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Chemical methylation of germanium(II) in model aqueous solutions

✍ Scribed by H P Mayer; S Rapsomanikis

Publisher
John Wiley and Sons
Year
1992
Tongue
English
Weight
498 KB
Volume
6
Category
Article
ISSN
0268-2605

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✦ Synopsis

Inorganic germanium(I1) in micromolar concentrations was reacted with methyl iodide (CH3J) and methylcobalamin (CHJ-CoB,,) at various pH values and with different salt matrices. In all experiments monomethylgermanium was the only product. The reaction with CH,-CoB,, at pH1 yielded approximately 1.3% of the added germanium, whereas no methylation occurred at pH 7. Reaction yields with CHJ were lowest at pH 1 in 0.1 mol dm-3 KCI (1.6%) and highest at pH 7.6 in artificial seawater (6%). For the reaction of CH3-CoB,, with germanium(I1) a free-radical mechanism is assumed, whereas methylation by CH31 is most likely an oxidative addition mechanism.

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