Metal-triggered supramolecular hydrogels based on bipyridine ligand possessing hydrazine moieties with metal ions

IF 1.7 4区化学 Bulletin of the Korean Chemical Society Pub Date : 2024-02-06 DOI:10.1002/bkcs.12818

Kayeong Go, Sehee Kim, MinHye Kim, Heekyoung Choi, Sung Ho Jung, Jong Hwa Jung

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Abstract

Bipyridine-based gelator 1 having two D-alanine units was prepared, and its gelation ability was evaluated in the presence of Co(NO₃)₂ and AgNO₃ in water. Gelator 1 could gelate H₂O in the presence of Co(NO₃)₂ or AgNO₃ (1.0 equiv.) in water. Gelator 1 formed a 2:1 (1:Co²⁺) octahedral complex with Co²⁺, whereas it formed a 2:1 (1:Ag⁺) tetrahedral complex with Ag⁺. The metallosupramolecular hydrogel with Co²⁺ assembled into a left-handed helical fiber, whereas that with Ag⁺ assembled into a nanorod structure. ¹H NMR and FTIR analyses revealed that π–π stacking and intermolecular hydrogen bonds acted as the driving force for the formation of the supramolecular nanoarchitectures. Furthermore, to characterize the viscoelastic properties of hydrogels, rheology experiments were conducted at 25°C, including time, strain, and frequency sweeps.

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基于具有金属离子肼基的联吡啶配体的金属触发超分子水凝胶

制备了具有两个 D-丙氨酸单元的双吡啶基凝胶剂 1，并评估了其在水中有 Co(NO3)2 和 AgNO3 存在时的凝胶化能力。凝胶剂 1 在水中有 Co(NO3)2 或 AgNO3（1.0 等当量）存在时可凝胶化 H2O。凝胶剂 1 与 Co2+ 形成 2:1 （1:Co2+）八面体络合物，而与 Ag+ 形成 2:1 （1:Ag+）四面体络合物。含有 Co2+ 的金属超分子水凝胶组装成左旋螺旋纤维，而含有 Ag+ 的金属超分子水凝胶则组装成纳米棒结构。1H NMR 和 FTIR 分析表明，π-π 堆积和分子间氢键是超分子纳米结构形成的驱动力。此外，为了表征水凝胶的粘弹性能，还在 25°C 温度下进行了流变学实验，包括时间、应变和频率扫描。

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来源期刊

Bulletin of the Korean Chemical Society Chemistry-General Chemistry

自引率

23.50%

发文量

182

期刊介绍： The Bulletin of the Korean Chemical Society is an official research journal of the Korean Chemical Society. It was founded in 1980 and reaches out to the chemical community worldwide. It is strictly peer-reviewed and welcomes Accounts, Communications, Articles, and Notes written in English. The scope of the journal covers all major areas of chemistry: analytical chemistry, electrochemistry, industrial chemistry, inorganic chemistry, life-science chemistry, macromolecular chemistry, organic synthesis, non-synthetic organic chemistry, physical chemistry, and materials chemistry.