Synthesis, thermal properties and spectroscopic study of solid mandelate of light trivalent lanthanides

Studies on the thermal decomposition of lanthanum(III) valerate and lanthanum(III) caproate in argon

“…However, beside the fact that the atmosphere and heating rate were not stated, the nature of the gaseous decomposition educts was not supported by any experimental evidence. On the other hand, beside alkanoates, many other types of La-carboxylates have been studied and reports on thermal decomposition encompass compounds such as lanthanum citrate [20,21], oxalate [22][23][24][25], tartrate [26,27], malonate [28], acetylacetonate [29,30], squarate [31], mandelate [32], succinate [33], sebacate [34], 2, 5-dihydroxybenzoate [35], 2,6-dihydroxybenzoate [36], 3,4-dihydroxybenzoate [37], 3,4,5-trihydroxybenzoate [38], 2-methoxybenzylidenepyruvate [39], 4-methylbenzylidenepyruvate [40] and 2-naphthoate [41].…”

Synthesis, Characterization and Thermal Behaviour of Solid-State Compounds of Heavy Trivalent Lanthanide and Yttrium Mandelates

“…As a continuation of our previous study [13], since our papers involving solid compounds with trivalent lanthanides and several organic ligands, the profiles of TG and DTA curves, as well as the thermal behaviour have shown similar characteristics among the light and heavy trivalent lanthanide compounds [14][15][16][17][18][19]. The present paper deals with the preparation of solid-state compounds of heavy trivalent lanthanides (i.e.…”

“…3a. The similarity observed in the TG-DTA profiles of some compounds (with three patterns of thermal behaviour) was not observed in the light trivalent lanthanide mandelates [13]. Thus, the features of each of these compounds are discussed on the base of their similar thermal profiles.…”

“…The total mass loss up to 550 °C (Tm), 500 °C (Yb) and 600 °C (Lu) is in agreement with the formation of the respective oxide, Ln 2 O 3 , as final residue (Ln = Tm, Yb, Lu) as final residue. No intermediate derivative of carbonate was observed in the thermal decomposition of these compounds, as observed for the lanthanum mandelate [13] and for other compounds of lanthanides with organic ligand containing carboxylic group [33]. The temperature ranges (θ), mass losses (m) and peak temperatures (T p ) observed for each step of the TG-DTA curves are shown in Table 5.…”

“…Some studies related to successive formations constants [6], calorimetric titration of complexation of lanthanide mandelates with 1,10-phenanthroline [7], kinetics of complexation [8], preparation and structural analysis of lanthanide complexes with α-hydroxyphenylacetic acid and 1,10-phenanthroline as ligands [9], synthesis, crystal and spectroscopic studies of some lanthanides [10][11][12] and synthesis, thermal properties and spectroscopic study of solid mandelate of light trivalent lanthanides [13] were also reported.…”