Abstract
Abstract The techniques of thermogravimetry (TG) and differential thermal analysis (DTA) were applied to the study of the thermal decomposition of the lanthanoid (Ln) complexes of N,N,N′,N′-tetramethylurea (TMU), Ln(TMU)6X3 (X=ClO4, PF6, or BPh4). In general, the ease of decomposition increases in the order of BPh4<ClO4<PF6; in the latter two cases, the release (and, in the case of ClO4, partial oxidation) of the coordinated TMU molecules takes place together with the decomposition of the anions, leading finally to the formation of LnCl3 or LnF3, respectively. The data were also discussed on the basis of the effects of the lanthanoid contraction.
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