1
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Haino T, Nitta N. Supramolecular Synthesis of Star Polymers. Chempluschem 2024; 89:e202400014. [PMID: 38407573 DOI: 10.1002/cplu.202400014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2024] [Revised: 02/25/2024] [Accepted: 02/26/2024] [Indexed: 02/27/2024]
Abstract
Supramolecular polymers, in which monomers are assembled via intermolecular interactions, have been extensively studied. The fusion of supramolecular polymers with conventional polymers has attracted the attention of many researchers. In this review article, the recent progress in the construction of supramolecular star polymers, including regular star polymers and miktoarm star polymers, is discussed. The initial sections briefly provide an overview of the conventional classification and synthesis methods for star polymers. Coordination-driven self-assembly was investigated for the supramolecular synthesis of star polymers. Star polymers with multiple polymer chains radiating from metal-organic polyhedra (MOPs) have also been described. Particular focus has been placed on the synthesis of star polymers featuring supramolecular cores formed through hydrogen-bonding-directed self-assembly. After describing the synthesis of star polymers based on host-guest complexes, the construction of miktoarm star polymers based on the molecular recognition of coordination capsules is detailed.
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Affiliation(s)
- Takeharu Haino
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashihiroshima, Higashi-Hiroshima, 739-8526, Japan
- International Institute for Sustainability with Knotted Chiral Meta Matter (WPI-SKCM2), Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8527, Japan
| | - Natsumi Nitta
- Pritzker School of Molecular Engineering, The University of Chicago, 5640 South Elise Avenue, Chicago, Illinois, 60637, United States
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2
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Harada K, Sekiya R, Haino T. Kinetic Resolution of Secondary Alcohols Catalyzed at the Exterior of Chiral Coordinated Capsules. Chemistry 2024; 30:e202304244. [PMID: 38240735 DOI: 10.1002/chem.202304244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Accepted: 01/19/2024] [Indexed: 02/07/2024]
Abstract
Confined spaces inside molecular hosts can function as reaction vessels. However, this concept significantly limits the scope of reactants. When the exterior of molecular hosts is used instead, we can ease the restriction because reactants are not necessary to be trapped inside molecular hosts, although studies along this line have not been reported. As a proof-of-concept of enantioselective reactions at the exterior of chiral molecular hosts, we utilized host-guest complexes of enantiomerically enriched Cu-coordinated capsules and guests possessing a catalytic center to realize the kinetic resolution of secondary alcohols. Under suitable reaction conditions, a selectivity factor of 2.6 was realized, demonstrating that the reactions occur at the exterior of the capsules. A series of experiments indicated that the substituents on the 2,2'-bipyridyl arms and the alkyl chains on the lower rim contributed to the enantioselectivity of the reactions.
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Affiliation(s)
- Kentaro Harada
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan
| | - Ryo Sekiya
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan
| | - Takeharu Haino
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan
- International Institute for Sustainability with Knotted Chiral Meta Matter (WPI-SKCM2), Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8527, Japan
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3
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Harada K, Sekiya R, Haino T. Molecular Recognition Process in Resorcinarene-based Coordination Capsules. Chemistry 2023; 29:e202302581. [PMID: 37707311 DOI: 10.1002/chem.202302581] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Revised: 09/10/2023] [Accepted: 09/14/2023] [Indexed: 09/15/2023]
Abstract
Cu and Ag capsules can take up various organic molecules. Their molecular recognition possibly involves partial dissociation and slippage. We investigated molecular recognition processes in the Cu and Ag capsules by CD and 1 H NMR spectroscopy and employed 4,4'-diacetoxy biphenyl carrying two benzothiadiazole groups as a probe. CD and 1 H NMR measurements reveal that the host-guest complexation proceeds under second-order reactions and that these capsules undergo the partial dissociation to take up the probe in [D1 ]chloroform and [D8 ]THF. The slippage also contributes to host-guest complexation for a Cu capsule that carries p-methoxyphenyl groups on the 2,2'-bipyridiyl arms. DFT calculations suggest that π/π stacking interactions between the electron-rich p-methoxyphenyl group and the electron-poor 2,2'-bipyridyl arm elongate the capsule, allowing the guest to access the cavity without the partial dissociation.
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Affiliation(s)
- Kentaro Harada
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan
| | - Ryo Sekiya
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan
| | - Takeharu Haino
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan
- International Institute for Sustainability with Knotted Chiral Meta Matter (WPI-SKCM2), Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8527, Japan
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4
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Gao WB, Li Z, Tong T, Dong X, Qu H, Yang L, Sue ACH, Tian ZQ, Cao XY. Chiral Molecular Cage with Tunable Stereoinversion Barriers. J Am Chem Soc 2023; 145:17795-17804. [PMID: 37527407 DOI: 10.1021/jacs.3c04761] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/03/2023]
Abstract
The manipulation of chirality in molecular entities that rapidly interconvert between enantiomeric forms is challenging, particularly at the supramolecular level. Advances in controlling such dynamic stereochemical systems offer opportunities to understand chiral symmetry breaking and homochirality. Herein, we report the synthesis of a face-rotating tetrahedron (FRT), an organic molecular cage composed of tridurylborane facial units that undergo stereomutations between enantiomeric trefoil propeller-like conformations. After resolution, we show that the racemization barrier of the enantiopure FRT can be regulated in situ through the reversible binding of fluoride anions onto the tridurylborane moieties. Furthermore, the addition of an enantiopure phenylethanol to the FRT can effectively induce chirality of the molecular cage by preferentially binding to one of its enantiomeric conformers. This study presents a new paradigm for controlling dynamic chirality in supramolecular systems, which may have implications for asymmetric synthesis and dynamic stereochemistry.
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Affiliation(s)
- Wen-Bin Gao
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Key Laboratory of Chemical Biology of Fujian Province, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Zhihao Li
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Key Laboratory of Chemical Biology of Fujian Province, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Tianyi Tong
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Key Laboratory of Chemical Biology of Fujian Province, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Xue Dong
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Key Laboratory of Chemical Biology of Fujian Province, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Hang Qu
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Key Laboratory of Chemical Biology of Fujian Province, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Liulin Yang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Key Laboratory of Chemical Biology of Fujian Province, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Andrew C-H Sue
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Key Laboratory of Chemical Biology of Fujian Province, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Zhong-Qun Tian
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Key Laboratory of Chemical Biology of Fujian Province, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Xiao-Yu Cao
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Key Laboratory of Chemical Biology of Fujian Province, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
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Ziganshina AY, Mansurova EE, Antipin IS. Colloids Based on Calixresorcins for the Adsorption, Conversion, and Delivery of Bioactive Substances. COLLOID JOURNAL 2022. [DOI: 10.1134/s1061933x22700028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Harada K, Sekiya R, Haino T. Chirality Induction on a Coordination Capsule for Circularly Polarized Luminescence. Angew Chem Int Ed Engl 2022; 61:e202209340. [DOI: 10.1002/anie.202209340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2022] [Indexed: 11/08/2022]
Affiliation(s)
- Kentaro Harada
- Department of Chemistry Graduate School of Advanced Science and Engineering Hiroshima University 1-3-1 Kagamiyama, Higashi-Hiroshima Hiroshima 739-8526 Japan
| | - Ryo Sekiya
- Department of Chemistry Graduate School of Advanced Science and Engineering Hiroshima University 1-3-1 Kagamiyama, Higashi-Hiroshima Hiroshima 739-8526 Japan
| | - Takeharu Haino
- Department of Chemistry Graduate School of Advanced Science and Engineering Hiroshima University 1-3-1 Kagamiyama, Higashi-Hiroshima Hiroshima 739-8526 Japan
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Harada K, Sekiya R, Haino T. Chirality Induction on a Coordination Capsule for Circularly Polarized Luminescence. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202209340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Kentaro Harada
- Hiroshima Daigaku - Higashihiroshima Campus: Hiroshima Daigaku chemistry 1-3-1 Kagamiyama 739-8526 Higashi-Hiroshima JAPAN
| | - Ryo Sekiya
- Hiroshima Daigaku - Higashihiroshima Campus: Hiroshima Daigaku Chemistry 1-3-1 Kagamiayam 739-8526 Higashi-Hiroshima JAPAN
| | - Takeharu Haino
- Hiroshima Daigaku - Higashihiroshima Campus: Hiroshima Daigaku Department of Chemistry 1-3-1 Kagamiyama 739-8526 Higashi-Hiroshima JAPAN
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Haino T, Sekiya R, Harada K, Nitta N. Resorcinarene-Based Supramolecular Capsules: Supramolecular Functions and Applications. Synlett 2021. [DOI: 10.1055/a-1679-8141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
AbstractA resorcinarene is a synthetic macrocycle consisting of four resorcinol molecules covalently linked by methylene bridges. The interannular bridges produce a cavitand that has a bowl-shaped structure. We have developed supramolecular capsules through Ag(I) or Cu(I) coordination-driven self-assembly of cavitands possessing 2,2′-bipyridyl arms in their upper rims. The self-assembled capsules accommodate various molecular guests and supramolecular assemblies possessing acetoxy groups. The host–guest chemistry of the molecular capsules has been applied in the fabrication of supramolecular polymers. This account describes recent developments in the supramolecular chemistry of resorcinarene-based coordination capsules and provides a brief history of resorcinarene-based capsules and related capsules.
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Chen Y, Wu G, Chen B, Qu H, Jiao T, Li Y, Ge C, Zhang C, Liang L, Zeng X, Cao X, Wang Q, Li H. Self‐Assembly of a Purely Covalent Cage with Homochirality by Imine Formation in Water. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202106428] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Yixin Chen
- Department of Chemistry Zhejiang University Hangzhou 310027 China
| | - Guangcheng Wu
- Department of Chemistry Zhejiang University Hangzhou 310027 China
| | - Binbin Chen
- Department of Chemistry Zhejiang University Hangzhou 310027 China
| | - Hang Qu
- State Key Laboratory of Physical Chemistry of Solid Surfaces iChEM and College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China
| | - Tianyu Jiao
- Department of Chemistry Zhejiang University Hangzhou 310027 China
| | - Yintao Li
- Department of Chemistry Zhejiang University Hangzhou 310027 China
| | - Chenqi Ge
- Department of Chemistry Zhejiang University Hangzhou 310027 China
| | - Chi Zhang
- Department of Chemistry Zhejiang University Hangzhou 310027 China
| | - Lixin Liang
- Department of Chemistry Zhejiang University Hangzhou 310027 China
| | - Xiuqiong Zeng
- Department of Chemistry Zhejiang University Hangzhou 310027 China
| | - Xiaoyu Cao
- State Key Laboratory of Physical Chemistry of Solid Surfaces iChEM and College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China
| | - Qi Wang
- Department of Chemistry Zhejiang University Hangzhou 310027 China
| | - Hao Li
- Department of Chemistry Zhejiang University Hangzhou 310027 China
- ZJU-Hangzhou Global Scientific and Technological Innovation Center Hangzhou 311215 China
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10
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Chen Y, Wu G, Chen B, Qu H, Jiao T, Li Y, Ge C, Zhang C, Liang L, Zeng X, Cao X, Wang Q, Li H. Self-Assembly of a Purely Covalent Cage with Homochirality by Imine Formation in Water. Angew Chem Int Ed Engl 2021; 60:18815-18820. [PMID: 34129262 DOI: 10.1002/anie.202106428] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Revised: 06/04/2021] [Indexed: 11/11/2022]
Abstract
Self-assembly of host molecules in aqueous media via metal-ligand coordination is well developed. However, the preparation of purely covalent counterparts in water has remained a formidable task. An anionic tetrahedron cage was successfully self-assembled in a [4+4] manner by condensing a trisamine and a trisformyl in water. Even although each individual imine bond is rather labile and apt to hydrolyze in water, the tetrahedron is remarkably stable or inert due to multivalence. The tetrahedral cages, as well as its neutral counterparts dissolved in organic solvent, have homochirality, namely that their four propeller-shaped trisformyl residues adopt the same rotational conformation. The cage is able to take advantage of hydrophobic effect to accommodate a variety of guest molecules in water. When a chiral guest was recognized, the formation of one enantiomer of the cage became more favored relative to the other. As a consequence, the cage could be produced in an enantioselective manner. The tetrahedron is able to maintain its chirality after removal of the chiral guest-probably on account of the cooperative occurrence of intramolecular forces that restrict the intramolecular flipping of phenyl units in the cage framework.
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Affiliation(s)
- Yixin Chen
- Department of Chemistry, Zhejiang University, Hangzhou, 310027, China
| | - Guangcheng Wu
- Department of Chemistry, Zhejiang University, Hangzhou, 310027, China
| | - Binbin Chen
- Department of Chemistry, Zhejiang University, Hangzhou, 310027, China
| | - Hang Qu
- State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China
| | - Tianyu Jiao
- Department of Chemistry, Zhejiang University, Hangzhou, 310027, China
| | - Yintao Li
- Department of Chemistry, Zhejiang University, Hangzhou, 310027, China
| | - Chenqi Ge
- Department of Chemistry, Zhejiang University, Hangzhou, 310027, China
| | - Chi Zhang
- Department of Chemistry, Zhejiang University, Hangzhou, 310027, China
| | - Lixin Liang
- Department of Chemistry, Zhejiang University, Hangzhou, 310027, China
| | - Xiuqiong Zeng
- Department of Chemistry, Zhejiang University, Hangzhou, 310027, China
| | - Xiaoyu Cao
- State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China
| | - Qi Wang
- Department of Chemistry, Zhejiang University, Hangzhou, 310027, China
| | - Hao Li
- Department of Chemistry, Zhejiang University, Hangzhou, 310027, China.,ZJU-Hangzhou Global Scientific and Technological Innovation Center, Hangzhou, 311215, China
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Harada K, Sekiya R, Haino T. Folding and Unfolding of Acetoxy Group-Terminated Alkyl Chains Inside a Size-Regulable Hemicarcerand. J Org Chem 2021; 86:4440-4447. [PMID: 33541083 DOI: 10.1021/acs.joc.0c02833] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
A resorcinarene-based hemicarcerand, which consists of two cavitands covalently linked to each other by four alkyl chains, allows structural expansion and contraction by demetalation and metalation of Cu(I) cations with a size change of approximately 12 Å. This metal-mediated switching of the two states regulates the conformations of acetoxy group-terminated alkyl chains. A guest binding study reveals the encapsulation of heptyl to undecyl chains in metal-free and Cu(I)-coordinated capsules. The chemical shifts of the acetoxy groups of the bound guests are the same in the metal-free capsule, while those in the Cu(I)-coordinated one differ from each other. This indicates that the metal-free capsule regulates its size to the bound guests, while the bound guests adopt their conformations to the cavity of the Cu(I)-coordinated capsules. 1H NMR measurements and molecular mechanics calculations suggest that the bound guests have extended conformations in the metal-free capsule, while the Cu(I)-coordinated capsule forces the bound guests to adopt folded conformations. The presence of folded conformations is supported by the conformational study with structurally similar capsules and a nonsymmetric guest, allowing us to observe nuclear Overhauser effects stemming from the folded conformations of the guest in the cavity.
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Affiliation(s)
- Kentaro Harada
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Ryo Sekiya
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Takeharu Haino
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan
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Nakamura T, Yonemura S, Akatsuka S, Nabeshima T. Synthesis of Single Isomeric Complexes with Dissymmetric Structures Using Macrocyclic Homooligomers. Angew Chem Int Ed Engl 2020; 60:3080-3086. [DOI: 10.1002/anie.202011348] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2020] [Indexed: 01/19/2023]
Affiliation(s)
- Takashi Nakamura
- Faculty of Pure and Applied Sciences and Tsukuba Research Center for Energy Materials Science (TREMS) University of Tsukuba 1-1-1 Tennodai Tsukuba Ibaraki 305-8571 Japan
| | - Sota Yonemura
- Faculty of Pure and Applied Sciences and Tsukuba Research Center for Energy Materials Science (TREMS) University of Tsukuba 1-1-1 Tennodai Tsukuba Ibaraki 305-8571 Japan
| | - Shunya Akatsuka
- Faculty of Pure and Applied Sciences and Tsukuba Research Center for Energy Materials Science (TREMS) University of Tsukuba 1-1-1 Tennodai Tsukuba Ibaraki 305-8571 Japan
| | - Tatsuya Nabeshima
- Faculty of Pure and Applied Sciences and Tsukuba Research Center for Energy Materials Science (TREMS) University of Tsukuba 1-1-1 Tennodai Tsukuba Ibaraki 305-8571 Japan
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Nakamura T, Yonemura S, Akatsuka S, Nabeshima T. Synthesis of Single Isomeric Complexes with Dissymmetric Structures Using Macrocyclic Homooligomers. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202011348] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Takashi Nakamura
- Faculty of Pure and Applied Sciences and Tsukuba Research Center for Energy Materials Science (TREMS) University of Tsukuba 1-1-1 Tennodai Tsukuba Ibaraki 305-8571 Japan
| | - Sota Yonemura
- Faculty of Pure and Applied Sciences and Tsukuba Research Center for Energy Materials Science (TREMS) University of Tsukuba 1-1-1 Tennodai Tsukuba Ibaraki 305-8571 Japan
| | - Shunya Akatsuka
- Faculty of Pure and Applied Sciences and Tsukuba Research Center for Energy Materials Science (TREMS) University of Tsukuba 1-1-1 Tennodai Tsukuba Ibaraki 305-8571 Japan
| | - Tatsuya Nabeshima
- Faculty of Pure and Applied Sciences and Tsukuba Research Center for Energy Materials Science (TREMS) University of Tsukuba 1-1-1 Tennodai Tsukuba Ibaraki 305-8571 Japan
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Nakamura T, Feng RY, Nabeshima T. A Sandwich‐Shaped Hexanuclear Silver Complex with a Giant Cavity Constructed from a Macrocycle with Inward Chelating Units. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000882] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Takashi Nakamura
- Faculty of Pure and Applied Sciences and Tsukuba Research Center for Energy Materials Science (TREMS) University of Tsukuba 1-1-1 Tennodai Tsukuba Ibaraki 305–8571 Japan
| | - Rui Yun Feng
- Faculty of Pure and Applied Sciences and Tsukuba Research Center for Energy Materials Science (TREMS) University of Tsukuba 1-1-1 Tennodai Tsukuba Ibaraki 305–8571 Japan
| | - Tatsuya Nabeshima
- Faculty of Pure and Applied Sciences and Tsukuba Research Center for Energy Materials Science (TREMS) University of Tsukuba 1-1-1 Tennodai Tsukuba Ibaraki 305–8571 Japan
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15
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Affiliation(s)
- Daisuke Shimoyama
- Department of Chemistry Graduate School of Advanced Science and Engineering Hiroshima University 1-3-1 Kagamiyama Higashi Hiroshima 739-8526 Japan
| | - Takeharu Haino
- Department of Chemistry Graduate School of Advanced Science and Engineering Hiroshima University 1-3-1 Kagamiyama Higashi Hiroshima 739-8526 Japan
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16
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Nitta N, Takatsuka M, Kihara S, Hirao T, Haino T. Self‐Healing Supramolecular Materials Constructed by Copolymerization via Molecular Recognition of Cavitand‐Based Coordination Capsules. Angew Chem Int Ed Engl 2020; 59:16690-16697. [DOI: 10.1002/anie.202006604] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Revised: 06/04/2020] [Indexed: 01/08/2023]
Affiliation(s)
- Natsumi Nitta
- Graduate School of Science Hiroshima University 1-3-1 Kagamiyama Higashi-Hiroshima 739-8526 Japan
| | - Mei Takatsuka
- Graduate School of Science Hiroshima University 1-3-1 Kagamiyama Higashi-Hiroshima 739-8526 Japan
| | - Shin‐ichi Kihara
- Graduate School of Advanced Science and Engineering Hiroshima University 1-3-1 Kagamiyama Higashi-Hiroshima 739-8526 Japan
| | - Takehiro Hirao
- Graduate School of Advanced Science and Engineering Hiroshima University 1-3-1 Kagamiyama Higashi-Hiroshima 739-8526 Japan
| | - Takeharu Haino
- Graduate School of Advanced Science and Engineering Hiroshima University 1-3-1 Kagamiyama Higashi-Hiroshima 739-8526 Japan
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Nitta N, Takatsuka M, Kihara S, Hirao T, Haino T. Self‐Healing Supramolecular Materials Constructed by Copolymerization via Molecular Recognition of Cavitand‐Based Coordination Capsules. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202006604] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Natsumi Nitta
- Graduate School of Science Hiroshima University 1-3-1 Kagamiyama Higashi-Hiroshima 739-8526 Japan
| | - Mei Takatsuka
- Graduate School of Science Hiroshima University 1-3-1 Kagamiyama Higashi-Hiroshima 739-8526 Japan
| | - Shin‐ichi Kihara
- Graduate School of Advanced Science and Engineering Hiroshima University 1-3-1 Kagamiyama Higashi-Hiroshima 739-8526 Japan
| | - Takehiro Hirao
- Graduate School of Advanced Science and Engineering Hiroshima University 1-3-1 Kagamiyama Higashi-Hiroshima 739-8526 Japan
| | - Takeharu Haino
- Graduate School of Advanced Science and Engineering Hiroshima University 1-3-1 Kagamiyama Higashi-Hiroshima 739-8526 Japan
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Nakamura M, Tsukamoto Y, Ueta T, Sei Y, Fukushima T, Yoza K, Kobayashi K. Cavitand-Based Pd-Pyridyl Coordination Capsules: Guest-Induced Homo- or Heterocapsule Selection and Applications of Homocapsules to the Protection of a Photosensitive Guest and Chiral Capsule Formation. Chem Asian J 2020; 15:2218-2230. [PMID: 32495490 DOI: 10.1002/asia.202000603] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Indexed: 11/08/2022]
Abstract
A 2 : 4 mixture of tetrakis[4-(4-pyridyl)phenyl]cavitand (1) or tetrakis[4-(4-pyridyl)phenylethynyl]cavitand (2) and Pd(dppp)(OTf)2 self-assembles into a homocapsule {12 ⋅ [Pd(dppp)]4 }8+ ⋅ (TfO- )8 (C1) or {22 ⋅ [Pd(dppp)]4 }8+ ⋅ (TfO- )8 (C2), respectively, through Pd-Npy coordination bonds. A 1 : 1 : 4 mixture of 1, 2, and Pd(dppp)(OTf)2 produced a mixture of homocapsules C1, C2, and a heterocapsule {1 ⋅ 2 ⋅ [Pd(dppp)]4 }8+ ⋅ (TfO- )8 (C3) in a 1 : 1 : 0.98 mole ratio. Selective formation (self-sorting) of homocapsules C1 and C2 or heterocapsule C3 was controlled by guest-induced encapsulation under thermodynamic control. Applications of Pd-Npy coordination capsules with the use of 1 were demonstrated. Capsule C1 serves as a guard nanocontainer for trans-4,4'-diacetoxyazobenzene to protect against the trans-to-cis photoisomerization by encapsulation. A chiral capsule {12 ⋅ [Pd((R)-BINAP)]4 }8+ ⋅ (TfO- )8 (C5) was also constructed. Capsule C5 induces supramolecular chirality with respect to prochiral 2,2'-bis(alkoxycarbonyl)-4,4'-bis(1-propynyl)biphenyls by diastereomeric encapsulation through the asymmetric suppression of rotation around the axis of the prochiral biphenyl moiety.
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Affiliation(s)
- Munechika Nakamura
- Department of Chemistry Faculty of Science, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka, 422-8529, Japan
| | - Yoshimi Tsukamoto
- Department of Chemistry Faculty of Science, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka, 422-8529, Japan
| | - Takuro Ueta
- Department of Chemistry Faculty of Science, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka, 422-8529, Japan
| | - Yoshihisa Sei
- Laboratory for Chemistry and Life Science Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan
| | - Takanori Fukushima
- Laboratory for Chemistry and Life Science Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan
| | - Kenji Yoza
- Bruker axs, 3-9-B Moriya, Kanagawa-ku, Yokohama, 221-0022, Japan
| | - Kenji Kobayashi
- Department of Chemistry Faculty of Science, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka, 422-8529, Japan.,Research Institute of Green Science and Technology, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka, 422-8529, Japan
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19
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Harada K, Sekiya R, Haino T. A Regulable Internal Cavity inside a Resorcinarene-Based Hemicarcerand. Chemistry 2020; 26:5810-5817. [PMID: 32011768 DOI: 10.1002/chem.201905805] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2019] [Indexed: 01/29/2023]
Abstract
Covalent organic capsules, such as carcerands and hemicarcerands, are an interesting class of molecular hosts. These container molecules have confined spaces capable of hosting small molecules, although the fact that the size of the inner cavities cannot be changed substantially limits the scope of their applications. The title covalently linked container was produced by metal-directed dimerization of a resorcinarene-based cavitand having four 2,2'-bipyridyl arms on the wide rim followed by olefin metathesis at the vertices of the resulting capsule with a second-generation Grubbs catalyst. The covalently linked bipyridyl arms permit expansion of the inner cavity by demetalation. This structural change influences the molecular recognition properties; the metal-coordinated capsule recognizes only 4,4'-diacetoxybiphenyl, whereas the metal-free counterpart can encapsulate not only 4,4'-diacetoxybiphenyl, but also 2,5-disubstituted-1,4-bis(4-acetoxyphenylethynyl)benzene, which is 9.4 Å longer than the former guest. Molecular mechanics calculations predict that the capsule expands the internal cavity to encapsulate the long guest by unfolding the folded conformation of the alkyl chains, which demonstrates the flexible and regulable nature of the cavity. Guest competition experiments show that the preferred guest can be switched by metalation and demetalation. This external-stimuli-responsive guest exchange can be utilized for the development of functional supramolecular systems controlling the uptake, transport, and release of chemicals.
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Affiliation(s)
- Kentaro Harada
- Department of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan
| | - Ryo Sekiya
- Department of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan
| | - Takeharu Haino
- Department of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan
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20
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Shimoyama D, Sekiya R, Haino T. Upper-rim functionalization and supramolecular polymerization of a feet-to-feet-connected biscavitand. Chem Commun (Camb) 2020; 56:3733-3736. [DOI: 10.1039/d0cc00933d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
An octaiodobiscavitand was synthesized via an aromatic Finkelstein iodination reaction in good yield. An octa-functionalized biscavitand self-assembled to form a supramolecular polymer in the solid state.
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Affiliation(s)
- Daisuke Shimoyama
- Department of Chemistry
- Graduate School of Science
- Hiroshima University
- Higashi-Hiroshima
- Japan
| | - Ryo Sekiya
- Department of Chemistry
- Graduate School of Science
- Hiroshima University
- Higashi-Hiroshima
- Japan
| | - Takeharu Haino
- Department of Chemistry
- Graduate School of Science
- Hiroshima University
- Higashi-Hiroshima
- Japan
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21
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Yu M, Yang J, Xu X, Ma J, Wang Z. Highly stable polyoxometalate‐resorcin[4]arene‐based inorganic‐organic complexes for catalytic oxidation desulfurization. Appl Organomet Chem 2019. [DOI: 10.1002/aoc.5169] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Ming‐Yue Yu
- Key Lab for Polyoxometalate Science, Department of ChemistryNortheast Normal University Changchun 130024 China
| | - Jin Yang
- Key Lab for Polyoxometalate Science, Department of ChemistryNortheast Normal University Changchun 130024 China
| | - Xianxiu Xu
- College of Chemistry, Chemical Engineering and Materials Science, Key Laboratory of Molecular and Nano Probes, Ministry of EducationShandong Normal University Jinan 250014 China
| | - Jian‐Fang Ma
- Key Lab for Polyoxometalate Science, Department of ChemistryNortheast Normal University Changchun 130024 China
| | - Zhenxing Wang
- Wuhan National High Magnetic Field Center & School of PhysicsHuazhong University of Science and Technology Wuhan Hubei 430074 China
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22
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Resolution and Racemization of a Planar-Chiral A1/A2-Disubstituted Pillar[5]arene. Symmetry (Basel) 2019. [DOI: 10.3390/sym11060773] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Butoxycarbonyl (Boc)-protected pillar[4]arene[1]-diaminobenzene (BP) was synthesized by introducing the Boc protection onto the A1/A2 positions of BP. The oxygen-through-annulus rotation was partially inhibited because of the presence of the middle-sized Boc substituents. We succeeded in isolating the enantiopure RP (RP, RP, RP, RP, and RP)- and SP (SP, SP, SP, SP, and SP)-BP, and studied their circular dichroism (CD) spectral properties. As the Boc substituent is not large enough to completely prevent the flip of the benzene units, enantiopure BP-f1 underwent racemization in solution. It is found that the racemization kinetics is a function of the solvent and temperature employed. The chirality of the BP-f1 could be maintained in n-hexane and CH2Cl2 for a long period at room temperature, whereas increasing the temperature or using solvents that cannot enter into the cavity of BP-f1 accelerated the racemization of BP-f1. The racemization kinetics and the thermodynamic parameters of racemization were studied in several different organic solvents.
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23
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Harada K, Sekiya R, Maehara T, Haino T. Substituent-controlled racemization of dissymmetric coordination capsules. Org Biomol Chem 2019; 17:4729-4735. [PMID: 30946423 DOI: 10.1039/c9ob00388f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report the effect of substituents (methyl, isopropyl, methoxy, and methoxyphenyl) at the 6'-position of the 2,2'-bipyridyl arms on the racemization of dissymmetric coordination capsules 1a-d. When the capsules included (R)-4,4'-diacetoxy-2,2'-benzyloxycarboxyl-biphenyl ((R)-3), the (M)-helical conformer was enriched with a diastereomeric excess (de%) of >98% for 1a, 31% for 1b, 81% for 1c and 75% for 1d. The entrapped guests in 1a, 1c and 1d can be removed by washing the solid containing the host-guest complexes with diethyl ether. The rate of racemization in THF follows the order of 1c > 1d ≫ 1a. X-ray crystal structural analysis and density functional theory calculation of model complex 4c indicate a distorted tetrahedral coordination of the Cu(i) center, and UV-vis absorption spectroscopy indicates similar coordination environments in 1c and 4c. A series of experiments demonstrates that the racemization rate depends on the dihedral angles of the bipyridyl arms, and the angles are regulated by the substituents. The methoxy and methoxyphenyl substituents in 1c and 1d enlarge the dihedral angles of the bipyridyl arms. This facilitates the access of solvent molecules to the Cu(i) centers and promotes racemization. The slower racemization of 1d can be ascribed to the steric protection of the Cu(i) centers from incoming solvent molecules by the p-methoxyphenyl group.
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Affiliation(s)
- Kentaro Harada
- Department of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1, Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan.
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24
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Han X, Xu YX, Yang J, Xu X, Li CP, Ma JF. Metal-Assembled, Resorcin[4]arene-Based Molecular Trimer for Efficient Removal of Toxic Dichromate Pollutants and Knoevenagel Condensation Reaction. ACS APPLIED MATERIALS & INTERFACES 2019; 11:15591-15597. [PMID: 30990300 DOI: 10.1021/acsami.9b02068] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Self-assembly of resorcin[4]arene-based coordination cages involving more than two resorcin[4]arenes poses significant challenges for the requirements of suitable functionalized resorcin[4]arene ligands and metals. Here, we report an unusual example of a metal-coordinated, resorcin[4]arene-based molecular trimer (1-NO3), composed of three resorcin[4]arenes and three Cd(II) cations. In particular, 1-NO3 features efficient and selective removal of environmentally toxic dichromate (Cr2O72-) anions. Moreover, the Knoevenagel condensation reaction was also explored by using 1-NO3 as an efficient heterogeneous catalyst.
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Affiliation(s)
- Xue Han
- Key Lab for Polyoxometalate Science, Department of Chemistry , Northeast Normal University , Changchun 130024 , China
| | - Ya-Xin Xu
- Key Lab for Polyoxometalate Science, Department of Chemistry , Northeast Normal University , Changchun 130024 , China
| | - Jin Yang
- Key Lab for Polyoxometalate Science, Department of Chemistry , Northeast Normal University , Changchun 130024 , China
| | - Xianxiu Xu
- College of Chemistry, Chemical Engineering and Materials Science, Key Laboratory of Molecular and Nano Probes, Ministry of Education , Shandong Normal University , Jinan 250014 , China
| | - Cheng-Peng Li
- College of Chemistry, Tianjin Key Laboratory of Structure and Performance for Functional Molecules, MOE Key Laboratory of Inorganic-Organic Hybrid Functional Material Chemistry , Tianjin Normal University Tianjin 300387 , China
| | - Jian-Fang Ma
- Key Lab for Polyoxometalate Science, Department of Chemistry , Northeast Normal University , Changchun 130024 , China
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25
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Guagnini F, Pedrini A, Swager TM, Massera C, Dalcanale E. Solvent-responsive cavitand lanthanum complex. Dalton Trans 2019; 48:13732-13739. [DOI: 10.1039/c9dt03199e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A new, solvent responsive tetra-phosphonate cavitand lanthanum complex forms a dimer in acetonitrile, interconverts into a monomeric complex in acetone and is disassembled in methanol.
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Affiliation(s)
- Francesca Guagnini
- Dipartimento di Scienze Chimiche
- della Vita e della Sostenibilità Ambientale and INSTM UdR Parma
- Università di Parma
- 43123 Parma (PR)
- Italy
| | - Alessandro Pedrini
- Dipartimento di Scienze Chimiche
- della Vita e della Sostenibilità Ambientale and INSTM UdR Parma
- Università di Parma
- 43123 Parma (PR)
- Italy
| | - Timothy M. Swager
- Department of Chemistry and Institute for Soldier Nanotechnologies
- Massachusetts Institute of Technology
- Cambridge
- USA
| | - Chiara Massera
- Dipartimento di Scienze Chimiche
- della Vita e della Sostenibilità Ambientale and INSTM UdR Parma
- Università di Parma
- 43123 Parma (PR)
- Italy
| | - Enrico Dalcanale
- Dipartimento di Scienze Chimiche
- della Vita e della Sostenibilità Ambientale and INSTM UdR Parma
- Università di Parma
- 43123 Parma (PR)
- Italy
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26
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Maehara T, Sekiya R, Harada K, Haino T. Tunable enforced cavities inside self-assembled capsules. Org Chem Front 2019. [DOI: 10.1039/c9qo00010k] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Controlling and tuning the molecular recognition properties is a crucial task in host–guest chemistry.
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Affiliation(s)
- Takeshi Maehara
- Department of Chemistry
- Graduate School of Science
- Hiroshima University
- Hiroshima
- 739-8526 Japan
| | - Ryo Sekiya
- Department of Chemistry
- Graduate School of Science
- Hiroshima University
- Hiroshima
- 739-8526 Japan
| | - Kentaro Harada
- Department of Chemistry
- Graduate School of Science
- Hiroshima University
- Hiroshima
- 739-8526 Japan
| | - Takeharu Haino
- Department of Chemistry
- Graduate School of Science
- Hiroshima University
- Hiroshima
- 739-8526 Japan
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27
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Nitta N, Takatsuka M, Kihara SI, Sekiya R, Haino T. Facile Synthesis of an Eight-Armed Star-Shaped Polymer via Coordination-Driven Self-Assembly of a Four-Armed Cavitand. ACS Macro Lett 2018; 7:1308-1311. [PMID: 35651252 DOI: 10.1021/acsmacrolett.8b00669] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The polystyrene chains were installed at the lower rim of a resorcinarene-based cavitand via reversible addition-fragmentation (RAFT) polymerization to form a four-armed star-shaped polymer. A star-shaped polystyrene-functionalized supramolecular capsule was prepared through the coordination-driven self-assembly of the four-armed start-shaped polymer with silver ions. The eight-armed start-shaped supramolecular capsule encapsulated 4,4'-diacetoxybiphenyl as did a cavitand-based self-assembled capsule. A DOSY measurement indicated that the eight-armed star-shaped polymer was twice as large as the four-armed star-shaped polymer. The solution behaviors of these compounds resulted in a difference in their zero-shear viscosities.
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Affiliation(s)
- Natsumi Nitta
- Department of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526 Japan
| | - Mei Takatsuka
- Department of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526 Japan
| | - Shin-ichi Kihara
- Department of Chemical Engineering, Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8527 Japan
| | - Ryo Sekiya
- Department of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526 Japan
| | - Takeharu Haino
- Department of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526 Japan
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28
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Abe H, Hashikawa D, Minami T, Ohtani K, Masuda K, Matsumoto S, Inouye M. Hexaphenolic Rigid Cages Prepared by Self-Organization of C 3 v Tridentates. J Org Chem 2018; 83:3132-3141. [PMID: 29473751 DOI: 10.1021/acs.joc.7b03111] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Coordination cages were composed by self-organization of rigid C3 v-symmetric heptaarene tridentates and Pd(II) precursors. The heptaarene framework involves one mesitylene, three phenol, and three pyridine moieties, which were connected by Suzuki coupling reactions. The treatment of the tridentates with Pd(dppp)(OTf)2 or Pd(en)(NO3)2 in a 2:3 molar ratio furnished coordination cages, which was ascertained by crystallography, 1H NMR and DOSY measurements, and ESI-TOFMS and UV-vis spectra. The cages have six phenolic hydroxy groups inside and were expected to incorporate hydrogen-bonding guest molecules such as saccharides. CD and DOSY measurements showed that octyl hexoside guests could be incorporated into the cage.
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Affiliation(s)
- Hajime Abe
- Graduate School of Pharmaceutical Sciences , University of Toyama , Toyama 930-0194 , Japan
| | - Daisuke Hashikawa
- Graduate School of Pharmaceutical Sciences , University of Toyama , Toyama 930-0194 , Japan
| | - Takaya Minami
- Graduate School of Environment and Information Sciences , Yokohama National University , Yokohama , Kanagawa 240-8501 , Japan
| | - Kohei Ohtani
- Graduate School of Pharmaceutical Sciences , University of Toyama , Toyama 930-0194 , Japan
| | - Kentaro Masuda
- Graduate School of Pharmaceutical Sciences , University of Toyama , Toyama 930-0194 , Japan
| | - Shinya Matsumoto
- Graduate School of Environment and Information Sciences , Yokohama National University , Yokohama , Kanagawa 240-8501 , Japan
| | - Masahiko Inouye
- Graduate School of Pharmaceutical Sciences , University of Toyama , Toyama 930-0194 , Japan
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29
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Wang Y, Fang H, Zhang W, Zhuang Y, Tian Z, Cao X. Interconversion of molecular face-rotating polyhedra through turning inside out. Chem Commun (Camb) 2018. [PMID: 28650011 DOI: 10.1039/c7cc04159d] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report the post-synthesis interconversion of two enantiomeric organic cages through turning inside out. By scrutinizing the thermodynamics and kinetics, we are able to control the racemization rate by various reaction conditions and reveal that the turning-inside-out interconversion is realized through a partial disassembly pathway. The kinetics investigation also provides insight into the dynamic essence of imine chemistry using different solvents and catalysts.
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Affiliation(s)
- Yu Wang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
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30
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Tsunoda Y, Takatsuka M, Sekiya R, Haino T. Supramolecular Graft Copolymerization of a Polyester by Guest-Selective Encapsulation of a Self-Assembled Capsule. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201611394] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Yuta Tsunoda
- Department of Chemistry; Graduate School of Science; Hiroshima University; 1-3-1 Kagamiyama Higashi-Hiroshima 739-8526 Japan
| | - Mei Takatsuka
- Department of Chemistry; Graduate School of Science; Hiroshima University; 1-3-1 Kagamiyama Higashi-Hiroshima 739-8526 Japan
| | - Ryo Sekiya
- Department of Chemistry; Graduate School of Science; Hiroshima University; 1-3-1 Kagamiyama Higashi-Hiroshima 739-8526 Japan
| | - Takeharu Haino
- Department of Chemistry; Graduate School of Science; Hiroshima University; 1-3-1 Kagamiyama Higashi-Hiroshima 739-8526 Japan
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31
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Tsunoda Y, Takatsuka M, Sekiya R, Haino T. Supramolecular Graft Copolymerization of a Polyester by Guest-Selective Encapsulation of a Self-Assembled Capsule. Angew Chem Int Ed Engl 2017; 56:2613-2618. [PMID: 28120481 DOI: 10.1002/anie.201611394] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Indexed: 11/07/2022]
Abstract
Repeating guest units of polyesters poly-(R)-2 were selectively encapsulated by capsule 1(BF4 )4 to produce supramolecular graft polymers. The encapsulation of the guest units was confirmed by 1 H NMR spectroscopy. The graft polymer structures were confirmed by the increase in the hydrodynamic radii and the solution viscosities of the polyesters upon complexation of the capsule. After the capsule was formed, atomic force microscopy showed extension of the polyester chains. The introduction of the graft chains onto poly-(R)-2 resulted in the main chain of the polymer having an M-helical morphology. The complexation of copolymers poly-[(R)-2-co-(S)-2] by the capsule gave rise to the unique chiral amplification known as the majority-rules effect.
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Affiliation(s)
- Yuta Tsunoda
- Department of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, 739-8526, Japan
| | - Mei Takatsuka
- Department of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, 739-8526, Japan
| | - Ryo Sekiya
- Department of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, 739-8526, Japan
| | - Takeharu Haino
- Department of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, 739-8526, Japan
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32
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Yamasaki Y, Sekiya R, Haino T. Hexameric assembly of 5,17-di-substituted calix[4]arene in the solid state. CrystEngComm 2017. [DOI: 10.1039/c7ce01515a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Chiral 5,17-difunctionalized-25,26,27,28-tetrapropyloxycalix[4]arene possessing (S)-mandelamide arms ((S,S)-1) afforded cocrystals (S,S)-1·(solvent) (solvent = MeOH, EtOH, 1-PrOH, 2-PrOH, and CH3CN). Four of the five cocrystals contain unusual hexameric assembly of the calix[4]arene host.
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Affiliation(s)
- Yutaro Yamasaki
- Department of Chemistry
- Graduate School of Science
- Hiroshima University
- Higashi-Hiroshima
- 739-8526 Japan
| | - Ryo Sekiya
- Department of Chemistry
- Graduate School of Science
- Hiroshima University
- Higashi-Hiroshima
- 739-8526 Japan
| | - Takeharu Haino
- Department of Chemistry
- Graduate School of Science
- Hiroshima University
- Higashi-Hiroshima
- 739-8526 Japan
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33
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Abstract
This review highlights relevant studies of light-controlled molecular containers able to catch and release small molecules.
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Affiliation(s)
- Alejandro Díaz-Moscoso
- Institute of Chemical Research of Catalonia (ICIQ)
- The Barcelona Institute of Science and Technology
- Tarragona
- Spain
| | - Pablo Ballester
- Institute of Chemical Research of Catalonia (ICIQ)
- The Barcelona Institute of Science and Technology
- Tarragona
- Spain
- ICREA
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34
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Shimoyama D, Yamada H, Ikeda T, Sekiya R, Haino T. Allostery in Guest Binding of Rim-to-Rim-Connected Homoditopic Biscavitands. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600410] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Daisuke Shimoyama
- Department of Chemistry; Graduate School of Science; Hiroshima University; 1-3-1 Kagamiyama 739-8526 Higashi-Hiroshima Japan
| | - Hitomi Yamada
- Department of Chemistry; Graduate School of Science; Hiroshima University; 1-3-1 Kagamiyama 739-8526 Higashi-Hiroshima Japan
| | - Toshiaki Ikeda
- Department of Chemistry; Graduate School of Science; Hiroshima University; 1-3-1 Kagamiyama 739-8526 Higashi-Hiroshima Japan
| | - Ryo Sekiya
- Department of Chemistry; Graduate School of Science; Hiroshima University; 1-3-1 Kagamiyama 739-8526 Higashi-Hiroshima Japan
| | - Takeharu Haino
- Department of Chemistry; Graduate School of Science; Hiroshima University; 1-3-1 Kagamiyama 739-8526 Higashi-Hiroshima Japan
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