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Molecular electrocatalysis for oxygen reduction by cobalt porphyrins adsorbed at liquid/liquid interfaces
Scopus
Toplam 141 atıf DOI
Molecular electrocatalysis for oxygen reduction at a polarized water/1,2-dichloroethane (DCE) interface was studied, involving aqueous protons, ferrocene (Fc) in DCE and amphiphilic cobalt porphyrin catalysts adsorbed at the interface. The catalyst, (2,8,13,17-tetraethyl-3,7,12,18-tetramethyl-5-p- amino-phenylporphyrin) cobalt(II) (CoAP), functions like conventional cobalt porphyrins, activating O2 via coordination by the formation of a superoxide structure. Furthermore, due to the hydrophilic nature of the aminophenyl group, CoAP has a strong affinity for the water/DCE interface as evidenced by lipophilicity mapping calculations and surface tension measurements, facilitating the protonation of the CoAP-O2 complex and its reduction by ferrocene. The reaction is electrocatalytic as its rate depends on the applied Galvani potential difference between the two phases. © 2010 American Chemical Society.
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Oxygen reduction catalyzed by aniline derivatives at liquid/liquid interfaces
Scopus
Havuzumuzda 12 atıf almış
Oxygen reduction reaction (ORR) by decamethylferrocene (DMFc) at a water/1,2-dichloroethane (DCE) interface proceeds as a proton coupled electron transfer process, with the supply of protons by the aqueous phase and electrons by the electron donor DMFc in the organic phase. In the present work, the reduction of oxygen by DMFc has been investigated in the presence of different aniline derivatives such as 3,5,N,N-Tetramethylaniline (TMA), N,N-Diethylaniline (DEA), 4-Nitroaniline (4-NA), 4-Dodecylaniline (4-DA) which act as proton ionophores to transfer protons from the aqueous to the organic phase. It has been found that ORR by DMFc can be catalyzed efficiently by the use of aniline derivatives depending on their basicity strength which follows an order of DEA > TMA > 4-DA > 4- NA. © 2012 Elsevier B.V. All rights reserved.
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Selçuk Üniversitesi
Selçuklu, Turkey