| Abstract |
The bonding energetics in a variety of alkaline metal, alkoxides and phenoxides, MOR, was investigated based on the corresponding enthalpies of formation in the crystalline state determined by reaction-solution calorimetry. The results obtained at 298.15 K were as follows: Delta(f)H(m)(o) (MOR, cr)/kJ mol(-1) = 382.7+/-1.4 (LiOC6H5,), 513.6+/-2.5 (NaO-nC(6)H(13)), 326.4+/-1.4 (NaOC6H5), 375.2+/-3.4 (KOCH3)(,) 434.5+/-2.7 (KOC2H5), 467.1+/-5.2 (KO-nC(3)H(7)), 459.3+/-2.1 (KO-nC(4)H(9)), 464.6+/-5.7 (KO-tC(4)H(9)), 464.3+/-2.5 (KO-nC(6)H(13)), 333.3+/-3.1 (KOC6H5), 380.6+/-2.9 (RbOCH3), 434.1+/-2.9 (RbOC2H5), 345.3+/-2.9 (LiOC6H5), 379.1+/-3.0 (CsOCH3), 432.3+/-3.1 (CsOC2H5), 466.9+/-5.0 (CsO-nC(3)H(7)), 461.3+/-3.5 (CsO-nC(4)H(9)), 461.9+/-2.5 (CsO-tC(4)H(9)), 349.2+/-1.4 (CsOC6H5). These results together with revised Delta(f)H(m)(o) (MOR, cr) values from the literature, were used to derive a consistent set of lattice energies for the MOR compounds and discuss general trends in the structure-energetics relationship based on the Kapustinskii equation. |
