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Nano-saturn and ExBox systems: Dominant role of steric, exchange-correlation, and electrostatic effects. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2021.139151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Dumele O, Grabicki N. Confining the Inner Space of Strained Carbon Nanorings. Synlett 2021. [DOI: 10.1055/s-0040-1719853] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
AbstractStrained aromatic macrocycles based on cycloparaphenylenes (CPPs) are the shortest repeating units of armchair single-walled carbon nanotubes. Since the development of several new synthetic methodologies for accessing these structures, their properties have been extensively studied. Besides the fundamental interest in these novel molecular scaffolds, their application in the field of materials science is an ongoing topic of research. Most of the reported CPP-type macrocycles display strong binding toward fullerenes, due to the perfect match between the convex and concave π-surfaces of fullerenes and CPPs, respectively. Highly functionalized CPP derivatives capable of supramolecular binding with other molecules are rarely reported. The synthesis of highly functionalized [n]cyclo-2,7-pyrenylenes leads to CPP-type macrocycles with a defined cavity capable of binding non-fullerene guests with high association constants.
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Kajiyama K, Tsurumaki E, Wakamatsu K, Fukuhara G, Toyota S. Complexation of an Anthracene-Triptycene Nanocage Host with Fullerene Guests through CH⋅⋅⋅π Contacts. Chempluschem 2021; 86:716-722. [PMID: 33620779 DOI: 10.1002/cplu.202000816] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Revised: 02/11/2021] [Indexed: 12/22/2022]
Abstract
A bicyclic anthracene macrocycle containing two triptycene units at the bridgehead positions was synthesized by Ni-mediated coupling of the corresponding precursor as a cage-shaped aromatic hydrocarbon host. This cage host formed an inclusion complex with C60 or C70 guest in 1 : 1 ratio in solution. The association constants (Ka ) determined by the fluorescence titration method were 1.3×104 and 3.3×105 L mol -1 for the C60 and C70 complexes, respectively, at 298 K in toluene. DFT calculations revealed that the guest molecules were included in the middle of the cavity with several CH⋅⋅⋅π contacts. The strong affinity of the cage host for the fullerene guests and the high selectivity toward C70 are discussed on the basis of spectroscopic and structural data.
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Affiliation(s)
- Kazuki Kajiyama
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Eiji Tsurumaki
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Kan Wakamatsu
- Department of Chemistry, Faculty of Science, Okayama University of Science, 1-1 Ridaicho, Kita-ku, Okayama, 700-0005, Japan
| | - Gaku Fukuhara
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8551, Japan.,JST, PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan
| | - Shinji Toyota
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8551, Japan
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Singh N, Singh R, Joshi KB, Verma S. Constitutionally Isomeric Aromatic Tripeptides: Self-Assembly and Metal-Ion-Modulated Transformations. Chempluschem 2020; 85:2001-2009. [PMID: 32876402 DOI: 10.1002/cplu.202000464] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Revised: 08/10/2020] [Indexed: 12/21/2022]
Abstract
Self-assembling peptides based on aromatic amino acids can adopt diverse nanostructures which primarily depend on their molecular structures. Therefore, to understand the nature of self-assembly on the molecular level we rationally designed two constitutional isomers of short aromatic peptides. The first isomer consists of a tyrosine moiety at the N-terminus and the second isomer consists of a tyrosine moiety at the C-terminus of the FF peptide, a core recognition motif of Amyloid β peptides. Therefore, it can be considered that both the designed tripeptides are the analogues of the FFF peptide with only atomic(-H) level replacement by -OH functional group on the first and last phenyl ring, respectively. The first isomer self-assembled into 2D porous nanosheets ("Nanowebs"), however the second isomers produced toroidal shapes with central spheres ("Nano-Saturn" like assemblies). Interestingly, the presence of the transition-metal ions (copper, zinc and iron) triggered the self-assembly of both the peptides into fibrous circular discs, nanomats and nanoplates like assembly.
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Affiliation(s)
- Narendra Singh
- Department of Chemistry, Indian Institute of Technology-Kanpur, Kanpur, 208016, India
| | - Ramesh Singh
- Department of Chemistry, School of Chemical Science and Technology, Dr. Harisingh Gour Central University, Sagar, MP, 470003, India
| | - Khashti Ballabh Joshi
- Department of Chemistry, School of Chemical Science and Technology, Dr. Harisingh Gour Central University, Sagar, MP, 470003, India
| | - Sandeep Verma
- Department of Chemistry, Indian Institute of Technology-Kanpur, Kanpur, 208016, India
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Toyota S, Wakamatsu K. Theoretical Studies of Structures and Conformational Analysis of Anthracene-2,7-diyl Cyclic Oligomers. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2020. [DOI: 10.1246/bcsj.20190280] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Shinji Toyota
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Kan Wakamatsu
- Department of Chemistry, Faculty of Science, Okayama University of Science, 1-1 Ridaicho, Kita-ku, Okayama 700-0005, Japan
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Bachrach SM, Rzepa HS. Cycloparaphenylene Möbius trefoils. Chem Commun (Camb) 2020; 56:13567-13570. [DOI: 10.1039/d0cc04190d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
DFT computations (ωB97X-D/6-31G(d)) of eight different cycloparaphenylenes that have three internal linking groups are shown to have two different conformations that express interesting Möbius topologies.
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Affiliation(s)
| | - Henry S. Rzepa
- Department of Chemistry
- Molecular Sciences Research Hub
- Imperial College London
- London W12 OBZ
- UK
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Affiliation(s)
- Steven M. Bachrach
- School of Science, Monmouth University, 400 Cedar Avenue, West Long Branch, New Jersey 07764, United States
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Toyota S, Yamamoto Y, Wakamatsu K, Tsurumaki E, Muñoz-Castro A. Nano-Saturn with an Ellipsoidal Body: Anthracene Macrocyclic Ring–C70 Complex. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2019. [DOI: 10.1246/bcsj.20190133] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Shinji Toyota
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Yuta Yamamoto
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Kan Wakamatsu
- Department of Chemistry, Faculty of Science, Okayama University of Science, 1-1 Ridaicho, Kita-ku, Okayama 700-0005, Japan
| | - Eiji Tsurumaki
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Alvaro Muñoz-Castro
- Laboratorio de Química Inorgánica y Materiales Moleculares Universidad Autonoma de Chile, Llano Subercaceaux, 2801 San Miguel, Santiago, Chile
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Affiliation(s)
- Youzhi Xu
- Institut für Organische Chemie und Neue MaterialienUniversität Ulm Albert-Einstein-Allee 11 89081 Ulm Deutschland
| | - Max Delius
- Institut für Organische Chemie und Neue MaterialienUniversität Ulm Albert-Einstein-Allee 11 89081 Ulm Deutschland
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Xu Y, von Delius M. The Supramolecular Chemistry of Strained Carbon Nanohoops. Angew Chem Int Ed Engl 2019; 59:559-573. [PMID: 31190449 DOI: 10.1002/anie.201906069] [Citation(s) in RCA: 128] [Impact Index Per Article: 25.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Indexed: 01/24/2023]
Abstract
Since 1996, a growing number of strained macrocycles, comprising only sp2 - or sp-hybridized carbon atoms within the ring, have become synthetically accessible, with the [n]cycloparaphenyleneacetylenes (CPPAs) and the [n]cycloparaphenylenes (CPPs) being the most prominent examples. Now that robust and relatively general synthetic routes toward a diverse range of nanohoop structures have become available, the research focus is beginning to shift towards the exploration of their properties and applications. From a supramolecular chemistry perspective, these macrocycles offer unique opportunities as a result of their near-perfect circular shape, the unusually high degree of shape-persistence, and the presence of both convex and concave π-faces. In this Minireview, we give an overview on the use of strained carbon-rich nanohoops in host-guest chemistry, the preparation of mechanically interlocked architectures, and crystal engineering.
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Affiliation(s)
- Youzhi Xu
- Institute of Organic Chemistry and Advanced Materials, University of Ulm, Albert-Einstein-Allee 11, 89081, Ulm, Germany
| | - Max von Delius
- Institute of Organic Chemistry and Advanced Materials, University of Ulm, Albert-Einstein-Allee 11, 89081, Ulm, Germany
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