Synthesis, characterization and thermal behavior on solid tartrates of light trivalent lanthanides
Solid state Ln–L compounds, where Ln stands for light trivalent lanthanides (L–Gd) and L is tartrate, have been synthesized. Thermogravimetry and differential thermal analysis (TG/DTA), differential scanning calorimetry (DSC), X-ray powder diffractometry, elemental analysis and complexometry were used to characterize and to study the thermal behaviour of these compounds. The results led to information about the composition, dehydration and thermal decomposition of the isolated compounds.
Solid compounds of Ce(III), Pr(III), Nd(III), and Sm(III) ions with chrysin
New solid amorphous compounds of Ce(III), Pr(III), Nd(III), and Sm(III) with 5,7-dihydroxyflavone (L,chrysin) were obtained. Their composition and some physicochemical properties were studied by elementary analysis, thermogravimetric analysis, magnetic measurements, 1H NMR, UV/Vis, and infrared spectroscopies. Upon heating, the hydrated compounds [LnL2(H2O)2Cl]·2H2O decomposed to the oxides. Structure of the compounds was elucidated on the basis of obtained results. It was found that chelation of the metal ion occurs at the 5-hydroxy-4-keto site.
Synthesis, characterization and thermal behaviour of solid-state compounds of 2-methoxybenzoate with some bivalent transition metal ions
compostos M-2-MeO-Bz foram sintetizados no estado solido, onde M representa os ions bivalentes Mn, Co, Ni, Cu e Zn e 2-MeO-Bz e o anion 2-metoxibenzoato. Esses compostos foram caracterizados e estudados, utilizando-se tecnicas de difracao de raios X pelo metodo do po, espectroscopia na regiao do infravermelho, complexometria e analise termica diferencial simultânea (TG-DTA), thermogravimetry, derivative thermogravimetry (TG/DTG) e calorimetria exploratoria diferencial (DSC). Os resultados permitiram obter informacoes com respeito a estequiometria, desidratacao, estabilidade termica e decomposicao termica.