Heat capacities and thermodynamic properties of M(HBTC)(4,4′-bipy)·3DMF (M = Ni and Co)
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Two metal–organic frameworks (MOFs) of M(HBTC)(4,4′-bipy)·3DMF [M = Ni (for 1) and Co (for 2); H3BTC = 1,3,5-benzenetricarboxylic acid (1,3,5-BTC); 4,4′-bipy = 4,4′-bipyridine; DMF = N,N′-dimethylformamide] were synthesized by a one-pot solution reaction and a solvothermal method, respectively, and characterized by powder X-ray diffraction and FT-IR spectra. The low-temperature molar heat capacities of M(HBTC)(4,4′-bipy)·3DMF were measured by temperature-modulated differential scanning calorimetry (TMDSC) for the first time. The thermodynamic parameters such as entropy and enthalpy relative to reference temperature 298.15 K were derived based on the above molar heat capacity data. Moreover, the thermal stability and the decomposition mechanism of M(HBTC)(4,4′-bipy)·3DMF were investigated by thermogravimetry analysis (TGA). The experimental results through TGA measurement demonstrate that both of the two compounds have a three-stage mass loss in air flow.
KeywordsMetal–organic framework Molar heat capacity TGA TMDSC
The authors wish to acknowledge the financial support from the National Basic Research Program (973 program) of China (2010CB631303), the National Natural Science Foundation of China (No. 20833009, 20873148, 20903095, 50901070, 51071146, 51071081, and U0734005), National Natural Science Foundation of Liaoning (No. 20102224), Liaoning BaiQianWan Talents Program (Project No. 2010921050), IUPAC (Project No. 2008-006-3-100), The Joint Project of Guangdong Province and Chinese Academy of Sciences (2010A090100034), Dalian Scientific Project (2009A11GX052) and the State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology (Grant No. KFJJ10-1Z).
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