Thulium dichloride

Indeed, when Johnson (1969) published his paper, four experimental values of AfH°(RCl2, cr, 298) were known, for neodymium, samarium, europium, and ytterbium dichlorides. One decade later, Kim and Oishi (1979) could compare their estimates with the experimental values for six dichlorides, dysprosium and thulium dichlorides data having been added in the meantime. 

Noteworthy is the minor discrepancy (1.2 kJ/mol) between the enthalpy of formation for crystalline thulium dichloride that we calculated by the method above and the experimentally derived enthalpy from Goryushkin et al. (1989a). 

The shape of the curve shown in Figure 56 predicts a fairly high stability of neodymium and promethium dichlorides among the compounds with CN = 9 and dysprosium and thulium dichlorides among the compounds with CN = 7, that is, exactly those lanthanide dichlorides that (except PmCl2) not only were successfully synthesized but also were the subject of some physicochemical measurements that required heating to high temperatures. For instance, saturated vapor pressure of... 

TICI2 TITANIUM DICHLORIDE 1676 TmBr3[g] THULIUM TRIBROMIDE (GAS) 1719... 

TiCI2[g] TITANIUM DICHLORIDE (GAS) 1677 TmCI3 THULIUM TRICHLORIDE 1719... 

Such a close agreement between the calculated and experimental enthalpies of formation for samarium, europium, thulium, and ytterbium dichlorides allows us to claim that the calculation scheme used in the framework of this study leads to reliable results provided that the reference values are chosen adequately. 

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