The reaction of nitrite with ferric and ferrous porphyrins was examined using visible, infrared and NMR spectroscopy. Solutions of either ferric or ferrous porphyrin were stable in the presence of nitrite, with only complexation reactions being observed. Under voltammetric conditions, though, a rapid reaction between nitrite and iron porphyrins was observed to form the nitrosyl complex, Fe(P)(N...

Porphyrins are among the most important macrocycles because they perform many essential functions in living systems and serve as building blocks functional materials. Incorporating chirality into porphyrins can aid biomimetic research exploration of new In this review, recent developments chiral porphyrin assemblies highlighted. The review is mainly divided two sections: different strategies fo...

Electrochemical studies of the oxidation of dodecasubstituted and highly nonplanar nickel porphyrins in a noncoordinating solvent have previously revealed the first nickel(III) porphyrin dication. Herein, we investigate if these nonplanar porphyrins can also be used to detect the so far unobserved copper(III) porphyrin dication. Electrochemical studies of the oxidation of (DPP)Cu and (OETPP)Cu ...

Autism spectrum disorder (ASD) is a neurodevelopmental disorder believed to be associated with heavy metal exposure, especially mercury (Hg), and is characterized by disturbances in metal elimination. Various studies correlated elevated heavy metal body burden with ASD diagnoses as evidenced by increased urinary porphyrin levels in patients. Urinary porphyrins were also determined in Korean pat...

We report the effect of sample matrix and pH on quantification of porphyrins by HPLC with fluorimetric detection. For aqueous solutions of pH less than 2.5, HPLC peak heights of the porphyrins increased with decreasing pH, reaching a plateau at pH less than 1.0. This loss of porphyrins from solutions with pH greater than 1.0 appeared to be due to a combination of microprecipitation and aggregat...

We report CF3-substituted porphyrins and evaluate their use as photosensitizers in water-splitting dyesensitized photoelectrochemical cells (WS-DSPECs) by characterizing interfacial electron transfer on metal oxide surfaces. By using (CF3)2C6H3 instead of C6F5 substituents at the meso positions, we obtain the desired high potentials while avoiding the sensitivity of C6F5 substituents to nucleop...

To investigate the effects of electron-donating and electron-withdrawing substituents upon the reaction of porphyrins with osmium tetraoxide, and the pinacol-pinacolone rearrangement of the resulting diols, a series of meso-substituted porphyrins were prepared by total synthesis. Porphyrins with electron-donating substitutents at the meso-positions gave vic-dihydroxychlorins in which the adjace...

Combination of apocytochrome c peroxidase with various porphyrins such as proto-, hemato-, meso-, and deuteroporphyrins IX was investigated. These porphyrins combined with the apoprotein with a molar stoichiometry of 1: 1 to form well defined porphyrin-protein complexes. The complexes were further purified by chromatography on diethylaminoethyl cellulose columns and crystallized by dialysis aga...

BACKGROUND Porphyria cutanea tarda (PCT) is caused by hexachlorobenzene (HCB) in several species of laboratory mammals, but the human evidence is contradictory. In a study among adults of a population highly exposed to HCB (Flix, Catalonia, Spain), the prevalence of PCT was not increased. We aimed at analysing the association of individual urinary porphyrins with the serum concentrations of HCB...

8 ABSTRACT: We report CF3-substituted porphyrins and 9 evaluate their use as photosensitizers in water-splitting dye10 sensitized photoelectrochemical cells (WS-DSPECs) by 11 characterizing interfacial electron transfer on metal oxide 12 surfaces. By using (CF3)2C6H3 instead of C6F5 substituents at 13 the meso positions, we obtain the desired high potentials while 14 avoiding the sensitivity of...