Synthesis, Crystal Structure, and Thermal Decomposition Kinetics of the Complex of Dysprosium Benzoate with 2,2′-Bipyridine

• Published in: Journal of chemical and engineering data 2009-01, Vol.54 (1), p.69-74
• Main Authors: Tian, Liang, Ren, Ning, Zhang, Jian-Jun, Sun, Shu-Jing, Ye, Hong-Mei, Bai, Ji-Hai, Wang, Rui-Fen
• Format: Article
• Language: English
• Subjects: Chemistry; Coordination compounds; Exact sciences and technology; Inorganic chemistry and origins of life; Preparations and properties
• ISSN: 0021-9568; 1520-5134
• DOI: 10.1021/je8006106

The complex [Dy(BA)3bipy]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) Å, b = 15.3743(9) Å, c = 25.8887(14) Å, α = 90°, β = 103.4410(10)°, γ = 90°. 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 (ΔH ⧺ , ΔG ⧺ , and ΔS ⧺ ) and kinetic parameters (activation energy E and the pre-exponential factor A) were also calculated.