Gui Mingliang, Han Yifei, Zhong Hua, Liao Rui, Wang Feng
CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China.
Molecules. 2021 May 10;26(9):2832. doi: 10.3390/molecules26092832.
Cooperative supramolecular polymerization of π-conjugated compounds into one-dimensional nanostructures has received tremendous attentions in recent years. It is commonly achieved by incorporating amide linkages into the monomeric structures, which provide hydrogen bonds for intermolecular non-covalent complexation. Herein, the effect of amide linkages is elaborately studied, by comparing supramolecular polymerization behaviors of two structurally similar monomers with the same platinum(II) acetylide cores. As compared to the -phenyl benzamide linkages, -[(1)-1-phenylethyl] benzamide linkages give rise to effective chirality transfer behaviors due to the closer distances between the chiral units and the platinum(II) acetylide core. They also provide stronger intermolecular hydrogen bonding strength, which consequently brings higher thermo-stability and enhanced gelation capability for the resulting supramolecular polymers. Supramolecular polymerization is further strengthened by varying the monomers from monotopic to ditopic structures. Hence, with the judicious modulation of structural parameters, the current study opens up new avenues for the rational design of supramolecular polymeric systems.
近年来，π共轭化合物协同超分子聚合形成一维纳米结构受到了极大关注。这通常是通过将酰胺键引入单体结构来实现的，酰胺键为分子间非共价络合提供氢键。在此，通过比较两种具有相同铂（II）乙炔核心的结构相似单体的超分子聚合行为，对酰胺键的作用进行了深入研究。与-苯基苯甲酰胺键相比，-[(1)-1-苯乙基]苯甲酰胺键由于手性单元与铂（II）乙炔核心之间的距离更近，产生了有效的手性转移行为。它们还提供了更强的分子间氢键强度，从而为所得超分子聚合物带来更高的热稳定性和增强的凝胶化能力。通过将单体从单齿结构变为双齿结构，超分子聚合进一步增强。因此，通过合理调节结构参数，本研究为超分子聚合物体系的合理设计开辟了新途径。
