Heat capacities and thermodynamic properties of Ni9(btz)12(DMA)6(NO3)6

Abstract

The low-temperature molar heat capacity of crystalline Ni 9 (btz) 12 (DMA) 6 (NO 3 ) 6 (1) (btz = benzotriazolate; DMA = N,N 0 -dimethylacetamide) was measured by temperature-modulated differential scanning calorimetry for the first time. The thermodynamic parameters such as entropy and enthalpy relative to reference temperature 298.15 K were obtained based on the above molar heat capacity data. The compound was synthesized by solvothermal method and characterized by powder X-ray diffraction and FT-IR spectra. Moreover, the thermal stability and the decomposition mechanism of Ni 9 (btz) 12 (DMA) 6 (NO 3 ) 6 were investigated by thermogravimetry (TG) analysis under air atmosphere from 300 to 873 K. The experimental results through TG measurement demonstrate that the compound has a two-stage mass loss in air flow.