Abstract
The lattice energies of the cubic and orthorhombic forms of NaCN and KCN are calculated. Using experimental data on the enthalpy of transition between the polymorphic forms we estimate: U pot(NaCN) ortho = 732 kJ mol −1, U pot(NaCN) cubic = 729 kJ mol −1, U pot(KCN) ortho = 665 kJ mol −1 and U pot(KCN) cubic = 664 kJ mol −1. Using these results we estimate Δ H° ƒ( CN −)(g) = 33 kJ mol −1 , ΔH° solv(CH −)( g) = −326 kJ mol −1, the proton affinity of the gaseous CN − ion to be −1434 kJ mol −1 and the electron affinity of the cyanide radical to be 402 kJ mol −1. The charge distribution we assign compares extremely well with quantum mechanical calculations.
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