Cerium tribromide

There seem to be no direct calorimetric determinations of enthalpies of solution of rare-earth tribromides in nonaqueous solvents,3 and very few reports on the temperature variation of solubilities whence solution enthalpies might be roughly estimated. The most detailed set of data concerns cerium tribromide in pyridine (257). In this system there exists a series of solvates (cf. Section IH,C,2), but sufficient solubilities were determined for the estimation of enthalpies of solution of each solvate. These enthalpies are included in Fig. 3, which shows an extraordinary zig-zag variation of solubility with temperature. The actual values of enthalpies of solution cannot be accurate, but at least it is clear that they change sign and magnitude in an eccentric manner. 

Fig. 3. The dependence of the solubility (mole fraction) of cerium tribromide in pyridine on temperature (157). The numbers adjacent to the various lines and curves are the respective estimates for enthalpies of solution. 

The information available is collected in Table XXXI (46,149,157, 160,291,292,305-310). There are remarkably few data for hydroxylic solvents, but a reasonable amount for some aprotic solvents, especially ethers. Cerium tribromide is sparingly soluble in liquid ammonia (278) information on solubilities of tribromides in other inorganic non-aqueous solvents seems entirely lacking. Comparisons between tribromide and trichloride solubilities can readily be made using Tables XXIV to XXXI. 

CsCrOS CERIUM CHROMIUM TRIOXIDE 520 CrBr3 CHROMIUM TRIBROMIDE 559... 

Silver sulfate 10294-33-4 Boron tribromide 10294-34-5 Boron trichloride 10294-40-3 Barium chromate 10294-42-5 Cerium sulfate (ic)... 

Kudin, L.S., Butman, M.R, Motalov, V.B. et al. (2008) The thermodynamic parameters of monomer and dimer molecules of cerium and praseodymium tribromides. High Temp, 46, 350-356. 

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