Strukturen zweier Salze des Bis(thioharnstoff)gold(I)-Kations

Abstract

AbstractAttempts to isolate the compound (tu2Au)SCN1(tu=thiourea), first reported in 1949, at first led to [(tu)2Au]2SO4·CH3OH2after crystallization from methanol-petroleum ether. Crystallization from isopropanol led to the required compound1. The crystal structure analysis of1confirmed its ionic nature, (tu2Au)+SCN−. The tu ligands are mutuallytrans(torsion angle C–S···S–C 175.4(2)°), and the entire cation is approximately planar (r.m.s. deviation 0.08 Å). Eight classical hydrogen bonds connect the residues to form layers parallel to thebcplane atx≈⅛, ⅜, ⅝ and ⅞; the layers are connected by aurophilic contacts, which link the cations to form chains parallel to theaaxis. In the structure of compound2the S=C groups are synclinal to each other; two NH2groups are connected via a bifurcated hydrogen bonding system to a sulfate oxygen, forming a ring of graph setR21(10).${\rm{R}}_2^1(10).$In a complex three-dimensional packing, the cations are connected by various interactions to form layers parallel to theacplane aty≈½, whereas the sulfates are the centres of hydrogen-bonded double layers on both sides of the mirror plane aty≈¾. The structure contains a convincing example of a hydrogen bond to a gold centre.