| Ion self-assembly is a combination method through the combination of anions and cations by electrostatic attraction to form compounds.Because of its simplicity and ease of operation,the development of new ionic materials in this way is very common in scientific research.Because the imidazolium cations are functional and structurally configurable,they are highly favored by scientists who are dedicated to the development of new functional materials.In this context,we explore the novel materials with special properties synthesized by self-assembly of imidazolium cations and sulfonate anions.Some rules regarding to the self-assembly of these ionic materials have been discovered and these ionic materials have been applied to some practical fields.The specific work is briefly described as follows:(1)Study on the assembly rules of imidazolium cations and sulfonate anions.Firstly,we considered assembling imidazolium cations with different carbon chain lengths with sodium indigo disulphonate(IC)and found that when the anions are the same,cations with different carbon chain lengths will result in large variety of morphologies and properties of the ionic materials.In turn,we also used 2,2'-hydrazine-bis(3-ethyl-benzothiazole-6-sulfonic acid)diammonium salt(ABTS),which also has a sulfonate group,with the above-mentioned imidazole cations of different carbon chain lengths.The assembly results showed that the fixation of cations and the change of the functional groups on the anions caused a great change in the morphology and properties of the materials formed,that is,the way in which the ionic materials were formed changed greatly.In this regard,we propose the theory of size matching effects.(2)Moisture sensing application of imidazole cation self-assembled ionic material Cn-IC.We named the ion material obtained by self-assembly of the series of imidazolium cations and sodium indigo disulfide anion(IC)as Cn-IC(n = 8,10,12,14).And use them as sensing materials for humidity sensors to explore their wet performance.Their electrical conductivity in the high relative humidity(RH)atmosphere is expressed as C8-IC>C12-IC>C14-IC>C10-IC.According to various electrochemical characterization results,we speculated that the difference in the distance between the imidazolium cation and the indigo anion that compose the various ion materials leads to the difference in the amount of water molecules that can be filled between them,resulting in the ability of conduction of protons under dissociation of the electric field is different,that is,the macro performance is different in the conductivity.We believe that this work not only provides a new idea for the development of ion-based self-assembled supramolecular materials to form various structures,but also helps to understand the effects of different assembly structures on the performance of ionic materials as well as provides a idea for practical applications to directional assembly the special ionic materials.(3)The application of imidazole cation self-assembly material C14-ABTS in ethanol detection.Based on the special properties of Rh6G-C 14-ABTS material that can stably exist in aqueous solution and have a stimulating response to certain polar solvents and can successfully encapsulate fluorescent dyes,we have designed a method that can instantly detect the content of ethanol.Compared with other traditional methods,this method has a simple principle,rapid response,low cost,and easy operation.Not only that,due to the different performance of different polar solvents,using this method can also effectively distinguish between methanol,identify fake white spirit.Therefore,it is expected to be applied to daily life. |
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