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Thermochemistry of neutral and protonated 1,7,7-trimethylbicyclo[2.2.1]heptan-2-thione (thiocamphor)

✍ Scribed by M.V. Roux; P. Jiménez; J.Z. Dávalos; R. Notario; J.-L.M. Abboud

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
145 KB
Volume
31
Category
Article
ISSN
0021-9614

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✦ Synopsis

The standard molar energy of combustion of 1,7,7-trimethylbicyclo[2.2.1]heptan-2-thione (thiocamphor), [53402-10-1], has been determined by using a rotary-bomb calorimeter. The vapour pressure of the compound was measured between the interval T = 261.96 K to T = 281.66 K, by the Knudsen-effusion technique. From the experimental results of this work, the standard molar enthalpies of combustion, sublimation and formation in the crystalline and gaseous state at the temperature of T = 298.15 K have been derived for thiocamphor: c H o m = -(6736.9 ± 3.3) kJ • mol -1 ; f H o m (cr) = -(86.8 ± 3.5) kJ • mol -1 ; sub H o m = (61.7 ± 0.9) kJ • mol -1 ; and f H o m (g) = -(25.1 ± 3.6) kJ • mol -1 . These results have been combined with their gas-phase proton affinities to yield the standard enthalpy of formation of the thiocamphor H + species.

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