Kinetics and Mechanism of the Reaction between Chromium(III) and 3,4-Dihydroxy-Phenyl-Propenoic Acid (Caffeic Acid) in Weak Acidic Aqueous Solutions

Table 2

Activation parameters for steps A−−→^𝑘2B and B−−→^𝑘3C.

ΔH^≠2(obs) (kJ mol^−1)	ΔS^≠2(obs) (J K^−1mol^−1)	ΔH^≠3(obs) (kJ mol^−1)	ΔS^≠3(obs) (J K^−1mol^−1)
28.6±2.9	−220 ± 10	62.9±6.7	−121 ± 22