Multiaddressable Self-Assembling Organogelators Based on 2<i>H</i>-Chromene and <i>N</i>-Acyl-1,ω-amino Acid Units

Ahmed, Saleh A.; Sallenave, Xavier; Fagès, Frédéric; Mieden-Gundert, Gudrun; Müller, Walter M.; Müller, Ute; Vögtle, Fritz; Pozzo, Jean‐Luc

doi:10.1021/la025545g

“…8 The sodium salts of S4 and S5 formed gels in DMF and DMSO over a wide range of concentration. The neutral carboxylic acid forms were readily soluble in DMF and DMSO at ambient temperatures and formed gels when NaOH was added.…”

Section: Gelators With Receptor Sites or Photoisomerizable Groupsmentioning

confidence: 99%

Supramolecular gels: Functions and uses

Sangeetha

¹

,

Maitra

²

2005

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In recent years there has been immense interest in studying gels derived from low molecular mass gelators (supramolecular, or simply molecular gels). The motivation for this is not only to understand the fundamental aggregate structures in the gels at different length scales, but also to explore their potential for futuristic technological applications. Gels have been made sensitive to external stimuli like light and chemical entities by incorporating a spectroscopically active or a receptor unit as part of the gelator molecule. This makes them suitable for applications such as sensing and actuating. The diversity of gel structural architectures has allowed them to be utilized as templates to prepare novel inorganic superstructures for possible applications in catalysis and separation. Gels derived from liquid crystals (anisotropy gels) that can act as dynamically functional materials have been prepared, for example, for (re-writable) information recording. Supramolecular gels can be important in controlled release applications, in oil recovery, for gelling cryogenic fuels etc. They can also serve as media for a range of applications. This tutorial review highlights some of the instructive work done by various groups to develop smart and functional gels, and covers a wide spectrum of scientific interest ranging from medicine to materials science.

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“…330 The products contain fewer sp 3 sites than the reactants so tend to adopt a more planar conformation, allowing for increased conjugation and the emergence of new optical absorption bands in the range 570-750 nm. A sol-gel transition may occur due to the possibility of increased π-π stacking, 332,333 and other effects requiring close interactions between conjugated systems, such as Förster transfer 334 or the formation of donor-acceptor complexes, 332 may also be observed. The sensitivity of supramolecular assemblies to such changes in packing was illustrated by Qiu et al in a study of a spiropyran linked to a di-D-alanine moiety.…”

Section: Electrocyclic Reactionsmentioning

confidence: 99%

Gels with sense: supramolecular materials that respond to heat, light and sound

Jones

¹

,

Steed

²

2016

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. (2016) 'Gels with sense : supramolecular materials that respond to heat, light and sound.', Chemical society reviews., 45 (23). pp. 6546-6596. Further information on publisher's website:https://doi.org/10.1039/C6CS00435KPublisher's copyright statement:Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Advances in the field of supramolecular chemistry have made it possible, in many situations, to reliably engineer soft materials to address a specific technological problem. Particularly exciting are "smart" gels that undergo reversible physical changes on exposure to remote, non-invasive environmental stimuli. This review explores the development of gels which are transformed by heat, light and ultrasound, as well as other mechanical inputs, applied voltages and magnetic fields. Focusing on small-molecule gelators, but with reference to organic polymers and metal-organic systems, we examine how the structures of gelator assemblies influence the physical and chemical mechanisms leading to thermo-, photo-and mechano-switchable behaviour. In addition, we evaluate how the unique and versatile properties of smart materials may be exploited in a wide range of applications, including catalysis, crystal growth, ion sensing, drug delivery, data storage and biomaterial replacement.

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“…Organogels of 2H-chromene derivatives of sodium N-acyl-11-amino undecanoate (S4 and S5; Chart 3) were shown to be both light and pH sensitive. 8 The sodium salts of S4 and S5…”

Section: Gelators With Receptor Sites or Photoisomerizable Groupsmentioning

confidence: 99%

Supramolecular Gels: Functions and Uses

Sangeetha

¹

,

Maitra

²

2005

View full text Add to dashboard Cite

In recent years there has been immense interest in studying gels derived from low molecular mass gelators (supramolecular, or simply molecular gels). The motivation for this is not only to understand the fundamental aggregate structures in the gels at different length scales, but also to explore their potential for futuristic technological applications. Gels have been made sensitive to external stimuli like light and chemical entities by incorporating a spectroscopically active or a receptor unit as part of the gelator molecule. This makes them suitable for applications such as sensing and actuating. The diversity of gel structural architectures has allowed them to be utilized as templates to prepare novel inorganic superstructures for possible applications in catalysis and separation. Gels derived from liquid crystals (anisotropy gels) that can act as dynamically functional materials have been prepared, for example, for (re-writable) information recording. Supramolecular gels can be important in controlled release applications, in oil recovery, for gelling cryogenic fuels etc. They can also serve as media for a range of applications. This tutorial review highlights some of the instructive work done by various groups to develop smart and functional gels, and covers a wide spectrum of scientific interest ranging from medicine to materials science.

show abstract

Multiaddressable Self-Assembling Organogelators Based on 2H-Chromene and N-Acyl-1,ω-amino Acid Units

Cited by 141 publications

References 36 publications

Supramolecular gels: Functions and uses

Supramolecular gels: Functions and uses

Gels with sense: supramolecular materials that respond to heat, light and sound

Supramolecular Gels: Functions and Uses

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