Journal
JOURNAL OF CHEMICAL AND ENGINEERING DATA
Volume 54, Issue 1, Pages 69-74Publisher
AMER CHEMICAL SOC
DOI: 10.1021/je8006106
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Funding
- National Natural Science Foundation of China [20773034]
- Natural Science Foundation of Hebei Province [B2007000237]
- Science Foundation of Hebei Normal University [L2006Z06]
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The complex [Dy(BA)(3)bipy](2) (BA = benzoate; bipy = 2,2'-bipyridine) was obtained and characterized by elemental analysis, molar conductance, infrared spectra (IR), ultraviolet spectra (UV), single-crystal X-ray diffraction, thermogravimetry, and differential thermogravimetry (TG-DTG) techniques. The crystal is monoclinic with space group P2(1)/n. The unit cell parameters are: a = 14.1114(8) angstrom, b = 15.3743(9) angstrom, c = 25.8887(14) angstrom, a = 90 degrees, beta = 103.4410(10)degrees, y = 90 degrees. Two Dy3+ ions are connected by four carboxylic groups through a bridging bidentate mode. The thermal decomposition behavior of the title complex under a static air atmosphere was studied using the TG-DTG, scanning electron microscopy (SEM), and IR techniques. The nonisothermal kinetics was investigated by using the double equal-double steps method and the Starink method. The mechanism function of the first decomposition step was determined. The thermodynamic parameters (Delta H-not equal, Delta G(not equal), and Delta S-not equal) and kinetic parameters (activation energy E and the pre-exponential factor A) were also calculated.
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