Resumen de Synthesis, crystal structure, and thermal decomposition kinetics of holmium with benzoate and 2, 2'-bipyridine complex
Sun Jing Sun, Ning Ren, Shu Mei He, Jian-Jun Zhang
The complex [Ho(BA)3bipy]2 (BA=benzoate; bipy=2,2'-bipyridine) was synthesized and characterized by elemental analysis, infrared spectra, ultraviolet spectra, single-crystal X-ray diffraction, thermogravimetry and differential thermogravimetry (TG-DTG) techniques. The crystal is monoclinic with space group P2/n. The unit cell parameters are: a=14.1114(8) Å, b=15.3743(9) Å, c=25.8887(14) Å, β=103.555(2)°. Two Ho3+ ions are connected by four carboxylic groups through a bridging bidentate mode. The thermal decomposition behavior of the title complex under nitrogenous atmosphere was studied using the TG-DTG, and IR techniques. The non-isothermal kinetics was investigated by using the Popescu method and the integral iso-conversional non-linear method (NL-INT). The mechanism function of the first decomposition step was determined. The thermodynamic parameters (ΔG≠, ΔH≠ and ΔS≠) were also calculated, and kinetic parameters (activation energy E and the pre-exponential factor A) were also obtained.
