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.
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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
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发表时间:
2010
期刊:
影响因子:
--
通讯作者:
Collins AM
中科院分区:
文献类型:
--
作者:
Collins AM
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.
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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
影响因子:
5.4
作者:
M. Ghanem;F. Marken
通讯作者:
F. Marken
影响因子:
5.4
作者:
E. Bąk;M. Donten;Z. Stojek;F. Scholz
通讯作者:
F. Scholz
影响因子:
2.5
作者:
J. Wadhawan;R. Compton;F. Marken;S. Bull;S. Davies
通讯作者:
S. Davies
影响因子:
2.8
作者:
V. Korobov;V. Shubin;A. K. Chibisov
通讯作者:
A. K. Chibisov