Electrochemistry of 6-Nitro-1‘,3‘,3‘-trimethylspiro[2H-1-benzopyran-2,2‘-indoline] Associated with Zeolite Y and MCM-41 Silicates. Light-Driven Site-Selective Electrocatalytic Effect onN,N,N‘,N‘,-Tetramethylbenzidine Oxidation

Autor:	Antonio Domenech, Mercedes Esplá, Isabel Casades, Hermenegildo García
Rok vydání:	2004
Předmět:	Inorganic chemistry Electrolyte Electrochemistry Medicinal chemistry Surfaces Coatings and Films Benzopyran Nitrobenzene chemistry.chemical_compound chemistry Indoline Materials Chemistry Nitro Physical and Theoretical Chemistry Zeolite Voltammetry
Zdroj:	The Journal of Physical Chemistry B. 108:20064-20075
ISSN:	1520-5207 1520-6106
DOI:	10.1021/jp046832r
Popis:	The electrochemical response of open/closed forms of 6-nitro-1‘,3‘,3‘-trimethylspiro[2H-1-benzopyran-2,2‘-indoline] (SP) associated with zeolite Y (SP@Y) and MCM-41 silicates with or without framework Al (SP@AlMCM and SP@MCM, respectively) is described upon immersion of zeolite-modified polymer film electrodes into MeCN using LiClO4, Et4NClO4, and Bu4NPF6 as supporting electrolytes. These samples show a reverse photochemical behavior, the open form undergoing ring closure to the closed one upon illumination with visible light (λ > 450 nm). Oxidation processes at +1.10 and +0.80 V vs AgCl (3 M NaCl)/Ag, corresponding to open and closed SP, respectively, exhibit a significant reversibility, suggesting that post-electron-transfer reactions resulting in the apparently irreversible voltammetry observed in solution are highly hindered here. Reduction of all boundary-associated SP forms occurs in two reversible one-electron steps involving the nitrobenzene group. Upon irradiation, SP@Y shows a remarkable site-se...
Databáze:	OpenAIRE
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