The first salt of an isolated pentachloroplumbate(II) trianion

Abstract

The title compound, tris(cyclo­hexane-1,2-diamine-κ2N,N′)cobalt penta­chloro­plum­bate sesquihydrate, [Co(C6H14N2)3][PbCl5]·1.5H2O, crystallizes in the monoclinic space group C2/c, with a tricationic cobalt complex, a penta­chloro­plumbate trianion, one water mol­ecule in a general position and a second water mol­ecule on a crystallographic twofold axis. The compound is the first example of an isolated [PbCl5]3− moiety; the Pb atom is coordinated in a square-pyramidal fashion, with four longer bonds to Cl atoms in the basal plane and a shorter distance to the apex. The ionic constituents and the solvent mol­ecules form a three-dimensional network of hydrogen bonds.