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Issue 12, 2012
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Instantaneous and reversible gelation of organically grafted polyoxometalate complexes with dicarboxylic acids

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Abstract

An organically pyridyl-grafted Anderson-type POM complex (TBA–Py–MnMo6) bearing counterions of tetrabutylammonium (TBA) was found to form supramolecular gels instantaneously through mixing with appropriate dicarboxylic acid additives in acetonitrile. In the gelation process, TBA–Py–MnMo6 was confirmed to self-assemble into supramolecular polymer chains through unidirectional hydrogen bonding between the pyridyl groups of POMs and the carboxylic groups of dicarboxylic acids, which drove the complexes into one-dimensional fibers. The fibers were demonstrated to further intertwine together through the lateral hydrogen bonding between polymer chains under the support of excess acid, forming three-dimensional networks. The distance between TBA–Py–MnMo6 units secluded by dicarboxylic acid was proved to be a criterion for the formation of gels, which is related to the TBA density along the supramolecular polymer chains and the solvent–fiber interfacial energy. The gelation behaviour of the hybrid POM complex can be simply controlled through adjusting the length of dicarboxylic acids. More interestingly, the POM hybrid gels exhibited a quick response to organic bases and diacids reversibly.

Graphical abstract: Instantaneous and reversible gelation of organically grafted polyoxometalate complexes with dicarboxylic acids

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Publication details

The article was received on 09 Nov 2011, accepted on 13 Jan 2012 and first published on 08 Feb 2012


Article type: Paper
DOI: 10.1039/C2SM07142H
Citation: Soft Matter, 2012,8, 3315-3321

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    Instantaneous and reversible gelation of organically grafted polyoxometalate complexes with dicarboxylic acids

    Z. He, H. Wang, Y. Wang, Y. Wu, H. Li, L. Bi and L. Wu, Soft Matter, 2012, 8, 3315
    DOI: 10.1039/C2SM07142H

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