Standard molar enthalpies of formation of lithium alkoxides

Article abstract of DOI:10.1016/0022-328X(93)83138-L

The standard (p⁰=0.1 MPa) molar enthalpies of formation of several crystalline lithium alkoxides, ΔH⁰_f(LiOR, cr), have been determined by reaction-solution calorimetry at 298.15 K.A linear correlation has been found between ΔH⁰_f(LiOR, cr) and ΔH⁰_f(ROH, l) for R=n-alkyl, enabling the prediction of data for other lithium alkoxides.The deviations from the linear correlation observed for R=i-Pr and t-Bu were tentatively explained in terms of the electronegativities of the OR groups.The experimental data were also used to derive the lattice energies and the thermochemical radii of the anions OR^-.The results were compared with those derived from the enthalpies of formation of the analogous sodium alkoxides, reported in a previous publication.