ISSN:
0025-116X
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
The reduction of the emeraldine base form of polyaniline (PEM) by N,N-diethylhydroxylamine, sodium tetrahydroborate, sodium dithionite, and hydrazine monohydrate proceeds smoothly at room temperature to give the leucoemeraldine base form of polyaniline (PLM). The reduction of PEM to PLM with these reducing agents obeys a pseudo-first-order kinetics with respect to the concentration of PEM. The pseudo-first order rate constants, k, of the reduction with hydrazine monohydrate (5,0 · 10-1 mol · L-1), N,N-diethylhydroxylamine (6,2 · 10-2 mol · L-1), and NaBH4 (1,13 · 10-3 mol · L-1) are 1,46 · 10-4 S-1, and 2,50 · 10-4 s-1, and 1,7 · 10-3 s-1 at 20°C, respectively. In the case of sodium dithionite, which has a higher reducing ability, the reduction proceeds very rapidly at room temperature. Plot of In(k/[reductant]) against the electrochemically measured half-wave potential E1/2 affords a linear correlation with a slope of 20 V-1.
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/macp.1993.021941118
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