Molecular Association in Sodium Cyanide Vapor

摘要

Mass spectra of vapors from samples of NaCN indicate that the compound evaporates as NaCN(g) and Na2(CN)2(g) molecules at temperature around 1000deg;K. The mass spectrum resembles that obtained for sodium halide and hydroxide vapors. A comparison of relative ion currents produced by electron bombardment of NaCN vapors effusing from singlehyphen; and doublehyphen;ovenhyphen;type Knudsen cells, yielded information related to the processes of ion formation. For the reactionNa2lpar;CNrpar;2lpar;grpar;equals;2NaCNlpar;grpar;,we obtain Dgr;H1000deg;=41.0plusmn;3.0 kcal/mole dimer. This indicates a dimer stability comparable to that for Na2I2(g).