Crystal structures of five halido gold complexes involving piperidine or pyrrolidine as ligands or (protonated) as cations

In bromido(pyrrolidine- κ N)gold(I) bis(pyrrolidine- κ N)gold(I) bromide, [AuBr(pyr)] · [Au(pyr)2]Br (pyr = pyrrolidine, C4H9N), 2, alternating [AuBr(pyr)] molecules and [Au(pyr)2]+ cations are connected by aurophilic contacts to form infinite chains of residues parallel to the b axis. The chains are cross-linked by three N — H...Br − hydrogen bonds and an Au...Br contact to form a layer structure parallel to the ab plane. Trichlorido(piperidine- κ N)gold(III), [AuCl3(pip)] (pip = piperidine, C5H11N), 3, consists of molecules with the expected square-planar coordination at the gold atom, which are connected by an N — H...Cl hydrogen bond and an Au...Cl contact to form a layer structure parallel to the ac plane. The structures of bis(piperidinium) tetrachloridoaurate(III) chloride, (pipH)2[AuCl4]Cl, 4, and bis(pyrrolidinium) tetrabromidoaurate(III) bromide, (pyrH)2[AuBr4]Br, 6, are closely related but not isotypic. Compound 6 crystallizes in space group Ibam; the Au and two Br atoms of the anion lie in the mirror plane x, y, 0, whereas the bromide ions occupy special positions 0, 0.5, 0 and 0, 0.5, 0.25, with site symmetry 2/m. The NH2 group forms a hydrogen bond to one bromide ion, and also a three-centre hydrogen bond to the other bromide atom and to a metal-bonded Br atom. The packing involves chains of hydrogen-bonded pyrrolidinium and bromide ions parallel to the c axis, combined with a layer structure of [AuBr4] − and bromide anions, parallel to the ab plane ...

Source: Acta Crystallographica Section E - October 10, 2023 Category: Chemistry Authors: D ö ring, C. Jones, P.G. Tags: crystal structure gold piperidine pyrrolidine secondary interactions research communications Source Type: research