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- W2071145120 abstract "Abstract The chemical reaction between diffusing nitrite and an iron-substituted Keggin-type heteropolytungstate [(H 2 O)Fe II PW 11 O 39 ] 5− , immobilized in a poly( N -methylpyrrole) film, generates a nitrosyl complex spectrophotometrically revealed around 465 nm. The analysis of transient absorption data from a theoretical model developed by Bartleu and Gardner ( Philos. Trans. R. Soc. London, Sci: A, 354 (1996) 35) demonstrates that the rate-determining step of the chemical process is the reaction kinetics rather than the nitrite diffusion throughout the film when a relatively thin film (≈0.10 μm, Γ [(H 2 O)Fe III ] = 1.0×10 −8 mol cm −2 ) is investigated in the presence of 30 mM nitrite. Moreover, the conversion into nitrosyl complex is expected to be total. The representation of the maximum absorbance in the ln( A (∞) - A ( t )) t form gives a linear plot, and the rate constant extracted from the slope is 0.4 M −1 s −1 . The spectrophotometric response of the nitrosyl complex is also predicted when Γ 0 [(H 2 O)Fe III ] 0 and C NO 2− 0 are varied. For Γ [(H 2 O)Fe III ] 0 contained in the range of 0.4 5 × 10 −8 to 3.3 5 × 10 −8 mol cm −2 , a similar limiting case with a linear In( A (∞) - A ( t )) - t plot would be expected. For much larger Γ 0 [(H 2 O)Fe III ] 0 values, the kinetics of the chemical reaction would be controlled by the diffusion of nitrite throughout the film and the expected transient A ( t ) / A (∞) profiles would be dependent on the nitrite concentration." @default.
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- W2071145120 date "1997-08-01" @default.
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- W2071145120 title "Analysis of the spectrophotometric response of a nitrosyl complex generated within an electronic conducting polymer film" @default.
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- W2071145120 doi "https://doi.org/10.1016/s0379-6779(98)80113-6" @default.
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