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首页> 外文期刊>Chemistry: A European journal >Carbon-Nanotube-Mediated Electrochemical Transition in a Redox-Active Supramolecular Hydrogel Derived from Viologen and an L-Alanine-Based Amphiphile
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Carbon-Nanotube-Mediated Electrochemical Transition in a Redox-Active Supramolecular Hydrogel Derived from Viologen and an L-Alanine-Based Amphiphile

机译：碳纳米管介导的电化学转变在源自紫精和L-丙氨酸两亲物的氧化还原活性超分子水凝胶中。

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摘要

A two-component hydrogelator (16-A)(2)-V2+, comprising an l-alanine-based amphiphile (16-A) and a redox-active viologen based partner (V2+), is reported. The formation the hydrogel depended, not only on the acid-to-amine stoichiometric ratio, but on the choice of the l-amino acid group and also on the hydrocarbon chain length of the amphiphilic component. The redox responsive property and the electrochemical behavior of this two-component system were further examined by step-wise chemical and electro-chemical reduction of the viologen nucleus (V2+/V+ and V+/V-0). The half-wave reduction potentials (E-1/2) associated with the viologen ring shifted to more negative values with increasing amine component. This indicates that higher extent of salt formation hinders reduction of the viologen moiety. Interestingly, the incorporation of single-walled carbon nanotubes in the electrochemically irreversible hydrogel (16-A)(2)-V2+ transformed it into a quasi-reversible electrochemical system.
机译：报道了一种两组分水凝胶剂（16-A）（2）-V2 +，其包含基于1-丙氨酸的两亲物（16-A）和基于氧化还原活性的紫精的伴侣（V2 +）。水凝胶的形成不仅取决于酸与胺的化学计量比，还取决于1-氨基酸基团的选择以及两亲组分的烃链长度。通过分步对紫精核（V2 + / V +和V + / V-0）进行化学和电化学还原，进一步研究了该两组分体系的氧化还原响应特性和电化学行为。随着胺成分的增加，与紫精环相关的半波还原电势（E-1 / 2）移至更多的负值。这表明更高程度的盐形成阻碍了紫精部分的还原。有趣的是，在电化学不可逆水凝胶（16-A）（2）-V2 +中掺入单壁碳纳米管可将其转变为准可逆电化学系统。

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