The complex of [Sm（p-MOBA）3phen]2 （p-MOBA, p-methoxybenzoate; phen,1 10-phenanthroline） was prepared and characterized by elemental analysis, IR, and UV spectroscopy. The thermal decomposition of the [Sm（p-MOBA）...The complex of [Sm（p-MOBA）3phen]2 （p-MOBA, p-methoxybenzoate; phen,1 10-phenanthroline） was prepared and characterized by elemental analysis, IR, and UV spectroscopy. The thermal decomposition of the [Sm（p-MOBA）sphen]2 complex and its kinetics were studied under a static air atmosphere by TG-DTG methods. The intermediate and residue for each decomposition stage were identified from the TG curve. The kinetic parameters and mecha- nisms of the first decomposition stage were obtained from the analysis of the TG-DTG curves by a new method of processing the data of thermal analysis kinetics. The lifetime equation at a mass loss of 10% was deduced as lnr= - 30.6795 ＋ 21034.56/Tby isothermal thermogravimelric analysis.展开更多
The new complex of [Sm（p-MOBA）3bath]2·4H2O （p-MOBA, p-methoxybenzoate; bath, 4,7-diphenyl-l,10- phenanthroline） was synthesized and characterized by elemental analysis, molar conductance, IR, UV and XRD patte...The new complex of [Sm（p-MOBA）3bath]2·4H2O （p-MOBA, p-methoxybenzoate; bath, 4,7-diphenyl-l,10- phenanthroline） was synthesized and characterized by elemental analysis, molar conductance, IR, UV and XRD patterns. The thermal decomposition of the complex was studied under the non-isothermal condition by TG-DTG and IR techniques. The most probable mechanism function of the dehydration process was obtained from the analysis of DSC curves of the complex employing the double extrapolated method on the basis of integral isoconversional non-linear （NL-INT） and Tang-Wanjun integral equations. The integral function of the mechanism was [1 -- （1 -α/2]1/2 and the corresponding kinetic parameters （activation energy E and the pre-exponential factor A） were obtained.展开更多
The structure of the complex {[ Eu (p-MOBA )_3·2H_2O ]·0.5H_2O·0.5(4,4′-bipy)}_∞ (p-MOBA: p-methoxybenzoate, 4, 4′-bipy: 4, 4′-bipyridine) was determined by singlecrystal X-ray diffraction study. Ea...The structure of the complex {[ Eu (p-MOBA )_3·2H_2O ]·0.5H_2O·0.5(4,4′-bipy)}_∞ (p-MOBA: p-methoxybenzoate, 4, 4′-bipy: 4, 4′-bipyridine) was determined by singlecrystal X-ray diffraction study. Each europium atom is coordinated with two oxygen atoms of thechelated carboxyl group, four oxygen atoms of the four bidentate bridging carboxylate groups and twooxygen atoms of two water mole-cules, forming an infinite polymeric chain structure. Excitation andluminescence spectra were observed at 77 K. The high resolution spectrum of the complex shows thatthe europium ion site in the crystal has low symmetry. The complex displays intense luminescencewhich may be related to the p-MOBA ligand and the polymeric coordination.展开更多
基金the Natural Science Foundation of Hebei Province (No. B2007000237)Hebei Education Department (No. 2004325)Hebei Normal University (No. L2006Z06, No. L2005Y12).
文摘The complex of [Sm（p-MOBA）3phen]2 （p-MOBA, p-methoxybenzoate; phen,1 10-phenanthroline） was prepared and characterized by elemental analysis, IR, and UV spectroscopy. The thermal decomposition of the [Sm（p-MOBA）sphen]2 complex and its kinetics were studied under a static air atmosphere by TG-DTG methods. The intermediate and residue for each decomposition stage were identified from the TG curve. The kinetic parameters and mecha- nisms of the first decomposition stage were obtained from the analysis of the TG-DTG curves by a new method of processing the data of thermal analysis kinetics. The lifetime equation at a mass loss of 10% was deduced as lnr= - 30.6795 ＋ 21034.56/Tby isothermal thermogravimelric analysis.
基金Project supported by the National Natural Science Foundation of China （Nos. 21073053, 21073052 and 20773034）, the Natural Science Foundation of Hebei Province （Nos. B2007000237, E2009000307） and Education Department Scientic Research Fund from Hebei Province （No. 2008469）.
文摘The new complex of [Sm（p-MOBA）3bath]2·4H2O （p-MOBA, p-methoxybenzoate; bath, 4,7-diphenyl-l,10- phenanthroline） was synthesized and characterized by elemental analysis, molar conductance, IR, UV and XRD patterns. The thermal decomposition of the complex was studied under the non-isothermal condition by TG-DTG and IR techniques. The most probable mechanism function of the dehydration process was obtained from the analysis of DSC curves of the complex employing the double extrapolated method on the basis of integral isoconversional non-linear （NL-INT） and Tang-Wanjun integral equations. The integral function of the mechanism was [1 -- （1 -α/2]1/2 and the corresponding kinetic parameters （activation energy E and the pre-exponential factor A） were obtained.
基金StateKeyProjectofFundamentalResearch (No .G19980 6 130 8) ,theNationalNaturalScienceFoundationofChina (No .2 99710 0 5)andNaturalScienceFoundationofBeijing (No.2 982 0 0 9)
文摘The structure of the complex {[ Eu (p-MOBA )_3·2H_2O ]·0.5H_2O·0.5(4,4′-bipy)}_∞ (p-MOBA: p-methoxybenzoate, 4, 4′-bipy: 4, 4′-bipyridine) was determined by singlecrystal X-ray diffraction study. Each europium atom is coordinated with two oxygen atoms of thechelated carboxyl group, four oxygen atoms of the four bidentate bridging carboxylate groups and twooxygen atoms of two water mole-cules, forming an infinite polymeric chain structure. Excitation andluminescence spectra were observed at 77 K. The high resolution spectrum of the complex shows thatthe europium ion site in the crystal has low symmetry. The complex displays intense luminescencewhich may be related to the p-MOBA ligand and the polymeric coordination.
