The enthalpy of formation of tetracyanomethane

Abstract

Tetracyanomethane has been burned in a rotating-bomb combustion calorimeter. The standard enthalpy of combustion was Δ H o c (C 5 N 4 , c) = −(616.43 ± 0.4) kcal th mol −1 , which yields a standard enthalpy of formation Δ H o f (C 5 N 4 , c) = −(146.18 ± 0.43) kcal th mol −1 . The mean bond dissociation energy 〈D〉(C CN) = 112 kcal th mol −1 is obtained.