Multiconformational surfaces in porphyrins: previews into excited-state landscapes

Article Abstract:

Radiographic imaging of crystal structures of the porphyrin compounds ZnDPP, H2DPP and NiDPP were performed. In addition, the multiconformational surfaces of the porphyrin samples were described. Electron paramagnetic resonance studies determined the excitation spectra of the porphyrin molecules. The molecules of ZnDPP and H2DPP exhibited plasticity and varied landscapes within a family of compounds. A correlation between skeletal distortions of excited state lifetimes and the photophysics and chemistry of nonplanar chromophores was observed.

Usage, Proteins, Crystals, Crystal structure, Electron paramagnetic resonance, Excited state chemistry, Protein conformation

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Visible light sensitization of titanium dioxide with self-organized porphyrins: organic P-I-N solar cells

Article Abstract:

The development of organic photovoltaic solar cells is discussed. A self-organized free base 5,10,15,20-tetrakis(4-n-octylphenyl) porphyrin (H2TOPP) is prepared to act as an intrinsic film. It is sandwiched between a titanium dioxide thin film and a zinc 5,10,15,20-tetra (4-carboxyphenyl) porphyrin (ZnTCPP) (p-type) thin film which is also an excellent sensitizer for titanium dioxide. It is shown that the H2TOPP acts as an intrinsic semiconductor and than ZnTCPP acts as a p-type semiconductor.

Organic semiconductors, Photovoltaic cells, Thin films

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Photochemistry of nitrosyl metalloporphyrins: mechanisms of the photoinduced release and recombination of NO

Article Abstract:

Laser flash photolysis was used to prepare and investigate a series of substituted nitrosylmetalloporphyrins of the type M(NO)(meso-tetra(p-X)phenylporphyrin). An examination of the kinetics of the recombination reactions between the metalloporhyrins and NO in THF showed that the recombination mechanism appears more complicated than the simple second-order process earlier reported. One possible explanation is out-of-plane puckering of the porphyrin ring immediately after denitrosylation.

Analysis, Nitric oxide, Metalloproteins, Photochemistry

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