Physicochemical properties of solutions and ultrathin films of triple-decker gadolinium tetra-15-crown-5-phthalocyaninate
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- 作者：1. Frumkin Institute of Physical Chemistry and Electrochemistry ; Russian Academy of Sciences ; Moscow ; Russia2. Kurnakov Institute of General and Inorganic Chemistry ; Russian Academy of Sciences ; Moscow ; Russia
- 刊名：Protection of Metals and Physical Chemistry of Surfaces
- 出版年：2011
- 出版时间：July 2011
- 年：2011
- 卷：47
- 期：4
- 页码：447-456
- 全文大小：316.3 KB
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- 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Tribology, Corrosion and Coatings
Materials Science
Metallic Materials
Inorganic Chemistry
Industrial Chemistry and Chemical Engineering
Characterization and Evaluation Materials - 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
- ISSN：2070-206X
文摘
The ability of the triple-decker gadolinium complex with tetra-15-crown-5-phthalocyanine Gd2(R4Pc)3, (R = 15-crown-5) (1) to form monolayers and Langmuir-Blodgett films (LBFs) was studied for the first time. The charge characteristics of molecules of a triple-decker phthalocyaninate in monolayer, as well as their orientation and adhesion to the water subphase, were controlled by changing the surface pressure, pH, and subphase composition (aqueous solutions containing triethylenetetramine (TETA) and metal cations). It was shown that the presence of Na+ and protonated TETA aminogroups in resulted in an increasing limiting monolayer area and significant decreasing of the monolayer liquid state region. It is proven that the observed effects are caused by the conformational and charge transitions of peripheral crown ethers induced by their interaction with cations. A comparison of the differential reflectance spectra of the complex monolayer on the deionized water surface with UV-Vis absorption spectra of three-layer Gd2(R4Pc)3 LBF and complex solution in chloroform shows that partial complex oxidation and intensive stacking formation occurs already at the stage of monolayer formation on the subphase surface. Electrochemical studies of three-layer LBFs performed at the indium-tin-oxide electrodes (ITO-electrodes) using cyclic voltammetry (CV) showed three reversible redox waves in the potential range −200 to +1100 mV (vs. Ag+/AgCl). All registered peaks remain the same position and intensity upon multiple cycling. plasmon resonance (SPR) measurements allow to register three stable redox states of studied LBF upon applying the external potential. Such behavior shows the possibility to use multistep redox transformations of studied complex LBF for developing of stable and reproducible switchable optoelectronic systems.