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Table 3 Thermodynamic parameters for the interaction between In with ARS and In-ARS complex with F¯ ion

From: Fabrication of In(III)-alizarin red S complex trap for efficient detection of fluoride ion in aqueous environs

Thermodynamic parameters Interaction between
In and ARS In-ARS and F¯ ion
Stoichiometry 1:1.15 1:1.67
Association constant (Ka) (M−1) 1.22 × 103 (± 209) 2.96 × 106 (± 0.391)
ΔH (cal/mol) − 4748 (± 547.1) 3551 (± 15.52)
ΔS (cal/mol/deg) − 1.80 40.9
T (K) 298 313
ΔG (cal/mol) − 4211.42 or − 4192.14 − 9250.48 or − 9232.85