Electrochemically Stimulated pH Changes: A Route To Control Chemical Reactivity,Journal of the American Chemical Society

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Electrochemically Stimulated pH Changes: A Route To Control Chemical Reactivity
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2010-02-17 , DOI: 10.1021/ja9094796
Marco Frasconi ₁ , Ran Tel-Vered ₁ , Johann Elbaz ₁ , Itamar Willner ₁

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A bis-aniline-cross-linked Au nanoparticle (NP) composite is electrochemically prepared on a rough Pt film supported on a Au electrode. The electrochemical oxidation of the bis-aniline units to the quinoid state releases protons to the electrolyte solution, while the reduction of the quinoid bridges results in the uptake of protons from the electrolyte. By the cyclic oxidation of the bridging units (E = 0.25 V vs SCE), and their reduction (E = -0.05 V vs SCE), the pH of the solution could be reversibly switched between the values 5.8 and 7.2, respectively. The extent of the pH change is controlled by the number of electropolymerization cycles applied to synthesize the Au NP composite, demonstrating a ca. 1.5 pH units change by a matrix synthesized using 100 electropolymerization cycles. The pH changes are used to reversibly activate and deactivate a C-quadruplex (i-motif)-bridged Mg(2+)-dependent DNAzyme.

中文翻译：

电化学刺激的 pH 值变化：控制化学反应性的途径

双苯胺交联的 Au 纳米颗粒 (NP) 复合材料是在 Au 电极上支撑的粗糙 Pt 膜上电化学制备的。双苯胺单元电化学氧化为醌态将质子释放到电解质溶液中，而醌式桥的还原导致从电解质中吸收质子。通过桥接单元的循环氧化（E = 0.25 V vs SCE）和它们的还原（E = -0.05 V vs SCE），溶液的 pH 值可以分别在 5.8 和 7.2 值之间可逆地切换。pH 变化的程度由用于合成 Au NP 复合材料的电聚合循环次数控制，表明大约使用 100 个电聚合循环合成的基质会改变 1.5 个 pH 单位。

更新日期：2010-02-17

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