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Protonation-Triggered Supramolecular Gel from Macrocyclic Diacetylene: Gelation Behavior, Topochemical Polymerization, and Colorimetric Response
Langmuir ( IF 3.7 ) Pub Date : 2020-11-11 , DOI: 10.1021/acs.langmuir.0c02469 Geon Shin 1 , Mohammed Iqbal Khazi 2 , Jong-Man Kim 1, 2
Langmuir ( IF 3.7 ) Pub Date : 2020-11-11 , DOI: 10.1021/acs.langmuir.0c02469 Geon Shin 1 , Mohammed Iqbal Khazi 2 , Jong-Man Kim 1, 2
Affiliation
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Supramolecular gels originating from the hierarchical self-assembly of low molecular weight organic molecules is a strongly emerging field of advanced material research for the fabrication of soft functional materials. Herein, a novel supramolecular gel was fabricated through the protonation-triggered unidirectional self-assembly of pyridine-attached macrocyclic diacetylene (PyMCDA). Basic nitrogen of a pyridine ring with a strong affinity toward proton transforms the neutral PyMCDA into gelator in its protonated pyridinium salt form (PyMCDA-H+), which further evolves to nano-fibrillar networks to yield a supramolecular gel. Under the irradiation of UV light, the white color gel turned to a robust covalently cross-linked blue-phase PDA gel. Interestingly, polymeric PyMCPDA-H+ gel exhibits a naked-eye detectable reversible blue–red colorimetric response for alternating acid/base (H2SO4/NH4OH) and colorimetric sensitivity toward selected anions: CH3COO−, CN−, HCOO−, and CH3CH2COO−. It is with the hope that this work point toward the utility and versatility of macrocyclic PDAs for constructing chromogenic supramolecular gels for their possible use in sensing systems.
中文翻译：
大环二乙炔的质子化超分子凝胶：胶凝行为，拓扑化学聚合和比色响应。
源自低分子量有机分子的分层自组装的超分子凝胶是用于制造软功能材料的高级材料研究的一个新兴领域。本文中，通过吡啶连接的大环联乙炔（PyMCDA）的质子触发单向自组装制备了一种新型的超分子凝胶。对质子具有强亲和力的吡啶环的碱性氮将中性PyMCDA转化为质子化吡啶鎓盐形式的胶凝剂（PyMCDA-H +），进一步发展成纳米原纤维网络，产生超分子凝胶。在紫外光的照射下，白色凝胶变成牢固的共价交联的蓝相PDA凝胶。有趣的是，聚合PyMCPDA-H +凝胶表现出对交替酸/碱裸眼检测的可逆蓝-红色响应（H 2 SO 4 / NH 4 OH）和朝向选择的阴离子比色灵敏度：CH 3 COO -，CN - ，HCOO -和CH 3 CH 2 COO -。希望这项工作指向大环PDA在构建发色超分子凝胶中的用途和通用性，以使其可能用于传感系统。
更新日期：2020-11-25
中文翻译：
大环二乙炔的质子化超分子凝胶：胶凝行为，拓扑化学聚合和比色响应。
源自低分子量有机分子的分层自组装的超分子凝胶是用于制造软功能材料的高级材料研究的一个新兴领域。本文中，通过吡啶连接的大环联乙炔（PyMCDA）的质子触发单向自组装制备了一种新型的超分子凝胶。对质子具有强亲和力的吡啶环的碱性氮将中性PyMCDA转化为质子化吡啶鎓盐形式的胶凝剂（PyMCDA-H +），进一步发展成纳米原纤维网络，产生超分子凝胶。在紫外光的照射下，白色凝胶变成牢固的共价交联的蓝相PDA凝胶。有趣的是，聚合PyMCPDA-H +凝胶表现出对交替酸/碱裸眼检测的可逆蓝-红色响应（H 2 SO 4 / NH 4 OH）和朝向选择的阴离子比色灵敏度：CH 3 COO -，CN - ，HCOO -和CH 3 CH 2 COO -。希望这项工作指向大环PDA在构建发色超分子凝胶中的用途和通用性，以使其可能用于传感系统。
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