Vibrational spectra and structures of some dicyanoaurate(I) complexes

Transformative Binding and Release of Gold Guests from a Self‐Assembled Cu8L4 Tube

“…[18] When a 1:1 stoichiometry of KAu(CN) 2 :1 was employed, the Cu I required to generate the Cu(Au(CN) 2 ) 2 À guest was obtained through decomposition of a portion of the host molecules present. This partial host consumption was indicated by the appearance of free 6-methyl-2-formylpyridine, which was observed by 1 H NMR in proportion to the amount of 2 produced, together with 2, 1-D 4 , and 1-D 2d in solution ( Figure S22).…”

“…This observation suggests that the linear binding pocket of 1-D 4 served as a protective cover for the complex Cu(Au(CN) 2 ) 2 À anion, suppressing the formation of cyanide-bridged insoluble polymeric and oligomeric species. [18,19] In seeking thermodynamic equilibrium, this host-guest system may thus be observed not only to stabilize an otherwise inaccessible guest, [9] but to generate an optimal guest from amongst the different possibilities latent in the system, although this guest has no observed independent existence.…”

Ion Exchange Resins for Gold Cyanide Extraction Containing a Piperazine Functionality, 2. Study of the Gold Extraction Reaction

“…[41] Simple salts of Au(CN) 2 -show a large shift for the CN stretch. [42] These results suggest that the CN stretch in the IR spectrum is far from being conclusive evidence for the existence of Au(CN) 2 -and for providing a definite description of the chemical absorption reactions pertinent to the behavior of PS-PIP resin in the basic range.…”

“…The relative areas of the N(1s) peaks of the different samples are collected and shown in Table 3. Salts KAu(CN) 2 (s) 2 140, [37] 2 141, [29] 2 145 [31] HAu(CN) 2 (s) 2 212, [37] 2 146 [29] AuCN(s) polymeric 2 261, [37] 2 239 [29] LAuCN (L = Ph 3 P) 2 138 [41] LAuCN (L = Et 3 P) 2 145 [42] Aqueous Solutions K + Au(CN) 2 -2 142 [37] H + Au(CN) 2 -2 147 [37] Ion Exchange Resins PS-PIP + Au(CN) 2 - [50] Organic Solvents Tridecylamine/xylene + Au(CN) 2 -2 140 [34] Adogen 283/TBP/CCl 4 + Au(CN) 2 -(pH = 8.0) Figure 5 shows the Au(4f) and N(1s) photoelectron binding energies for the loaded resins at various pH solutions. The Au(4f 7/2 ) BE value for gold adsorbed on the PS-PIP resin is 85.1 l 0.1 eV.…”

Transformative Binding and Release of Gold Guests from a Self‐Assembled Cu8L4 Tube

“…Mass spectra indicated that the dicyanoaurate adduct of 1 was not a simple 1:1 complex, however, but rather that the guest species was the complex anion Cu(Au(CN) 2 ) 2 − , leading to the formulation of 2 as [Cu(Au(CN) 2 ) 2 ⊂ 1 ‐ D 4 ] 7+ (Figure 3). The presence of bridging cyanides was confirmed by the observation of two CN resonances in the infrared spectrum (2144 and 2190 cm −1 ) at higher wavenumbers than free dicyanoaurate (2142 cm −1 ) 18…”