Details

Autor(en) / Beteiligte

• Wamser, Carl C
• Bard, Raymond R
• Senthilathipan, Velu
• Anderson, Valerie C
• Yates, James A
• Lonsdale, Harold K
• Rayfield, George W
• Friesen, Dwayne T
• Lorenz, Douglas A

Titel

Synthesis and photoactivity of chemically asymmetric polymeric porphyrin films made by interfacial polymerization

Ist Teil von

• Journal of the American Chemical Society, 1989-10, Vol.111 (22), p.8485-8491

Ort / Verlag

Washington, DC: American Chemical Society

Erscheinungsjahr

1989

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.