Phase transition in hydrazinium hydrogen oxalate. A calorimetric study of the short hydrogen bond system
作者： Hiroshi Suga , Takasuke Matsuo
DOI: 10.1016/0040-6031(86)85008-0
关键词: Enthalpy 、 Hydrogen bond 、 Schottky anomaly 、 Hydrogen 、 Oxalate 、 Chemistry 、 Calorimetry 、 Heat capacity 、 Thermodynamics 、 Phase transition
摘要: Abstract The heat capacity of hydrazinium hydrogen oxalate crystal has been measured between 14 and 300 K. A first-order phase transition was found at 217.6 Total enthalpy entropy are 1.09 kJ mol−1 4.18 J K−1 mol−1, respectively. high temperature supercooled to 165−170 the significantly larger than that low phase. By fitting a Schottky function difference, energy level (135 ± 4) cm−1 above ground state related tunneling splitting levels short acidic bond. thermodynamic model is proposed in which anomaly plays main role. Far-infrared spectra reported for frequency range 400–30 temperatures 295 90
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