Results 291 to 300 of about 167,383 (325)
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Chemistry – A European Journal, 2008
AbstractFour tetrathiafulvalene (TTF)‐annulated porphyrins 1–4 were synthesized and characterized. All contain a tetraphenylporphyrin (TPP) core onto which four, two, or one TTF subunits were annulated. Absorption and fluorescence spectroscopic studies together with electrochemical investigations reveal that interactions between the porphyrin system ...
Nielsen, Kent-A. +4 more
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AbstractFour tetrathiafulvalene (TTF)‐annulated porphyrins 1–4 were synthesized and characterized. All contain a tetraphenylporphyrin (TPP) core onto which four, two, or one TTF subunits were annulated. Absorption and fluorescence spectroscopic studies together with electrochemical investigations reveal that interactions between the porphyrin system ...
Nielsen, Kent-A. +4 more
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American Journal of Industrial Medicine, 2002
AbstractBackgroundTo evaluate the possible effect of inorganic arsenic (iAs) and of its species on the urinary excretion of porphyrin homologues.MethodsTotal porphyrins and their homologues (copro, penta, hexa, hepta, uroporphyrins) and arsenic species (trivalent and pentavalent As; monomethyl arsonic acid; dimethyl arsinic acid; arsenobetaine) were ...
APOSTOLI, Pietro +3 more
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AbstractBackgroundTo evaluate the possible effect of inorganic arsenic (iAs) and of its species on the urinary excretion of porphyrin homologues.MethodsTotal porphyrins and their homologues (copro, penta, hexa, hepta, uroporphyrins) and arsenic species (trivalent and pentavalent As; monomethyl arsonic acid; dimethyl arsinic acid; arsenobetaine) were ...
APOSTOLI, Pietro +3 more
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Self-assembly of porphyrin–azulene–porphyrin and porphyrin–azulene conjugates
Organic & Biomolecular Chemistry, 2009In this paper we report the synthesis and self-assembling behavior of new porphyrin-azulene-porphyrin and porphyrin-azulene conjugates. The porphyrin-azulene-porphyrin conjugate gelates a number of organic solvents, while the porphyrin-azulene conjugates form vesicles in a chloroform-methanol binary mixture.
Xi-Kui Jiang +3 more
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Schiff Base Porphyrin and Expanded Porphyrin Analogues
ChemInform, 2004AbstractFor Abstract see ChemInform Abstract in Full Text.
Wyeth Callaway +2 more
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Porphyrins and Hepatotoxicitya
Annals of the New York Academy of Sciences, 1987Human porphyrias are rare inborn disorders of porphyrin metabolism. Porphyria cutanea tarda is one such disorder, which may occur spontaneously after the ingestion of drugs and alcohol. This is the "constitutional" type and is associated with a deficiency of uroporphyrinogen decarboxylase in the liver.
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Hole Mobility in Porphyrin- and Porphyrin-Fullerene Electropolymers
The Journal of Physical Chemistry B, 2012Charge transport within films of several new types of electropolymerized porphyrin and porphyrin-fullerene dyad polymers was studied in order to obtain information on the suitability of these organic semiconductors for applications in solar energy conversion, sensor devices, etc.
Bradley J. Brennan +4 more
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The Biochemistry of the Porphyrins
Clinics in Haematology, 1980SUMMARY This chapter has reviewed the means by which haem and porphyrins are synthesized and degraded, and some of the biological roles of these compounds. It has also dealt with systems of control of the biosynthetic pathway, and the importance of these control mechanisms in cellular homeostasis.
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Nanotechnology, 2012
A new cationic silver N-alkylpyridylporphyrin complex is able to 'sense' nanometric conductive particles with a diameter below 10 nm. The luminescence of the molecule changes its maximum from red to blue when it embraces a conductive (metallic or semiconducting) nanoparticle.
G A M, Safar +5 more
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A new cationic silver N-alkylpyridylporphyrin complex is able to 'sense' nanometric conductive particles with a diameter below 10 nm. The luminescence of the molecule changes its maximum from red to blue when it embraces a conductive (metallic or semiconducting) nanoparticle.
G A M, Safar +5 more
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The Universe of Porphyrins [PDF]
, 1980 The simplest member of the porphyrin class of compounds is porphine — a planar molecule comprising four pyrrole rings linked by methene bridges. Strongly stabilized by aromatic conjugation, porphine absorbs in the visible range with electronic transitions giving rise to an intense absorption band in the optical blue: the Soret band just below 400 nm ...
C. G. Whiteley, G. W. Hodgson
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