Synthesis and photoactivity of chemically asymmetric polymeric porphyrin films made by interfacial polymerization
| Autor: | Robert A. Ransdell, Paul Van Eikeren, Velu Senthilathipan, Valerie C. Anderson, Suzanne E. Clarke, John H. Golbeck, Douglas Alan Lorenz, James A. Yates, Dwayne Thomas Friesen, Donald R. Baer, Walter C. Babcock, Carl C. Wamser, John J. Sandberg, Gregory C. Stangle, Raymond R. Bard, Harold K. Lonsdale, George W. Rayfield |
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| Rok vydání: | 1989 |
| Předmět: | |
| Zdroj: | Journal of the American Chemical Society. 111:8485-8491 |
| ISSN: | 1520-5126 0002-7863 |
| Popis: | Thin polymeric porphyrin films have been prepared by interfacial polymerization of a pair of reactive comonomers, one or both of which are derivatized tetraphenylporphyrins. Combinations that have successfully yielded polymeric films include the following: tetrakis(4-aminophenyl)porphyrin (TAPP) in DMSO with tetrakis(4-(chlorocarbonyl)phenyl)porphyrin (TCCPP) in ethyl acetate, various aliphatic diamines in water with TCCPP in chloroform, various aliphatic diacyl chlorides in hexane with TAPP in DMSO, tetrakis(4-hydroxyphenyl)porphyrin (THPP) in aqueous base with TCCPP in chloroform, and ZnTHPP in aqueous base with CuTCCPP in chloroform. The films display a unique chemical asymmetry, in the sense that opposite surfaces of the films show distinctive differences in the concentration and type of functional groups that are present, demonstrated by x-ray photoelectron spectroscopy (XPS) and by contact angle studies. When placed between identical semitransparent electrodes and irradiated with either broad-band light or a pulsed laser, these films develop directional photopotentials, whereby the film surface that was prepared in contact with the TCCPP solution (the acid surface) develops a more negative potential than the opposite (amine or hydroxyl) surface. |
| Databáze: | OpenAIRE |
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