Thermochemistry of heteroatomic compounds. Part 12. The theoretical calculation of vaporization and solvation enthalpies for primacy alkylphosphines and alkylendiphosphines

The theoretical calculations of vaporization and solvation enthalpies for p rimary alkylphosphines and alkylendiphosphines have been presented in this report. The calculations of the first from the above mentioned thermochemic al therms were performed with the use of Trouton's and Wadso's equations. T he obtained data allowed us to calculate the H2P-group contribution (16.0 /- 1.2 kJ mol(-1)) into vaporization enthalpies for the similar class of hi gh-molecular alkylphosphines and alkylendiphosphines. Enthalpies of non-specific solvation were obtained in accordance with the g eneral equation Delta H-solv = a(s) + b(s)MR(D) obtained previously for the estimation of the non-specific solvation enthalpy of P((III))-containing c ompounds in following solvents: carbon tetrachloride, benzene rho -xylene, methanol and pyridine.