TetraChloroaurate , potassium

Again, the authors tested some variations of the metal catalyst the entries with the copper triad metals are listed in Table 12.8. Copper(I) iodide was inactive (entry 1), silver tetrafluoroborate and AUCI3 both delivered the allene without cycloisomerization within 24 h (entries 2 and 4), and potassium tetrachloroaurate was inactive (entry 3). Without activation, phosphanegold(I) chlorides were inactive (entry 5), but after removal of the chloro ligand by silver salts, excellent yields were obtained in short reaction times of 40 min (entries 6-8). 

Assemble the two-necked, round-bottomed 250 mL flask, the heating jacket and the stirrer. Dissolve the porphyrin (0.31 g) in 100 mL of acetic acid. Add potassium tetrachloroaurate (0.236 g) and sodium acetate (0.079 g). Introduce the stirring bar, assemble the condenser and stopper the remaining opening of the flask with a septum. 

Potassium tetrachloroaurate dihydrate KAuCl3-2H30 13682-61-6 413.908 yel monoci cry s H,0, EtOH, eth... 

The ligand iso-maleonitriledithiolate was synthesized as the potassium salt, according to the procedure of Gomper and Topel [9]. Its gold complex was obtained by the reaction of potassium tetrachloroaurate with K2(i-mnt)2 in die presence of tetra-n-butylammonium bromide [10]. 

Figure 11.2 Normalized Au L3 edge XANES spectra of gold particles deposited on Ti02 and AI2O3. The reference includes gold foil and powder of potassium tetrachloroaurate(III) hydrate. 2003 John Wiley Sons, Ltd.

KAuCU potassium tetrachloroaurate a[PHO 2P] sodium fluorohydridodioxophosphate HPPe hydrogen hexafluorophosphate... 

Figure 12.2 UV-visible spectra of gold nanoparticles formed in solution through the reaction of potassium tetrachloroaurate with oat and wheat biomasses at pH 4.

Figure 12.3 (a) X-ray diffraction of gold nanoparticles synthesized on an oat biomass using 3.0 mM aqueous potassium tetrachloroaurate solution and a temperature of 100°C showing the 111, 220 and 200... 

Figure 12.4 (a) Dark-field and (b) conventional HRTEM Images of gold nanoparticles synthesized through the reduction of potassium tetrachloroaurate using an oat biomass. Compared to the... 

Figure 12.5 Gold Lm XANES region from 11.85-12.05 keV of a bulk Au(0) model compound, a potassium tetrachloroaurate model compound, and a potassium tetrachloroaurate reacted with an oat biomass at pH 4.

Figure 12.6 shows the Fourier-transformed EXAFS spectrum of potassium tetrachloroaurate reacted with wheat biomass and amine resin, the Au(0) foil and a potassium tetrachloroaurate model compound. Similar to results obtained for the reduction of Cr(Vl) on agave biomass, the reduction of potassium tetrachloroaurate on wheat biomass (Figure 12.6a) or on an amine resin (Figure 12.6b) at pH... 

Figure 12.6 (a) Fourier-transformed gold tm EXAFS of the reaction of potassium tetrachloroaurate with a wheat biomass at pH 3, showing the presence of chlorine ligands and gold-gold interactions (b) Fourier-transformed gold till EXAFS of the reaction of potassium tetrachloroaurate with an amine... 

Figu re 12.10 HRTEM image of an irregularly shaped gold nanoparticle formed by the reduction of potassium tetrachloroaurate with a hops biomass, resulting in a tadpole -like shape. 

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