Thin films of porphyrins

Thin films of porphyrin-metal polyamides have been prepared by the interfacial polymerization of tetrakis chloride derivatives with either aliphatic dianines or with tetrakis amino derivatives of the porphyrin-metal complexes. Films with thicknesses in the 0.0I-10 im range, display unique chemical asymmetry. Opposite surfaces show different concentrations of functional groups. When placed between identical semitransparent electrodes and irradiated with broad-band or pulsed laser light the films developed directional photopotential. Photopotentials of 25mV were seen. The directionality of the photopotentials is the result of electron transfer toward the acid surface of the asymmetric film. 

Imahori, H., T. Hasobe, H. Yamada, P.V. Kamat, S. Barazzouk, M. Fujitsuka, O. Ito, and S. Fukuzumi (2001). Spectroscopy and photocurrent generation in nanostruc-tured thin films of porphyrin-fullerene dyad clusters. Chem. Lett. 784-785. 

Size-selective Transport of Redox-active Species through Thin Films of Porphyrinic Molecular Squares Featuring Adjustable Cavity Sizes and Tailored Channel Interiors... 

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