At point B, the cell was closed and put under argon bubbling. As soon as the soluble metal precursor was introduced, a sharp selleck chemicals llc increase of potential is observed, suggesting that the reaction quickly reaches completion. When an excess of soluble metal precursor with respect to
FeII is added (stoichiometry ratio R > 100%), the potential stabilizes at a value that is consistent with AuIII/Au or AgI/Ag redox systems, AuCl4 −/Au (E° = 1.00 V/ESH) for curve a and Ag(NH3)2 +/Ag (E° = 0.37 V/ESH) for curve c. Otherwise (R < 100%), the lower potential values beyond Selleck PI3K Inhibitor Library point B in curves b and d are related to FeII and FeIII species. In this case, after removing the solid sample from the solution, the contact with air provokes the oxidation of the remaining green rust. Figure 1 Potential-time transients. Synthesis of green rust suspension from point A to point B and its further reaction with the soluble metal precursor which is added at point B at various stoichiometric ratios R; sulfate green rust and AuIII, (a) R = 120% and (b) R = 25%; carbonate green rust and AgI (c) R = 120% and (d) R = 15. The FTIR spectra of the solid samples obtained after the reaction of carbonate green rust with AgI or AuIII are similar and exhibit bands corresponding
to exGRc-Fe(III), the ferric product resulting from the solid-state oxidation of carbonate green rust (spectra a and b in Figure 2) . A similar solid-state oxidation leading Daporinad datasheet to exGRs-Fe(III) also occurs when using sulfate green rust. No other characteristic bands are obviously observed, suggesting the absence of any other iron compounds. Figure 2 FTIR spectra of the solid samples. Solid samples obtained after reaction between (a) GRc and AgI, R = 100%, (b) GRc and AuIII, R = 200%, and (c) GRs and AuIII, R = 150%. The ferric product
exGRc-Fe(III) resulting from the solid-state oxidation of carbonate green rust exhibits bands at 450, 695, and 850 (sh), 1,065, 1,485, and 1,530 (sh), and 1,640, 3,200 and 3,430 cm−1.The ferric product exGRs-Fe(III) resulting from the solid-state oxidation of sulfate green Flucloronide rust exhibits bands at 450, 605, 700, 980, 1,055, 1,120, and 1,200 (sh), and 1,640, 3,220 and 3,420 cm−1. Figure 3 gives the XRD patterns of the solid samples resulting from the interaction between AuIII/GRc (curve a), AuIII/GRs (curve b), and AgI/GRs (curve c). In the XRD patterns of the solid samples, the formation of Au metal or Ag metal is evidenced by their (111) and (200) lines with 2θ values at 38.2° and 44.4 or 38.1° and 44.2°. The size s of X-ray coherent domains was determined from the two diffraction lines according to the simplified Scherrer equation (Equation 1) with the value of 20 to 14 nm for AuIII/GRc, 18 to 12 nm for AuIII/GRs, and 14 to 10 nm for AgI/GRs: (1) where s is the size of X-ray coherent domains (nm); B, the angular width at half-height (rad); θ, the Bragg’s law diffraction angle; and λ, the X-ray wavelength (nm).