Influence of Monomers’ Structure on the Assembly and Material Property of Pillar[5]arene‐Based Supramolecular Polymer Gels

Abstract

Main observation and conclusion Pillar[5]arene‐based supramolecular polymer gels (SPGs) show broad application prospects. To investigate the influence of the supramolecular monomers’ structure on the assembly and properties of corresponding pillar[5]arene‐based SPGs, a series of monomers based on different functionalized pillar[5]arene derivatives with various structures were synthesized. There are per‐methylated pillar[5]arene (H1), bromobutane‐functionalized pillar[5]arene (H2), 4‐hydroxybenzaldehyde‐functionalized pillar[5]arene (H3), ethyl thioglycolate‐functionalized pillar[5]arene (H4), thioacetylhydrazine‐functionalized pillar[5]arene (H5), bola‐type bis‐pillar[5]arene (H6) and tripodal‐type tri‐pillar[5]arene (H7). Meanwhile, a neutral tripodal‐guest TG was also employed to co‐assemble with these pillar[5]arene‐based monomers by host‐guest interactions. As a result, under the same conditions (10%, DMSO‐H2O, w/v, 10 mg·mL–1 = 1%), H1 and H2 cannot assemble into SPGs with TG. Interestingly, mono‐p[5] derivatives H3—H5 could assemble into SPGs with TG. More importantly, bis‐p[5] H6 and tri‐p[5] H7 could assemble into supramolecular polymer network gel (SPNG) and supramolecular polymer organic framework gel (SOFG) with TG, respectively. These gels all show blue aggregation‐induced emission (AIE) properties. Among these SPGs, the SPNG shows the best viscoelastic behavior and self‐healing properties. The result is attributed to the flexible network structure of SPNGs. In addition, the xerogels of SOFG and SPNG have shown nice adsorption and separation properties for organic dyes in water solution.

A Pd2L4 Metallacage‐Cored Supramolecular Amphiphile and Its Application in Dual‐Responsive Controllable Release†

“…The value of SLB greater than 0.5 means that the liquid behavior dominates and less than 0.5 implies the solid behavior dominates. [ 66‐67 ] By comparison, the SLB value of the gel increased from 0.21 to 0.59 after adding γ ‐CD (Figure 2b), indicating the dominated effect of liquid behavior after supramolecular gel was destroyed. Based on the above results, we deduce that there was a host–guest interaction between γ ‐CD and the pyrene unit of 1 ·([BF 4 ] – ) 4 , which prevented the π–π stacking between pyrene molecules, and the gel collapsed after the supramolecular network was destroyed.…”

Construction of an Artificial Light-Harvesting System Based on an Aggregation-Induced Emission Type Multiperformance Supramolecular Fluorescent Gel

“…38−40 Therefore, the design and construction of multiperformance gel ALHSs with AIE effect remain a difficult task. 41,42 Based on the above content, our team used poly(vinyl alcohol) as a carrier to…”

“…As a result, many practical applications are restricted. Additionally, ALHSs have received less attention in the gel state. − Therefore, the design and construction of multiperformance gel ALHSs with AIE effect remain a difficult task. , Based on the above content, our team used poly­(vinyl alcohol) as a carrier to construct a fluorescent gel based on AIE effect. Subsequently, ALHSs were constructed by adding acceptors BODIPY 505/515 (BDP) and SR101, and the occurrence of energy transfer was confirmed.…”

A tris-tetrazole based nanostructured soft material: studies on self-healing, AIEE, and rheological and fluorometric detection of 3-aminopyridine

“…19,20 There are only a few studies available where the properties of a gel have been utilized to discriminate between isomeric organic molecules. [21][22][23][24][25] However, the explanation of the discriminating behaviour with theoretical studies of the gel structures and the associated properties which can get influenced by the relative hydrogen bond donor-acceptor sites in the isomers has rarely been explored. To explore such a possibility we have synthesized a tetrazolic gelator molecule, N 2 ,N 4 ,N 6 -tri(1H-tetrazol-5-yl)-1,3,5-triazine-2,4,6-triamine (G8), with a number of hydrogen donor-acceptor sites.…”