STRUCTURAL CHARACTERIZATION OF SOLID SELF-ORDERED THIN-FILMS OF ZINC(II) AND PALLADIUM(II) OCTAKIS(BETA-DECOXYETHYL)PORPHYRIN

Raman spectra of zinc(II) and palladium(II) octakis(beta-decoxyethyl)p orphyrins as thin solid films in a photoelectrochemical cell were comp ared to those of the same compounds in dilute CS2. Polaization measure ments indicate that both porphyrins distort from D-4h symmetry upon ag gregation to the solid state. The orientation of the porphyrins within the thin films was examined by polarized Raman spectroscopy, indicati ng the planes of the porphyrin molecules are tilted about 35 degrees f rom the substrate surface. X-ray diffraction studies of an ordered thi n film of the zinc(II) octakis(beta-decoxyethyl)porphyrin indicate tha t the film is highly oriented and suggest an interporphyrin distance o f ca. 4 Angstrom.