Complexation Behavior of all-cis-1,2,3,4-Cyclopentanetetracarboxylic Acid and Hippuric Acid toward Transition Metal Ions: A Potentiometric Study

Dr. Nisha Agrawal

International Journal of Scientific Research in Science and Technology, 2026, vol. 13, issue 4, 361-368

Abstract: The stability constants of 1:1 binary complexes of Mn2+, VO2+, Co2+ and Zn2+ with hippuric acid and ternary complexes of said metal ions with all cis-1,2,3,4-cyclopentanetetracarboxylic acid (CPTA) as a primary ligand and hippuric acid as a secondary ligand were investigated potentiometrically in aqueous solution at 300C, 400C and 500C (+10C) temperature and at constant ionic strength =0.2 mol L-1 (KNO3). The stability constants of ternary complexes follow the order, VO2+ > Co2+ > Zn2+ > Mn2+. SThe thermodynamic parameters like free energy ( G0), enthalpy ( H0) and entropy ( S0) have also been calculated using the standard thermodynamic equations. The results showed that coordination process is spontanous and exothermic.

Keywords: stability constants; hippuric acid; ternary complexes; cis-1,2,3,4-cyclopentanetetra carboxylic acid (CPTA); free energy; enthalpy; entropy (search for similar items in EconPapers)
Date: 2026
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Persistent link: https://EconPapers.repec.org/RePEc:etm:ijsrst:v13:y2026:i4:id:1763

DOI: 10.32628/IJSRST2613437

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