2020
DOI: 10.1021/jacs.0c02201
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Light-Driven Expansion of Spiropyran Hydrogels

Abstract: The incorporation of molecular switches in organic structures is of great interest in the chemical design of stimuli-responsive materials that mimic the complex functions of living systems. Merocyanine dyes that convert to spiropyran moieties upon exposure to visible light have been extensively studied as they can be incorporated in hydrated covalent networks that will expel water when this conversion occurs and induce a volumetric shrinkage. We report here on a sulfonate-based water-soluble photoswitch that, … Show more

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Cited by 239 publications
(189 citation statements)
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“…The most promising approach to date has relied on spiropyran derivatives, where photoreversible ring-opening and -closing reactions drive large changes in hydrophilicity and thus swelling. 29 32 However, realization of robust photochemical responses has been complicated by narrow pH operational ranges and photoswitching fatigue in these systems.…”
mentioning
confidence: 99%
“…The most promising approach to date has relied on spiropyran derivatives, where photoreversible ring-opening and -closing reactions drive large changes in hydrophilicity and thus swelling. 29 32 However, realization of robust photochemical responses has been complicated by narrow pH operational ranges and photoswitching fatigue in these systems.…”
mentioning
confidence: 99%
“…Photo-induced self-assemblies of peptide fibers [ 3 ] and the manipulation of cell behaviors [ 4 ] have been reported using peptides protected with a photo-cleavable nitrobenzyl group. More recently, a photo-activated mechanical actuation was realized by peptide fibers conjugated with spiropyran units in which ring-open and ring-close can be switched by a light [ 5 , 6 ]. As described later, a variety of manipulations for controlling cell behaviors are possible by introducing bioactive peptides into hydrophilic parts exposed to solutions, which have led to attractive applications to cell culture scaffolds and drug delivery systems.…”
Section: Peptide-based Self-assembliesmentioning
confidence: 99%
“…Among them, peptide-based fibrous supramolecular assemblies are one of the most attractive platforms to design biomaterials with various bioactivities and structures, and they have recently attracted particular attention. In pioneer works, amphiphilic peptides having hydrophobic alkyl chain at the termini of hydrophilic peptides have been designed, and their fundamental properties and applications to biomaterials have been investigated [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 ]. Currently, both amphiphilic peptides and other peptide-based self-assembly units have been found, enabling the design of peptide fibers with a variety of functions [ 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 ,…”
Section: Introductionmentioning
confidence: 99%
“…[12][13][14] Oen, the responsivity is programmed into the so material at the (macro)molecular level prior to formation of a liquid crystal elastomer or gel network for example. Some common external stimuli that have been investigated previously include changes in pH [15][16][17] or temperature, [18][19][20] reduction and oxidation, [21][22][23][24] magnetic elds, 25 or irradiation with light (e.g., UV, visible, near-IR (NIR)), [26][27][28][29][30][31][32][33][34][35][36][37] where the selection of a material's responsive components is typically based on the desired application and preference for a specic external stimulus.…”
Section: Introductionmentioning
confidence: 99%