Iodine combines with chlorine to form iodine monochloride, IC1, which may be obtained by passing dry chlorine over dry iodine until the iodine is completely liquefied, or according to R.
It crystallizes in long yellow needles and decomposes readily on heating into the monochloride and chlorine.
Although hypoiodous acid is not known, it is extremely probable that on adding iodine or iodine monochloride to a dilute solution of a caustic alkali, hypoiodites are formed, the solution obtained having a characteristic smell of iodoform, and being of a pale yellow colour.
Thallic chloride, T1C1 3, is obtained by treating the monochloride with chlorine under water; evaporation in a vacuum gives colourless deliquescent crystals of T1C1,.H20.
In a hydrated form it is obtained by the reduction of vanadyl monochloride, Voci, with sodium amalgam, being precipitated from the liquid by the addition of ammonia (Locke and Edwards, Zeit.