Mössbauer study of gold sorption on polyurethane foams

197Au Mössbauer Characterization of the Noncovalent Adducts Formed between Serum Albumin and Dicyanoaurate(I), a Gold-Drug Metabolite

“…The IS and QS values observed for the two adducts (Table ) do not differ significantly, but are larger by about 0.5 mm s -1 than the corresponding values for crystalline K[Au(CN) 2 ] . Compared to the IS and QS values for Au(I) complexed to other ligands, − the values for the albumin adducts are so close to those for KAu(CN) 2 and other [Au(CN) 2 - ] salts and adducts − that they establish unambiguously that intact ions bind to albumin as essentially linear [NC−Au−CN] - entities. In fact, the IS and QS values observed for [Au(CN) 2 - ] salts as well as for the albumin adducts are among the largest observed for linear Au(I) complexes.…”

Solvation of gold and rare earths by tributyl phosphate

“…The linear N-C-Au-C-N molecule has negatively charged ends which are attracted to the hydronium ions as described above. One notable feature of Mössbauer spectra of the Au(CN) − 2 ion is that all crystalline or frozen solution samples produce a strong Gol'danskii-Karyagin effect [6], while samples adsorbed onto activated carbon or polyurethane foams do not [6,7]. This is because, in the former case, the bonding of the molecule is only at the negatively charged nitrogen ends, allowing the gold atom to vibrate more strongly perpendicular to the molecule.…”

“…Comparison of the parameters with those from the prior samples just described [6,7] and discussed in ref. [8], shows that the IS is the same as for crystalline KAu(CN) − 2 and smaller than that for the adsorbed species, implying that there is negligible bonding at the gold atom in agreement with the previous paragraph.…”