کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10276083 | 463416 | 2005 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Electro- and magneto-electrochemistry of zeolite Y- and MCM-41-associated bipyrylium ion
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
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چکیده انگلیسی
The electrochemical response of bipyrylium bication [1,4-bis(3,5-diphenyl-4-pyrylium)phenylene] associated with Y and MCM-41 aluminosilicates (BTP@Y and BTP@MCM, respectively) is described using polymer-film electrodes immersed into Et4N+Â +Â MeCN and Bu4N+Â +Â MeCN electrolytes. BTP@MCM provides a solution-like response in all electrolytes consisting in two successive strongly comproportionation mediated one-electron reduction processes near to +0.05 and â0.12 V vs. Ag|AgCl. The response of BTP@Y in Bu4N+Â +Â MeCN is restricted to a unique reduction process near to â0.40 V, while in Et4N+Â +Â MeCN, it differs significantly: here, two reduction processes at â0.22 and â0.36 V appear. This response suggests the presence of different boundary-associated topological redox isomers for which no significant comproportionation reaction occurs. Under the application of a static magnetic field, the electrochemical response of BTP@MCM remains almost unchanged while that of BTP@Y in contact with Et4N+Â +Â MeCN is sensitive to changes in the orientation and strength of the external magnetic field. Such magnetoelectrochemical effects are consistent with the idea that different boundary-associated orientation isomers of BTP@Y exist.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Electroanalytical Chemistry - Volume 577, Issue 2, 1 April 2005, Pages 249-262
Journal: Journal of Electroanalytical Chemistry - Volume 577, Issue 2, 1 April 2005, Pages 249-262
نویسندگان
Antonio Doménech, Hermenegildo GarcÃa, Esther Carbonell,