Synthesis, crystal structure and thermal decomposition mechanism of a samarium o-chlorobenzoate complex with 1,10-phenanthroline

Abstract

O complexo [Sm(o-ClBA) 3 phen] 2 (o-ClBA= o-clorobenzoato; phen= 1,10-fenantrolina) foi preparado pela reação de SmCl 3 ·6H 2 O com ácido o-clorobenzóico e 1,10-fenantrolina. O complexo foi caracterizado por um estudo de difração de raios-X, análise elementar, espectroscopia no infravermelho e técnicas TG-DTG. O cristal é triclínico, grupo espacial P -I com a = 13,157(3) Å, b = 14,139(4) Å, c = 17,397(4) Å, α = 83,755(3)º, β = 84,064(3)º, γ = 73,434 (3) encontra-se coordenado a dois átomos de oxigênio de um grupo carboxilato bidentado quelante, cinco átomos de oxigênio de dois grupos carboxilatos bidentados ligados em ponte e de três grupos carboxilatos tridentados quelantes e ligados em ponte, e a dois átomos de nitrogênio de uma molécula de 1,10-fenantrolina, completando uma geometria monoencampuzada antiprismática quadrada. A decomposição térmica deste composto foi estudada por técnicas TG-DTG, e os parâmetros cinéticos da primeira etapa da decomposição foram determinados pelos métodos de Kissinger e Ozawa-Doyle. A equação de meia vida após 10% de perda de peso, lnτ= -26,8166+20319,94/T, foi deduzida por análise termogravimétrica da isoterma. is coordinated to two O atoms of one bidentate chelating carboxylate group, five O atoms of two bidentate bridging and two tridentate chelating-bridging carboxylate groups, and two N atoms of one 1,10-phenanthroline molecule to complete a distorted mono-capped square antiprism geometry. Its thermal decomposition mechanism was determined by TG-DTG techniques, and kinetic parameters have been studied on the first-step decomposition of [Sm(o-ClBA) 3 phen] 2 by means of Kissinger's method and Ozawa-Doyle's method. The lifetime equation at weight-loss of 10% was deduced as lnτ= -26.8166+20319.94/T by isothermal thermogravimetric analysis.

Synthesis, Crystal Structure, and Thermal Properties of a Holmium(III) Benzoate Complex with 1,10-Phenanthroline

“…Up to now, the studies on their structural and luminescence properties [1][2][3][4][5] have been systematic, and there has been much research on their thermal decomposition. [6][7][8][9] However, there are less studies on the thermochemical properties of the rare earth carboxylate complexes. The heat capacity C p,m is a key thermophysical quantity for the material from which other thermodynamic properties such as enthalpy, entropy, and Gibbs energy can be calculated.…”

Synthesis, crystal structure and thermal decomposition mechanism of the complex [Sm(p-BrBA)3bipy·H2O]2·H2O

“…Therefore, many types of lanthanide complexes with nitrogen-containing ligands were obtained [3][4][5][6][7][8][9]. In our previous work, we selected 1,10-phenanthroline as the second ligand, synthesizing the rare-earth complex of the benzoic acid and its derivatives, researching their crystal structure and thermal decomposition processes [10][11][12][13][14][15][16][17][18]. In this paper, we select 2,2 -bipyridine as the second ligand, synthesize Sm(III) complex of p-BrBA and 2,2 -bipyridine, and discuss its crystal structure and property.…”

Synthesis, structural investigation, thermal decomposition mechanism and sensitivity properties of an energetic compound [Cd(DAT)6](ClO4)2 (DAT=1,5-diaminotetrazole)

“…The high positive enthalpies of formation and high nitrogen content of tetrazoles have made their complexes interesting for energetic materials. The energetic complexes which use 5-cyano-tetrzolate [16,17], 5-nitro-tetrzolate [18][19][20][21][22][23] and 5,5-azotetrazolate [24] anions or 5-aminotetrzole [25][26][27], 1-methyl-5-amino-tetrzole [28,29] and 1,5-diaminotetrazole (DAT) [29,30] neutral molecules as ligands have been studied.…”