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• W2068821054 endingPage "17150" @default.
• W2068821054 startingPage "17138" @default.
• W2068821054 abstract "Light induced reactions of carboxylic, hydroxycarboxylic, and aminocarboxylic acids, carboxylated aromatics, and α-amino acids and peptides adsorbed on hydrated anatase (TiO2), goethite (α-FeOOH), and hematite (α-Fe2O3) have been studied at low temperature (77−200 K), by means of electron paramagnetic resonance (EPR) spectroscopy, and at 295 K, by means of transient absorption spectroscopy. In the room-temperature solution, the photocatalytic decomposition of carboxylated molecules, in the absence of synergistic adsorption by hydroxyl groups (e.g., in serine), is inefficient due to weak surface binding. The yield of radical formation increases significantly at low temperature, as the carboxylated molecules adsorb on the surface. The main photodegradation path is decarboxylation initiated by charge transfer from the metal oxide to the adsorbate. Below 120 K, for carboxylic acids and nonaromatic amino acids and peptides, the decarboxylation is the only reaction pathway, yielding the corresponding C-centered radicals. At higher temperature these radicals become mobile and abstract H from the parent molecules. For aromatic amino acids (histidine, tyrosine, and tryptophan) charge transfer followed by deprotonation is the predominant photoreaction. For polycarboxylated aromatics, the outcome of the charge transfer is determined by the stability of the trapped-hole species. In addition to trapping holes, some adsorbates, such as mellitic acid, trap surface electrons. The photocatalytic activity of the anatase, goethite, and hematite are similar for aromatic, carboxylic, and hydroxycarboxylic acids; for hematite, this activity reduces markedly for α-amino acids and peptides. The rutile is inactive toward these carboxylated molecules. These findings are related to martian soil chemistry, biomedical chemistry, and photocatalysis." @default.
• W2068821054 created "2016-06-24" @default.
• W2068821054 creator A5006669225 @default.
• W2068821054 creator A5083014857 @default.
• W2068821054 date "2009-09-09" @default.
• W2068821054 modified "2023-09-27" @default.
• W2068821054 title "Light Induced Fragmentation of Polyfunctional Carboxylated Compounds on Hydrated Metal Oxide Particles: From Simple Organic Acids to Peptides" @default.
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