Fig. 2: Structural characterisation of precipitates by X-ray crystallography.
From: Tuneable separation of gold by selective precipitation using a simple and recyclable diamide
For clarity, all hydrogens except those involved in hydrogen bonding are omitted (displacement ellipsoids are drawn at 50% probability). Atom colours: red = O; cyan = N; grey = C; green = Cl; yellow = Au, pale grey = Pt, dark blue = Co; white = H. a X-ray crystal structure of [HL][AuCl4] showing the intermolecular proton-chelate structure and the arrangement of AuCl4− within the rhombohedral clefts derived from the phenyl and methyl substituents of the infinite chain of protonated diamides, C(H)—Cl(Au) 3.43–3.97 Å; N1-C3-C3′-N1′ 54.9(3)°. b X-ray crystal structure of [HL]2[PtCl6](H2O) showing the arrangement of PtCl62− and a molecule of water within the intermolecular proton-chelated structure. For clarity, only one of the two [HL] cations is shown. c X-ray crystal structure of [HL][H3O(H2O)2][CoCl4] showing the intermolecular proton-chelate structure and the layered arrangement of CoCl42− and H3O+ water cluster between the infinite ribbon chain of protonated diamides.
