Carboxyphenyl metalloporphyrins as photosensitizers of semiconductor film electrodes. A study of the effect of different central metals

Article Abstract:

Free-base 5-(4-carboxyphenyl)-10,15,20-tris(4-methylphenyl) porphyrins (P) and its complexes with Zn(II), Pd(II), Cu(II), and Ni(II) are designed and synthesized in order to use as spectral sensitizers in photoelectrochemical cells. Photocurrent quantum yields increase as the dye ground-state oxidation potential becomes more anodic and this effect could be exploited as a design element in the driving off new and better sensitizers for high-efficiency solar cells involving porphyrins and related dyes.

Argentina, Industrial Organic Chemicals, Cyclic Crude and Intermediate Manufacturing, Porphyrins, Analysis, Oxidation-reduction reaction, Oxidation-reduction reactions, Structure, Photoelectric cells

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Photosensitization of thin SnO2 nanocrystalline semiconductor film electrodes with metallodiporphyrin

Article Abstract:

A porphyrin dyad and its structural components as photosensitizing adsorbates on nanocrystalline SnO2 films, are studied to extend the photoresponse of large band gap semiconductor. The fact that in generation of photoelectrical effects the dyad is less effective in comparison with porphyrin is explained considering that the metallized porphyrin enhances the back electron transfer process, producing low photocurrent yield.

Oxides, Tin compounds, Photosensitizing compounds, Photosensitizing agents

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Electrogenerated chemiluminescence. 81. Influence of donor and acceptor substituents on the ECL of a spirobifluorene-bridged bipolar system

Article Abstract:

The electrochemistry and radical ion annihilation electrogenerated chemiluminescence of spirobifluorene-bridged bipolar systems containing 1,3,4-oxadiazole-conjugated oligoaryl and triarylamine substituents were investigated. The stability of the oxidized spirobifluorene was improved by functionalization with triaryl centers.

Electrochemistry, Fluorine compounds, Chemical properties, Chemiluminescence

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