Thermochemistry of amines: experimental standard molar enthalpies of formation of some aliphatic and aromatic amines

✍ Scribed by Sergey P. Verevkin

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 162 KB
• Volume: 29
• Category: Article
• ISSN: 0021-9614
• DOI: 10.1006/jcht.1997.0212

✦ Synopsis

The standard (p°= 0.1 MPa) molar enthalpies of formation DfH°m (1 or cr) at the temperature T = 298.15 K were measured using combustion calorimetry for N,N-dimethyloctylamine (A), 2,4-dimethylaniline (B), 2,5-dimethylaniline (C), N-ethylaniline (D), N-benzylaniline (E), and N,N-dimethylaniline (F). The standard molar enthalpies of vaporization D g l H°m or sublimation D g cr H°m of the compounds were obtained from the temperature variation of the vapour pressure measured in a flow system. In order to accomplish 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 transpiration method. The following results were obtained: DfH°m (l or cr) kJ•mol -1 D g l H°m or D g cr H°m kJ•mol -1 DfH°m(g) kJ•mol -1