Thermochemistry of Heteroatomic Compounds. Enthalpy of Dissolution and Vaporization of Selected Trimethylsilyl Di- and Tetrathiophosphates


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Abstract

Enthalpy of vaporization (ΔvapH°) of trimethylsilyl esters of dithio- and tetratiophosphoric acids (RX)2P(S)SSiMe3 (X = O, S) have been determined from the experimentally determined enthalpies of their dissolution (ΔdissH°) in n-hexane at 296–298 K and the values of molar refraction (MRD) with correction a for the branching of the carbon substituent according to the equation ΔvapH° = ΔdH°(n-hexane) + 4.39 + 1.05(MRDα). The obtained vaporization values can be used to calculate the heats of formation of similar, thermally unstable, compounds for experimental calorimetry.

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V. V. Ovchinnikov

A.N. Tupolev Kazan National Research Technical University (KAI)

Author for correspondence.
Email: chem_vvo@mail.ru
Russian Federation, ul. K. Marksa 10, Kazan, 420111

S. A. Mal’tseva

A.N. Tupolev Kazan National Research Technical University (KAI)

Email: chem_vvo@mail.ru
Russian Federation, ul. K. Marksa 10, Kazan, 420111

N. V. Kremleva

A.N. Tupolev Kazan National Research Technical University (KAI)

Email: chem_vvo@mail.ru
Russian Federation, ul. K. Marksa 10, Kazan, 420111

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