UC14, Uranium chloride

U(C204)[Pg.264]

UC14, Uranium(IV) chloride, 21 187 UFj, Uranium(V) fluoride, (3-, 21 163 UFsK, Uranate(V), hexafluoro-, potassium, 21 166... 

In 1823 J. A. Arfwedson reduced the green oxide of uranium (then believed to be the lowest oxide) with hydrogen, and obtained a brown powder which he took to be the metal, but which is now known to be uranous oxide, U02 (25, 30). In 1841 Peligot, on analyzing anhydrous uranous chloride, UC14, found that 100 parts of this chloride apparently yielded about 110 parts of its elements uranium and chlorine. His explanation of this seemingly impossible result was that the uranous chloride reacts with water in the following manner ... 

ThCl4(dmpe)2 reacts with MeLi at 0°C to form ThMe4(dmpe)2, and this product reacts readily with hydrogen chloride or phenol in toluene to form ThCl4(dmpe)2 and [Th(OPh)4(dmpe)2] C7H8, which is isostructural with [U(OPh)4(dmpe)2]. This last is obtained either from UMe4(dmpe)2 and phenol or by direct reaction of UC14 with LiOPh in the presence of dmpe. The uranium(rv) complexes UX4(dmpe)2 (X = Br, Me) have also been reported. 

The (IV) and (VI) are the important oxidation states and therefore tlie more important phases of the chemistry of uranium may be related to the two oxides UO> and UO3. uranium dioxide and uranium trioxide. A series of salts such as the chloride and sulfate, UC14 and U(S04)2 9H20 is... 

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