Iodine speciation in deep eutectic solvents.
Iodine speciation in deep eutectic solvents.
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低共熔溶剂中的碘形态。
DOI：
10.1039/d2cp03185j
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Hartley JM
中科院分区：
文献类型：
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作者：
Hartley JM
碘已被证明可以作为低共熔溶剂 (DES) 中金属消解的良好电催化剂，但对其在这些高氯化物介质中的形态或反应性知之甚少。在一系列具有不同乙醇酸或酸性氢键供体 (HBD) 的 DES 中，在碘 K 边缘进行了扩展 X 射线吸收精细结构 (EXAFS) 光谱测量，并检查了 0.01 至 0.5 mol dm−3 之间碘浓度的影响。检测到三组形态：混合 I2Cl−/I3−（乙二醇和乳酸系统）、混合 I3−/I2（草酸和尿素系统）和单一 I3−（乙酰丙酸系统）。使用紫外可见光谱来确认形态。电化学表明碘氧化还原行为不受形态变化的影响。浸出数据表明，金属氧化不仅与碘形态的变化有关，还与HBD的反应性和配位能力有关。
Iodine has been shown to act as a good electrocatalyst for metal digestion in deep eutectic solvents (DESs) but little is known about its speciation or reactivity in these high chloride containing media. Extended X-ray absorption fine structure (EXAFS) spectroscopy measurements were made at the iodine K-edge in a range of DESs with different glycolic or acidic hydrogen bond donors (HBDs), along with examining the effect of iodine concentration between 0.01 and 0.5 mol dm−3. Three groups of speciation were detected: mixed I2Cl−/I3− (glycol and lactic acid systems), mixed I3−/I2 (oxalic acid and urea systems), and singular I3− (levulinic acid system). UV-vis spectroscopy was used to confirm the speciation. Electrochemistry showed that iodine redox behaviour was unaffected by the changing speciation. Leaching data showed that metal oxidation was related not only to changing iodine speciation, but also the reactivity and coordination ability of the HBD.