Authors
Jing Liu, Panli He, Junlin Yan, Xiaohua Fang, Junxia Peng, Kaiqiang Liu, Yu Fang
Publication date
2008/7/2
Journal
Advanced Materials
Volume
20
Issue
13
Pages
2508-2511
Publisher
WILEY‐VCH Verlag
Description
Stimulus-responsive gels have recently attracted widespread attention as new functional materials for potential applications in sensors,[1] actuators,[2] shape memories,[3] drug delivery devices,[4] and displays.[5] One of the promising properties that organogels based on low molecular mass organic gelators (LMOGs) can offer is their reversible sol–gel phase transition as a result of external stimuli.[6] As far as we know, redoxresponsive organogels from LMOGs, however, are limited. Shinkai and coworkers [7a] reported the first example of organogels of this kind, which contains a redox-active CuI/CuII center. Besides, they also synthesized a series of quater-, quinque-, and sexithiophene derivatives bearing two cholesteryl moieties at the a-position. It was found that a sol–gel phase transition can be implemented by addition of oxidizing and reducing reagents.[7b] Zhu and colleagues [7c] prepared an electro-active LMOG containing a tetrathiafulvalene (TTF) entity. The gel formation can be tuned by means of oxidation/reduction of the TTF group chemically or electrochemically. Although these gel systems are redox responsive, their properties, such as mechanical strength, ffexibility, and sensitivity to external stimulus, are far from those required for practical uses. Therefore, creating instant, reversible, redox-responsive, and mechanically ffexible organogels still remains a challenge. As a remarkable organometallic compound, ferrocene (Fc) contains an oxidizable metal ion, FeII, and is a nonpolar compound in the neutral state, and thereby it dissolves readily in hydrocarbon solvents. This property, however, can be easily reversed by simple …
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