Cobalt(II) chloride in vapor-phase co-reductions with other metal halides by hydrogen results in finely divided intermetallics with applications as structural materials or compounds with useful thermoelectric, magnetic, and oxidation-resistance properties.
Iron(II) chloride is used in the synthesis of iron complexes like iron(II) hydroxide. It acts as a precursor to hydrated iron(III) oxides that are magnetic pigments. It serves as a reducing agent in organic synthesis. Also, used as a reducing flocculating agent in wastewater treatment, especially for wastes containing chromate. It is used as an intermediate, in pigments, processing aids and in solids separation agents.
Lead(II) iodide is used as a detector material for high energy photons including x-rays and gamma rays. It is used in photography, printing, mosaic gold, and bronzing. It exhibits ferroelastic properties and has efficiency in stopping X-ray and gamma ray, which provides excellent environmental stability.
Tin(II) iodide is used to prepare organic-inorganic perovskite thin films which exhibit uniform surfaces and strong photoluminescence. It finds application as an analytical reagent in the determination of rhodium and iridium by spectrophotometry. It is also involved in the synthesis of CH3(CH2)11NH3]SnI3 which is a hybrid semiconductor with MoO3 type tin(II) iodide layers.
Thallium(I) iodide is used in mercury lamp to enhance its performance. It is mainly used for underwater lighting, since the blue green light produced has least absorption in water. Scintillator made by using iodide salt of thallium, sodium and cesium is utilized for radiation scintillation detectors.
Zinc(II) chloride is used as a catalyst, as a dehydrating and condensing agent, soldering flux and metal etchant. It is also employed in preserving anatomical specimens, wood preservatives, deodorant, disinfecting and embalming materials. It is employed as a mordant in printing and dyeing materials, and in the vulcanizing processes of fiber and rubber. It is useful as an electrolyte in dry cell batteries, in metal industry, in galvanizing iron and as an electrolyte for electroplating. It is useful in an organic synthesis, for example in the Friedel-crafts acylation, Fisher indole synthesis, Lucas reagent (zinc chloride with HCl), activation of allylic/benzylic halides towards reaction with olefins or with sodium cyanoborohydride catalyzed reduction of halides, organozinc reagents for use in Negishi coupling, and aldol condensation reactions.