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| - Insight on the NMR Study of Supramolecular Gels and ItsApplication to Monitor Molecular Recognition on Self-AssembledFibers
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| - The 1H NMR study of supramolecular gels formed by two organogelators derived from valine is described.The analysis of the variation of chemical shift values and relaxation times in the gel samples reveals thatin these systems only discrete species are observed by 1H NMR. The reduced T2 values and negativeNOEs that are measured upon gel formation can be ascribed to an exchange between discrete organogelatorspecies and the gel network. This process is found to be fast in the time scale of 1H NMR relaxation andslow in the NMR observation frequency time scale. It is shown here that other molecules, aside from thegelator itself, can interact with the gel network and this process can be monitored easily by measurementof relaxation times. As a proof of principle, the selective interaction of 2,2‘-bis(hydroxymethyl)biphenylover diphenylmethane with the self-assembled fibers formed by one of the gelators in benzene is described.
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