Langmuir-Blodgett and Langmuir-Schaefer films of homoleptic and heteroleptic phthalocyanine complexes as voltammetric sensors:: Applications to the study of antioxidants

被引:60
作者
Casillia, S
De Luca, M
Apetrei, C
Parra, V
Arrieta, AA
Valli, L
Jiang, JZ
Rodríguez-Mendez, ML
De Saja, JA
机构
[1] Univ Valladolid, ETS II, Dept Quim Fis & Quim Inorgan, E-47011 Valladolid, Spain
[2] Univ Lecce, Dipartimento Ingn Innovazione, I-73100 Lecce, Italy
[3] Shandong Univ, Dept Chem, Jinan 250100, Peoples R China
[4] Univ Valladolid, Fac Sci, Dept Fis Mat Condensada, Valladolid, Spain
关键词
phthalocyanine; bisphthalocyanine; naphthalocyanine; double-decker phthalocyanine; triple-decker phthalocyanine; voltammetric sensor; electronic tongue;
D O I
10.1016/j.apsusc.2004.11.002
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Double- and triple-decker phthalocyanine derivatives have been successfully used as the sensitive materials for liquid electrochemical sensors. The materials include homoleptic and heteroleptic phthalocyanine complexes formed by phthalocyanine, porphyrin and naphthalocyanine rings. A high degree of cross-selectiviy towards antioxidant compounds (including vannilic acid, pyrogallol, ascorbic acid and catechin) has been attained by using different phthalocyanine complexes. The features observed in the cyclic voltammograms reflect the rich electrochemistry of either the phthalocyanine molecules or the studied solutions. In consequence, each sensor shows a selective response to the antioxidant analysed. The obtained voltammograms from by using highly ordered electrodes prepared using the Langmuir-Blodgett (LB) or the Langmuir-Schaefer (LS) techniques show better resolution and stability than those of disordered electrodes prepared by casting. For this reason, ordered films have been chosen to construct an array of liquid sensors. The principal component analysis (PCA) of the obtained signals has allowed that a clear discrimination of the antioxidant solutions be achieved. The rich and varied responses produced by antioxidant molecules evidences that voltammetric electrodes based on phthalocyanines, are especially suitable for the analysis of compounds with electrochemical activity. (c) 2004 Elsevier B.V. All rights reserved.
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页码:304 / 312
页数:9
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