- Ultra-Low Molecular Weight Photoswitchable Hydrogelators
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Two photoswitchable arylazopyrozoles form hydrogels at a concentration of 1.2 % (w/v). With a molecular weight of 258.28 g mol?1, these are the lowest known molecular weight hydrogelators that respond reversibly to light. Photoswitching of the E- to the Z-form by exposure to 365 nm light results in a macroscopic gel→sol transition; nearly an order of magnitude reduction in the measured elastic and loss moduli. In the case of the meta-arylazopyrozole, cryogenic transmission electron microscopy suggests that the 29±7 nm wide sheets in the E-gel state narrow to 13±2 nm upon photoswitching to the predominantly Z-solution state. Photoswitching for meta-arylazopyrozole is reversible through cycles of 365 nm and 520 nm excitation with little fatigue. The release of a rhodamine B dye encapsulated in gels formed by the arylazopyrozoles is accelerated more than 20-fold upon photoswitching with 365 nm light, demonstrating these materials are suitable for light-controlled cargo release.
- Larik, Fayaz Ali,Fillbrook, Lucy L.,Nurttila, Sandra S.,Martin, Adam D.,Kuchel, Rhiannon P.,Al Taief, Karrar,Bhadbhade, Mohan,Beves, Jonathon E.,Thordarson, Pall
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- Mixed ligand complexes of Cu(II)/Zn(II) ions containing (m-)/(p-) carboxylato phenyl azo pentane 2,4-dione and 2,2′-bipyridine/1,10 phenanthroline: Synthesis, characterization, DNA binding, nuclease and topoisomerase I inhibitory activity
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Abstract Metal complexes of type [Cu(L1H)2(bpy)] (1), [Zn(L1H)2(bpy)] (2), [Cu(L2H)2(bpy)] (3) and [Cu(L2H)2(Phen)] (4) (L1H2 = 3-[N′-(1-acetyl-2
- Hasan, Md. Amin,Kumari, Niraj,Singh, Kanhaiya,Singh, Kiran,Mishra, Lallan
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- Development of photoswitchable fluorescent molecules using arylazopyrazole
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Photoswitchable fluorescent molecules (PSFMs) are important tools for fluorescence imaging of biomolecules. To date, PSFMs have been applied for pulse-chase experiments and super-resolution imaging. However, most have limitations in that their fluorophores have low photostability or require cytotoxic additives. Here, we have developed PSFMs using a photochromic compound, arylazopyrazole, to overcome these limitations. These molecules showed reversible changes in fluorescence intensity upon photoirradiation and high photostability in aqueous solutions.
- Torii, Kenji,Hori, Yuichiro,Watabe, Keiichiro,Kikuchi, Kazuya
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supporting information
p. 821 - 824
(2020/08/28)
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- Complexes of Zn(II) containing (o-)/(p-) carboxylato phenyl azo pentane 2,4-dione and 2,2′ bipyridine as ligands: Synthesis, characterization, colorimetric and fluorometric modulation in the presence of Ag+ ions
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Azo-enol based ligands 2-[N′-(1-acetyl-2-oxo-propylidene) hydrazino]-benzoic acid (L1H2) and 4-[N′-(1 acetyl-2 oxo-propylidene)-hydrazino]-benzoic acid (L2H2) and their complexes [Zn(L1H)2(
- Amin Hasan, Md.,Kumari, Niraj,Kumar, Pankaj,Pathak, Brajesh,Mishra, Lallan
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p. 306 - 313
(2013/04/10)
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