Determination of vaporization enthalpies of simple organic molecules by correlations of changes in gas chromatographic net retention times

Thermochemical studies for determination of the molar enthalpy of formation of aniline derivatives

“…Individual Values of --A~uo T = 298.15 where AtgC p refers to the difference in heat capacities of the liquid and gas phases, and CpLcal~ refers to the heat capacity of the liquid which is estimated. Heat capacity corrections and vaporization enthalpies corrected to 298.15 K are listed in columns 8 and 9, respectively, of Tables III and IV. Vaporization enthalpies for N,N-dimethyl-m-toluidine and N-ethyl-m-toluidine were determined by the method of correlation gas chromatography [11]. Tables V and VI list the observed retention times for a series of secondary and tertiary amines as a function of tern- Tables III and IV and Majer and Svoboda [15] in their critically reviewed compilations of thermochemical data.…”

“…The vaporization enthalpies of N,Nodimethyl-m-toluidine and N-ethyl-m-toluidine were measured in St. Louis using the technique of correlation-gas chromatography [11]. The CG correlation experiments were performed on an HP 5890 Series II gas chromatograph run isothermally on a 60 m BD-5 capillary column at a head pressure of 102 kPA using He as the carrier gas as previously described.…”

“…This value was recently checked in our laboratory. The mass of Melinex used in each experiment was corrected for the mass fraction of water (0.0032) [ 10] and the mass of carbon dioxide produced from the Melinex was calculated using the factor previously reported [11].…”

An Examination of the Thermodynamics of Fusion, Vaporization, and Sublimation of Ibuprofen and Naproxen by Correlation Gas Chromatography

“…The applicability of this technique as currently practiced to evaluate vaporization enthalpies was first demonstrated by using compounds with known vaporization enthalpies. 28 Since then it has been used to evaluate vaporization enthalpies of a variety of substances. References 23-27 and the references cited therein provide some typical examples.…”

The structure and thermochemistry of 3:4,5:6-dibenzo-2-hydroxymethylene-cyclohepta-3,5-dienenone (1) and some related compounds

“…The temperature T m refers to the mean temperature of measurement. Values of sln g H m (T m ) were calculated as the product of the gas constant, R, and the slope of the line obtained by plotting of the natural logarithm of reciprocal corrected retention time versus 1/T (K −1 ) as previously reported [12]. Experimental retention times are provided in Tables 3 and 4.…”