Gold Compounds as Ionic Liquids. Synthesis, Structures, and Thermal Properties ofN,N‘-Dialkylimidazolium Tetrachloroaurate Salts

Abstract

The salts [C6H11N2][AuCl4] (1) and [C8H15N2][AuCl4] (2) ([C6H11N2]+ = 1-ethyl-3-methylimidazolium; [C8H15N2]+ = 1-butyl-3-methylimidazolium), prepared by a solvent-free method, display similar crystal structures. 1 crystallizes in the monoclinic P21/c space group (a = 11.1915(15) Å, b = 12.380(2) Å, c = 9.2883(13) Å; β = 98.810(16)°; Z = 4) and 2 in the triclinic P1̄ space group (a = 7.9354(14) Å, b = 8.3930(15) Å, c = 11.397(2) Å; α = 83.94(2)°, β = 87.93(2)°, γ = 78.04(2)°; Z = 2). In both cases, a unique motif is seen consisting of linear chains of alternating corner-to-face arranged [AuCl4]- ions at Au···Cl separations of 3.356(3) Å (1) and 3.452(3) Å (2). Ionic liquid behavior is observed from 58 to 220 °C for 1 and 50 to 250 °C for 2.

A Simple Primary Amide for the Selective Recovery of Gold from Secondary Resources

“…The chlorine-phase-shift-corrected FT-EXAFS shows one intense peak at 2.28 Å attributed to the chloride neighbours. The position and symmetry of this peak is consistent with a homoleptic AuCl4 − anion, [15] suggesting that the ligand-metal interaction in solution is indeed outer-sphere. The broad peak at 4.1 -4.9 Å is most likely produced by multiple scattering from this dominant Au-Cl correlation.…”

Property variation of ionic liquid [Bmim][AuCl4] immobilized on carboxylated polystyrene submicrospheres with a small surface area

“…[Bmim][AuCl 4 ] was synthesized according to a method previously described in the literature [11]. A slight excess of [Bmim]Cl (0.13 g, 0.74 mmol) was added to tetrachloroauric acid (HAuCl 4 ·4H 2 O, 0.275 g, 0.67 mmol) to instantly form a soft yellow solid.…”

Lithium Chloride-Imidazolium Chloride Melts for the Coupling Reactions of Propylene Oxide and CO2

“…18 Propylene oxide (PO), imidazole, 1-methylimidazole, 1,2-dimethylimidazole, and LiCl were purchased from Aldrich Chemical Co. and used without further purification. CO 2 [19][20][21] Fourier Transform Infrared (FT-IR) spectra were recorded on a Nicolet 380 spectrophotometer (Thermo Electron Co.). To avoid contact with water and air, FT-IR measurements were performed using a specially designed IR cell equipped with two KRS-5 windows.…”