Standard molar enthalpies of formation and of sublimation of the terphenyl isomers

Phase transition thermodynamics of phenyl and biphenyl naphthalenes

“…This is in good agreement with the results and conclusions derived recently in our group [21] concerning the volatility and enthalpies of sublimation of m-terphenyl and p-terphenyl isomers.…”

Gas-phase thermochemistry of polycyclic aromatic hydrocarbons: an approach integrating the quantum chemistry composite scheme and reaction generator

“…23 which is based on the quantities retrieved from the work of da Silva and co-workers. 89 Interestingly, the combination of of 152.5 ± 2.5 kJ mol −1 and of 120.4 ± 4.9 kJ mol −1 obtained for 1,4-diphenylbenzene by Verevkin 90 and also listed in ref. 23 results in the of 272.9 ± 5.6 kJ mol −1 .…”

Thermodynamic study of 1,2,3-triphenylbenzene and 1,3,5-triphenylbenzene

“…As shown in figure 2, the enthalpy of the hypothetical isomerization is (9.9 ± 3.0) kJ Á mol À1 . Considering the values of D f H m ðortho-terphenyl; gÞ ¼ ð284:9 AE 3:6Þ kJ Á mol À1 [11] and of D f H m ðmeta-terphenyl; gÞ ¼ ð279:3 AE 3:9Þ kJ Á mol À1 [11] one can easily acknowledge a structural similarity between m-terphenyl/ 1,3,5-TPhB and between o-terphenyl/1,2,3-TPhB, as seen in Fig. 2.…”

“…o-terphenyl. Since the enthalpy of isomerization between the considered terphenyl isomers was already determined as (5.6 ± 2.8) kJ Á mol À1 [11], then the estimated value for the triphenylbenzenes would be (11.2 ± 4.0) kJ Á mol À1 . As can be seen, the estimated value and the experimentally one obtained for the isomerization enthalpy, differ only by 1.3 kJ Á mol À1 , enhancing the overall coherence of the experimental values obtained for both the terphenyls and the triphenylbenzenes studied in this work.…”

“…The establishment of a relation with the same parameters for its isomer 1,3,5-TPhB, whose structural features are well known, as well as a comparison to the structurally similar case of the previously studied terphenyls [11], may be a powerful tool to unveil the structural aspects of 1,2,3-TPhB. So, as a part of a systematic study on the thermodynamics of polyphenyls by our Research Group, this paper presents a complete experimental work on the determination of the standard molar enthalpies of formation in the gaseous state, at T = 298.15 K, for both triphenylbenzenes, which were derived from their standard molar enthalpies of formation in the crystalline state combined with their standard molar enthalpies of sublimation, obtained from mini-bomb combustion calorimetry and Knudsen mass-loss effusion technique, respectively.…”