Citation: JIN Cheng-Wei, WANG Ye, XU Su-Ling, ZHANG Jian-Jun. Synthesis, Crystal Structures and Thermochemical Properties of Ternary Rare Earth Complexes Based on 3,4-Diethoxybenzoic Acid and 2,2'-Bipyridine[J]. Acta Physico-Chimica Sinica, ;2016, 32(9): 2232-2240. doi: 10.3866/PKU.WHXB201605263 shu

Synthesis, Crystal Structures and Thermochemical Properties of Ternary Rare Earth Complexes Based on 3,4-Diethoxybenzoic Acid and 2,2'-Bipyridine

JIN Cheng-Wei ^1,2, ,
WANG Ye ^1,2 ,
XU Su-Ling ³ ,
ZHANG Jian-Jun ^1,2

1.
Testing and Analysis Center, Hebei Normal University, Shijiazhuang 050024, P. R. China;
2.
College of Chemistry & Material Science, Hebei Normal University, Shijiazhuang 050024, P. R. China;
3.
Hebei Super Vision & Inspection Institute of Boiler & Pressure Vessel, Shijiazhuang 050061, P. R. China

Received Date: 15 April 2016
Revised Date: 26 May 2016

Fund Project: The project was supported by the National Natural Science Foundation of China (21473049) and Natural Science Foundation of Hebei Province, China (B2016205207).

Two novel ternary rare earth complexes [Ln(3,4-DEOBA)₃DIPY]₂DIPY (Ln = Er (1), Gd (2); 3,4- DEOBA = 3,4-diethoxybenzoate; DIPY = 2,2'-bipyridine) were synthesized and characterized by elemental analysis, infrared spectroscopy and X- ray single crystal diffraction. The experiments show that the two complexes are isomorphous with dinuclear structures, and adjacent structure units are stitched together through π-π interactions to form 1D chains and 2D-layered supramolecular structures. Simultaneous thermal analysis and Fourier transform infrared detection (TG-FTIR) was used to study the process of the thermal decomposition of the complexes. The molar heat capacity of the two complexes was obtained by differential scanning calorimetry (DSC). The smoothed values of the average molar heat capacity and thermodynamic functions of the complexes were calculated by the fitted polynomial and thermodynamic equations.
- 3,4-Diethoxybenzoic acid,
- 2,2'-Bipyridine,
- Rare earth complex,
- Thermal decomposition mechanism,
- Molar heat capacity,
- Thermochemical property
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