The crystal structure of gold(III) chloride

Abstract

Gold (III) chloride is monoclinic, in space group P21/c, with cell dimensions a = 6-57, b = 11-04, c = 6-44 A, and fl = 113-3 °. The atomic positions were determined by Patterson and electrondensity projections and were refined by Fourier and least-squares methods with three-dimensional data. The structure consists of plana molecules Au2C16 (at centers of symmetry) in which each Au has four C1 neighbors at 2-23 and 2.25 A (terminal C1) and 2.33 and 2-34 A (bridge C1), each + 0.02 A. Gold scattering factors in the least-squares refinement were modified for dispersion with little effect on coordinates but with appreciable effect on temperature and scale factors.

The crystal and molecular structure of gold tris(fluorosulfate)

“…The close approach to a square planar geometry is evident also from the relevant bond angles (Au-O,,, = 2.0 18 A). Similar, slightly larger discrepancies between distances to bridging and terminal halides are reported for the gold-halogen distances in the gold(LI1) halides, AuF3 (13), AuC13 (14), and AuBr3 (15).…”

“…As can be seen, gold(LI1) fluorosulfate is dimeric in the solid state, quite in contrast to polymeric AuF3 (13). On the other hand, there is a structural similarity to the other halides AuC13 (14) and AuBr3 (15), which are also both dimeric.…”

“…The structural chemistry of gold(II1) (18) provides a number of relevant examples, in addition to the binary halides, AuF3 (13), AuC13 (14), and AuBr3 (15) the structure is disordered. A sulfonate group bonded to Au(II1) is found in the organometallic compound (CH3)2A~(H20)-S03CF3 (23).…”

“…The presence of bidentate;' symmetrically bridging fluorosulfate groups widens the four-membered metallocycle, found for the two halides AuC13 and AuBr3 (14,15), to an eightmembered, centrosymmetric ring, which adopts a chair configuration. The two gold atoms are found in transannular positions with a cross ring distance of 4.5 lO(2) A, and are linked by two SO2 moieties from the bridging bidentate fluorosulfate groups.…”

Mössbauer study of quinquevalent gold compounds

“…;ing high precision in the determination of isomer shifts. It is usual for the Au(III) compound to be square or nearly-square coordinated [29] but other ligands approaching the [AuL 4 ] group always do so well off the axis normal to this plane. The usual situation is illustra- [30] ted by the crystal structure of KAuF 4 .…”