HgI2 MERCURIC IODIDE

HgI2 MERCURIC IODIDE 56.286 3.4249E-01 -8.7036E-04 1.0951E-06 -5.3193E-10 298 563 solid... 

Di-iodo-diethylenediamino -chromic Salts are derived from di-iodo-diethylenediamino-ehromiciodide mercuric iodide, [Cr en2I2]I.HgI2, which is prepared by decomposing bromo-bisaquo-salts with hydriodic acid and mercuric iodide. It crystallises in very green leaflets, and is almost insoluble in water. The double salt is decomposed by hydrogen sulphide. The iodide is unstable, and in solution very readily decomposes.3... 

Fig. 2. The effect of lithium perchlorate on the molar activity coefficients of reactants and transition states in the bimolecular substitution of tetraalkyltins by mercuric iodide in solvent 96 % methanol-4 % water. LiC104 = LiC104 (estimated) But = Bu 4Sn/HgI2 transition state Prt = Pr"4Sn/HgI2 transition state Ett = Et4Sn/HgI2 transition state Et = Et4Sn Hg = Hgl2 b = Pr"4Sn a = Bu"4Sn (IX)t — transition state (IX), see text.

The reaction of mercuric iodide with the chelating diphosphine bis(diphenyl-phosphinoethyl)sulphide gives the complex [(Ph2PC2H4)2S]HgI2.184 Structural analysis shows the mercury to be in a distorted tetrahedral co-ordination, with formation of an eight-membered puckered chelate ring. 

---