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Radical intermediates in photoinduced reactions on TiO2 (an EPR spin trapping study)

Molecules (Basel, Switzerland), 2014-10, Vol.19 (11), p.17279-17304 [Peer Reviewed Journal]

Copyright MDPI AG 2014 ;2014 by the authors. 2014 ;ISSN: 1420-3049 ;EISSN: 1420-3049 ;DOI: 10.3390/molecules191117279 ;PMID: 25353381

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Title:
Radical intermediates in photoinduced reactions on TiO2 (an EPR spin trapping study)
Author: Dvoranova, Dana ; Barbierikova, Zuzana ; Brezova, Vlasta
Subjects: Acetonitriles - chemistry ; Carbon - chemistry ; Dimethyl Sulfoxide - chemistry ; Electrons ; EPR spectroscopy ; Ethanol - chemistry ; Ethyl alcohol ; hydroxyl radical ; Hydroxyl Radical - chemistry ; Hydroxyl radicals ; Irradiation ; Methanol - chemistry ; Methyl alcohol ; Oxides - chemistry ; Oxygen - chemistry ; Radicals ; reactive oxygen species ; Solubility ; Solvents ; Solvents - chemistry ; Spin Trapping - methods ; spin trapping technique ; sterically hindered amines ; Superoxides - chemistry ; Titanium - chemistry ; Titanium dioxide ; Trapping
Is Part Of: Molecules (Basel, Switzerland), 2014-10, Vol.19 (11), p.17279-17304
Description: The radical intermediates formed upon UVA irradiation of titanium dioxide suspensions in aqueous and non-aqueous environments were investigated applying the EPR spin trapping technique. The results showed that the generation of reactive species and their consecutive reactions are influenced by the solvent properties (e.g., polarity, solubility of molecular oxygen, rate constant for the reaction of hydroxyl radicals with the solvent). The formation of hydroxyl radicals, evidenced as the corresponding spin-adducts, dominated in the irradiated TiO2 aqueous suspensions. The addition of 17O-enriched water caused changes in the EPR spectra reflecting the interaction of an unpaired electron with the 17O nucleus. The photoexcitation of TiO2 in non-aqueous solvents (dimethylsulfoxide, acetonitrile, methanol and ethanol) in the presence of 5,5-dimethyl-1-pyrroline N-oxide spin trap displayed a stabilization of the superoxide radical anions generated via electron transfer reaction to molecular oxygen, and various oxygen- and carbon-centered radicals from the solvents were generated. The character and origin of the carbon-centered spin-adducts was confirmed using nitroso spin trapping agents.
Publisher: Switzerland: MDPI AG
Language: English
Identifier: ISSN: 1420-3049
EISSN: 1420-3049
DOI: 10.3390/molecules191117279
PMID: 25353381
Source: AUTh Library subscriptions: ProQuest Central
GFMER Free Medical Journals
MEDLINE
PubMed Central
Alma/SFX Local Collection
DOAJ Directory of Open Access Journals

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Radical intermediates in photoinduced reactions on TiO2 (an EPR spin trapping study)

Copyright MDPI AG 2014 ;2014 by the authors. 2014 ;ISSN: 1420-3049 ;EISSN: 1420-3049 ;DOI: 10.3390/molecules191117279 ;PMID: 25353381

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