Condensation cascades and methylgroup transfer reactions during the formation of arsane, methyl- and dimethylarsane by aqueous borohydride and (methyl) arsenates

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DOIResolve DOI: http://doi.org/10.1007/s00216-011-5503-4
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TypeArticle
Journal titleAnalytical and Bioanalytical Chemistry
ISSN1618-2642
1618-2650
Volume402
Issue2
Pages921933; # of pages: 13
Subjectarsenic; monomethyarsonic acid; dimethylarsinic acid; tetrahydridoborate; diarsanes; triarsanes
AbstractThe formation of volatile products during the reaction of As(iii), As(v), MeAsO(OH)2, and Me2AsO(OH) with aqueous NaBH4 has been investigated, and the formation of arsanes, diarsanes, and triarsanes has been detected. The presence of triarsanes is reported here for the first time. Diarsanes and triarsanes are likely formed in condensation cascade reactions, whereas trimethylarsane arises via the transfer of a methyl group. The formation of volatile by-products is considerably reduced by increasing the acidity of the medium and the concentration of NaBH4 or by the addition of thiols, such as cysteine. A reaction scheme is proposed which reconciles the evidence reported herein and elsewhere in the literature that is valid for both analytical (trace analysis) and non-analytical reaction conditions.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Institute for National Measurement Standards
Peer reviewedYes
Identifier5503
NPARC number21268282
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Record identifier906fc520-b4ee-4e69-9ab0-5defc7ccd1fe
Record created2013-06-13
Record modified2016-05-09
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