Lead Sulphohalides

The following sulphohalides of lead are known: PbS.PbCl₂, PbS.4PbCl₂, PbS.PbBr₂, PbS.4PbBr₂, PbS.4PbI₂. No sulphofluoride is known.

Lead Sulphochlorides - It is well known that when hydrogen sulphide gas is passed into a solution of a lead salt containing much hydrochloric acid a dark red precipitate is obtained, which turns black if the solution is diluted and hydrogen sulphide is again passed into it. This red compound is a lead sulphochloride which was originally supposed to be 3PbS.2PbCl₂, but is very probably PbS.PbCl₂. Another sulphochloride, having the composition PbS.4PbCl₂, is obtained by diluting a solution of lead sulphide in concentrated hydrochloric acid.

Lead Sulphobromides - PbS.PbBr₂ and PbS.4PbBr₂ can be prepared quite similarly to the corresponding sulphochlorides.

Lead Sulphoiodide PbS.4PbI₂, may be obtained either by diluting a solution of lead sulphide in concentrated hydriodic acid, or by adding an aqueous solution of hydrogen sulphide to a solution of lead iodide in the same acid, or in concentrated potassium iodide solution.

Lead chlorothiobismuthite, PbS.Bi₂S₃.2BiSCl, and the corresponding bromo- and iodo-compounds have been prepared by Ducatte.