Uranium tetraiodide

Oxidizer, Poison, Corrosive SAFETY PROFILE Poisonous and corrosive. Very reactive, a powerful oxidizer. Explosive or violent reaction with organic materials, water, acetone, ammonium halides, antimony, antimony trichloride oxide, arsenic, benzene, boron, bromine, carbon, carbon monoxide, carbon tetrachloride, carbon tetraiodide, chloromethane, cobalt, ether, halogens, iodine, powdered molybdenum, niobium, 2-pentanone, phosphoms, potassium hexachloroplatinate, pyridine, silicon, silicone grease, sulfur, tantalum, tin dichloride, titanium, toluene, vanadium, uranium, uranium hexafluoride. 

The iodide complexes are somewhat less stable, and well-characterized examples exist only for thorium, protactinium, and uranium. The thorium and uranium derivatives can be coveniently prepared by the reaction of iodine and metal, while protactinium tetraiodide is generated by reduction of Pals. The molecular structure of Thl4 has been examined the metal lies within a distorted square antiprism of iodide ions. 

Til4[g] TITANIUM TETRAIODIDE (GAS) 1688 UCI3 URANIUM TRICHLORIDE 1734... 

Fuger, J., Brown, D., Thermodynamics of the actinide elements Part IV. Heats and free energies of formation of the tetrachlorides, tetrab-romides, and tetraiodides of thorium, uranium and neptunium, J. Chem. Soc., Dalton Trans., (1973), 428-434. Cited on pages 96, 231, 232, 250, 260, 266, 415, 423, 523, 543. 

Uranium and thorium tetraiodides both form complexes with DMA, of composition Ul (DMA) and ThI (IMA)g, both of which are close to 2 1 electrolytes in nitromethane, but in very dilute solution (< lO" M) the molar conductivity of both tends towards the value for a 4 1 electrolyte, presumably because of entry of the solvent into the coordination sphere and displacement of the iodide ion. The uranium compound can also be obtained in poor yield ftom the chloride complex and sodium iodide in methyl cyanide at 50° in an inert atmosphere, but the reproducibility of the preparation under these conditions is poor. 

Tetraphenylarsonium salts of the hexaiodocomplexes (7) of thorium (IV) and uranium (IV), [Ph Asl MI, have also been obtained by crystallisation of the tetraiodide/methyl cyanide complexes with tetraphenylarsonium iodide in methyl cyanide solution in the absence of free iodine which, when present, precipitates as Ph4AsI. ... 

C3 2H2 2CO2I0O2, M-Peroxo-bis [(1,9 bis(2-pyridyl)-2,5,8-triaza-nonane)cobalt(III)] tetraiodide, 45B, 1051 C32H80N1 eUi, Tetrakis(bis(N,N -dimethylethylenediamido)uranium(IV)), 43B, 1159... 

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