화학공학소재연구정보센터
Thermochimica Acta, Vol.636, 71-84, 2016
Thermodynamic study on six tricyclic nitrogen heterocyclic compounds by thermal analysis and effusion techniques
The molar sublimation and vaporization enthalpies of acridine, phenanthridine, 1,7-phenanthroline, 1,10-phenanthroline, 4,7-phenanthroline and phenazine were determined at the averages of their respective experimental temperature ranges (Delta(g)(cr)H(0)m (< T >) and Delta(g)(vertical bar) H-m(0) (< T >), respectively) from the temperature dependencies of vapor pressure determined using Knudsen Effusion Mass Loss (KEML), Torsion Effusion (TE) and Isothermal Thermogravimetry (ITG) above their solid and liquid phases. The fusion characteristics (melting temperatures and the molar standard enthalpies of fusion at their melting temperatures) measured by Differential Scanning Calorimetry (DSC) were compared with the available literature values. Solid and liquid vapor pressure data determined by KEML, TE and ITG techniques as well as Delta(g)(cr)H(0)m (< T >) and Delta(g)(vertical bar) H-m(0) (< T >) values, adjusted at 298.15 K by using the values of C-p(cr) and Cp(1) calculated by a well-known group additivity method, were found to be fairly correlated and are consistent with the available literature data. Final Delta(g)(cr)H(0)m(298.15 K) values were also provided as weighted averages of all the available data. (C) 2016 Elsevier B.V. All rights reserved.