Solution Equilibrium Study of Divalent Metal Ions with Phenylpropanoid Derivatives and Acetylcysteine Ligands

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  • Nguyen Thuy Thi Dieu
    Department of Chemical Engineering, National Taiwan University of Science and Technology
  • Santoso Shella Permatasari
    Department of Chemical Engineering, National Taiwan University of Science and Technology
  • Nguyen Thuyen Thi Bich
    Department of Chemical Engineering, National Taiwan University of Science and Technology
  • Angkawijaya Artik Elisa
    Department of Chemical Engineering, National Taiwan University of Science and Technology Institute of Plant and Microbial Biology, Academia Sinica
  • Tran-Nguyen Phuong Lan
    Department of Mechanical Engineering, Can Tho University
  • Ju Yi Hsu
    Department of Chemical Engineering, National Taiwan University of Science and Technology

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<p>Solution equilibrium of divalent metal ions (M=Mn2+, Co2+, Ni2+, Cu2+ and Zn2+) with caffeic acid (ligand C) or dihydrocaffeic acid (ligand D) in binary system, and with acetylcysteine (ligand N) in ternary system were investigated at condition similar to human physiological temperature of 310.15 K and ionic strength of 0.15 mol·dm−3 NaCl. Potentiometry technique was used for the determination of formation constant (log β) assisted by spectrophotometry technique. The results indicated the formation of [ML], [MLH], [ML2], [ML2H] in binary species and [MLN], [MNLH], [MNLH2] in ternary species, where L represents ligands C or D. It was found that ligand D formed more stable complexes than that of ligand C, which were affected by the presence of double bond in the carboxylate moiety of ligand C. The speciation diagrams were simulated by HySS and discussed briefly, additionally the tendency of ternary complexes was evaluated from parameters Δ log KM and log X.</p>

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