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Lead Iodide Complex Salts

Lead iodide combines with hydriodic acid to form a crystalline compound, and with a large number of metallic iodides to form double salts.

The compound HI.PbI2.5H2O is obtained in unstable crystals by the action of hydriodic acid on lead in presence of air, or by dissolving lead iodide in hydriodic acid; and the following double iodides have been described: PbI2.2LiI.4H2O, PbI2.LiI.5H2O, PbI2.4NaI, PbI2.2NaI.4H2O, PbI2.2NaI.6H2O, PbI2.KI.2H2O (other potassium salts have been described, but their existence is doubtful), 3PbI2.4NH4I.6H2O, 3PbI2.4N(CH3)4I, PbI2.RbI.2H2O, PbI2.CsI; also double iodides containing the following elements: Mg, Ca, Sr, Ba, Zn, Cd, Sn, Cr, Fe, Mn, Ni, Co, Al, P, As, Sb, Bi. The pyridine compounds PbI2.2C5H5N and PbI2.3C5H5N have been prepared.

The following chloriodides PbI2.PbCl2 or PbICl and 3PbICl.H2O, and the bromiodide PbI2.3PbBr2 are said to exist, but it is questionable whether they are true compounds or isomorphous mixtures of the different halides.

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