Photo-induced colour generation and colour erasing switched by the sol–gel phase transition

Yi, Tao; Sada, Kazuki; Sugiyasu, Kazunori; Hatano, Tsukasa; Shinkai, Seiji

doi:10.1039/b210741d

Cited by 32 publications

(19 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…14 When an appropriate mixture of the gelator and the molybdate complex were irradiated with UVlight, a blue color developed both in the sol and gel states. When the rate of fading of the color upon keeping the sample in dark was studied, the color fading in gel was found to be 26 times slower than in sol.…”

Section: Thermochromism By the Incorporation Of An Additive In The Gelmentioning

confidence: 99%

Supramolecular gels: Functions and uses

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

Section: Thermochromism By the Incorporation Of An Additive In The Gelmentioning

confidence: 99%

Supramolecular gels: Functions and uses

2005

View full text Add to dashboard Cite

show abstract

“…Chromogenic compounds bromophenol blue and polyoxomolybdate complexes were described to experiment color change associated with the formation of, respectively, molecular hydrogels 41 and organogels. 42 Here we report on how molecular gel formation by compound 1 (Scheme 1) in dichloromethane activates RB reversibly as a photosensitizer. The thermal regulation of 1 O2 photogeneration has only been reported for a copolymer of RB and N-isopropylacrylamide 43 , but there is no precedent, up to our knowledge, of thermal control of photosensitizing activity by a molecular gel assembly/disassembly process.…”

Section: Introductionmentioning

confidence: 96%

Adsorption of Rose Bengal on a self-assembled fibrillar network affords a thermally switchable oxygenation photocatalyst and a thermochromic soft material

Valle

Felip-León

Galindo

et al. 2020

Journal of Photochemistry and Photobiology A: Chemistry

View full text Add to dashboard Cite

Rose Bengal (RB) can be homogeneously dispersed in dichloromethane by its adsorption on the fibrillar network of a molecular gel formed in this solvent. The RB loaded gel was visualized by confocal scanning laser microscopy, revealing homogenous distribution all over the selfassembled fibers. Thermal gel disassembly provokes discoloration of the system because of protonation of RB by the acidic molecular gelator. Thermochromism was evaluated by UV-Vis spectroscopy, showing that color change is fully reversible and associated with gel assembly/disassembly, as corroborated by 1 H NMR determination of the amount of free gelator.Singlet oxygen photogeneration from the RB-loaded gel was assayed using 9,10dimethylanthracene as a 1 O2 trap. It was found that the photosensitizing activity of the system is on /off thermally switched, controlled by reversibly gel formation, resulting in a smart thermoresponsive photocatalytic material.

show abstract

“…Covalently modified polyoxometalates were reported to form supramolecular gels through hydrogen bonding [31,32]. A controllable photochromic gel was fabricated by mixing alkylammonium-polyoxomolybdate composites with efficient gelators [33]. Surfactant-encapsulated polyoxometalates have been confirmed to readily gel.…”

Section: Self-assembly Of Modified Polyoxometalate Complexesmentioning

confidence: 98%

Assembly of Polyoxometalate-Based Composite Materials

Fan

Hao

Wei

2012

J Inorg Organomet Polym

View full text Add to dashboard Cite

This paper is a review the polyoxometalatebased composite materials, including polyoxometalate incorporated Langmuir and Langmuir-Blodgett, layerby-layer multilayers and novel honeycomb films, selfassembly structures of modified polyoxometalate complexes (e.g., onion-like structures, new inorganic-organic-inorganic vesicles, thermotropic and lyotropic liquid crystalline structures, gels), and amino acid-and protein-polyoxometalate nanorods and nanoparticles. Polyoxometalate-embedded layer-by-layer multilayer films show electrocatalytic or photochemical activity; and, novel photoluminescent honeycomb films templated by microwater droplets are reviewed. Inorganic-organic-inorganic hybrid vesicles display the potential as nano-switches. In addition, amino acid-and proteinpolyoxometalate composite nanostructures indicate potential antimicrobial applications. Therefore, the polyoxometalatebased composite materials have promising applications in electrochemistry, photochemistry and biomedicine.

show abstract

Photo-induced colour generation and colour erasing switched by the sol–gel phase transition

Abstract: The controlled colour generation and colour erasing phenomena of alkylammonium polyoxomolybdate complexes were first observed in the trans-(1R,2R)-1,2-bis(undecylcarbonylamino)cyclohexane organogel system using the sol-gel phase transition.

Cited by 32 publications

References 14 publications

Supramolecular gels: Functions and uses

Supramolecular gels: Functions and uses

Adsorption of Rose Bengal on a self-assembled fibrillar network affords a thermally switchable oxygenation photocatalyst and a thermochromic soft material

Assembly of Polyoxometalate-Based Composite Materials

Contact Info

Product

Resources

About