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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Krupová M, Leszczenko P, Sierka E, Emma Hamplová S, Pelc R, Andrushchenko V. Vibrational Circular Dichroism Unravels Supramolecular Chirality and Hydration Polymorphism of Nucleoside Crystals. Chemistry 2022; 28:e202201922. [DOI: 10.1002/chem.202201922] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Indexed: 11/07/2022]
Affiliation(s)
- Monika Krupová
- Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences Flemingovo náměstí 2 16610 Prague Czech Republic
- Hylleraas Centre for Quantum Molecular Sciences Department of Chemistry UiT The Arctic University of Norway N-9037 Tromsø Norway
| | - Patrycja Leszczenko
- Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences Flemingovo náměstí 2 16610 Prague Czech Republic
- Faculty of Chemistry Jagiellonian University Gronostajowa 2 30-387 Kraków Poland
| | - Ewa Sierka
- Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences Flemingovo náměstí 2 16610 Prague Czech Republic
- Faculty of Chemistry Jagiellonian University Gronostajowa 2 30-387 Kraków Poland
| | - Sára Emma Hamplová
- Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences Flemingovo náměstí 2 16610 Prague Czech Republic
- Department of Biology and Biochemistry University of Bath Claverton Down Bath BA2 7AY United Kingdom
| | - Radek Pelc
- Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences Flemingovo náměstí 2 16610 Prague Czech Republic
- Third Faculty of Medicine Charles University Ruská 87 10000 Prague Czech Republic
| | - Valery Andrushchenko
- Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences Flemingovo náměstí 2 16610 Prague Czech Republic
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3
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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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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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Yamagishi H, Sato H, Kawamura I. Vibrational circular dichroism of D-amino acid-containing peptide NdWFamide in the crystal form. Chirality 2021; 33:652-659. [PMID: 34313360 DOI: 10.1002/chir.23343] [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: 05/27/2021] [Revised: 07/02/2021] [Accepted: 07/08/2021] [Indexed: 01/31/2023]
Abstract
Microcrystals of l-Asn-d-Trp-l-Phe-NH2 (NdWFamide), a tripeptide derived from Aplysia kurodai that exhibits invertebrate cardiac activity, were evaluated by vibrational circular dichroism (VCD). The chirality of the tryptophan residue at the second position in NdWFamide was associated with the conformation and biological characteristics. The VCD spectrum of NdWFamide was a mirror image of its enantiomer; however, it was significantly different from that of its diastereomer, NWFamide, which is its precursor. The obtained VCD signals of NdWFamide were in good agreement with the VCD signals that were calculated based on the optimized aggregates of NdWFamide, which formed a helical-like backbone conformation. The evaluation of the VCD results revealed the conformation of NdWFamide in the crystalline state and succeeded in distinguishing its stereoisomers. Therefore, this study demonstrates VCD as a useful method for the structural analysis of naturally occurring d-amino acid-containing peptides.
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Affiliation(s)
- Hiroki Yamagishi
- Graduate School of Engineering Science, Yokohama National University, Yokohama, Japan
| | - Hisako Sato
- Graduate School of Science and Engineering, Ehime University, Matsuyama, Japan
| | - Izuru Kawamura
- Graduate School of Engineering Science, Yokohama National University, Yokohama, Japan
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6
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Kemper M, Engelage E, Merten C. Chirale molekulare Propeller basierend auf Triarylboran‐Ammoniak‐Addukten. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202014130] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Michael Kemper
- Ruhr Universität Bochum Fakultät für Chemie und Biochemie, Organische Chemie II Universitätsstraße 150 44801 Bochum Deutschland
| | - Elric Engelage
- Ruhr Universität Bochum Fakultät für Chemie und Biochemie, Organische Chemie II Universitätsstraße 150 44801 Bochum Deutschland
| | - Christian Merten
- Ruhr Universität Bochum Fakultät für Chemie und Biochemie, Organische Chemie II Universitätsstraße 150 44801 Bochum Deutschland
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7
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Kemper M, Engelage E, Merten C. Chiral Molecular Propellers of Triarylborane Ammonia Adducts. Angew Chem Int Ed Engl 2021; 60:2958-2962. [PMID: 33197119 PMCID: PMC7898383 DOI: 10.1002/anie.202014130] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Indexed: 11/19/2022]
Abstract
Chiral molecular propeller conformations have been induced to various triaryl structures including trityl derivatives and triaryl boranes. For borane-amine adducts, such induced propeller chirality has not been reported yet due to the low energy barrier for racemization in common triarylboranes such as B(C6 H5 )3 or B(C6 F5 )3 . Herein, we demonstrate that point chirality in side chains of chiral triarylborane-ammonia adducts, which feature intramolecular hydrogen bonds in addition to the dative N→B bond, can efficiently be transferred to triarylborane propeller chirality. Employing X-ray crystallography and ECD/VCD spectroscopy for structural characterizations, we investigate three examples with different steric demands of the incorporated chiral alkoxy side groups. We elucidate the conformational preferences of the molecular propellers. Furthermore, we show that computationally predicted conformational preferences obtained for the isolated, only implicitly solvated molecules are actually opposite to the experimentally observed ones.
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Affiliation(s)
- Michael Kemper
- Ruhr Universität BochumFakultät für Chemie und Biochemie, Organische Chemie IIUniversitätsstrasse 15044801BochumGermany
| | - Elric Engelage
- Ruhr Universität BochumFakultät für Chemie und Biochemie, Organische Chemie IIUniversitätsstrasse 15044801BochumGermany
| | - Christian Merten
- Ruhr Universität BochumFakultät für Chemie und Biochemie, Organische Chemie IIUniversitätsstrasse 15044801BochumGermany
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8
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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: 246] [Impact Index Per Article: 61.5] [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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9
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Sato H, Yajima T, Yamagishi A. Stereochemical effects on dynamics in two-component systems of gelators with perfluoroalkyl and alkyl chains as revealed by vibrational circular dichroism. Phys Chem Chem Phys 2018; 20:3210-3215. [DOI: 10.1039/c7cp06264h] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The VCD method was applied to the gelation processes of chiral two-component gel systems.
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Affiliation(s)
- Hisako Sato
- Graduated School of Science and Engineering
- Ehime University
- Matsuyama
- Japan
| | - Tomoko Yajima
- Faculty of Science
- Department of Chemistry
- Ochanomizu University
- Tokyo 112-8610
- Japan
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10
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Rode JE, Dobrowolski JC, Lyczko K, Wasiewicz A, Kaczorek D, Kawęcki R, Zając G, Baranska M. Chiral Thiophene Sulfonamide—A Challenge for VOA Calculations. J Phys Chem A 2017; 121:6713-6726. [DOI: 10.1021/acs.jpca.6b11015] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Joanna E. Rode
- Institute of Nuclear Chemistry and Technology, 16 Dorodna Street, 03-195 Warsaw, Poland
| | - Jan Cz. Dobrowolski
- Institute of Nuclear Chemistry and Technology, 16 Dorodna Street, 03-195 Warsaw, Poland
| | - Krzysztof Lyczko
- Institute of Nuclear Chemistry and Technology, 16 Dorodna Street, 03-195 Warsaw, Poland
| | - Aleksandra Wasiewicz
- Siedlce University, Faculty of Science, 3 Maja Street No 54, 80-110 Siedlce, Poland
| | - Dorota Kaczorek
- Siedlce University, Faculty of Science, 3 Maja Street No 54, 80-110 Siedlce, Poland
| | - Robert Kawęcki
- Siedlce University, Faculty of Science, 3 Maja Street No 54, 80-110 Siedlce, Poland
| | - Grzegorz Zając
- Faculty of Chemistry, Jagiellonian University, 3 Ingardena
Street, 30-060 Krakow, Poland
- Jagiellonian Centre for Experimental Therapeutics, Jagiellonian University, 14 Bobrzynskiego Street, 30-348 Krakow, Poland
| | - Malgorzata Baranska
- Faculty of Chemistry, Jagiellonian University, 3 Ingardena
Street, 30-060 Krakow, Poland
- Jagiellonian Centre for Experimental Therapeutics, Jagiellonian University, 14 Bobrzynskiego Street, 30-348 Krakow, Poland
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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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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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13
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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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14
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Taniguchi T, Hongen T, Monde K. Studying the stereostructures of biomolecules and their analogs by vibrational circular dichroism. Polym J 2016. [DOI: 10.1038/pj.2016.61] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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15
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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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16
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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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17
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Taniguchi T, Manai D, Shibata M, Itabashi Y, Monde K. Stereochemical analysis of glycerophospholipids by vibrational circular dichroism. J Am Chem Soc 2015; 137:12191-4. [PMID: 26379046 DOI: 10.1021/jacs.5b05832] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The stereochemistry of glycerophospholipids (GPLs) has been of interest for its roles in the evolution of life and in their biological activity. However, because of their structural complexity, no convenient method to determine their configuration has been reported. In this work, through the first systematic application of vibrational circular dichroism (VCD) spectroscopy to various diacylated GPLs, we have revealed that their chirality can be assigned by the sign of a VCD exciton couplet generated by the interaction of two carbonyl groups. This paper also presents spectroscopic evidence for the stereochemistry of GPLs isolated from bacteria, eukaryotes, and mitochondria.
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Affiliation(s)
- 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
| | - Daisuke Manai
- Faculty of Advanced Life Science, Frontier Research Center for Post-Genome Science and Technology, Hokkaido University , Kita 21 Nishi 11, Sapporo 001-0021, Japan
| | - Masataka Shibata
- Faculty of Advanced Life Science, Frontier Research Center for Post-Genome Science and Technology, Hokkaido University , Kita 21 Nishi 11, Sapporo 001-0021, Japan
| | - Yutaka Itabashi
- Graduate School of Fisheries Sciences, Hokkaido University , Hakodate 041-8611, 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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18
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Sato H, Yajima T, Yamagishi A. Chiroptical Studies on Supramolecular Chirality of Molecular Aggregates. Chirality 2015; 27:659-66. [DOI: 10.1002/chir.22482] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2015] [Revised: 06/04/2015] [Accepted: 06/08/2015] [Indexed: 12/27/2022]
Affiliation(s)
- Hisako Sato
- Graduated of Science and Engineering; Ehime University; Matsuyama Japan
| | - Tomoko Yajima
- Department of Chemistry; Ochanomizu University; Tokyo Japan
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19
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Luo Y, Chen S, Zhang H. Influence of the spacer length on the phase behaviors of mesogen-jacketed liquid crystalline polymers with a bulk side-chain. RSC Adv 2015. [DOI: 10.1039/c5ra07155k] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The alkyl spacer length influences the phase behavior and structure of mesogen-jacketed liquid-crystalline polymers with bulk side-chains.
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Affiliation(s)
- Yongbing Luo
- Key Laboratory of Polymeric Materials and Application Technology of Hunan Province
- Key Laboratory of Advanced Functional Polymer Materials of Colleges
- Universities of Hunan Province
- College of Chemistry
- Xiangtan University
| | - Sheng Chen
- Key Laboratory of Polymeric Materials and Application Technology of Hunan Province
- Key Laboratory of Advanced Functional Polymer Materials of Colleges
- Universities of Hunan Province
- College of Chemistry
- Xiangtan University
| | - Hailiang Zhang
- Key Laboratory of Polymeric Materials and Application Technology of Hunan Province
- Key Laboratory of Advanced Functional Polymer Materials of Colleges
- Universities of Hunan Province
- College of Chemistry
- Xiangtan University
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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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21
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Merten C, Berger CJ, McDonald R, Xu Y. Evidence of Dihydrogen Bonding of a Chiral Amine-Borane Complex in Solution by VCD Spectroscopy. Angew Chem Int Ed Engl 2014; 53:9940-3. [DOI: 10.1002/anie.201403690] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2014] [Revised: 05/15/2014] [Indexed: 11/10/2022]
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22
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Merten C, Berger CJ, McDonald R, Xu Y. Nachweis von Diwasserstoffbrücken in einem chiralen Amin-Boran-Komplex in Lösung mittels VCD-Spektroskopie. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201403690] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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23
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Ściebura J, Janiak A, Stasiowska A, Grajewski J, Gawrońska K, Rychlewska U, Gawroński J. Intramolecular interactions of trityl groups. Chemphyschem 2014; 15:1653-9. [PMID: 24692363 DOI: 10.1002/cphc.201301204] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2013] [Revised: 02/26/2014] [Indexed: 11/11/2022]
Abstract
Trityl group, Tr, is a molecular dynamic rotor of which the conformation and helicity depend on other groups in the close vicinity. Interactions with another covalently linked Tr group and with other substituents are analyzed in terms of transfer of chirality to the trityl group. Two trityl groups in a molecule can mutually interact at a distance of two, three, or five bonds. Despite its size, a Tr group attached to a cyclohexane or cyclopentane ring through an oxygen or nitrogen atom adopts either an axial or equatorial position, depending on additional stabilizing interactions, such as hydrogen bonding.
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Affiliation(s)
- Jacek Ściebura
- Department of Chemistry, Adam Mickiewicz University, 60-780 Poznan (Poland), Fax: (+48) 61829-1555
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Merten C, McDonald R, Xu Y. Strong Solvent-Dependent Preference of Δ and Λ Stereoisomers of a Tris(diamine)nickel(II) Complex Revealed by Vibrational Circular Dichroism Spectroscopy. Inorg Chem 2014; 53:3177-82. [DOI: 10.1021/ic4031766] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Christian Merten
- Department
of Chemistry, University of Alberta, Edmonton T6G2G2, Canada
- Fakultät für Chemie und Biochemie, Ruhr-Universität Bochum, 44801 Bochum, Germany
| | - Robert McDonald
- Department
of Chemistry, University of Alberta, Edmonton T6G2G2, Canada
| | - Yunjie Xu
- Department
of Chemistry, University of Alberta, Edmonton T6G2G2, Canada
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25
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Merten C, Reuther JF, DeSousa JD, Novak BM. Identification of the specific, shutter-like conformational reorientation in a chiroptical switching polycarbodiimide by VCD spectroscopy. Phys Chem Chem Phys 2014; 16:11456-60. [DOI: 10.1039/c4cp01226g] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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26
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Sato H, Yajima T, Yamagishi A. An intermediate state in gelation as revealed by vibrational circular dichroism spectroscopy. RSC Adv 2014. [DOI: 10.1039/c4ra02526a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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27
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Sato H, Nogami E, Yajima T, Yamagishi A. Terminal effects on gelation by low molecular weight chiral gelators. RSC Adv 2014. [DOI: 10.1039/c3ra44070b] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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28
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Schwartz E, Liégeois V, Koepf M, Bodis P, Cornelissen JJLM, Brocorens P, Beljonne D, Nolte RJM, Rowan AE, Woutersen S, Champagne B. Beta Sheets with a Twist: The Conformation of Helical Polyisocyanopeptides Determined by Using Vibrational Circular Dichroism. Chemistry 2013; 19:13168-74. [DOI: 10.1002/chem.201300073] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2013] [Revised: 05/07/2013] [Indexed: 11/10/2022]
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29
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Merten C, Xu Y. Chirality Transfer in a Methyl Lactate-Ammonia Complex Observed by Matrix-Isolation Vibrational Circular Dichroism Spectroscopy. Angew Chem Int Ed Engl 2013; 52:2073-6. [DOI: 10.1002/anie.201208685] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2012] [Indexed: 11/09/2022]
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30
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Merten C, Xu Y. Chirality Transfer in a Methyl Lactate-Ammonia Complex Observed by Matrix-Isolation Vibrational Circular Dichroism Spectroscopy. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201208685] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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31
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Sato H, Nakae T, Morimoto K, Tamura K. Critical effects of alkyl chain length on fibril structures in benzene-trans(RR)- or (SS)-N,N′-alkanoyl-1,2-diaminocyclohexane gels. Org Biomol Chem 2012; 10:1581-6. [DOI: 10.1039/c1ob06460f] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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32
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Merten C, Barron LD, Hecht L, Johannessen C. Determination of the Helical Screw Sense and Side-Group Chirality of a Synthetic Chiral Polymer from Raman Optical Activity. Angew Chem Int Ed Engl 2011; 50:9973-6. [DOI: 10.1002/anie.201104345] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2011] [Indexed: 11/11/2022]
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33
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Sato H, Yajima T, Yamagishi A. Molecular origin for helical winding of fibrils formed by perfluorinated gelators. Chem Commun (Camb) 2011; 47:3736-8. [DOI: 10.1039/c0cc05802e] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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