The complex of Sm2(o-NBA)6(PHEN)2 (o-NBA, o-Nitrobenzoate; PHEN, 1,10-phenanthroline) was prepar-ed and characterized by elemental analysis, IR and UV spectraoscopy. The thermal decomposition mechanism of Sm2(o-NBA)6(...The complex of Sm2(o-NBA)6(PHEN)2 (o-NBA, o-Nitrobenzoate; PHEN, 1,10-phenanthroline) was prepar-ed and characterized by elemental analysis, IR and UV spectraoscopy. The thermal decomposition mechanism of Sm2(o-NBA)6(PHEN)2 was studied under a static air atmosphere by TG-DTG. The thermal decomposition kinetics of the complex for the first stage was studied under non-isothermal condition. The most probable mechanism functions of the thermal decomposition reaction for the first stage are: G(α)=[-ln(1-α)]1/2, f(α)=2(1-α)[-ln(1-α)]1/2. The activation energy E for the first stage is 259.50 kJ·mol-1, the pre-exponential factor A is 36.19×1018 min-1. The lifetime equation at weight-loss of 10% was deduced as lnτ=-36.70+27 572.12/T by isothermal thermogravimetric analysis.展开更多
The title complex [Sm(o-MOBA)3(phen)·H2O]2·4H2O has been synthesized by the reaction of SmCl3·6H2O with o-methoxybenzoic acid and 1,10-phenanthroline in 1∶3∶1 molar ratio. The crystal structure was de...The title complex [Sm(o-MOBA)3(phen)·H2O]2·4H2O has been synthesized by the reaction of SmCl3·6H2O with o-methoxybenzoic acid and 1,10-phenanthroline in 1∶3∶1 molar ratio. The crystal structure was determined by X-ray single crystal diffraction. The crystal belongs to triclinic system, space group P1 with a=1.203(10) nm, b=1.293(10) nm, c=1.306(11) nm, α=64.50(10)°, β=81.93(10)°, γ=74.81(10)°. The molecular structure shows that the Sm3+ ion coordinates to nine atoms. The carboxylate groups are bonded to the samarium ion in three modes: monodentate, bidentate chelating, tridentate chelating-bridging. CCDC: 603740.展开更多
The complex [Sm（p-MBA）3phen]2 （p-MBA, p-methylbenzoate; phen, 1,10-phenanthroline） was prepared and characterized by elemental analysis, IR and UV spectra. The thermal decomposition process of [Sm（pMBA）3phen]2 w...The complex [Sm（p-MBA）3phen]2 （p-MBA, p-methylbenzoate; phen, 1,10-phenanthroline） was prepared and characterized by elemental analysis, IR and UV spectra. The thermal decomposition process of [Sm（pMBA）3phen]2 was studied under a static air atmosphere by TG-DTG and IR techniques. Thermal decomposition kinetics was investigated employing a newly proposed method, together with the integral isoconversional non-finear method. Meanwhile, the thermodynamic parameters （AH#, △G# and AS#） were also calculated. The lifetime equation at mass-loss of 10% was deduced as In r=-24.7825＋ 18070.43/T by isothermal thermogravimetric analysis.展开更多
文摘The complex of Sm2(o-NBA)6(PHEN)2 (o-NBA, o-Nitrobenzoate; PHEN, 1,10-phenanthroline) was prepar-ed and characterized by elemental analysis, IR and UV spectraoscopy. The thermal decomposition mechanism of Sm2(o-NBA)6(PHEN)2 was studied under a static air atmosphere by TG-DTG. The thermal decomposition kinetics of the complex for the first stage was studied under non-isothermal condition. The most probable mechanism functions of the thermal decomposition reaction for the first stage are: G(α)=[-ln(1-α)]1/2, f(α)=2(1-α)[-ln(1-α)]1/2. The activation energy E for the first stage is 259.50 kJ·mol-1, the pre-exponential factor A is 36.19×1018 min-1. The lifetime equation at weight-loss of 10% was deduced as lnτ=-36.70+27 572.12/T by isothermal thermogravimetric analysis.
文摘The title complex [Sm(o-MOBA)3(phen)·H2O]2·4H2O has been synthesized by the reaction of SmCl3·6H2O with o-methoxybenzoic acid and 1,10-phenanthroline in 1∶3∶1 molar ratio. The crystal structure was determined by X-ray single crystal diffraction. The crystal belongs to triclinic system, space group P1 with a=1.203(10) nm, b=1.293(10) nm, c=1.306(11) nm, α=64.50(10)°, β=81.93(10)°, γ=74.81(10)°. The molecular structure shows that the Sm3+ ion coordinates to nine atoms. The carboxylate groups are bonded to the samarium ion in three modes: monodentate, bidentate chelating, tridentate chelating-bridging. CCDC: 603740.
基金Project supported by the Natural Science Foundation of Hebei Province （Nos. 203148 and 202140）, Hebei Education Department （No. 2004325） and Hebei Normal University （No. 2005Y12）.
文摘The complex [Sm（p-MBA）3phen]2 （p-MBA, p-methylbenzoate; phen, 1,10-phenanthroline） was prepared and characterized by elemental analysis, IR and UV spectra. The thermal decomposition process of [Sm（pMBA）3phen]2 was studied under a static air atmosphere by TG-DTG and IR techniques. Thermal decomposition kinetics was investigated employing a newly proposed method, together with the integral isoconversional non-finear method. Meanwhile, the thermodynamic parameters （AH#, △G# and AS#） were also calculated. The lifetime equation at mass-loss of 10% was deduced as In r=-24.7825＋ 18070.43/T by isothermal thermogravimetric analysis.
