1
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Brieger L, Schrimpf T, Scheel R, Unkelbach C, Strohmann C. Towards Substrate-Reagent Interaction of Lochmann-Schlosser Bases in THF: Bridging THF Hides Potential Reaction Site of a Chiral Superbase. Chemistry 2022; 28:e202202660. [PMID: 36098179 PMCID: PMC10092790 DOI: 10.1002/chem.202202660] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Indexed: 12/14/2022]
Abstract
The metalation of N,N-dimethylaminomethylferrocene in THF by the superbasic mixture of n BuLi/KOt Bu proceeds readily at low temperatures to afford a bimetallic Li2 K2 aggregate containing ferrocenyl anions and tert-butoxide. Starting from an enantiomerically enriched ortho-lithiated aminomethylferrocene, an enantiomerically pure superbase can be prepared. The molecular compound exhibits superbasic behavior deprotonating N,N-dimethylbenzylamine in the α-position and is also capable of deprotonating toluene. Quantum chemical calculations provide insight into the role of the bridging THF molecule to the possible substrate-reagent interaction. In addition, a benzylpotassium alkoxide adduct gives a closer look into the corresponding reaction site of the Lochmann-Schlosser base that is reported herein.
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Affiliation(s)
- Lukas Brieger
- Inorganic Chemistry, TU Dortmund University, Otto-Hahn-Str. 6/6a, 44227, Dortmund, Germany
| | - Tobias Schrimpf
- Inorganic Chemistry, TU Dortmund University, Otto-Hahn-Str. 6/6a, 44227, Dortmund, Germany
| | - Rebecca Scheel
- Inorganic Chemistry, TU Dortmund University, Otto-Hahn-Str. 6/6a, 44227, Dortmund, Germany
| | - Christian Unkelbach
- Inorganic Chemistry, TU Dortmund University, Otto-Hahn-Str. 6/6a, 44227, Dortmund, Germany
| | - Carsten Strohmann
- Inorganic Chemistry, TU Dortmund University, Otto-Hahn-Str. 6/6a, 44227, Dortmund, Germany
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2
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Krzeszewski M, Dobrzycki Ł, Sobolewski AL, Cyrański MK, Gryko DT. Bowl-Shaped Pentagon- and Heptagon-Embedded Nanographene Containing a Central Pyrrolo[3,2-b]pyrrole Core. Angew Chem Int Ed Engl 2021; 60:14998-15005. [PMID: 33831270 DOI: 10.1002/anie.202104092] [Citation(s) in RCA: 41] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Indexed: 11/11/2022]
Abstract
A bowl-shaped nitrogen-doped nanographene composed of a pyrrolo[3,2-b]pyrrole core substituted with six arene rings circularly bonded with one another has been prepared via a concise synthetic strategy encompassing the multicomponent tetraarylpyrrolopyrrole (TAPP) synthesis, the Scholl reaction, and intramolecular direct arylation. This synthesis represents the first case of programmed sequential intramolecular direct arylation reactions utilizing the different reactivity of C-Br and C-Cl bonds. The target compound contains two central pentagons confined between two adjacent heptagons-the inverse Stone-Thrower-Wales topology. The presence of both five- and seven-membered rings in the final structure is responsible for interesting properties such as a perpendicularly aligned dipole moment, absorption and fluorescence in the orange-red region, weak emission originating from the charge-transfer character of a low-energy absorption band, and a high lying HOMO. In the solid state slipped convex-to-convex π-π stacking dominates.
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Affiliation(s)
- Maciej Krzeszewski
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44-52, 01-224, Warsaw, Poland
| | - Łukasz Dobrzycki
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093, Warsaw, Poland
| | - Andrzej L Sobolewski
- Institute of Physics Polish Academy of Sciences, Al. Lotników 32/46, 02-668, Warsaw, Poland
| | - Michał K Cyrański
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093, Warsaw, Poland
| | - Daniel T Gryko
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44-52, 01-224, Warsaw, Poland
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3
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Krzeszewski M, Dobrzycki Ł, Sobolewski AL, Cyrański MK, Gryko DT. Bowl‐Shaped Pentagon‐ and Heptagon‐Embedded Nanographene Containing a Central Pyrrolo[3,2‐
b
]pyrrole Core. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202104092] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Maciej Krzeszewski
- Institute of Organic Chemistry Polish Academy of Sciences Kasprzaka 44–52 01-224 Warsaw Poland
| | - Łukasz Dobrzycki
- Faculty of Chemistry University of Warsaw Pasteura 1 02-093 Warsaw Poland
| | - Andrzej L. Sobolewski
- Institute of Physics Polish Academy of Sciences Al. Lotników 32/46 02-668 Warsaw Poland
| | - Michał K. Cyrański
- Faculty of Chemistry University of Warsaw Pasteura 1 02-093 Warsaw Poland
| | - Daniel T. Gryko
- Institute of Organic Chemistry Polish Academy of Sciences Kasprzaka 44–52 01-224 Warsaw Poland
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4
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Zhou Z, Zhu Y, Wei Z, Bergner J, Neiß C, Doloczki S, Görling A, Kivala M, Petrukhina MA. Reduction of π-Expanded Cyclooctatetraene with Lithium: Stabilization of the Tetra-Anion through Internal Li + Coordination. Angew Chem Int Ed Engl 2021; 60:3510-3514. [PMID: 33108043 PMCID: PMC7898929 DOI: 10.1002/anie.202013353] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2020] [Indexed: 01/18/2023]
Abstract
The chemical reduction of a π-expanded polycyclic framework comprising a cyclooctatetraene moiety, octaphenyltetrabenzocyclooctatetraene, with lithium metal readily affords the corresponding tetra-anion instead of the expected aromatic dianion. As revealed by X-ray crystallography, the highly contorted tetra-anion is stabilized by coordination of two internally bound Li+ , while two external cations remain solvent separated. The variable-temperature 7 Li NMR spectra in THF confirm the presence of three types of Li+ ions and clearly differentiate internal binding, consistent with the crystal structure. Density-functional theory calculations suggest that the formation of the highly charged tetra-reduced carbanion is stabilized through Li+ coordination under the applied experimental conditions.
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Affiliation(s)
- Zheng Zhou
- Department of ChemistryUniversity at AlbanyState University of New York1400 Washington Ave.AlbanyNY12222USA
| | - Yikun Zhu
- Department of ChemistryUniversity at AlbanyState University of New York1400 Washington Ave.AlbanyNY12222USA
| | - Zheng Wei
- Department of ChemistryUniversity at AlbanyState University of New York1400 Washington Ave.AlbanyNY12222USA
| | - John Bergner
- Organisch-Chemisches InstitutRuprecht-Karls-Universität HeidelbergIm Neuenheimer Feld 27069120HeidelbergGermany
- Centre for Advanced MaterialsRuprecht-Karls-Universität HeidelbergIm Neuenheimer Feld 22569120HeidelbergGermany
| | - Christian Neiß
- Department of Chemistry and PharmacyChair of Theoretical ChemistryFriedrich-Alexander-Universität Erlangen-NürnbergEgerlandstr. 391058ErlangenGermany
| | - Susanne Doloczki
- Department of Chemistry and PharmacyChair of Organic Chemistry IFriedrich-Alexander-Universität Erlangen-NürnbergNikolaus-Fiebiger-Str. 1091058ErlangenGermany
| | - Andreas Görling
- Department of Chemistry and PharmacyChair of Theoretical ChemistryFriedrich-Alexander-Universität Erlangen-NürnbergEgerlandstr. 391058ErlangenGermany
| | - Milan Kivala
- Organisch-Chemisches InstitutRuprecht-Karls-Universität HeidelbergIm Neuenheimer Feld 27069120HeidelbergGermany
- Centre for Advanced MaterialsRuprecht-Karls-Universität HeidelbergIm Neuenheimer Feld 22569120HeidelbergGermany
| | - Marina A. Petrukhina
- Department of ChemistryUniversity at AlbanyState University of New York1400 Washington Ave.AlbanyNY12222USA
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5
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Zhou Z, Zhu Y, Wei Z, Bergner J, Neiß C, Doloczki S, Görling A, Kivala M, Petrukhina MA. Reduction of π‐Expanded Cyclooctatetraene with Lithium: Stabilization of the Tetra‐Anion through Internal Li
+
Coordination. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202013353] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Zheng Zhou
- Department of Chemistry University at Albany State University of New York 1400 Washington Ave. Albany NY 12222 USA
| | - Yikun Zhu
- Department of Chemistry University at Albany State University of New York 1400 Washington Ave. Albany NY 12222 USA
| | - Zheng Wei
- Department of Chemistry University at Albany State University of New York 1400 Washington Ave. Albany NY 12222 USA
| | - John Bergner
- Organisch-Chemisches Institut Ruprecht-Karls-Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
- Centre for Advanced Materials Ruprecht-Karls-Universität Heidelberg Im Neuenheimer Feld 225 69120 Heidelberg Germany
| | - Christian Neiß
- Department of Chemistry and Pharmacy Chair of Theoretical Chemistry Friedrich-Alexander-Universität Erlangen-Nürnberg Egerlandstr. 3 91058 Erlangen Germany
| | - Susanne Doloczki
- Department of Chemistry and Pharmacy Chair of Organic Chemistry I Friedrich-Alexander-Universität Erlangen-Nürnberg Nikolaus-Fiebiger-Str. 10 91058 Erlangen Germany
| | - Andreas Görling
- Department of Chemistry and Pharmacy Chair of Theoretical Chemistry Friedrich-Alexander-Universität Erlangen-Nürnberg Egerlandstr. 3 91058 Erlangen Germany
| | - Milan Kivala
- Organisch-Chemisches Institut Ruprecht-Karls-Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
- Centre for Advanced Materials Ruprecht-Karls-Universität Heidelberg Im Neuenheimer Feld 225 69120 Heidelberg Germany
| | - Marina A. Petrukhina
- Department of Chemistry University at Albany State University of New York 1400 Washington Ave. Albany NY 12222 USA
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6
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Rogachev AY, Alkan M, Li J, Liu S, Spisak SN, Filatov AS, Petrukhina MA. Mono-reduced Corannulene: To Couple and Not to Couple in One Crystal. Chemistry 2019; 25:14140-14147. [PMID: 31390107 DOI: 10.1002/chem.201902992] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2019] [Indexed: 11/07/2022]
Abstract
One-electron reduction of corannulene, C20 H10 , with Li metal in diglyme resulted in crystallization of [{Li+ (diglyme)2 }4 (C20 H10 .- )2 (C20 H10 -C20 H10 )2- ] (1), as revealed by single-crystal X-ray diffraction. This hybrid product contains two corannulene monoanion-radicals along with a dianionic dimer, crystallized with four Li+ ions wrapped by diglyme molecules. The dimeric (C20 H10 -C20 H10 )2- anion provides the first crystallographically confirmed example of spontaneous radical dimerization for C20 H10 .- . The C-C bond length between the two C20 H10 .- bowls of 1.588(5) Å is consistent with the single σ-bond character of the linker. The trans-disposition of two bowls in the centrosymmetric (C20 H10 -C20 H10 )2- dimer is observed with the torsion angle around the central C-C bond of 180°. Comprehensive theoretical analysis of formation/decomposition processes of the dimeric dianion has been carried out in order to evaluate the nature of bonding and energetics of the C20 H10 .- coupling. It is found that such σ-bonded dimers are thermodynamically unstable due to large preparation energy and repulsive Pauli component of the bonding, but kinetically persistent due to a high energy barrier provided by the existing spin-crossing point.
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Affiliation(s)
- Andrey Yu Rogachev
- Department of Chemistry, Illinois Institute of Technology, Chicago, IL 60616, USA
| | - Melisa Alkan
- Department of Chemistry, Illinois Institute of Technology, Chicago, IL 60616, USA
| | - Jingbai Li
- Department of Chemistry, Illinois Institute of Technology, Chicago, IL 60616, USA
| | - Shuyang Liu
- Department of Chemistry, Illinois Institute of Technology, Chicago, IL 60616, USA
| | - Sarah N Spisak
- Department of Chemistry, University at Albany, State University of New York, Albany, NY, 12222, USA
| | - Alexander S Filatov
- Department of Chemistry, University at Albany, State University of New York, Albany, NY, 12222, USA
| | - Marina A Petrukhina
- Department of Chemistry, University at Albany, State University of New York, Albany, NY, 12222, USA
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7
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Zhou Z, Wang X, Wei Z, Müllen K, Petrukhina MA. Charging OBO-Fused Double [5]Helicene with Electrons. Angew Chem Int Ed Engl 2019; 58:14969-14973. [PMID: 31430019 PMCID: PMC6916263 DOI: 10.1002/anie.201908658] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Indexed: 12/20/2022]
Abstract
Chemical reduction of OBO-fused double[5]helicene with Group 1 metals (Na and K) has been investigated for the first time. Two doubly-reduced products have been isolated and structurally characterized by single-crystal X-ray diffraction, revealing a solvent-separated ion triplet (SSIT) with Na+ ions and a contact-ion pair (CIP) with K+ ion. As the key structural outcome, the X-ray crystallographic analysis discloses the consequences of adding two electrons to the double helicene core in the SSIT without metal binding and reveals the preferential binding site in the CIP with K+ counterions. In both products, an increase in the twisting of the double helicene core upon charging was observed. The negative charge localization at the central core has been identified by theoretical calculations, which are in full agreement with X-ray crystallographic and NMR spectroscopic results. Notably, it was confirmed that the two-electron reduction of OBO-fused double[5]helicene is reversible.
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Affiliation(s)
- Zheng Zhou
- Department of ChemistryUniversity at Albany, State University of New York1400 Washington Ave.AlbanyNY12222USA
| | - Xiao‐Ye Wang
- Max Planck Institute for Polymer ResearchAckermannweg 1055128MainzGermany
| | - Zheng Wei
- Department of ChemistryUniversity at Albany, State University of New York1400 Washington Ave.AlbanyNY12222USA
| | - Klaus Müllen
- Max Planck Institute for Polymer ResearchAckermannweg 1055128MainzGermany
| | - Marina A. Petrukhina
- Department of ChemistryUniversity at Albany, State University of New York1400 Washington Ave.AlbanyNY12222USA
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8
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Zhou Z, Wang X, Wei Z, Müllen K, Petrukhina MA. Charging OBO‐Fused Double [5]Helicene with Electrons. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201908658] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Zheng Zhou
- Department of Chemistry University at Albany, State University of New York 1400 Washington Ave. Albany NY 12222 USA
| | - Xiao‐Ye Wang
- Max Planck Institute for Polymer Research Ackermannweg 10 55128 Mainz Germany
| | - Zheng Wei
- Department of Chemistry University at Albany, State University of New York 1400 Washington Ave. Albany NY 12222 USA
| | - Klaus Müllen
- Max Planck Institute for Polymer Research Ackermannweg 10 55128 Mainz Germany
| | - Marina A. Petrukhina
- Department of Chemistry University at Albany, State University of New York 1400 Washington Ave. Albany NY 12222 USA
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9
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Zhou Z, Wei Z, Tokimaru Y, Ito S, Nozaki K, Petrukhina MA. Stepwise Reduction of Azapentabenzocorannulene. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201906748] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Zheng Zhou
- Department of Chemistry University at Albany State University of New York Albany NY 12222 USA
| | - Zheng Wei
- Department of Chemistry University at Albany State University of New York Albany NY 12222 USA
| | - Yuki Tokimaru
- Department of Chemistry and Biotechnology Graduate School of Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan
| | - Shingo Ito
- Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore
| | - Kyoko Nozaki
- Department of Chemistry and Biotechnology Graduate School of Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan
| | - Marina A. Petrukhina
- Department of Chemistry University at Albany State University of New York Albany NY 12222 USA
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10
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Zhou Z, Wei Z, Tokimaru Y, Ito S, Nozaki K, Petrukhina MA. Stepwise Reduction of Azapentabenzocorannulene. Angew Chem Int Ed Engl 2019; 58:12107-12111. [DOI: 10.1002/anie.201906748] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Indexed: 01/17/2023]
Affiliation(s)
- Zheng Zhou
- Department of Chemistry University at Albany State University of New York Albany NY 12222 USA
| | - Zheng Wei
- Department of Chemistry University at Albany State University of New York Albany NY 12222 USA
| | - Yuki Tokimaru
- Department of Chemistry and Biotechnology Graduate School of Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan
| | - Shingo Ito
- Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore
| | - Kyoko Nozaki
- Department of Chemistry and Biotechnology Graduate School of Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan
| | - Marina A. Petrukhina
- Department of Chemistry University at Albany State University of New York Albany NY 12222 USA
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11
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Fujimori S, Mizuhata Y, Tokitoh N. A Mixed‐Anion System Consisting of a Germyl Anion and Anions Delocalized on Conjugated Carbon Ring Skeletons. Chemistry 2019; 25:6284-6289. [DOI: 10.1002/chem.201900699] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Indexed: 12/31/2022]
Affiliation(s)
- Shiori Fujimori
- Institute for Chemical ResearchKyoto University Gokasho Uji Kyoto 611-0011 Japan
| | - Yoshiyuki Mizuhata
- Institute for Chemical ResearchKyoto University Gokasho Uji Kyoto 611-0011 Japan
- Integrated Research Consortium on Chemical Sciences Gokasho Uji Kyoto 611-0011 Japan
| | - Norihiro Tokitoh
- Institute for Chemical ResearchKyoto University Gokasho Uji Kyoto 611-0011 Japan
- Integrated Research Consortium on Chemical Sciences Gokasho Uji Kyoto 611-0011 Japan
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12
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Höfler D, Goddard R, Lingnau JB, Nöthling N, List B. A Purely Organic Tricarbanion. Angew Chem Int Ed Engl 2018; 57:8326-8329. [DOI: 10.1002/anie.201803647] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Revised: 04/23/2018] [Indexed: 11/10/2022]
Affiliation(s)
- Denis Höfler
- Max-Planck Institut für Kohlenforschung Kaiser-Wilhelm-Platz 1 45470 Mülheim an der Ruhr Germany
| | - Richard Goddard
- Max-Planck Institut für Kohlenforschung Kaiser-Wilhelm-Platz 1 45470 Mülheim an der Ruhr Germany
| | - Julia B. Lingnau
- Max-Planck Institut für Kohlenforschung Kaiser-Wilhelm-Platz 1 45470 Mülheim an der Ruhr Germany
| | - Nils Nöthling
- Max-Planck Institut für Kohlenforschung Kaiser-Wilhelm-Platz 1 45470 Mülheim an der Ruhr Germany
| | - Benjamin List
- Max-Planck Institut für Kohlenforschung Kaiser-Wilhelm-Platz 1 45470 Mülheim an der Ruhr Germany
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13
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Höfler D, Goddard R, Lingnau JB, Nöthling N, List B. Ein rein organisches Tricarbanion. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201803647] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Denis Höfler
- Max-Planck Institut für Kohlenforschung Kaiser-Wilhelm-Platz 1 45470 Mülheim an der Ruhr Deutschland
| | - Richard Goddard
- Max-Planck Institut für Kohlenforschung Kaiser-Wilhelm-Platz 1 45470 Mülheim an der Ruhr Deutschland
| | - Julia B. Lingnau
- Max-Planck Institut für Kohlenforschung Kaiser-Wilhelm-Platz 1 45470 Mülheim an der Ruhr Deutschland
| | - Nils Nöthling
- Max-Planck Institut für Kohlenforschung Kaiser-Wilhelm-Platz 1 45470 Mülheim an der Ruhr Deutschland
| | - Benjamin List
- Max-Planck Institut für Kohlenforschung Kaiser-Wilhelm-Platz 1 45470 Mülheim an der Ruhr Deutschland
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14
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Zhou Z, Spisak SN, Xu Q, Rogachev AY, Wei Z, Marcaccio M, Petrukhina MA. Fusing a Planar Group to a π-Bowl: Electronic and Molecular Structure, Aromaticity and Solid-State Packing of Naphthocorannulene and its Anions. Chemistry 2018; 24:3455-3463. [PMID: 29328530 DOI: 10.1002/chem.201705814] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2017] [Indexed: 01/08/2023]
Abstract
Molecular and electronic structure, reduction electron transfer and coordination abilities of a polycyclic aromatic hydrocarbon (PAH) having a planar naphtho-group fused to the corannulene bowl have been investigated for the first time using a combination of theoretical and experimental tools. A direct comparison of naphtho[2,3-a]corannulene (C28 H14 , 1) with parent corannulene (C20 H10 , 2) revealed the effect of framework topology change on electronic properties and aromaticity of 1. The presence of two reduction steps for 1 was predicted theoretically and confirmed experimentally. Two reversible one-electron reduction processes with the formal reduction potentials at -2.30 and -2.77 V versus Fc+/0 were detected by cyclic voltammetry (CV) measurements, demonstrating accessibility of the corresponding mono- and dianionic states of 1. The products of the singly and doubly reduced napththocorannulene were prepared using chemical reduction with Group 1 metals and isolated as sodium and rubidium salts. Their X-ray diffraction study revealed the formation of "naked" mono- and dianions crystallized as solvent-separated ion products with one or two sodium cations as [Na+ (18-crown-6)(THF)2 ][C28 H14- ] and [Na+ (18-crown-6)(THF)2 ]2 [C28 H142- ] (3⋅THF and 4⋅THF, respectively). The dianion of 1 was also isolated as a contact-ion complex with two rubidium countercations, [{Rb+ (18-crown-6)}2 (C28 H142- )] (5⋅THF). The structural consequences of adding one and two electrons to the carbon framework of 1 are compared for 3, 4 and 5. Changes in aromaticity and charge distribution stemming from the stepwise electron acquisition are discussed based on DFT computational study.
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Affiliation(s)
- Zheng Zhou
- Department of Chemistry, University at Albany, State University of New York, Albany, NY, 12222, USA
| | - Sarah N Spisak
- Department of Chemistry, University at Albany, State University of New York, Albany, NY, 12222, USA
| | - Qi Xu
- Department of Chemistry, Illinois Institute of Technology, Chicago, IL, 60616, USA
| | - Andrey Yu Rogachev
- Department of Chemistry, Illinois Institute of Technology, Chicago, IL, 60616, USA
| | - Zheng Wei
- Department of Chemistry, University at Albany, State University of New York, Albany, NY, 12222, USA
| | - Massimo Marcaccio
- Department of Chemistry "G. Ciamician", University of Bologna, Via Selmi 2, 40126, Bologna, Italy
| | - Marina A Petrukhina
- Department of Chemistry, University at Albany, State University of New York, Albany, NY, 12222, USA
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15
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Keshri SK, Kumar S, Mandal K, Mukhopadhyay P. Ambient Water-Stable Dianionic Electron Donors: Intramolecular Noncovalent Conduits Assist Charge Delocalization. Chemistry 2017; 23:11802-11809. [DOI: 10.1002/chem.201701868] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2017] [Indexed: 12/13/2022]
Affiliation(s)
- Sudhir Kumar Keshri
- Supramolecular and Material Chemistry Lab; School of Physical Sciences; Jawaharlal Nehru University; New Delhi 110067 India
| | - Sharvan Kumar
- Supramolecular and Material Chemistry Lab; School of Physical Sciences; Jawaharlal Nehru University; New Delhi 110067 India
| | - Kalyanashis Mandal
- Supramolecular and Material Chemistry Lab; School of Physical Sciences; Jawaharlal Nehru University; New Delhi 110067 India
| | - Pritam Mukhopadhyay
- Supramolecular and Material Chemistry Lab; School of Physical Sciences; Jawaharlal Nehru University; New Delhi 110067 India
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16
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Rice AM, Fellows WB, Dolgopolova EA, Greytak AB, Vannucci AK, Smith MD, Karakalos SG, Krause JA, Avdoshenko SM, Popov AA, Shustova NB. Hierarchical Corannulene-Based Materials: Energy Transfer and Solid-State Photophysics. Angew Chem Int Ed Engl 2017; 56:4525-4529. [PMID: 28332256 PMCID: PMC5396291 DOI: 10.1002/anie.201612199] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Revised: 02/08/2017] [Indexed: 11/06/2022]
Abstract
We report the first example of a donor-acceptor corannulene-containing hybrid material with rapid ligand-to-ligand energy transfer (ET). Additionally, we provide the first time-resolved photoluminescence (PL) data for any corannulene-based compounds in the solid state. Comprehensive analysis of PL data in combination with theoretical calculations of donor-acceptor exciton coupling was employed to estimate ET rate and efficiency in the prepared material. The ligand-to-ligand ET rate calculated using two models is comparable with that observed in fullerene-containing materials, which are generally considered for molecular electronics development. Thus, the presented studies not only demonstrate the possibility of merging the intrinsic properties of π-bowls, specifically corannulene derivatives, with the versatility of crystalline hybrid scaffolds, but could also foreshadow the engineering of a novel class of hierarchical corannulene-based hybrid materials for optoelectronic devices.
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Affiliation(s)
- Allison M Rice
- Department of Chemistry and Biochemistry, University of South Carolina, 631 Sumter Street, Columbia, SC, 29208, USA
| | - W Brett Fellows
- Department of Chemistry and Biochemistry, University of South Carolina, 631 Sumter Street, Columbia, SC, 29208, USA
| | - Ekaterina A Dolgopolova
- Department of Chemistry and Biochemistry, University of South Carolina, 631 Sumter Street, Columbia, SC, 29208, USA
| | - Andrew B Greytak
- Department of Chemistry and Biochemistry, University of South Carolina, 631 Sumter Street, Columbia, SC, 29208, USA
| | - Aaron K Vannucci
- Department of Chemistry and Biochemistry, University of South Carolina, 631 Sumter Street, Columbia, SC, 29208, USA
| | - Mark D Smith
- Department of Chemistry and Biochemistry, University of South Carolina, 631 Sumter Street, Columbia, SC, 29208, USA
| | - Stavros G Karakalos
- College of Engineering and Computing, Swearingen Engineering Center, Columbia, SC, 29208, USA
| | - Jeanette A Krause
- Department of Chemistry, University of Cincinnati, Cincinnati, OH, 45221, USA
| | | | - Alexey A Popov
- Leibniz Institute for Solid State and Materials Research, 01069, Dresden, Germany
| | - Natalia B Shustova
- Department of Chemistry and Biochemistry, University of South Carolina, 631 Sumter Street, Columbia, SC, 29208, USA
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17
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Rice AM, Fellows WB, Dolgopolova EA, Greytak AB, Vannucci AK, Smith MD, Karakalos SG, Krause JA, Avdoshenko SM, Popov AA, Shustova NB. Hierarchical Corannulene‐Based Materials: Energy Transfer and Solid‐State Photophysics. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201612199] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Allison M. Rice
- Department of Chemistry and Biochemistry University of South Carolina 631 Sumter Street Columbia SC 29208 USA
| | - W. Brett Fellows
- Department of Chemistry and Biochemistry University of South Carolina 631 Sumter Street Columbia SC 29208 USA
| | - Ekaterina A. Dolgopolova
- Department of Chemistry and Biochemistry University of South Carolina 631 Sumter Street Columbia SC 29208 USA
| | - Andrew B. Greytak
- Department of Chemistry and Biochemistry University of South Carolina 631 Sumter Street Columbia SC 29208 USA
| | - Aaron K. Vannucci
- Department of Chemistry and Biochemistry University of South Carolina 631 Sumter Street Columbia SC 29208 USA
| | - Mark D. Smith
- Department of Chemistry and Biochemistry University of South Carolina 631 Sumter Street Columbia SC 29208 USA
| | - Stavros G. Karakalos
- College of Engineering and Computing Swearingen Engineering Center Columbia SC 29208 USA
| | - Jeanette A. Krause
- Department of Chemistry University of Cincinnati Cincinnati OH 45221 USA
| | | | - Alexey A. Popov
- Leibniz Institute for Solid State and Materials Research 01069 Dresden Germany
| | - Natalia B. Shustova
- Department of Chemistry and Biochemistry University of South Carolina 631 Sumter Street Columbia SC 29208 USA
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18
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Spisak SN, Wei Z, Rogachev AY, Amaya T, Hirao T, Petrukhina MA. Double Concave Cesium Encapsulation by Two Charged Sumanenyl Bowls. Angew Chem Int Ed Engl 2017; 56:2582-2587. [DOI: 10.1002/anie.201610696] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2016] [Revised: 01/09/2017] [Indexed: 11/07/2022]
Affiliation(s)
- Sarah N. Spisak
- Department of Chemistry; University at Albany, State University of New York; 1400 Washington Avenue Albany NY 12222 USA
| | - Zheng Wei
- Department of Chemistry; University at Albany, State University of New York; 1400 Washington Avenue Albany NY 12222 USA
| | - Andrey Yu. Rogachev
- Department of Chemistry; Illinois Institute of Technology; Chicago IL 60616 USA
| | - Toru Amaya
- Department of Applied Chemistry; Graduate School of Engineering; Osaka University; Yamada-oka, Suita Osaka 565-0871 Japan
| | - Toshikazu Hirao
- Department of Applied Chemistry; Graduate School of Engineering; Osaka University; Yamada-oka, Suita Osaka 565-0871 Japan
- The Institute of Scientific and Industrial Research; Osaka University; Mihoga-oka, Ibaraki Osaka 567-0047 Japan
| | - Marina A. Petrukhina
- Department of Chemistry; University at Albany, State University of New York; 1400 Washington Avenue Albany NY 12222 USA
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19
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Spisak SN, Wei Z, Rogachev AY, Amaya T, Hirao T, Petrukhina MA. Double Concave Cesium Encapsulation by Two Charged Sumanenyl Bowls. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201610696] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Sarah N. Spisak
- Department of Chemistry; University at Albany, State University of New York; 1400 Washington Avenue Albany NY 12222 USA
| | - Zheng Wei
- Department of Chemistry; University at Albany, State University of New York; 1400 Washington Avenue Albany NY 12222 USA
| | - Andrey Yu. Rogachev
- Department of Chemistry; Illinois Institute of Technology; Chicago IL 60616 USA
| | - Toru Amaya
- Department of Applied Chemistry; Graduate School of Engineering; Osaka University; Yamada-oka, Suita Osaka 565-0871 Japan
| | - Toshikazu Hirao
- Department of Applied Chemistry; Graduate School of Engineering; Osaka University; Yamada-oka, Suita Osaka 565-0871 Japan
- The Institute of Scientific and Industrial Research; Osaka University; Mihoga-oka, Ibaraki Osaka 567-0047 Japan
| | - Marina A. Petrukhina
- Department of Chemistry; University at Albany, State University of New York; 1400 Washington Avenue Albany NY 12222 USA
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20
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Chen H, Wang WY, Wang L, Zhu CL, Fang XY, Qiu YQ. Ion-π interaction in impacting the nonlinear optical properties of ion-buckybowl complexes. J Mol Graph Model 2016; 64:139-146. [PMID: 26851864 DOI: 10.1016/j.jmgm.2016.01.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2015] [Revised: 01/20/2016] [Accepted: 01/21/2016] [Indexed: 10/22/2022]
Abstract
Ion-buckybowl complexes have received considerable attention in modern chemical research due to its fundamental and practical importance. Herein, we performed density functional theory (DFT) to calculate the geometical structure, binding interactions, dipole moments and the first hyperpolarizabilities (βtot) of ion-buckybowl complexes (ions are Cl(-) and Na(+), buckybowls are quadrannulene, corannulene and sumanene). It is found that the stabilities of ion-buckybowl compounds primarily originate from the interaction energy, which was proved by a new isomerization energy decomposition analysis approach. Plots of reduced density gradient mirror the ion-π weak interaction has been formed between the ions and buckybowls. Significantly, the buckybowl subunits cannot effectively impact the nonlinear optical (NLO), but the kind of ion has marked influence on the second-order NLO responses. The βtot values of Cl(-)-buckybowl complexes are all larger as compared to that of Na(+)-buckybowl complexes, which is attributed to the large charge-transfer (CT) from Cl(-) to buckybowl. Our present work will be beneficial for further theoretical and experimental studies on the NLO properties of ion-buckybowl compounds.
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Affiliation(s)
- He Chen
- Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun, Jilin 130024, People's Republic of China
| | - Wen-Yong Wang
- Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun, Jilin 130024, People's Republic of China
| | - Li Wang
- Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun, Jilin 130024, People's Republic of China
| | - Chang-Li Zhu
- Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun, Jilin 130024, People's Republic of China
| | - Xin-Yan Fang
- Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun, Jilin 130024, People's Republic of China
| | - Yong-Qing Qiu
- Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun, Jilin 130024, People's Republic of China.
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21
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Fellows WB, Rice AM, Williams DE, Dolgopolova EA, Vannucci AK, Pellechia PJ, Smith MD, Krause JA, Shustova NB. Redox-Active Corannulene Buckybowls in a Crystalline Hybrid Scaffold. Angew Chem Int Ed Engl 2015; 55:2195-9. [DOI: 10.1002/anie.201509557] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2015] [Revised: 12/02/2015] [Indexed: 11/10/2022]
Affiliation(s)
- W. Brett Fellows
- Department of Chemistry and Biochemistry; The University of South Carolina; 631 Sumter Street Columbia SC 29208 USA
| | - Allison M. Rice
- Department of Chemistry and Biochemistry; The University of South Carolina; 631 Sumter Street Columbia SC 29208 USA
| | - Derek E. Williams
- Department of Chemistry and Biochemistry; The University of South Carolina; 631 Sumter Street Columbia SC 29208 USA
| | - Ekaterina A. Dolgopolova
- Department of Chemistry and Biochemistry; The University of South Carolina; 631 Sumter Street Columbia SC 29208 USA
| | - Aaron K. Vannucci
- Department of Chemistry and Biochemistry; The University of South Carolina; 631 Sumter Street Columbia SC 29208 USA
| | - Perry J. Pellechia
- Department of Chemistry and Biochemistry; The University of South Carolina; 631 Sumter Street Columbia SC 29208 USA
| | - Mark D. Smith
- Department of Chemistry and Biochemistry; The University of South Carolina; 631 Sumter Street Columbia SC 29208 USA
| | - Jeanette A. Krause
- Department of Chemistry; The University of Cincinnati; Cincinnati OH 45221 USA
| | - Natalia B. Shustova
- Department of Chemistry and Biochemistry; The University of South Carolina; 631 Sumter Street Columbia SC 29208 USA
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22
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Fellows WB, Rice AM, Williams DE, Dolgopolova EA, Vannucci AK, Pellechia PJ, Smith MD, Krause JA, Shustova NB. Redox-Active Corannulene Buckybowls in a Crystalline Hybrid Scaffold. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201509557] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- W. Brett Fellows
- Department of Chemistry and Biochemistry; The University of South Carolina; 631 Sumter Street Columbia SC 29208 USA
| | - Allison M. Rice
- Department of Chemistry and Biochemistry; The University of South Carolina; 631 Sumter Street Columbia SC 29208 USA
| | - Derek E. Williams
- Department of Chemistry and Biochemistry; The University of South Carolina; 631 Sumter Street Columbia SC 29208 USA
| | - Ekaterina A. Dolgopolova
- Department of Chemistry and Biochemistry; The University of South Carolina; 631 Sumter Street Columbia SC 29208 USA
| | - Aaron K. Vannucci
- Department of Chemistry and Biochemistry; The University of South Carolina; 631 Sumter Street Columbia SC 29208 USA
| | - Perry J. Pellechia
- Department of Chemistry and Biochemistry; The University of South Carolina; 631 Sumter Street Columbia SC 29208 USA
| | - Mark D. Smith
- Department of Chemistry and Biochemistry; The University of South Carolina; 631 Sumter Street Columbia SC 29208 USA
| | - Jeanette A. Krause
- Department of Chemistry; The University of Cincinnati; Cincinnati OH 45221 USA
| | - Natalia B. Shustova
- Department of Chemistry and Biochemistry; The University of South Carolina; 631 Sumter Street Columbia SC 29208 USA
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23
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Dubceac C, Filatov AS, Zabula AV, Rogachev AY, Petrukhina MA. Functionalized corannulene carbocations: a structural overview. Chemistry 2015. [PMID: 26224357 DOI: 10.1002/chem.201500697] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
A detailed structural overview of a family of bowl-shaped polycyclic aromatic carbocations of the type [C20 H10 R](+) with different R functionalities tethered to the interior surface of corannulene (C20 H10 ) is provided. Changing the identity of the surface-bound groups through alkyl chains spanning from one to four carbon atoms and incorporating a different degree of halogenation has led to the fine tuning of the bowl structures and properties. The deformation of the corannulene core upon functionalization has been revealed based on X-ray crystallographic analysis and compared for the series of cations with R=CH3 , CH2 Cl, CHCl2 , CCl3 , CH2 CH3 , CH2 CH2 Cl, and CH2 CH2 Br. The resulting carbocations have been isolated with several metal-based counterions, varying in size and coordinating abilities ([AlCl4 ](-) , [AlBr4 ](-) , [(SnCl)(GaCl4 )2 ](-) , and [Al(OC(CF3 )3 )4 ](-) ). A variety of aggregation patterns in the solid state has been revealed based on different intermolecular interactions ranging from cation-anion to π-π stacking and to halogen⋅⋅⋅π interactions. For the [C20 H10 CH2 Cl](+) ion crystallized with several different counterions, the conformation of the R group attached to the central five-membered ring of corannulene moiety was found to depend on the solid-state environment defined by the identity of anions. Solution NMR and UV/Vis investigations have been used to complement the X-ray diffraction studies for this series of corannulene-based cations and to demonstrate their different association patterns with the solvent molecules.
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Affiliation(s)
- Cristina Dubceac
- Department of Chemistry, University at Albany, State University of New York, 1400 Washington Avenue, Albany, NY 12222 (USA), Fax: (+1) 518-442-3462
| | - Alexander S Filatov
- Department of Chemistry, University at Albany, State University of New York, 1400 Washington Avenue, Albany, NY 12222 (USA), Fax: (+1) 518-442-3462
| | - Alexander V Zabula
- Department of Chemistry, University of Wisconsin, 1101 University Avenue, Madison, WI 53706 (USA)
| | - Andrey Yu Rogachev
- Department of Biological and Chemical Sciences, Illinois Institute of Technology, Chicago, IL 60616 (USA)
| | - Marina A Petrukhina
- Department of Chemistry, University at Albany, State University of New York, 1400 Washington Avenue, Albany, NY 12222 (USA), Fax: (+1) 518-442-3462.
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24
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San LK, Clikeman TT, Dubceac C, Popov AA, Chen YS, Petrukhina MA, Strauss SH, Boltalina OV. Corannulene Molecular Rotor with Flexible Perfluorobenzyl Blades: Synthesis, Structure and Properties. Chemistry 2015; 21:9488-92. [DOI: 10.1002/chem.201500465] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2015] [Indexed: 11/08/2022]
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25
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Li X, Zhu Y, Shao J, Chen L, Zhao S, Wang B, Zhang S, Shao Y, Zhang H, Shao X. Ring Reconstruction on a Trichalcogenasumanene Buckybowl: A Facile Approach to Donor–Acceptor‐Type [5‐6‐7] Fused Planar Polyheterocycles. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201409620] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Xuexiang Li
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Tianshui Southern Road 222, Lanzhou 730000 (China)
| | - Yongtao Zhu
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Tianshui Southern Road 222, Lanzhou 730000 (China)
| | - Jiafeng Shao
- School of Physical Science and Technology, Lanzhou University, Tianshui Southern Road 222, Lanzhou 730000 (China)
| | - Lichuan Chen
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Tianshui Southern Road 222, Lanzhou 730000 (China)
| | - Sijie Zhao
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Tianshui Southern Road 222, Lanzhou 730000 (China)
| | - Baolin Wang
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Tianshui Southern Road 222, Lanzhou 730000 (China)
| | - Shangxi Zhang
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Tianshui Southern Road 222, Lanzhou 730000 (China)
| | - Yongliang Shao
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Tianshui Southern Road 222, Lanzhou 730000 (China)
| | - Hao‐Li Zhang
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Tianshui Southern Road 222, Lanzhou 730000 (China)
| | - Xiangfeng Shao
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Tianshui Southern Road 222, Lanzhou 730000 (China)
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26
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Li X, Zhu Y, Shao J, Chen L, Zhao S, Wang B, Zhang S, Shao Y, Zhang HL, Shao X. Ring reconstruction on a trichalcogenasumanene buckybowl: a facile approach to donor-acceptor-type [5-6-7] fused planar polyheterocycles. Angew Chem Int Ed Engl 2014; 54:267-71. [PMID: 25378279 DOI: 10.1002/anie.201409620] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2014] [Revised: 10/20/2014] [Indexed: 11/06/2022]
Abstract
The transformation of trichalcogenasumanene buckybowls into donor-acceptor-type [5-6-7] fused polyheterocycles is disclosed. The strategy involves a highly efficient ring-opening of the flanking benzene upon oxidation at room temperature, and facile ring closure by functional-group transformation. Crystallographic studies indicate that the resulting [5-6-7] fused polyheterocycles possess a planar conformation owing to the release of ring strain by expansion of one of the six-membered flanking rings to the seven-membered one. Additionally, the [5-6-7] fused polyheterocycles bear electron-withdrawing groups, which reduce the HOMO-LUMO energy gap, and display broad absorption bands extending to λ=590 nm. Consequently, these compounds show strong red emission with fluorescence quantum yields of up to 38 %.
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Affiliation(s)
- Xuexiang Li
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Tianshui Southern Road 222, Lanzhou 730000 (China)
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