Heat Capacities, Enthalpy Increments, and Derived Thermodynamic Functions for Pyrazine Between the Temperatures 5 K and 380 K

Published

October 16, 2008

Author(s)

Robert D. Chirico, S E. Knipmeyer, W V. Steele

Abstract

Heat capacities and enthalpy increments between the temperatures T nearly equal to}5 K and T nearly equal to}380 K were measured with adiabatic calorimetry for pyrazine. The triple-point temperature, enthalpy of fusion, heat capacities, and derived thermodynamic functions are reported for the solid and liquid phases. Three solid-to-solid phase transitions were observed, and the transition temperatures and enthalpies are reported. All results are compared with literature values. The adiabatic calorimetric results reported here provide key quantities required for thermodynamic consistency analyses, which can provide needed validation for calculational techniques (ab initio, semi-empirical, statistical, group contribution, etc.). Such validations are currently lacking for polyazines, such as pyrazine.

Citation

Journal of Chemical Thermodynamics

Pub Type

Journals

Keywords

enthalpy of fusion, heat capacity, phase transition, pyrazine, standard entropy, triple point temperature

Citation

Chirico, R. , Knipmeyer, S. and Steele, W. (2008), Heat Capacities, Enthalpy Increments, and Derived Thermodynamic Functions for Pyrazine Between the Temperatures 5 K and 380 K, Journal of Chemical Thermodynamics (Accessed May 16, 2024)