Synthesis, characterization and thermal behaviour of solid-state compounds of 4-methoxybenzoate with lanthanum (III) and trivalent lighter lanthanides

Abstract

Solid-state M-4-MeO-Bz compounds, where M stands for trivalent La, Ce, Pr, Nd and Sm and 4-MeO-Bz is 4-methoxybenzoate, have been synthesized. Simultaneous thermogravimetry and differential thermal analysis (TG-DTA), differential scanning calorimetry (DSC), X-ray powder diffractometry, infrared spectroscopy and complexometry were used to characterize and to study the thermal behaviour of these compounds. The results led to information about the composition, dehydration, polymorphic transformation, ligand's denticity, thermal behaviour and thermal decomposition of the isolated compounds.

Synthesis, characterization and thermal studies on solid state 3-methoxybenzoate of lighter trivalent lanthanides

“…In the sodium 3-methoxybenzoate, strong bands located at 1568 cm -1 and 1400 cm -1 are attributed to the antisymmetrical and symmetrical frequencies of the carboxylate groups, respectively [23,24]. In the compounds considered in this work, analysis of the frequencies of the n as and n sym (COO -) bands shows that the lanthanides are linked to the carboxylate group by a bidentate bond with an incomplete equalization of bond lengths in the carboxylate anion; this is in agreement with the literature [5,[11][12][13]. The TG curves of the compounds are shown in Fig.…”

“…In the solid state, the works reported the thermal and spectral behaviour on solid compounds of benzoates and its derivatives with rare earth elements [6][7][8][9][10][11][12]; the vibrational and electronic spectroscopy study of lanthanides and effect of sodium on the aromatic system of benzoic acid [13][14]; the reaction of divalent cooper, cobalt and nickel with 3-hydroxy-4-methoxy and 3-methoxy-4-hydroxybenzoic acid and a structure for these compounds has been proposed on the basis of spectroscopy and thermogravimetric data [15]. The thermal decomposition of thorium salts of benzoic acid 4-methoxybenzoic acids in air atmosphere [16] and thermal behaviour of solid state 4-methoxy; 3-methoxy; 2-methoxybenzoates and benzoate of some bivalent transition metal ions have also been described [17][18][19][20].…”

Synthesis and magnetic studies of copper(II)-lanthanide(III) 5-bromosalicylideneglycylglycine

“…In the spectra of complexes, additional bands of medium intensity occur in the 556-560 cm -1 region and may be assigned to the metal-oxygen vibration. Therefore, the metal ions in these complexes may be bridged by ligands coordinating through the oxygen atoms [18][19][20][21][22][23][24].…”

Thermal decomposition of solid state compounds of lanthanide and yttrium benzoates in CO2 atmosphere

“…A survey of literature shows that the complexes of rare earth elements with benzoic acid and some of their derivatives have been investigated in aqueous solutions [1][2][3][4][5] and in solid state [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25].…”