THERMOCHEMISTRY OF AMINES - EXPERIMENTAL STANDARD MOLAR ENTHALPIES OFFORMATION OF SOME ALIPHATIC AND AROMATIC-AMINES

The standard (p degrees = 0.1 MPa) molar enthalpies of formation Delta (f)H(m) degrees (I or cr) al the temperature T = 298.15 K were measure d using combustion calorimetry for N,N-dimethyloctylamine (A), 2,4-dim ethylaniline (B), 2,5-dimethylaniline (C), N-ethylaniline (D), N-benzy laniline (E), and N,N-dimethylaniline (F). The standard molar enthalpi es of vaporization Delta(l)(g)H(m) degrees or sublimation Delta(cr)(g) H(m) degrees of the compounds were obtained from the temperature varia tion of the vapour pressure measured in a flow system. In order to acc omplish the thermochemical investigation of tert-butyl-methylamine (G) , tert-butyl-isopropylamine (H), and 2,2,6,6-tetramethylpiperidine (I) , their molar enthalpies of the vaporization were measured by the tran spiration method. The following results were obtained: [GRAPHICS] (C) 1997 Academic Press Limited.