016; 18:16084-7. [DOI: 10.1039/c6cp02241c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Nine aromatic five-membered rings were computationally characterized in the P2E3− (E = N, P, As, Sb, Bi) series of anions.
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Affiliation(s)
- Anton S. Nizovtsev
- Nikolaev Institute of Inorganic Chemistry
- Siberian Branch of the Russian Academy of Sciences
- Novosibirsk
- Russian Federation
- Novosibirsk State University
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183
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Abstract
A definition of ring currents in a velocity vector field is proposed according to topological criteria: ring currents are axial vortices confined in, or rotating beyond, a separatrix, i.e., the boundary which marks the limits of the vortex.
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Affiliation(s)
- Paolo Lazzeretti
- Dipartimento di Scienze Chimiche e Geologiche
- Università degli Studi di Modena e Reggio Emilia
- 41125 Modena
- Italy
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184
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Woller T, Ramos-Berdullas N, Mandado M, Alonso M, de Proft F, Contreras-García J. Understanding conductivity in molecular switches: a real space approach in octaphyrins. Phys Chem Chem Phys 2016; 18:11829-38. [DOI: 10.1039/c5cp07411h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
In recent years, expanded porphyrins have emerged as a promising class of π-conjugated switches whose conductance is studied from the electron density.
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Affiliation(s)
- T. Woller
- Eenheid Algemene Chemie (ALGC)
- Vrije Universiteit Brussel (VUB)
- 1050 Brussels
- Belgium
- Sorbonne Universités
| | | | - M. Mandado
- Department of Physical Chemistry
- University of Vigo
- 36310 Vigo
- Spain
| | - M. Alonso
- Eenheid Algemene Chemie (ALGC)
- Vrije Universiteit Brussel (VUB)
- 1050 Brussels
- Belgium
| | - F. de Proft
- Eenheid Algemene Chemie (ALGC)
- Vrije Universiteit Brussel (VUB)
- 1050 Brussels
- Belgium
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185
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Woller T, Contreras-García J, Geerlings P, De Proft F, Alonso M. Understanding the molecular switching properties of octaphyrins. Phys Chem Chem Phys 2016; 18:11885-900. [DOI: 10.1039/c5cp07413d] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Triggering Hückel–Möbius topological and aromaticity switches in octaphyrins by protonation and redox reactions.
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Affiliation(s)
- T. Woller
- Eenheid Algemene Chemie (ALGC)
- Vrije Universiteit Brussel (VUB)
- 1050 Brussels
- Belgium
| | - J. Contreras-García
- Sorbonne Universités
- UPMC Univ Paris 06
- UMR 7616
- Laboratoire de Chimie Théorique
- Paris
| | - P. Geerlings
- Eenheid Algemene Chemie (ALGC)
- Vrije Universiteit Brussel (VUB)
- 1050 Brussels
- Belgium
| | - Frank De Proft
- Eenheid Algemene Chemie (ALGC)
- Vrije Universiteit Brussel (VUB)
- 1050 Brussels
- Belgium
| | - M. Alonso
- Eenheid Algemene Chemie (ALGC)
- Vrije Universiteit Brussel (VUB)
- 1050 Brussels
- Belgium
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186
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Merino G, Solà M. Celebrating the 150th anniversary of the Kekulé benzene structure. Phys Chem Chem Phys 2016; 18:11587-8. [DOI: 10.1039/c6cp90088g] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This themed issue presents a collection of articles on ‘Electron delocalization and aromaticity: Celebrating the 150th Anniversary of the Kekulé Benzene Structure’.
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Affiliation(s)
- Gabriel Merino
- Departamento de Física Aplicada
- Centro de Investigación y de Estudios Avanzados
- Cordemex
- Mérida
- Mexico
| | - Miquel Solà
- Institut de Química Computacional i Catàlisi (IQCC) and Departament de Química
- Universitat de Girona
- 17071 Girona
- Spain
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187
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Liu C, Wang K, Gong X, Heeger AJ. Low bandgap semiconducting polymers for polymeric photovoltaics. Chem Soc Rev 2016; 45:4825-46. [DOI: 10.1039/c5cs00650c] [Citation(s) in RCA: 389] [Impact Index Per Article: 48.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
This review highlights the design rules for low bandgap semiconducting polymers, with the overview of their applications in polymer solar cells and polymer photodetectors.
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Affiliation(s)
- Chang Liu
- College of Polymer Science and Polymer Engineering
- Department of Polymer Engineering
- The University of Akron
- Akron
- USA
| | - Kai Wang
- College of Polymer Science and Polymer Engineering
- Department of Polymer Engineering
- The University of Akron
- Akron
- USA
| | - Xiong Gong
- College of Polymer Science and Polymer Engineering
- Department of Polymer Engineering
- The University of Akron
- Akron
- USA
| | - Alan J. Heeger
- Center for Polymers and Organic Solids
- University of California
- Santa Barbara
- USA
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188
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Trujillo C, Sánchez-Sanz G. A Study of π-π Stacking Interactions and Aromaticity in Polycyclic Aromatic Hydrocarbon/Nucleobase Complexes. Chemphyschem 2015; 17:395-405. [PMID: 26663678 DOI: 10.1002/cphc.201501019] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2015] [Revised: 12/05/2015] [Indexed: 11/10/2022]
Abstract
We analysed the interactions and aromaticity electron-density delocalisation observed in π-π complexes between the phenalenyl radical and acenaphthylene, and the DNA and RNA nucleobases (adenine, guanine, cytosine, thymine and uracil). Interaction energies are obtained at the M06-2X/6-311++G(2df,p) computational level for gas phase and PCM-water conditions. For both the phenalenyl radical and acenaphthylene, the complexes formed with guanine are the most stable ones. Atoms in molecules and natural bond orbital results reveal weak π-π interactions between both interacting moieties, characterized by bond critical points between C⋅⋅⋅C and C⋅⋅⋅N atoms. Nucleus independent chemical shifts (NICS) indicate the retention of the aromatic character of the monomers in the outer region of the complex. The fluctuation indexes reveal a loss of electron delocalisation upon complexation for all cases except guanine complexes. Nevertheless, the interface region shows large negative NICS values, which is not associated with an increase of the aromaticity or electron-density delocalisation, but with magnetic couplings of both molecules, leading to an unrealistic description of the aromatic behaviour in that region.
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Affiliation(s)
- Cristina Trujillo
- School of Chemistry, Trinity Biomedical Sciences, Trinity College Dublin, 152-160 Pearse Street, Dublin 2, Ireland
| | - Goar Sánchez-Sanz
- School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland.
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189
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Santos JC, Andres J, Aizman A, Fuentealba P. An Aromaticity Scale Based on the Topological Analysis of the Electron Localization Function Including σ and π Contributions. J Chem Theory Comput 2015; 1:83-6. [PMID: 26641119 DOI: 10.1021/ct0499276] [Citation(s) in RCA: 118] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In this work, the average bifurcation value of the electron localization function (ELF) of both σ (ELFσ) and π (ELFπ) contributions was used to construct an aromaticity scale for chemical compounds. We have validated the scale with a series of well-known molecules and then used it to evaluate global aromaticity on aluminum based clusters, which present σ aromaticity and π antiaromaticity. The proposed scaled predicts an overall antiaromatic character for the Al4(4)(-) moiety.
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Affiliation(s)
- Juan C Santos
- Departamento de Química, Universidad Técnica Federico Santa Maria, Casilla 110V, Valparaíso, Chile, Departament de Ciències Experimentals, Universitat Jaume I, Apartat 224, 12080, Castelló, Spain, and Departamento de Física, Universidad de Chile, Las Palmeras 3425, Santiago, Chile
| | - Juan Andres
- Departamento de Química, Universidad Técnica Federico Santa Maria, Casilla 110V, Valparaíso, Chile, Departament de Ciències Experimentals, Universitat Jaume I, Apartat 224, 12080, Castelló, Spain, and Departamento de Física, Universidad de Chile, Las Palmeras 3425, Santiago, Chile
| | - Arie Aizman
- Departamento de Química, Universidad Técnica Federico Santa Maria, Casilla 110V, Valparaíso, Chile, Departament de Ciències Experimentals, Universitat Jaume I, Apartat 224, 12080, Castelló, Spain, and Departamento de Física, Universidad de Chile, Las Palmeras 3425, Santiago, Chile
| | - Patricio Fuentealba
- Departamento de Química, Universidad Técnica Federico Santa Maria, Casilla 110V, Valparaíso, Chile, Departament de Ciències Experimentals, Universitat Jaume I, Apartat 224, 12080, Castelló, Spain, and Departamento de Física, Universidad de Chile, Las Palmeras 3425, Santiago, Chile
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190
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Sun G, Duan XX, Yu CH, Liu CG. Theoretical investigation of the aromaticity and electronic properties of protonated and unprotonated molecules in the series hexaphyrin(1.0.0.1.0.0) to hexaphyrin(1.1.1.1.1.1). J Mol Model 2015; 21:315. [DOI: 10.1007/s00894-015-2862-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2015] [Accepted: 11/10/2015] [Indexed: 10/22/2022]
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191
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Allison TC, Burgess DR. First-Principles Prediction of Enthalpies of Formation for Polycyclic Aromatic Hydrocarbons and Derivatives. J Phys Chem A 2015; 119:11329-65. [PMID: 26485436 PMCID: PMC5769711 DOI: 10.1021/acs.jpca.5b07908] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In this article, the first-principles prediction of enthalpies of formation is demonstrated for 669 polycyclic aromatic hydrocarbon (PAH) compounds and a number of related functionalized molecules. It is shown that by extrapolating density functional theory calculations to a large basis set limit and then applying a group based correction scheme that good results may be obtained. Specifically, a mean unsigned deviation and root mean squared deviation from the experimental enthalpies of formation data of 5.0 and 6.4 kJ/mol, respectively, are obtained using this scheme. This computational scheme is economical to compute and straightforward to apply, while yielding results of reasonable reliability. The results are also compared for a smaller set of molecules to the predictions given by the G3B3 and G3MP2B3 variants of the Gaussian-3 model chemistry with a mean unsigned deviation and root mean squared deviation from the experimental enthalpies of formation of 4.5 and 4.8 kJ/mol, respectively.
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Affiliation(s)
- Thomas C. Allison
- Chemical Science Division, Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Stop 8320, Gaithersburg, Maryland 20899-8320, United States
| | - Donald R. Burgess
- Chemical Science Division, Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Stop 8320, Gaithersburg, Maryland 20899-8320, United States
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192
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Sun H, An K, Zhu J. Triplet State Aromaticity: NICS Criterion, Hyperconjugation, and Charge Effects. Chem Asian J 2015; 11:234-40. [PMID: 26507692 DOI: 10.1002/asia.201500897] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2015] [Revised: 09/28/2015] [Indexed: 11/06/2022]
Abstract
Aromaticity, one of the most important concepts in organic chemistry, has attracted considerable interest from both experimentalists and theoreticians. It remains unclear which NICS index is best to evaluate the triplet-state aromaticity. Here, we carry out thorough density functional theory (DFT) calculations to examine this issue. Our results indicate that among the various computationally available NICS indices, NICS(1)zz is the best for the triplet state. The correlations can be improved from 0.840 to 0.938 when only neutral species are considered, demonstrating the significant effect of the charge on the triplet-state aromaticity. In addition, calculations suggest that five-membered cyclic species with "hyperconjugative" aromaticity (and antiaromaticity) in the S0 state will become antiaromatic (and aromatic) in the T1 state, indicating an important role of hyperconjugation. Finally, a moderate correlation (r(2) =0.708) is identified between the NICS(1)zz values and spin distributions.
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Affiliation(s)
- Hongchao Sun
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry and, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, Fujian, P. R. China
| | - Ke An
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry and, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, Fujian, P. R. China
| | - Jun Zhu
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry and, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, Fujian, P. R. China.
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193
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Chen B, Hoffmann R, Ashcroft NW, Badding J, Xu E, Crespi V. Linearly Polymerized Benzene Arrays As Intermediates, Tracing Pathways to Carbon Nanothreads. J Am Chem Soc 2015; 137:14373-86. [PMID: 26488180 DOI: 10.1021/jacs.5b09053] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
How might fully saturated benzene polymers of composition [(CH)6]n form under high pressure? In the first approach to answering this question, we examine the stepwise increase in saturation of a one-dimensional stack of benzene molecules by enumerating the partially saturated polymer intermediates, subject to constraints of unit cell size and energy. Defining the number of four-coordinate carbon atoms per benzene formula unit as the degree of saturation, a set of isomers for degree-two and degree-four polymers can be generated by either thinking of the propagation of partially saturated building blocks or by considering a sequence of cycloadditions. There is also one 4 + 2 reaction sequence that jumps directly from a benzene stack to a degree-four polymer. The set of degree-two polymers provides several useful signposts toward achieving full saturation: chiral versus achiral building blocks, certain forms of conformational freedom, and also dead ends to further saturation. These insights allow us to generate a larger set of degree-four polymers and enumerate the many pathways that lead from benzene stacks to completely saturated carbon nanothreads.
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Affiliation(s)
- Bo Chen
- Department of Chemistry and Chemical Biology, Cornell University, Baker Laboratory , Ithaca, New York 14853-1301, United States
| | - Roald Hoffmann
- Department of Chemistry and Chemical Biology, Cornell University, Baker Laboratory , Ithaca, New York 14853-1301, United States
| | - N W Ashcroft
- Laboratory of Atomic and Solid State Physics, Cornell University , Ithaca, New York 14850, United States
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194
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The properties of hydrogenated derivatives of the alkali atom coated clusters C6M6 (M=Li, Na): A density functional study. COMPUT THEOR CHEM 2015. [DOI: 10.1016/j.comptc.2015.06.023] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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195
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Oziminski WP, Ramsden CA. A DFT and ab initio study of conjugated and semi-conjugated mesoionic rings and their covalent isomers. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.01.045] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Wang J, Baerends EJ. Real-space representation of electron correlation in π-conjugated systems. J Chem Phys 2015; 142:204311. [DOI: 10.1063/1.4921725] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Jian Wang
- School of Science, Huzhou University, Zhejiang 10083, China
| | - Evert Jan Baerends
- Afdeling Theoretische Chemie, FEW, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
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Velian A, Cummins CC. Synthesis and characterization of P2N3-: An aromatic ion composed of phosphorus and nitrogen. Science 2015; 348:1001-4. [DOI: 10.1126/science.aab0204] [Citation(s) in RCA: 79] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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