Synthesis and NMR spectroscopic investigation of salts containing the novel [Au(CF3)nX4−n]− (n=4–1, X=F, CN, Cl) anions

Hydrolytic Decomposition of Tetramethylammonium Bis(trifluoromethyl)aurate(I), [NMe4][Au(CF3)2]: A Route for the Synthesis of Gold Nanoparticles in Aqueous Medium

“…The decomposition products were identified to be CO 2 [precipitation of BaCO 3 upon bubbling the gas through a Ba(OH) 2 19 F NMR spectra (δ = -21.0 ppm) and a quartet in the 13 C NMR (δ = 145 ppm) spectra, assignable to AuCF 3 ·CD 3 CN or possibly AuCF 3 ·H 2 O, although the formation of the latter appears to be unlikely. After a period of 5 d, a third signal that corresponded to trifluoromethylgold derivative was observed in the 19 F and 13 C NMR spectra, which upon comparison with published NMR spectroscopic data [24] suggested the formation of a mono(trifluoromethyl)gold(III) compound that was not characterised further. The formation of a formal Au II species with an Au-Au bond also cannot be excluded at this stage.…”

“…Quartets and septets in the 19 F NMR spectra Ϫ although of very low intensity Ϫ indicated tris(trifluoromethyl)gold(III) species of so far unknown composition. [24] The 13 An unexpected aurate(I), 1,1,1,4,5,5,5-heptafluoro-2,4-bis(trifluoromethyl)pent-2-ene-3-(trifluoromethyl)aurate(I) (Scheme 2), was identified with the help of correlated spectroscopy ( 19 F, 19 F and 19 F, 13 C), when a larger excess amount (Ͼ20 %) of Me 3 SiCF 3 was used, thus implying a similar reaction sequence as investigated for the formation of the 1,1,1,4,5,5,5-heptafluoro-2,4-bis(trifluoromethyl)pentide ion [25] in fluoride-mediated reactions of Me 3 SiCF 3 with itself. [28] Within the accessible range, the compound exhibited two irreversible oxidation waves at +0.73 and +1.05 V, which were tentatively assigned to Au I /Au II and Au II /Au III couples, respectively.…”

Stabilization of Lewis Acidic AuF3 as an N‐Heterocyclic Carbene Complex: Preparation and Characterization of [AuF3(SIMes)]

“…[16,18,[20][21][22][23] In the present work, two synthetic approaches towards af luoridoorganogold(III) carbene complex containing the Au III F 3 unit are reported. [16,18,[20][21][22][23] In the present work, two synthetic approaches towards af luoridoorganogold(III) carbene complex containing the Au III F 3 unit are reported.…”

“…The 19 FNMR spectrum ( Figure 2) shows at riplet at d = À217 ppm for af luorine atom (F X )i nt he trans position to the NHC ligand. [18,22,27] ]. [16,17,19,21,22] The 2 J( 19 F, 19 F) coupling constant amounts to 49 Hz, consistent with 2 J-( 19 F, 19 F) cis couplings in gold complexes,w hich are in the range of 20-85 Hz.…”

An Organogold(III) Difluoride with a trans Arrangement

“…Thus,whereas ah andful of difluorides with formula cis-(NHC)RAuF 2 (R = alkyl) were detected in solution, [6] only the compounds cis-(N^C)AuF 2 were actually isolated. [9] This difluoride is of especial interest not only because of its singular geometry among organogold fluorides but also because it is exactly midway between the all organometallic [10] [(CF 3 ) 4 Au] À and the purely inorganic [11] [AuF 4 ] À derivatives,p robably combining the stability of the former with the reactivity of the latter. [9] This difluoride is of especial interest not only because of its singular geometry among organogold fluorides but also because it is exactly midway between the all organometallic [10] [(CF 3 ) 4 Au] À and the purely inorganic [11] [AuF 4 ] À derivatives,p robably combining the stability of the former with the reactivity of the latter.…”