期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 198, 期 -, 页码 633-643出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0927-7757(01)00981-5
关键词
metal ion coordination; layer-by-layer self-assembly; thin films; polyelectrolytes; electrochemistry
Metal ion mediated self-assembly of the ditopic ligand 1,4-bis(2,2':6',2-terpyridine-4'-yl)benzene and Co(II) results in a metallo-supramolecular coordination polyelectrolyte (Co-MEPE), which is analyzed by spectroscopic methods, elemental analysis and cyclovoltammetry. The Co-MEPE shows a reversible one-electron redox transition in the potential range from -0.15 to 0.35 V with a half-wave potential of 87 mV. Thin films of Co-MEPE are fabricated by layer-by-layer self-assembly together with poly(styrenesulfonate) (PSS) on planar substrates and are analyzed by UV/vis spectroscopy, microgravimetry, and electrochemistry. The Co-ions in the multilayer can be removed and displaced by Fe-ions. The electrochemical activity of the Co-ions is fully maintained in the films. Charge transport through the multilayer is consistent with electron self-exchange reactions. The permeability of the multilayers is investigated by electrochemistry using K-3[Fe(CN)(6)] as electroactive probe. Compared to poly(allylamine hydrochloride) (PAH)/PSS films, the electroactive probe does not permeate through PSS/Co-MEPE multilayers, Fluorescence measurements with pyrene as polarity probe indicate that the Co-MEPE films are more hydrophobic than PAH/PSS multilayers. (C) 2002 Elsevier Science B.V. All rights reserved.
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