Thermochemistry of Li, Na, K, Rb and Cs alkylated phenoxides
作者： Carla Hipólito , João Paulo Leal
DOI: 10.1016/J.TCA.2005.02.027
关键词: Standard enthalpy change of formation 、 Calorimetry 、 Physical chemistry 、 Thermochemistry 、 Alkylation 、 Inorganic chemistry 、 Alkali metal 、 Lattice energy 、 Chemistry 、 Standard enthalpy of formation 、 Kapustinskii equation
摘要: Abstract Lattice energies and thermochemical radii of the anions OR− (R = 2-Me; 2,6-Me2; 2,4,6-Me3; 2,6-t-Bu2) in alkali metal phenoxides, MOR (M = Li, Na, K, Rb Cs) were investigated based on corresponding standard molar enthalpies formation determined by reaction–solution calorimetry. The results obtained at 298.15 K as follows: Δ f H m ∘ (MOR, cr)/kJ mol−1 = −398.4 ± 1.1 (LiO-2-MePh), −423.4 ± 1.6 (LiO-2,6-Me2Ph), −457.3 ± 7.1 (LiO-2,4,6-Me3Ph), −346.6 ± 1.4 (NaO-2-MePh), −399.1 ± 1.5 (NaO-2,6-Me2Ph), −422.4 ± 7.1 (NaO-2,4,6-Me3Ph), −496.6 ± 7.1(NaO-2,6-t-Bu2Ph), −367.8 ± 1.2 (KO-2-MePh), −399.1 ± 1.4 (KO-2,6-Me2Ph), −368.8 ± 1.2 (RbO-2-MePh), −403.6 ± 1.3 (RbO-2,6-Me2Ph), −387.0 ± 1.6 (CsO-2-MePh) −413.6 ± 1.3 (CsO-2,6-Me2Ph). Estimates raddi, lattice not experimentally measured phenoxides was successfully done with a model Kapustinskii equation set values determined.
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