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Oxidation of (Au sup I (CN) sub 2 ) sup minus. Formation of dicyanogold(III) oxide and colloidal monocyanogold(III) oxide

Journal Article · · Journal of Physical Chemistry; (USA)
DOI:https://doi.org/10.1021/j100155a068· OSTI ID:5709168
 [1]
  1. Hahn-Meitner-Institut Berlin GmbH (West Germany)

(Au{sup I}(CN){sub 2}){sup {minus}} is oxidized by {sm bullet}OH radicals. The primary oxidation product is ((OH)Au{sup II}(CN){sub 2}){sup {minus}} which is in equilibrium with its protonated form: ((OH)Au{sup II}(CN){sub 2}){sup {minus}} + H{sup +} {rightleftharpoons} ((OH)Au{sup II}(CN){sub 2}){sup {minus}}H{sup +}. The protonated and the deprotonated oxidation products undergo disproportionation to give the Au{sup III} species which is also in equilibrium with a protonated form: ((OH){sub 2}Au{sup III}(CN){sub 2}){sup {minus}} + H{sup +} {rightleftharpoons} ((OH){sub 2}Au{sup III}(CN){sub 2}){sup {minus}}H{sup +}. In alkaline solution, the deprotonated Au{sup III} species loses a water molecule to give the stable negatively charged dicyanogold(III) oxide (O{double bond}Au{sup III}(CN){sub 2}){sup {minus}}. In acidic media, splitting of HCN is taking place to give O{double bond}Au(CN) which agglomerates rapidly into stable colloidal Au(III). The absorption spectra of the various intermediates and of colloidal Au(III) are reported.

OSTI ID:
5709168
Journal Information:
Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 95:2; ISSN JPCHA; ISSN 0022-3654
Country of Publication:
United States
Language:
English