Thermochemistry of imines: experimental standard molar enthalpies of formation

Author： Verevkin S.P. Morgenthaler J. Ruchardt C.

ISSN： 0021-9614

Source： Journal of Chemical Thermodynamics, Vol.29, Iss.10, 1997-10, pp. : 1175-1183

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Abstract

The standard (p#°=0.1 MPa) molar enthalpies of formation DeltafHm#°(l or cr) at the temperature T=298.15 K were measured using combustion calorimetry for benzophenone-imine (A), N-methyl-benzaldehyde-imine (B), N-benzyl-benzaldehyde-imine (C), N-benzyl-pivalophenone-imine (D), N-cyclohexyl-(2,4,6-trimethyl)-benzadehyde-imine (E), N-phenyl-benzaldehyde-imine (F), N-phenyl-4-nitro-benzaldehyde-imine (G), and N-phenyl-benzophenone-imine (H). The standard molar enthalpies of vaporization DeltalgHm#° or sublimation DeltacrgHm#° of compounds A to H wre obtained from the temperature variation of the vapour pressure measured in a flow system. Molar enthalpies of fusion DeltacrlHm of solid compounds were measured by d.s.c.DeltafHm(1 or cr)DeltacrlHmDeltalgHm or DeltacrgHmDeltafHm(g)kJ·mol-1kJ·mol-1kJ·mol-1kJ·mol-1A(l)172.69±0.8575.72±0.9724 8.4±1.3B(l)105.85±0.8351.22±0.20157.07±0.85C(l)183.78±0.7085.0±1.2268.8±1.4D(cr) 46.74±0.9827.86±0.21109.7±3.3156.4±3.4E(cr)-128.0±2.025.61±0.21104.85±0.83-23.2± 2.2F(cr)181.6±1.420.42±0.2198.1±1.2279.7±1.8G(cr)137.50±0.7424.56±0.21126.0±1.32 63.5±1.5H(cr)252.5±1.429.14±0.21119.7±1.8372.2±2.3