Lewis-base adducts of Group 1B metal(I) compounds. Part 4. Synthesis and crystal structure of the 1 : 1 adduct of silver(I) chloride with quinoline

Abstract

The crystal structure of the title compound, [{[AgCl(C₉H₇N)]·0.25C₉H₇N}_n], has been determined by single-crystal X-ray diffraction methods at 295(1) K. Crystals are monoclinic, space-group C2/c, with a= 30.508(5), b= 7.216(1), c= 22.698(5)Å, and β= 122.11(7)°; the structure was refined by least-squares methods to a residual R of 0.042 for 1 258 independent ‘observed’ reflections. The structure is novel in the context of Group 1B metal(I)–halide–base adducts, and is a polymer, comprising Ag₅X₄face-centred motifs linked in a linear polymeric array through the silver atoms at opposite corners of the face; the two vacant co-ordination sites at the other corners each accommodate a pair of quinoline ligands. The silver atom at the centre of the motif is pseudo-tetrahedrally co-ordinated by the four halogen atoms, so that the Ag₅X₄ unit adopts a ‘saddle’ conformation. The bromide derivative is isomorphous, with a= 30.57(2), b= 7.319(4), c= 23.17(2)Å, and β= 122.19(5)°.