Abstract
Solid-state Ln-L compounds, where Ln stands for heavy trivalent lanthanides (Tb-Lu) and L is malonate, have been synthesized. Simultaneous thermogravimetry and differential thermal analysis (TG-DTA), differential scanning calorimetry (DSC), X-ray powder diffractometry, infrared spectroscopy, TG-FTIR system, elemental analysis and complexometry were used to characterize and to study the thermal behaviour of these compounds. The dehydration of the compounds begins at 303 K and the anhydrous compounds are stable up to 548 K. The results also provided information concerning the ligand’s denticity, thermal behaviour and identification of some gaseous products evolved during the thermal decomposition of these compounds.
Highlights
Lanthanide compounds have a numerous applications in various industrial and technological fields, in materials science, principally due to luminescence and/or magnetic properties
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 K5Ln(C3H2O4)4 of gadolinium to holmium and yttrium [7]; study of thermal decomposition of transition metal malonates [8,9]
These results permitted to establish the stoichiometry of these compounds, which is in agreement with the general formula: Ln2(CH2C2O4)3·nH2O, where Ln = Tb to Lu and CH2C2O4 is malonate, with n = 7.5 (Tb, Dy, Ho) and 7 (Er, Tm, Yb, Lu)
Summary
Lanthanide compounds have a numerous applications in various industrial and technological fields, in materials science, principally due to luminescence and/or magnetic properties. The object of the present research was to prepare solid state compounds of heavy trivalent lanthanide ions (i.e. Tb to Lu) with malonate and to characterize and to investigate by means of complexometry, elemental analysis, X-ray powder diffractometry, infrared spectroscopy, simultaneous thermogravimetry and differential thermal analysis (TG-DTA), differential scanning calorimetry (DSC) and TG-FTIR system.
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