Determination of Equilibrium Constants of Some Novel Antioxidant Compounds and Study on their Complexes with Some Divalent Metal ions in Ethanol-water Mixed

作者：Atabey Hasan^*; Findik Esra; Sari Hayati; Ceylan Mustafa

来源：Acta Chimica Slovenica, 2012, 59(4): 848-854.

• Antioxidant
• Potentiometric titration
• Phenolic compounds
• proton affinity

This study aims to investigate the nature and type of complexes formed in solution, between novel antioxidant compounds [P1(4-(1-(3-hydroxy-4-methoxyphenyl)propyl) benzene-1,2-diol) and P2(4-(1-(3-hydroxy-4-methoxyphenyl) propyl) benzene-1,3-diol)] and the ions Cu2+, Ni2+, Zn2+ and Co2+. Potentiometric titration technique was used to follow the formation of complexes during the course of coordination. The stability of the complexes formed was controlled through the determination of stability constants in aqueous ethanol solution at 25 +/- 0.1 C degrees and ionic strength of 0.1 M NaCl. Basicity of the ligand was also assessed by the determination of the dissociation constants of the ligand. All the constants were computed by computer refinement of pH-volume data using the SUPERQUAD program. The species distribution diagram of each type of complex has been obtained after computer calculation process.

• 出版日期2012