Organogels photo-responsive

Kim and coworkers reported the application of breath figure method to a small photo-responsive molecule, i.e., a organogelator self-assembled into supramolecu-lar fibrillar networks and further ordered in a hierarchically honeycomb structure [194]. Recently, a new organogelator was synthesized and large-scale ordered honeycomb patterns were also observed [195]. Moreover, Babu et al. also reported the formation of hierarchical macroporous structures from an amino acid linked p-conjugated organogelator [196]. 

The low molecular-weight organogel has two fascinating properties. One is a physical gel property, which is attributed to the noncovalent interactions to maintain the organogel supramolecular structure. The physical organogel is responsive to external stimuli such as thermo-, photo-, chemo-, metal-, proton-, mechano-, by which the aggregate structure is stabihzed or desta-... 

Fig.26 Photo-responsive 3,3-diphenyl-3if-naphtho[2,l-b]pyran organogel...

Fig. 27 Photo-responsive L-glutamic acid-containing spiropyrane organogel...

Another photo-responsive organogel in a liquid crystalhne state was reported by Zhao s group [85]. A geiator 53 containing a photo-responsive azobenzene moiety and amide groups was dissolved in a cholesteric hquid... 

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