Photoreduction of hemin in alcohol-containing mixed solvents

Photoreduction of Iron(iii)porphyrins

“…In all instances, the following criteria prezene containing various amounts of 2-propanol as vail: characterization of the final product as a ferrous to 5 x Table I Table 1. In aqueous solutions, they are of the same order of magnitude as those reported by Bartocci et al (1980) for the species supposed to be hydroxohemin coordinated by a pyridine molecule.…”

“…Although photochemistry of ferric complexes (Reichgott and Rose, 1977;Ferraudi, 1980) and photocatalyzed oxidation of alcohols to aldehydes or ketones in the presence of ferric compounds (Reichgott and Rose, 1977) are well documented, only a few reports deal with the kinetic studies of the primary steps of the reaction mechanism. Moreover, until recently (Bartocci et al, 1980), no such reactions were reported for ferric porphyrins which were believed as photochemically inert so far (Hoffman and Gibson, 1978).…”

“…species and to specify the reactions involved in the photoreduction process. Thus, although Bartocci et al (1980) reported flash photolysis experiments, no assignment of the observed transients and no quantitative kinetic data were given. In view of their limited data, they suggested four possible mechanisms for explaining the photoreduction of their hemin derivatives.…”

Photoreduction of iron protoporphyrin IX chloride in non‐ionic triton X‐100 micelle studied by electronic absorption and resonance Raman spectroscopy

“…4 -6 Extensive studies have been carried out over the last two decades in elucidating the kinetic and thermodynamics of axial ligation of imidazole and its derivatives to the natural and model iron porphyrins by optical spectroscopy, 7,8 NMR 9,10 and other techniques 11 in organic, coordinating 12 and non-coordinating 13 solvents and in aqueous ethanolic solutions. The photosensitivity of natural iron porphyrins 14 and their model compounds 15 -22 and also of heme proteins 23 in buffer or ethanol 14 and ethanol mixed solvents 15,16 has been well documented. Photoreduction of ferric porphyrins in these solvent systems on irradiation near the Soret band Ł Correspondence to: A. L. Verma, Director, North-Eastern Regional Institute of Science and Technology (NERIST), Nirjuli-791109, India.…”

Applications of Flash Spectroscopy to Molecules of Biological Relevance

“…There have been many studies of Hb and M b by flash photolysis, (for example [ 14,27,34,35,44,64,77,88]) and also by time resolved resonance Raman spectroscopy, (for example [97,99,1031). In addition there have also been several studies of protohaem and related iron-porphyrins as models systems, for example [5, 9,19,22,98].…”