Study On The Construction Of Organogels Based On Tetrathiafulvalene(TTF) Derivatives And Their Gel Properties

The appearance of low molecular weight organic gel factors(LMOGs)provides a unique way to create various superstructures related to the self-assembly phenomenon.LMOGs self-assemble into a gel system with an entangled three-dimensional network structure by weak intermolecular forces.In recent years,it has been extensively studied by scientists from various countries.In this paper,based on the previous research results of our group,three series of novel organic compounds containing extended(ex)tetrathiafulvalene(TTF)units were synthesized.Besides,their gelation behavior in solvents,molecular self-assembly structure,molecular arrangement and the changes of physical properties before and after gelation were studied in detail.The main research contents are as follows:1.A kind of tetrathiafulvalene LMOGs molecule modified by cyanoazobenzene group was synthesized.First,the structure of the target compound was fully characterized.Secondly,the gel behavior of this series of gel factors was emphatically studied.Finally,the results showed that this gel factor formed brownish-yellow opaque gel in 1,2-dichloroethane and n-butanol.It was confirmed by NMR and FT-IR that the hydrogen bond was the main driving force for the formation of organic gel.SEM showed that the xerogel exhibited a coarse fiber network structure.Meanwhile,that stimulation response of gel factor was studied.In addition,it was found that the gel system not only had a good adsorption effect on the organic dye rhodamine B,but also had an inclusion effect on the toxic substance 2-nitroaniline.2.A new LMOGs molecule of cyclic tetrathiafulvalene with mono-pyrrolo-thiocrown ether was synthesized.The structure of the target compound was characterized in detail and its gel behavior was studied.The results showed that the target compound could not form a gel in a single solvent.Only in the mixed solution of DMSO and water could a yellow opaque gel be formed,which formed a xerogel with a non-uniform rod-like fiber structure under SEM.It was confirmed by NMR that the driving force for gel formation was intermolecular hydrogen bonding.In addition,the gel formed by the target compound can form a binary gel with the mass fraction of 0.3wt%rhodamine B solution.3.A series of organic compounds with pyridazine-modified anthraquinone(ex-TTF)as the basic unit were synthesized.The structure of the target compound was fully characterized and its gel properties were studied.The results showed that these compounds failed to form gel in the conventional solvents which could be measured under our existing experimental conditions.We studied the self-assembly structure of the target compound in different solvents by SEM.It was found that the self-assembly morphology of the series of target compounds was also affected to a certain extent with the difference of hydrophobic chain length in aromatic solvents and aprotic solvents.In addition,the conductive properties were studied by impedance test.The results showed that the conductive abilities were different with the different lengths of hydrophobic chains.Finally,the CV method and ultraviolet titration experimental test confirmed that the target compound had the recognition effect on Na~+.