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Title

Photostabilization of the herbicide norflurazon by using organoclays

AuthorsUndabeytia López, Tomás ; Tel-Or, E.; Rubin, Baruch; Nir, Shlomo
Issue Date2000
PublisherAmerican Chemical Society
CitationJournal of Agricultural and Food Chemistry 48(10): 4774-4779 (2000)
AbstractPhotostable formulations of the herbicide norflurazon [4-chloro-5-(methylamino)-2-(R,R,R-trifluorom-tolyl)pyridazin-3-(2H)-one] were achieved by adsorbing it on pillared clay or on montmorillonite preadsorbed with the organic cation thioflavin T (TFT). Diffuse reflectance Fourier transform infrared spectra showed the existence of strong interactions between the aromatic moieties of preadsorbed TFT and the herbicide, particularly after irradiation. The photostabilization of norflurazon obtained with TFT-clay was mainly due to energy transfer from the herbicide to the organic cation via ð-ð* interactions. An additional mechanism is the lower production of radicals from the clay when the clay mineral surface is covered with the organic cation. These radicals are responsible for the enhanced photodegradation observed when norflurazon was irradiated in the presence of untreated montmorillonite.
URIhttp://hdl.handle.net/10261/65021
DOI10.1021/jf9912405
Identifiersdoi: 10.1021/jf9912405
issn: 0021-8561
e-issn: 1520-5118
Appears in Collections:(IRNAS) Artículos
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