Kinetics and Mechanisms of the Chromium(III) Reactions with 2,4- and 2,5-Dihydroxybenzoic Acids in Weak Acidic Aqueous Solutions

Table 2

Activation parameters for steps 1 (𝑘₁) and 2 (𝑘₂) for the reactions of the two ligands 2,4- and 2,5-DHBA with chromium(III).

	2,4-DHBA	2,5-DHBA
ΔΗ^≠1 (kJ/mol^−1)	49,5	60,3
Δ𝑆^≠1 (Jmol^−1K^−1)	−103,7	−68,0
ΔΗ^≠2 (kJ/mol^−1)	45,13	54,55
ΔS^≠2 (Jmol^−1K^−1)	−185,9	−154,8