Zinc uroporphyrin

The important role of chlorophylls in photosynthesis inspired people looking for ways to apply these natural porphyrins in DSSC as light harvesting sensitizers. The use of zinc and antimony metallo-uroporphyrins M-UP (105) as photosensitizers... 

Phthalocyanines and metallophthalocyanines have been intensively studied as discotic liquid crystals,but porphyrins have received less attention. The first examples of porphyrin discotic phases were based on naturally occurring uroporphyrins but showed a very narrow discotic LC range. However, octa—substituted porphyrins can show discotic meso-phases over a broad temperature range, the LC phase being stabilised by metal insertion into the porphyrin, e.g. zinc. These materials are organic semiconductors whose LC properties allow them to form highly ordered thin films in the solid state. Emission, excitation and absorption spectra in... 

Marks GS (1985) Exposure to toxic agents the heme biosynthetic pathway and hemoproteins as indicator. Crit Rev Toxicol 15 151-179 Martinez G, Cebrian M, Chamorro G, Jauge P (1983) Urinary uroporphyrin as an indicator of arsenic exposure in rats. Proc West Pharmacol Soc 26 171 Mayo Medical Laboratories Interpretive Handbood (1990) Mayo Medical Laboratories, Rochester, MN, pp 149-152 Meredith PA, Moore MR, Goldberg A (1974) The effects of aluminum, lead and zinc on ( -aminolevulinic acid dehydratase. Biochem Soc Trans 2 1243-1245 Millar JA, Gumming RL, Battistini V, Cabswell F, Goldberg A (1970) Lead and S-aminolevulinic acid dehydratase levels in mentally retarded children and in lead-poisoned suckling rats. Lancet ii 695-698... 

The structural volume changes for triplet formation of metal-free uroporphyrin (-0.45 cm moL ) and of its zinc complex (-1.1 cm moL ), as well as the structural volume changes due to electrostriction after electron transfer from Zn-uroporphyrin to a quinone (-4.4 cm moL ). were estimated in aqueous solutions. The entropy change due to ion formation was then estimated as -202 kJ moL K for the latter system. 

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