Journal Article10.1002/CHEM.201405406
Multiple-stimulus-responsive supramolecular gels of two components and dual chiroptical switches.
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TL;DR: The studies of CD spectra suggested that the supramolecular chirality induced by self-assembled chiral gelator molecules in gels could be tuned by the length of methylene spacer, which would facilitate the development of dual chiroptical switches by temperature and acid/base.
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Abstract: A new class of L-glutamic gelators, LG12(CH2)nCOOH, containing different lengths of methylene spacer were synthesized. It was found that the gelation ability of these compounds themselves was very weak. However, when another compound, p-xylylenediamine (XEA), was introduced, the gelation ability was improved greatly. In particular, LG12(CH2)10COOH showed super-gelation ability in the presence of XEA, which could immobilize almost all of the solvents except methanol. Moreover, the formed supramolecular gels even could be molded. Interestingly, some supramolecular gels of LG12(CH2)nCOOH and XEA could respond to multiple stimuli, such as heating, shaking, sonication, and acid/base. The studies of CD spectra suggested that the supramolecular chirality induced by self-assembled chiral gelator molecules in gels could be tuned by the length of methylene spacer. In addition, the supramolecular chirality could be regulated as on/off by heating–cooling or external NH3/HCl. This would facilitate the development of dual chiroptical switches by temperature and acid/base.
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Field responsive materials: photo-, electro-, magnetic- and ultrasound-sensitive polymers
TL;DR: In this paper, the authors highlight recent progress in the emerging field of photo-, electro-, magnetic-and ultrasound-sensitive polymers and present novel synthetic routes to these polymers as well as their responsive properties and functions.
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Multi-Stimuli-Responsive Polymer Materials: Particles, Films, and Bulk Gels.
Ziquan Cao,Guojie Wang +1 more
TL;DR: The polymer design, preparation, and function of multi-stimuli-responsive particles, films, and bulk gels are comprehensively discussed here.
180
Combined reversible switching of ECD and quenching of CPL with chiral fluorescent macrocycles.
Alexandre Homberg,Elodie Brun,Francesco Zinna,Simon Pascal,Marcin Górecki,Luc Monnier,Céline Besnard,Gennaro Pescitelli,Lorenzo Di Bari,Jérôme Lacour +9 more
TL;DR: A series of chiral fluorescent macrocycles display a remarkable combination of both +/– ECD and strong on/off CPL reversible switching upon cation binding and displacement.
Alanine-Based Chiral Metallogels via Supramolecular Coordination Complex Platforms: Metallogelation Induced Chirality Transfer
Yue Sun,Yue Sun,Shuai Li,Zhixuan Zhou,Manik Lal Saha,Sougata Datta,Mingming Zhang,Xuzhou Yan,Demei Tian,Demei Tian,Heng Wang,Lei Wang,Xiaopeng Li,Minghua Liu,Haibing Li,Peter J. Stang +15 more
TL;DR: This technique is reported on on the efficient preparation of alanine-based chiral metallacycles, rhomboids 1D and 1L and hexagons 2D and 2L using a Pt(II) ← pyridyl directional bonding approach to allow the design of versatile soft materials containing chiral supramolecular cores.
Helicity Inversion of Supramolecular Hydrogels Induced by Achiral Substituents
Guofeng Liu,Xin Li,Jianhui Sheng,Jianhui Sheng,Pei-Zhou Li,Wee Kong Ong,Soo Zeng Fiona Phua,Hans Ågren,Liangliang Zhu,Yanli Zhao +9 more
TL;DR: In this paper, achiral residues covalently bonded to chiral amino acids can function in the chirality inversion of supramolecular assemblies, which is mainly induced by distinct stacking mode of the self-assembled building blocks, as collectively confirmed by scanning electron microscopy, circular dichroism, crystallography and molecular dynamics calculations.
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TL;DR: The hydrolysis of the carboxylic ester bond serves as the only path to obtain a novel anisotropic supramolecular hydrogel that is stable over a wide pH range and illustrates the design principles for creating pH-stable supramolescular soft materials.
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Photoreversible dendritic organogel
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Novel dimeric cholesteryl derivatives and their smart thixotropic gels.
TL;DR: Three novel LS(2)-type dimeric-cholesteryl derivatives (1-3), where S is a steroidal residue and L stands for a linker connecting the two S residues and contains three benzene rings and two amide and two carbamate groups, were designed and prepared.
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Reversible Gelation of Rod-Like Viruses Grafted with Thermoresponsive Polymers
TL;DR: The synthesis and selected macroscopic properties of a new model system consisting of poly(N-isopropylacrylamide) (PNIPAM)-coated rod-like fd virus particles are presented to study effect of particle shape on gelation transition, the structure and viscoelasticity of isotropic and nematic gels.
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