where ˇ is the heating rate, Tmis the peak temperature, A is thepre-exponential factor, Ea is the activation energy and R is the gas constant. Fig. 2 shows the Kissinger’s plots of solid state linkage isomerization of above-mentioned complexes. The value of rate constant at a given temperature (ki) was calculated by Arrhenius equation [36], Eq (6):The activation enthalpy (H/=), entropy (S/=) and free energy(G/=) could be calculated using the Eyring equation [38], Eq. (7):