Thermal decomposition of metal complexes IV. Lanthanide(III) complexes with dibenzo-18-crown-6

The solid-state thermal dissociation reactions of the complexes of all the lanthanide(III) nitrates and thiocyanates (except Pm) with the cyclic polyether dibenzo-18-crown-6 were investigated. Thermal analysis was carried out in a dynamic atmosphere of dry nitrogen and under reduced pressure (5·10^?2 mm Hg). In both the conditions examined, the two series of complexes exhibit different thermal behaviours. The values of enthalpy change and “activation energy” for the dissociation reactions of the complexes with lanthanide thiocyanates show a periodic trend along the lanthanide series.