Systematics on the thermal reactions of lanthanide malonates Ln2(C3H2O4)3 · nH2O in the solid state

Synthesis, characterization and thermal behaviour of heavy trivalent lanthanide malonates

“…The TG-DTA profiles, as well as the temperature range and the mass losses observed in each step of the TG curve are in disagreement with the results reported by Muraishi and co-workers [6]. These disagreements undoubtedly are due to the different experimental conditions, principally the static air atmosphere used to obtain the TG and DTA curves.…”

“…The intermediate is probably the corresponding dioxycarbonate, as already observed for the compounds of phenyl-substituted derivatives of benzalpyruvates with trivalent lanthanides [14] and lanthanide malonates [6]. Tests with hydrochloric acid solution on samples heated up to the temperatures of formation of these intermediates, as indicated by the corresponding TG-DTA curves, confirmed in all cases evaluation of CO and attributed to the formation of more derivative of carbonate due to the carbon dioxide evolved during the oxidation of the carbonaceous residues.…”

“…The papers published are concerned with the influence of the lanthanide contraction in the dehydration of malonates in solid state, discussed on the basis of TG curves [5]; The onset temperatures of dehydration and decomposition which measures the relative stability of anhydrous and hydrated compounds varying according to some physical parameters of lanthanides and lanthanide malonates [6]; studies on double malonates (potassium rare earth malonates) K Ln(C H O ) of gadolinium to holmium and 5 3 2 4 4 yttrium [7]; study of thermal decomposition of transition metal malonates [8,9]. In this paper, the object of the present research was to prepare solid state compounds of heavy trivalent lanthanide ions (i.e.…”

Thermal decomposition of lutetium propionate

“…The formation of Lu-oxycarbonate at an intermediate stage has been observed during the thermal decomposition of Lu 2 (C 3 H 2 O 4 ) 3 ·8H 2 O in nitrogen [23], Lu(CH 3 COO)·4H 2 O in air [24] and Lu(C 3 H 5 O 2 )·2CO(NH 2 ) 2 ·2H 2 O in air [25]. The formation of this compound thus appears as a common feature in the thermal decomposition path of Lu-based metallorganic compounds, but this may not be a rule [26,27].…”

“…Although the further decomposition of Lu-oxycarbonate to Lu 2 O 3 is generally reported to take place in a single step [17,23,24], it is worth noting that Moscardini D'Assunç ão et al [28] [25], which also proceed via the formation of the propionate salt as an intermediate product. It will therefore be interesting to study the decomposition behaviour of other rare-earth propionates to find out if this feature is a common characteristic of heavy rare-earth based propionates only or also extends to lighter rare-earth propionates.…”