Thorium powder pattern

Following the characterization of U(COT)2, the analogous thorium complex was synthesized 12). Its physical and chemical properties were so different from those of the uranium compound that initially there was question as to whether the complex had the same -sandwich structure. The X-ray structure anal5 is however showed it to be isostructural with U(COT)2 11). Subsequently, Pu(COT)2 13), Np(COT) 13), and Pa(COT)2 14, 15) have been prepared and their X-ray powder patterns show them all to be isostructural with U(COT)2. 

Heating a stoichiometric mixture of ThF4, Th02, and thorium metal for four days at 1473 K in a nickel tube has been reported to produce ThOF. A powder X-ray diffraction pattern suggested a face-centered cubic structure with a = 568 pm and a disordered anionic occupation. It is antiferromagnetic, stable in moist air, in vacuo, and in an inert gas atmosphere, up to 1673 K 130). 

The compound was synthesised by reaction of thorium dioxide with a 20% excess molten thorium iodide. Most of the excess thorium iodide was subhmed from the product. Analytical results yielded 45.5% Th and 51.41% 1 (theoretical 46.2% Th and 50.6% I). The X-ray powder diffraction pattern was given but the data could not be indexed on the basis of a unit cell with orthorhombic or higher syimnetiy. 

Ferraro et al. [1] showed that only the penta- and tetra-hydrate could be obtained from the Th(N03)4-HN03-H20 system (Fig. 23). The composition for co-existence of the penta- and tetra-hydrate was reported as 17.70 wt% water - 28.67 wt% thorium tetranitrate and that for the tetrahydrate and an unidentified anhydrous phase 5.10 wt% water-21.13 wt% thorium tetranitrate. They postulated that phases such as Th(N03)6 6H20 and Th(N03)4 5.5H20 were actually the pentahydrate X-ray powder studies confirmed [2] that Th(N03)4 5.5H20 [3] exhibited the same diffraction pattern as Th(N03)4 5H20 [2, 4]. 

---