Data di Pubblicazione:
2013
Citazione:
Gold oxidative dissolution by (thioamide)–I2 adducts / F. Isaia, M.C. Aragoni, M. Arca, C. Caltagirone, F. Demartin, A. Garau, V. Lippolis. - In: DALTON TRANSACTIONS. - ISSN 1477-9226. - 42:2(2013), pp. 492-498. [10.1039/C2DT31855E]
Abstract:
Elemental gold powder is easily oxidised under mild reaction conditions with 1 : 1 I2-adducts of the thioamides
3-methyl-benzothiazole-2-thione (mbtt) and 1-methyl-1H-benzimidazole-2(3H)-thione (mbit)
with separation of the ionic complexes [AuI(mbtt)2]I3 (1) and [(mtbiH)2](AuI4)I3 (2) [mtbiH = the imido
protonated form of 2-(methylthio)benzimidazole] (gold oxidation yield >78% and 45%, respectively).
The X-ray crystal structure of 1 shows the Au(I) centre linearly bound by two neutral ligands via the
sulphur atom, whereas the X-ray crystal structure of 2 shows the Au(III) centre surrounded by four iodides
in a square-planar arrangement. The oxidising/complexing properties of the mbtt·I2 and mbit·I2 adducts
were interpreted considering the S-donor to I2 interaction that leads to a charge separation between the
Ib and It iodine atoms in the fragment S–Ib–It. The oxidation of gold in a non-aqueous solvent by thioamide–
I2 adducts could be a promising alternative process to the numerous hydrometallurgical ones for
the recovery of gold from secondary sources.
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
F. Isaia, M.C. Aragoni, M. Arca, C. Caltagirone, F. Demartin, A. Garau, V. Lippolis
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