Triple phase boundary photovoltammetry: resolving rhodamine B reactivity in 4-(3-phenylpropyl)-pyridine microdroplets.

Triple phase boundary photovoltammetry: resolving rhodamine B reactivity in 4-(3-phenylpropyl)-pyridine microdroplets.
复制标题

三相边界光电伏安法:解析 4-(3-苯基丙基)-吡啶微滴中罗丹明 B 的反应性。

DOI:
10.1002/cphc.200000094
复制
发表时间:
2010
期刊:
a European journal of chemical physics and physical chemistry
影响因子:
--
通讯作者:
Collins AM
Collins AM
中科院分区:
--
文献类型:
--
作者:
Collins AM

文献摘要

参考文献

相似文献

罗丹明 B 基用作液体中的光活性氧化还原系统 | 液体 | 电极三相界面电化学实验。将含有罗丹明 B 的与水不混溶的 3-(4-苯基丙基)-吡啶 (PPP) 微滴沉积到基面热解石墨电极表面上,然后将其浸入含有 0.5M 磷酸盐缓冲溶液 (pH 12) 的水溶液中。循环伏安实验表明,PPP 中罗丹明 B 暗还原为无色罗丹明 B 分两步进行,均为单电子过程,而再氧化则发生在单个双电子过程中。伏安信号与与电子转移耦合的Na+转移(对于第一还原步骤)和质子转移(对于第二还原步骤)一致。对于单电子还原中间体,观察到质子驱动的歧化反应(kdis=3 mol−1dm3s−1,pH 12)。在光存在下,观察到一种新的光催化氧化过程,用于将无色罗丹明 B 转化为罗丹明 B。罗丹明 B 的光激发被证明可以触发有效的光致配比机制。通过比较罗丹明 B 和罗丹明 B 十八酯并应用基于 DigiSim 的近似数值模拟程序,获得了对暗光和光机制的定量见解。
Rhodamine B base is employed as a photoactive redox system in a liquid | liquid | electrode triple phase boundary electrochemical experiment. Microdroplets of the water‐immiscible 3‐(4‐phenylpropyl)‐pyridine (PPP) containing rhodamine B are deposited onto a basal plane pyrolytic graphite electrode surface which is then immersed into an aqueous solution containing 0.5Mphosphate buffer solution (pH 12). In cyclic voltammetry experiments, it is shown that dark reduction of rhodamine B to leuco‐rhodamine B in PPP occurs in two steps—both one electron processes—and the re‐oxidation occurs in a single two‐electron process. Voltammetric signals are consistent with Na+transfer (for the first reduction step) and proton transfer (for the second reduction step) coupled to the electron transfer. A proton‐driven disproportionation reaction (withkdis=3 mol−1dm3s−1at pH 12) is observed for the one‐electron reduced intermediate. In the presence of light, a new photocatalysed oxidation process for the two‐electron conversion of leuco‐rhodamine B to rhodamine B is observed. Photoexcitation of rhodamine B is shown to trigger an effective photo‐comproportionation mechanism. Quantitative insights into the dark and photomechanisms are obtained by comparison of rhodamine B and rhodamine B octadecylester and by applying an approximate numerical simulation procedure based on DigiSim.
对局限于电极的飞升液滴内的光化学反应进行电化学探测。
DOI: 10.1002/cphc.200300845
发表时间: 2003
期刊: Chemphyschem : a European journal of chemical physics and physical chemistry
影响因子: --
作者:
J. Wadhawan;A. Wain;R. Compton
通讯作者: R. Compton
用于电极∣液体∣液体的介孔铂主体 – 三相边界氧化还原系统
DOI: 10.1016/j.elecom.2005.09.013
发表时间: 2005
影响因子: 5.4
作者:
M. Ghanem;F. Marken
通讯作者: F. Marken
刺穿液滴电极——一种具有明确几何形状的新型三相电极
DOI: 10.1016/j.elecom.2006.09.032
发表时间: 2007
影响因子: 5.4
作者:
E. Bąk;M. Donten;Z. Stojek;F. Scholz
通讯作者: F. Scholz
DOI: 10.1007/s100080000164
发表时间: 2001
影响因子: 2.5
作者:
J. Wadhawan;R. Compton;F. Marken;S. Bull;S. Davies
通讯作者: S. Davies
罗丹明染料的三重态及其在中间体生产中的作用
DOI: 10.1016/0009-2614(77)80074-2
发表时间: 1977
影响因子: 2.8
作者:
V. Korobov;V. Shubin;A. K. Chibisov
通讯作者: A. K. Chibisov