1
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Müller C, Scholten K, Engelage E, Merten C. Synthesis and VCD Spectroscopic Characterization of a Series of Azacryptands from a Chiral Valine-Based Derivative of Tris(2-aminoethyl)amine (TREN). Chemistry 2023; 29:e202302126. [PMID: 37556200 DOI: 10.1002/chem.202302126] [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: 07/04/2023] [Revised: 08/09/2023] [Accepted: 08/09/2023] [Indexed: 08/10/2023]
Abstract
Utilizing experimental and computational vibrational circular dichroism (VCD) spectroscopy, we explored the conformational preferences of a series of chiral C3 -symmetric octaazacryptands with tris(2-aminoethyl)-amine head groups derived from valine. While the spectra of the smallest azacryptand with p-phenyl linkers and its elongated derivative with p-biphenyls linker were found to match well with the computed spectra, the computed conformational preferences of the m-biphenyl-based azacryptand did not seem to reflect the conformations dominating in chloroform solution. A detailed analysis revealed that structural changes resulting in a collapsed cage structure gave a notably better match with the experiment. It could subsequently be concluded from the VCD analysis, that the octaazacryptands prefer a collapsed structure, which is not predicted by density functional theory (DFT) calculations as the global minimum structures. These findings are expected to have consequences also for future studies on inclusion complexes of such azacryptands.
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Affiliation(s)
- Clemens Müller
- Ruhr Universität Bochum, Fakultät für Chemie und Biochemie, Organische Chemie II, Universitätsstraße 150, 44801, Bochum, Germany
| | - Kevin Scholten
- Ruhr Universität Bochum, Fakultät für Chemie und Biochemie, Organische Chemie II, Universitätsstraße 150, 44801, Bochum, Germany
| | - Elric Engelage
- Ruhr Universität Bochum, Fakultät für Chemie und Biochemie, Organische Chemie II, Universitätsstraße 150, 44801, Bochum, Germany
| | - Christian Merten
- Ruhr Universität Bochum, Fakultät für Chemie und Biochemie, Organische Chemie II, Universitätsstraße 150, 44801, Bochum, Germany
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2
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Weirich L, Tusha G, Engelage E, Schäfer LV, Merten C. VCD spectroscopy reveals conformational changes of chiral crown ethers upon complexation of potassium and ammonium cations. Phys Chem Chem Phys 2022; 24:11721-11728. [PMID: 35506489 DOI: 10.1039/d2cp01309f] [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
Two chiral derivatives of 18-crown-6, namely the host molecules 2,3-diphenyl- and 2-phenyl-18c6, serve as model systems to investigate whether VCD spectroscopy can be used to monitor conformational changes occurring upon complexation of guests. Host-guest complexes of both crown ethers were prepared by addition of KNO3. The more bulky 2,3-diphenyl-18c6 is found to undergo major conformational changes upon encapsulation of K+, which are revealed as characteristic changes of the VCD spectral signatures. In contrast, while 2-phenyl-18c6 also incorporates K+ into the macrocycle, strong conformational changes are not occurring and thus spectral changes are negligible. With an octyl ammonium cation as guest molecule, 2,3-diphenyl-18c6 shows the same conformational and spectral changes that were observed for K+-complexes. In addition, the asymmetric NH3-deformation modes are found to gain VCD intensity through an induced VCD process. An analysis of the vibrational spectra enables a differentiation of VCD active and inactive guest modes: There appears to be a correlation between the symmetry of the vibrational mode and the induced VCD intensity. While this finding makes the host-guest complexes interesting systems for future theoretical studies on the origin of induced VCD signatures, the observations described in this study demonstrate that VCD spectroscopy is indeed a suitable technique for the characterization of supramolecular host-guest complexes.
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Affiliation(s)
- Luisa Weirich
- Ruhr-Universität Bochum, Fakultät für Chemie und Biochemie, Organische Chemie II, Universitätsstraße 150, 44801 Bochum, Germany.
| | - Gers Tusha
- Ruhr-Universität Bochum, Fakultät für Chemie und Biochemie, Theoretische Chemie, Universitätsstraße 150, 44801 Bochum, Germany
| | - Elric Engelage
- Ruhr-Universität Bochum, Fakultät für Chemie und Biochemie, Organische Chemie II, Universitätsstraße 150, 44801 Bochum, Germany.
| | - Lars V Schäfer
- Ruhr-Universität Bochum, Fakultät für Chemie und Biochemie, Theoretische Chemie, Universitätsstraße 150, 44801 Bochum, Germany
| | - Christian Merten
- Ruhr-Universität Bochum, Fakultät für Chemie und Biochemie, Organische Chemie II, Universitätsstraße 150, 44801 Bochum, Germany.
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3
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Engineering a cationic supramolecular charge switch for facile amino acids enantiodiscrimination based on extended-gate field effect transistors. CHINESE CHEM LETT 2021. [DOI: 10.1016/j.cclet.2021.11.081] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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4
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Weirich L, Merten C. Induced VCD and conformational chirality in host-guest complexes of a chiral ammonium salt with crown ethers. Phys Chem Chem Phys 2021; 23:18300-18307. [PMID: 34114592 DOI: 10.1039/d1cp01846a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The hydrogen bonded complexes of the chiral ammonium salt α-methylbenzyl ammonium chloride (MBA-H+Cl-) and the achiral crown ethers 18c6 and 15c5 serve as model systems to investigate the effect of host-guest complex formation on the conformational preferences of the macrocycles. We demonstrate that the intermolecular interactions result in new VCD signatures, that can be assigned to vibrational modes of the crown ethers. Based on a detailed conformational analysis, we investigate the origin of these signatures and discuss induced VCD (iVCD) and conformational chirality as possible sources of VCD intensity. The macrocycle in the MBA-H+/18c6 complex prefers either an achiral D3d-symmetric conformation, which gives rise to iVCD, or chiral conformations, that feature individual contributions to the VCD spectrum. For the MBA-H+/15c5 complex, the contributions of the macrocycle to the VCD signatures are less pronounced and found to arise solely from conformational chirality. Therefore, analysis of the VCD signatures confirms that the small chiral guest molecule is able to affect the conformational preferences of a macrocyclic host. The study thus demonstrates the suitability of VCD spectroscopy for the characterization of analogous supramolecular host-guest complexes.
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Affiliation(s)
- Luisa Weirich
- Ruhr-Universität Bochum, Fakultät für Chemie und Biochemie, Organische Chemie II, Universitätsstraße 150, 44801 Bochum, Germany.
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5
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Ishido Y, Kanbayashi N, Okamura TA, Onitsuka K. Conformational Switch of Arylopeptide: Helix-Helix Transition Based on Side Chain Solvation. Macromol Rapid Commun 2021; 42:e2100250. [PMID: 34121257 DOI: 10.1002/marc.202100250] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Revised: 05/12/2021] [Indexed: 11/11/2022]
Abstract
Controlling the structural transition between well-defined architectures found in living system is essential in polymer chemistry as well as material science. Herein, the reversible conformational switch of a non-natural polypeptide with an aromatic ring (2,6-naphthalene spacer) on its peptide backbone, referred to as an arylopeptide, between two distinct well-defined helical structures (extended 31 -helix and contracted 41 -helix) using side chain solvation is demonstrated. The folding selectivity of the arylopeptide and found that the affinity between the solvent and side chains is an essential factor for determining the global structure is investigated. A thermoresponsive arylopeptide bearing oligoether groups (─(CH2 CH2 O)9 CH3 )) on the side chain is designed, which exhibited unique lower critical solution temperature behavior and converted from the 31 to the 41 -helix depending on the temperature. Furthermore, the solvent affinity of the entire polymer by combining substituents (─(CH2 CH2 O)3 CH3 and ─C12 H25 ) with different properties on the side chains to achieve a spring-like expansion-contraction system that allows interconversion between 31 - and 41 -helices is adjusted.
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Affiliation(s)
- Yuki Ishido
- Department of Macromolecular Science Graduate School of Science, Osaka University, Toyonaka, Osaka, 560-0043, Japan
| | - Naoya Kanbayashi
- Department of Macromolecular Science Graduate School of Science, Osaka University, Toyonaka, Osaka, 560-0043, Japan
| | - Taka-Aki Okamura
- Department of Macromolecular Science Graduate School of Science, Osaka University, Toyonaka, Osaka, 560-0043, Japan
| | - Kiyotaka Onitsuka
- Department of Macromolecular Science Graduate School of Science, Osaka University, Toyonaka, Osaka, 560-0043, Japan
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6
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Abstract
This review surveys recent progress towards robust chiral nanostructure fabrication techniques using synthetic helical polymers, the unique inferred properties that these materials possess, and their intricate connection to natural, biological chirality.
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Affiliation(s)
| | - James F. Reuther
- Department of Chemistry
- University of Massachusetts Lowell
- Lowell
- USA
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7
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Albano G, Pescitelli G, Di Bari L. Chiroptical Properties in Thin Films of π-Conjugated Systems. Chem Rev 2020; 120:10145-10243. [PMID: 32892619 DOI: 10.1021/acs.chemrev.0c00195] [Citation(s) in RCA: 244] [Impact Index Per Article: 61.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Chiral π-conjugated molecules provide new materials with outstanding features for current and perspective applications, especially in the field of optoelectronic devices. In thin films, processes such as charge conduction, light absorption, and emission are governed not only by the structure of the individual molecules but also by their supramolecular structures and intermolecular interactions to a large extent. Electronic circular dichroism, ECD, and its emission counterpart, circularly polarized luminescence, CPL, provide tools for studying aggregated states and the key properties to be sought for designing innovative devices. In this review, we shall present a comprehensive coverage of chiroptical properties measured on thin films of organic π-conjugated molecules. In the first part, we shall discuss some general concepts of ECD, CPL, and other chiroptical spectroscopies, with a focus on their applications to thin film samples. In the following, we will overview the existing literature on chiral π-conjugated systems whose thin films have been characterized by ECD and/or CPL, as well other chiroptical spectroscopies. Special emphasis will be put on systems with large dissymmetry factors (gabs and glum) and on the application of ECD and CPL to derive structural information on aggregated states.
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Affiliation(s)
- Gianluigi Albano
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Giuseppe Moruzzi 13, 56124 Pisa, Italy
| | - Gennaro Pescitelli
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Giuseppe Moruzzi 13, 56124 Pisa, Italy
| | - Lorenzo Di Bari
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Giuseppe Moruzzi 13, 56124 Pisa, Italy
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8
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Merten C. Recent Advances in the Application of Vibrational Circular Dichroism Spectroscopy for the Characterization of Asymmetric Catalysts. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000876] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Christian Merten
- Fakultät für Chemie und Biochemie Organische Chemie II Ruhr Universität Bochum Universitätsstraße 150 44801 Bochum Germany
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9
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Merten C, Golub TP, Kreienborg NM. Absolute Configurations of Synthetic Molecular Scaffolds from Vibrational CD Spectroscopy. J Org Chem 2019; 84:8797-8814. [PMID: 31046276 DOI: 10.1021/acs.joc.9b00466] [Citation(s) in RCA: 72] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Vibrational circular dichroism (VCD) spectroscopy is one of the most powerful techniques for the determination of absolute configurations (AC), as it does not require any specific UV/vis chromophores, no chemical derivatization, and no growth of suitable crystals. In the past decade, it has become increasingly recognized by chemists from various fields of synthetic chemistry such as total synthesis and drug discovery as well as from developers of asymmetric catalysts. This perspective article gives an overview about the most important experimental aspects of a VCD-based AC determination and explains the theoretical analysis. The comparison of experimental and computational spectra that leads to the final conclusion about the AC of the target molecules is described. In addition, the review summarizes unique VCD studies carried out in the period 2008-2018 that focus on the determination of unknown ACs of new compounds, which were obtained in its enantiopure form either through direct asymmetric synthesis or chiral chromatography.
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Affiliation(s)
- Christian Merten
- Ruhr Universität Bochum , Organische Chemie II , Universitätsstraße 150 , 44780 Bochum , Germany
| | - Tino P Golub
- Ruhr Universität Bochum , Organische Chemie II , Universitätsstraße 150 , 44780 Bochum , Germany
| | - Nora M Kreienborg
- Ruhr Universität Bochum , Organische Chemie II , Universitätsstraße 150 , 44780 Bochum , Germany
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10
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Siriwardane DA, Kulikov O, Batchelor BL, Liu Z, Cue JM, Nielsen SO, Novak BM. UV- and Thermo-Controllable Azobenzene-Decorated Polycarbodiimide Molecular Springs. Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b00679] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Dumindika A. Siriwardane
- Department of Chemistry and Biochemistry, The University of Texas at Dallas, Richardson, Texas 75080, United States
| | - Oleg Kulikov
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, Massachusetts 02139, United States
| | - Benjamin L. Batchelor
- Department of Chemistry and Biochemistry, The University of Texas at Dallas, Richardson, Texas 75080, United States
| | - Zhiwei Liu
- Department of Chemistry and Biochemistry, University of the Sciences, 600 South 43rd Street, Philadelphia, Pennsylvania 19104, United States
| | - John Michael Cue
- Department of Chemistry and Biochemistry, The University of Texas at Dallas, Richardson, Texas 75080, United States
| | - Steven O. Nielsen
- Department of Chemistry and Biochemistry, The University of Texas at Dallas, Richardson, Texas 75080, United States
| | - Bruce M. Novak
- Department of Chemistry and Biochemistry, The University of Texas at Dallas, Richardson, Texas 75080, United States
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11
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Pollok CH, Zhang Q, Tiefenbacher K, Merten C. Chirality Induction from a Chiral Guest to the Hydrogen-Bonding Network of Its Hexameric Resorcinarene Host Capsule. Chemphyschem 2017; 18:1987-1991. [PMID: 28577348 DOI: 10.1002/cphc.201700610] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Indexed: 12/19/2022]
Abstract
The hexameric capsule of resorcin[4]arene 1 is capable of encapsulating tertiary amines, which has recently been used in the application of [(1)6 (H2 O)8 ] as (co-)catalyst in various asymmetric reactions. However, not much is known about the highly asymmetric but conformationally very dynamic structure of the capsule after uptake of chiral molecules. Therefore, in this contribution, we utilize electronic circular dichroism and vibrational circular dichroism spectroscopy to investigate how several chiral guest molecules affect the structural preferences of the capsule [(1)6 (H2 O)8 ]. In particular, we show that one small chiral amine encapsulated in [(1)6 (H2 O)8 ] is sufficient to control and dictate the stereochemical preferences of the entire capsule. Furthermore, neither strong π-π interactions nor a significant steric bulk are required for this induction. The observation of such a chiral imprint of the guest's stereochemistry onto its host molecule is expected to have implications also for other supramolecular capsules.
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Affiliation(s)
- Corina H Pollok
- Ruhr-Universität Bochum, Fakultät für Chemie und Biochemie, Organische Chemie 2, Universitätsstraße 150, 44801, Bochum, Germany
| | - Qi Zhang
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, CH-4056, Basel, Switzerland
| | - Konrad Tiefenbacher
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, CH-4056, Basel, Switzerland.,Department of Biosystems Science and Engineering, ETH Zürich, Mattenstrasse 26, CH-4058, Basel, Switzerland
| | - Christian Merten
- Ruhr-Universität Bochum, Fakultät für Chemie und Biochemie, Organische Chemie 2, Universitätsstraße 150, 44801, Bochum, Germany
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12
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Campos R, Reuther JF, Mammoottil NR, Novak BM. Solid State Sensing of Nonpolar VOCs Using the Bistable Expansion and Contraction of Helical Polycarbodiimides. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b01095] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Raymond Campos
- Department
of Chemistry and Alan G. MacDiarmid NanoTech Institute, The University of Texas at Dallas, Richardson, Texas 75080, United States
- ERC, Inc., The
Air Force Research Laboratory, Edwards AFB, California 93524-7680, United States
| | - James F. Reuther
- Department
of Chemistry and Alan G. MacDiarmid NanoTech Institute, The University of Texas at Dallas, Richardson, Texas 75080, United States
- Department
of Chemistry, University of Texas at Austin, Austin, Texas 78712, United States
| | - Nimmy R. Mammoottil
- Department
of Chemistry and Alan G. MacDiarmid NanoTech Institute, The University of Texas at Dallas, Richardson, Texas 75080, United States
| | - Bruce M. Novak
- Department
of Chemistry and Alan G. MacDiarmid NanoTech Institute, The University of Texas at Dallas, Richardson, Texas 75080, United States
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13
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Elacqua E, Croom A, Lye DS, Weck M. Coil-helix and sheet-helix block copolymers via macroinitiation from telechelic ROMP polymers. ACTA ACUST UNITED AC 2017. [DOI: 10.1002/pola.28542] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Elizabeth Elacqua
- Department of Chemistry and the Molecular Design Institute; New York University; 100 Washington Square East New York NY 10003-6688
| | - Anna Croom
- Department of Chemistry and the Molecular Design Institute; New York University; 100 Washington Square East New York NY 10003-6688
| | - Diane S. Lye
- Department of Chemistry and the Molecular Design Institute; New York University; 100 Washington Square East New York NY 10003-6688
| | - Marcus Weck
- Department of Chemistry and the Molecular Design Institute; New York University; 100 Washington Square East New York NY 10003-6688
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14
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Merten C. Vibrational optical activity as probe for intermolecular interactions. Phys Chem Chem Phys 2017; 19:18803-18812. [DOI: 10.1039/c7cp02544k] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A detailed VCD spectroscopic analysis of well-selected chiral model systems can give valuable and unprecedented insights into intermolecular interactions such as solvation or reactant–substrate binding in catalysis.
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15
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Yashima E, Ousaka N, Taura D, Shimomura K, Ikai T, Maeda K. Supramolecular Helical Systems: Helical Assemblies of Small Molecules, Foldamers, and Polymers with Chiral Amplification and Their Functions. Chem Rev 2016; 116:13752-13990. [PMID: 27754649 DOI: 10.1021/acs.chemrev.6b00354] [Citation(s) in RCA: 1198] [Impact Index Per Article: 149.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
In this review, we describe the recent advances in supramolecular helical assemblies formed from chiral and achiral small molecules, oligomers (foldamers), and helical and nonhelical polymers from the viewpoints of their formations with unique chiral phenomena, such as amplification of chirality during the dynamic helically assembled processes, properties, and specific functionalities, some of which have not been observed in or achieved by biological systems. In addition, a brief historical overview of the helical assemblies of small molecules and remarkable progress in the synthesis of single-stranded and multistranded helical foldamers and polymers, their properties, structures, and functions, mainly since 2009, will also be described.
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Affiliation(s)
- Eiji Yashima
- Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University , Chikusa-ku, Nagoya 464-8603, Japan
| | - Naoki Ousaka
- Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University , Chikusa-ku, Nagoya 464-8603, Japan
| | - Daisuke Taura
- Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University , Chikusa-ku, Nagoya 464-8603, Japan
| | - Kouhei Shimomura
- Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University , Chikusa-ku, Nagoya 464-8603, Japan
| | - Tomoyuki Ikai
- Graduate School of Natural Science and Technology, Kanazawa University , Kakuma-machi, Kanazawa 920-1192, Japan
| | - Katsuhiro Maeda
- Graduate School of Natural Science and Technology, Kanazawa University , Kakuma-machi, Kanazawa 920-1192, Japan
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16
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Bünnemann K, Merten C. Solvation of N,C-Protected Valine: Interactions with DMSO and a Chiral Solvating Agent. J Phys Chem B 2016; 120:9434-42. [DOI: 10.1021/acs.jpcb.6b05897] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Christian Merten
- Organische
Chemie 2, Ruhr Universität Bochum, 44801 Bochum, Germany
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17
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Osowski T, Golbek J, Merz K, Merten C. Intermolecular Interactions of a Chiral Amine Borane Adduct Revealed by VCD Spectroscopy. J Phys Chem A 2016; 120:4108-15. [DOI: 10.1021/acs.jpca.6b03955] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tobias Osowski
- Organische
Chemie 2, Ruhr-Universität Bochum, 44801 Bochum, Germany
| | - Julia Golbek
- Anorganische
Chemie 1, Ruhr-Universität Bochum, 44801 Bochum, Germany
| | - Klaus Merz
- Anorganische
Chemie 1, Ruhr-Universität Bochum, 44801 Bochum, Germany
| | - Christian Merten
- Organische
Chemie 2, Ruhr-Universität Bochum, 44801 Bochum, Germany
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18
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Li J, Du M, Zhao Z, Liu H. Cyclopolymerization of Disiloxane-Tethered Divinyl Monomers To Synthesize Chirality-Responsive Helical Polymers. Macromolecules 2016. [DOI: 10.1021/acs.macromol.5b02142] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Junjiang Li
- Key Laboratory of Soft Matter Chemistry, Chinese Academy
of Sciences, Department of Polymer Science and Engineering, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui Province 230026, P. R. China
| | - Min Du
- Key Laboratory of Soft Matter Chemistry, Chinese Academy
of Sciences, Department of Polymer Science and Engineering, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui Province 230026, P. R. China
| | - Zhongqiang Zhao
- Key Laboratory of Soft Matter Chemistry, Chinese Academy
of Sciences, Department of Polymer Science and Engineering, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui Province 230026, P. R. China
| | - Hewen Liu
- Key Laboratory of Soft Matter Chemistry, Chinese Academy
of Sciences, Department of Polymer Science and Engineering, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui Province 230026, P. R. China
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19
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Yan S, Zou H, Kang W, Sun L. DFT investigation on dihydrogen-bonded amine-borane complexes. J Mol Model 2015; 22:17. [DOI: 10.1007/s00894-015-2886-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Accepted: 12/10/2015] [Indexed: 11/28/2022]
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20
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Merten C, Smyrniotopoulos V, Tasdemir D. Assignment of absolute configurations of highly flexible linear diterpenes from the brown alga Bifurcaria bifurcata by VCD spectroscopy. Chem Commun (Camb) 2015; 51:16217-20. [PMID: 26399505 DOI: 10.1039/c5cc05659d] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Correct assignment of the stereogenic centers of highly flexible linear diterpenes (LDs) is challenging. Herein we report the first application of VCD spectroscopy for the absolute configuration determination of LDs of algal origin and provide experimental and computational procedures, such as a fragmentation approach, which will facilitate the use of VCD spectroscopy for configuration assignments of LDs.
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Affiliation(s)
- Christian Merten
- Ruhr-Universität Bochum, Organische Chemie 2, Universitätsstraße 150, 44801 Bochum, Germany.
| | | | - Deniz Tasdemir
- School of Chemistry, National University of Ireland Galway, University Road, Galway, Ireland and Marine Natural Products Chemistry, GEOMAR Helmholtz Centre for Ocean Research, Am Kiel-Kanal 44, 24106 Kiel, Germany
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21
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Yamagishi H, Fukino T, Hashizume D, Mori T, Inoue Y, Hikima T, Takata M, Aida T. Metal–Organic Nanotube with Helical and Propeller-Chiral Motifs Composed of a C10-Symmetric Double-Decker Nanoring. J Am Chem Soc 2015; 137:7628-31. [DOI: 10.1021/jacs.5b04386] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hiroshi Yamagishi
- Department
of Chemistry and Biotechnology, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Takahiro Fukino
- Department
of Chemistry and Biotechnology, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Daisuke Hashizume
- RIKEN Center for Emergent Matter Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Tadashi Mori
- Department
of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1
Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Yoshihisa Inoue
- Department
of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1
Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Takaaki Hikima
- RIKEN SPring-8 Center, 1-1-1
Kouto, Sayo, Hyogo 679-5198, Japan
| | - Masaki Takata
- RIKEN SPring-8 Center, 1-1-1
Kouto, Sayo, Hyogo 679-5198, Japan
| | - Takuzo Aida
- Department
of Chemistry and Biotechnology, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
- RIKEN Center for Emergent Matter Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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22
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Kulikov OV, Siriwardane DA, Reuther JF, McCandless GT, Sun HJ, Li Y, Mahmood SF, Sheiko SS, Percec V, Novak BM. Characterization of Fibrous Aggregated Morphologies and Other Complex Architectures Self-Assembled from Helical Alkyne and Triazole Polycarbodiimides (R)- and (S)-Families in the Bulk and Thin Film. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b00407] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Oleg V. Kulikov
- Department
of Chemistry, University of Texas at Dallas, Richardson, Texas 75080, United States
| | | | - James F. Reuther
- Department
of Chemistry, University of Texas at Austin, Austin, Texas 78712, United States
| | - Gregory T. McCandless
- Department
of Chemistry, University of Texas at Dallas, Richardson, Texas 75080, United States
| | - Hao-Jan Sun
- Department
of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Yuanchao Li
- Department
of Chemistry, The University at North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Samsuddin F. Mahmood
- Department
of Chemistry, University of Texas at Dallas, Richardson, Texas 75080, United States
| | - Sergei S. Sheiko
- Department
of Chemistry, The University at North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Virgil Percec
- Department
of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Bruce M. Novak
- Department
of Chemistry, University of Texas at Dallas, Richardson, Texas 75080, United States
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23
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Reuther JF, Siriwardane DA, Kulikov OV, Batchelor BL, Campos R, Novak BM. Facile Synthesis of Rod–Coil Block Copolymers with Chiral, Helical Polycarbodiimide Segments via Postpolymerization CuAAC “Click” Coupling of Functional End Groups. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b00453] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- James F. Reuther
- Department
of Chemistry and Alan G. MacDiarmid NanoTech Institute, University of Texas at Dallas, Richardson, Texas 75080, United States
- Department
of Chemistry, University of Texas at Austin, Austin, Texas 78712, United States
| | - Dumindika A. Siriwardane
- Department
of Chemistry and Alan G. MacDiarmid NanoTech Institute, University of Texas at Dallas, Richardson, Texas 75080, United States
| | - Oleg V. Kulikov
- Department
of Chemistry and Alan G. MacDiarmid NanoTech Institute, University of Texas at Dallas, Richardson, Texas 75080, United States
| | - Benjamin L. Batchelor
- Department
of Chemistry and Alan G. MacDiarmid NanoTech Institute, University of Texas at Dallas, Richardson, Texas 75080, United States
| | - Raymond Campos
- Department
of Chemistry and Alan G. MacDiarmid NanoTech Institute, University of Texas at Dallas, Richardson, Texas 75080, United States
| | - Bruce M. Novak
- Department
of Chemistry and Alan G. MacDiarmid NanoTech Institute, University of Texas at Dallas, Richardson, Texas 75080, United States
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24
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Hongen T, Taniguchi T, Nomura S, Kadokawa JI, Monde K. In Depth Study on Solution-State Structure of Poly(lactic acid) by Vibrational Circular Dichroism. Macromolecules 2014. [DOI: 10.1021/ma501020s] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Takahiro Hongen
- Faculty
of Advanced Life Science, Frontier Research Center for Post-Genome
Science and Technology, Hokkaido University, Kita 21 Nishi 11, Sapporo 001-0021, Japan
| | - Tohru Taniguchi
- Faculty
of Advanced Life Science, Frontier Research Center for Post-Genome
Science and Technology, Hokkaido University, Kita 21 Nishi 11, Sapporo 001-0021, Japan
| | - Shintaro Nomura
- Department
of Chemistry, Biotechnology, and Chemical Engineering, Graduate School
of Science and Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima 890-0065, Japan
| | - Jun-ichi Kadokawa
- Department
of Chemistry, Biotechnology, and Chemical Engineering, Graduate School
of Science and Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima 890-0065, Japan
| | - Kenji Monde
- Faculty
of Advanced Life Science, Frontier Research Center for Post-Genome
Science and Technology, Hokkaido University, Kita 21 Nishi 11, Sapporo 001-0021, Japan
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25
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Reuther JF, Bhatt MP, Tian G, Batchelor BL, Campos R, Novak BM. Controlled Living Polymerization of Carbodiimides Using Versatile, Air-Stable Nickel(II) Initiators: Facile Incorporation of Helical, Rod-like Materials. Macromolecules 2014. [DOI: 10.1021/ma5009429] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- James F. Reuther
- Department of Chemistry and Alan G. MacDiarmid NanoTech
Institute, University of Texas Dallas, Richardson, Texas 75080, United States
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695, United States
| | - Mahesh P. Bhatt
- Department of Chemistry and Alan G. MacDiarmid NanoTech
Institute, University of Texas Dallas, Richardson, Texas 75080, United States
| | - Gonglu Tian
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695, United States
| | - Benjamin L. Batchelor
- Department of Chemistry and Alan G. MacDiarmid NanoTech
Institute, University of Texas Dallas, Richardson, Texas 75080, United States
| | - Raymond Campos
- Department of Chemistry and Alan G. MacDiarmid NanoTech
Institute, University of Texas Dallas, Richardson, Texas 75080, United States
| | - Bruce M. Novak
- Department of Chemistry and Alan G. MacDiarmid NanoTech
Institute, University of Texas Dallas, Richardson, Texas 75080, United States
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