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Molecular Physics
An International Journal at the Interface Between Chemistry and Physics
Volume 33, 1977 - Issue 3
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Original Articles

Crystal radius and enthalpy of hydration of the cyanide ion.

Lattice energies of alkali metal cyanides, enthalpy of formation of CN-(g) and the electron affinity of the cyanide radical

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Pages 663-669 | Received 06 May 1976, Published online: 22 Aug 2006
 

Abstract

On the basis that the (electron density) crystal radius of the ion CN- is 1·77 Å, estimates have been made of the standard enthalpy of hydration of CN-(g) plus gaseous alkali metal ions. The results have been used in the derivation of the total lattice potential energies U POT(MCN) of alkali metal cyanides and other related thermochemical quantities. The following estimates have been made (298·15 K):

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