Gel Synthesis And Properties Of Functionalized Small Organic Molecules

The self-assembling of small functional molecules into supramolecular structures is a powerful approach toward the development of new materials and nanoscale devices. As a novel class of self-assembled materials, organogels have received considerable attention in recent years because they can organize into regular nanoarchitectures through specific noncovalent interactions including hydrogen bonds, hydrophobic interactions,π-πinteractions and van der Waals forces. In this thesis, two functional organogels were designed and synthesized. Their functionalities, morphology and the packing fashion in the gel state were studied in details. The whole paper contains two parts as following:1. Tunable red-green-blue fluorescent organogels on the basis of intermolecular energy-transfer1) Three basic fluorescent organogels are designed and synthesized by modifyingthe classic fluoresence group. Six tunable fluorescent organogels are obtained by adulterant different proportion of the basic gels.2) XRD and SEM studies show two components in the adulterant gels have strong interaction with each other.3) To adulterant gels, theoretical calculation shows that intermolecular energy transfer plays a crucial role in term of tunable process both in solution and in gel state by testing the lifetime of the fluoresence group. It is much instructive in the future to design a new type of colorful monitor because of the classic chemical structure.2. Zn²⁺ cation trigger cyclen self-assembly into a stable metallogel and tunable wettability in self-assembly system1) We have designed and synthesized a cyclen (1,4,7,10-tetrazacyclododecane) derivative as an accept group, which contains 1,3,5-triazine and two azobenzene moieties with hydrophobic alkyl chains. This compound has the ability for gelating DMSO in the prescence of Zn²⁺ cation.2) The morphology of the xerogels strongly depends on equivalent of Zn²⁺ cation, which turns from sphere structure to 2-D fiber structure with the cation adding. 3) The wettability of the xerogel surface strongly controlled by the equivalent of Zn²⁺ cation. This is the good example that the wettability property of the low molecular assembly surface can be tuned with the cation adding.