heat capacity of activation, Δ‡ Cpo

A quantity related to the temperature coefficient of $Δ ‡ H$ (enthalpy of activation) and $Δ ‡ S$ (entropy of activation) according to the equations:

$Δ ‡ C p = ( ∂ Δ ‡ H ∂ T ) p = T ( ∂ Δ ‡ S ∂ T ) p$

If the rate constant is expressible in the form

$ln k = a T + b + c ln T + d T$ ,

then:

$Δ ‡ C p = ( c − 1 ) R + 2 d ( R T )$

SI unit: $J mol −1 K −1$ .

Source:

PAC, 1994, 66, 1077 (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1120

PAC, 1996, 68, 149 (A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC Recommendations 1996)) on page 168