The Unique bis-(Disulfato)-aurate Anion [Au(S2O7)2]−: Synthesis and Characterization of Li[Au(S2O7)2] and Na[Au(S2O7)2]
- 29 September 2011
- journal article
- research article
- Published by American Chemical Society (ACS) in Inorganic Chemistry
- Vol. 50 (21) , 11111-11116
Abstract
The reaction of Au(OH)(3) and oleum (65% SO(3)) in the presence of M(2)SO(4) (M = Li, Na) afforded yellow single crystals of Li[Au(S(2)O(7))(2)] (triclinic, P ̅1, Z = 1, a = 532.20(3), b = 649.69(4), c = 836.72(5) pm, α = 107.982(2)°, β = 90.171(2)°, γ = 102.583(2)°, V = 267.80(3) Å(3)) and Na[Au(S(2)O(7))(2)] (monoclinic, P2(1)/n, Z = 2, a = 533.31(3), b = 1193.38(7), c = 907.67(5) pm, β = 98.548(3)°, V = 571.26(6) Å(3)). Both compounds exhibit the unprecedented [Au(S(2)O(7))(2)](-) anion in which a square planar coordination of the central gold atom is achieved by the chelating attachment of two disulfate groups. The disulfates were characterized by means of IR spectroscopy and DTA/TG measurements. For both compounds, the decomposition occurs via several steps and is finished at about 450 °C at the stage of elemental gold and the sulfates M(2)SO(4) (M = Li, Na), as revealed by X-ray powder diffraction of the residues.Keywords
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