Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10393294 | Thermochimica Acta | 2005 | 7 Pages |
Abstract
Lattice energies and thermochemical radii of the anions ORâ (R = 2-Me; 2,6-Me2; 2,4,6-Me3; 2,6-t-Bu2) in alkali metal phenoxides, MOR (M = Li, Na, K, Rb and Cs) were investigated based on the corresponding standard molar enthalpies of formation determined by reaction-solution calorimetry. The results obtained at 298.15 K were as follows: ÎfHmâ (MOR, cr)/kJ molâ1 = â398.4 ± 1.1 (LiO-2-MePh), â423.4 ± 1.6 (LiO-2,6-Me2Ph), â457.3 ± 7.1 (LiO-2,4,6-Me3Ph), â346.6 ± 1.4 (NaO-2-MePh), â399.1 ± 1.5 (NaO-2,6-Me2Ph), â422.4 ± 7.1 (NaO-2,4,6-Me3Ph), â496.6 ± 7.1(NaO-2,6-t-Bu2Ph), â367.8 ± 1.2 (KO-2-MePh), â399.1 ± 1.4 (KO-2,6-Me2Ph), â368.8 ± 1.2 (RbO-2-MePh), â403.6 ± 1.3 (RbO-2,6-Me2Ph), â387.0 ± 1.6 (CsO-2-MePh) and â413.6 ± 1.3 (CsO-2,6-Me2Ph). Estimates of thermochemical raddi, lattice energies and standard enthalpies of formation of not experimentally measured alkali metal phenoxides was successfully done with a model based on the Kapustinskii equation and the set of values experimentally determined.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Carla Hipólito, João Paulo Leal,