writer：Zhenfeng He, Huanbing Wang, Yinglin Wang, Yue Wu, Haolong Li,* Lihua Bi, Lixin Wu
keywords：Polyoxometalate, Gel, Hydrogen bond
source：期刊
specific source：Soft Matter 2012, 8, 3315-3321
Issue time：2012年

An organically pyridyl-grafted Anderson-typePOMcomplex (TBA–Py–MnMo₆) bearing counterions oftetrabutylammonium(TBA) was found to form supramolecular gels instantaneously throughmixingwith appropriatedicarboxylic acidadditives inacetonitrile. In thegelationprocess,TBA–Py–MnMo₆was confirmed to self-assemble into supramolecularpolymerchains through unidirectionalhydrogenbonding between thepyridyl groupsofPOMsand the carboxylicgroupsofdicarboxylic acids, which drove the complexes into one-dimensional fibers. The fibers were demonstrated to further intertwine together through the lateralhydrogenbonding betweenpolymerchains under the support of excess acid, forming three-dimensional networks. The distance betweenTBA–Py–MnMo₆units secluded bydicarboxylic acidwas proved to be a criterion for the formation of gels, which is related to theTBAdensity along the supramolecularpolymerchains and thesolvent–fiber interfacial energy. Thegelationbehaviour of the hybridPOMcomplex can be simply controlled through adjusting the length ofdicarboxylic acids. More interestingly, thePOMhybrid gels exhibited a quickresponse toorganic bases and diacids reversibly.

http://pubs.rsc.org/en/content/articlehtml/2012/sm/c2sm07142h