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Photo-oxidation of hydrated Fe2+—significance for banded iron formations
The Precambrian banded iron formations (BIFs) are the major iron ore sources on the Earth. They consist of extensive iron-rich and iron-poor layers within siliceous sedimentary rocks1,2. The banding… Expand
Photo-oxidation of iron(II) in water between pH 7.5 and 4.0
Photo-oxidation of [Fe(H2O)6]2+ proceeds at λ 6.5, however, the photochemistry is dominated by the species [Fe(OH)]+(aq), which is photo-oxidised to FeIII even by filtered light of λ > 400 nm,… Expand
Charge transfer in peptides. Effects of temperature, peptide length and solvent conditions upon intramolecular one-electron reactions involving tryptophan and tyrosine
Tryptophyl-tyrosyl peptides, TrpH-(Gly)n-TyrOH and cyclic c-TrpH-TyrOH, were oxidised selectively at the indole group with electron accepting radicals (N˙3 or Br˙–2) in aqueous solution, using pulse… Expand
PHOTOINITIATION OF ONE ELECTRON REACTIONS IN DIPEPTIDES AND PROTEINS CONTAINING TRYPTOPHAN AND TYROSINE
A radical transformation of the type Trṗ‐TyrOH → TrpH‐TyrȮ, previously observed by pulse radiolysis, has been detected following 265 nm laser excitation of oxygen saturated neutral aqueous solutions… Expand
THE TRIPLET STATE OF 8‐METHOXYPSORALEN
Abstract— Transient absorption spectra produced by laser flash photolysis of an aqueous solution of 8‐methoxypsoralen (8‐MOP) have been studied. The biphotonic production of hydrated electrons and of… Expand
The radical ions and photoionization of bile pigments.
The semireduced, semioxidized, and OH(.)-adduct radicals of bilirubin (BR) and biliverdin (BV) have been characterized using pulse radiolysis techniques. Laser flash photolysis (265-nm) of these… Expand
THE QUANTUM YIELD FOR BILIRUBIN PHOTOISOMERISATION
Abstract— The difference extinction coefficient, dL500, for the photoisomerisation of bilirubin (BR) bound to human serum albumin is determined, by isolation of the product, as 4000 1000 mol‐1 dm3… Expand
EXCITED STATES OF BILIRUBIN
Abstract— The excited states of bilirubin (BR) in a variety of environments have been studied by 347 nm laser flash photolysis. Quantum yields of formation of triplet BR have been shown to be less… Expand
Direct observation of hydrated electrons in the u.v. photo-oxidation of [Fe(H2O)6]2+
Hydrated electrons are involved as intermediates in the photo-oxidation of [Fe(H2O)6]2+ to FeIII species in water at 265 nm.