ISSN:
0268-2605
Schlagwort(e):
Environment
;
organotin
;
methylation
;
methyltin
;
iodomethane
;
isotope tracer technique
;
kinetic
;
13C carbon
;
Chemistry
;
Organic Chemistry
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
The methylation of tin(II) [Sn(II)] by iodomethane (CH3I) under environmental conditions has been further demonstrated by a 13C carbon isotope tracer method. Methylation products are mainly monomethyltin, and very small amounts of dimethyltin. The reaction of Sn(II) and CH3I was investigated at pH 2, 4, 6, 8, 10 and salinity (S) 8, 15, 22, 28, 35%; it has been found the reaction was affected by pH and salinity, the tin methylation activity being highest at about pH 6 and S = 28% . The methylation reaction is first-order for both CH3I and Sn(II), and the rate equation has been obtained as follows: \documentclass{article}\pagestyle{empty}\begin{document}$$ \frac{{{\rm d}\left[{{\rm CH}_3 {\rm Sn}} \right]}}{{{\rm d}t}} = \left({k' + k''\left[{{\rm CH}_3 {\rm I}} \right]} \right)\left. {\left[{{\rm SnY}_2 } \right]} \right) $$\end{document} \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{*{20}c} {{\rm where}} \hfill & {k' = 9.10 \times 10^{ - 7} \min ^{ - 1},} \hfill \\ {} \hfill & {k'' = 1.11 \times 10^{ - 6}\; {\rm mmol}^{ - 1}\; {\rm dm}^3\; \min ^{ - 1},} \hfill \\ {} \hfill & {{\rm Y} = {\rm tin\;counterion}} \hfill \\ \end{array} $$\end{document}.
Zusätzliches Material:
5 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/aoc.590030112
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