Akazawa, Masako published the artcilePhotoresponsive dithienylethene-urea-based organogels with “reversed” behavior, HPLC of Formula: 219537-97-0, the publication is Organic & Biomolecular Chemistry (2008), 6(9), 1544-1547, database is CAplus and MEDLINE.
Dithienylperhydrocyclopentene-bisurea-based low mol. weight gelators are described that function as photoresponsive organogels that show a remarkable gel-to-liquid transition upon irradiation The two series of derivatives, with and without alkyl spacers between the urea hydrogen bonding groups and the photochromic unit, show different gelation behavior. Upon UV irradiation of the gels, a gel liquefied at only 1.4% conversion of the photochromic unit. Transmission electron microscopy (TEM) shows that the gel fibers consist of thin ribbons. Semi-empirical (PM3) calculations indicate that the hydrogen bonding between the open-ring isomer (o) mols. is weak, and that formation of the closed-ring isomer (c) destabilizes the hydrogen bonding further. The results indicate that a small amount of the closed-ring isomer will disrupt the intermol. hydrogen-bonding, leading to disintegration of the gel fiber ribbons and hence reversible liquefication.
Organic & Biomolecular Chemistry published new progress about 219537-97-0. 219537-97-0 belongs to chlorides-buliding-blocks, auxiliary class Fused/Partially Saturated Cycles,Cyclopentenes, name is 5-Chloro-3-[2-(5-chloro-2-methylthien-3-yl)cyclopent-1-en-1-yl]-2-methylthiophene, and the molecular formula is C15H14Cl2S2, HPLC of Formula: 219537-97-0.
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