Citation: Santhee Devi K V, Ramaraju B, Nageswara Rao G. Binary Complex Formation Equilibria of Ca(Ⅱ), Mg(Ⅱ) and Zn(Ⅱ) with L-dopa in Propylene Glycol-Water Mixtures[J]. Chinese Journal of Inorganic Chemistry, ;2013, 29(6): 1235-1242. doi: 10.3969/j.issn.1001-4861.2013.00.180 shu

Binary Complex Formation Equilibria of Ca(Ⅱ), Mg(Ⅱ) and Zn(Ⅱ) with L-dopa in Propylene Glycol-Water Mixtures

1.
Department of Inorganic & Analytical Chemistry, Andhra University, Visakhapatnam-530003, India

Received Date: 1 January 2013
Available Online: 2 March 2013

The complex formation equilibria involved in the binary systems of M(Ⅱ)-Dopa in 0～60% (V/V) propylene glycol (PG)-water mixtures were studied using pH-metric titration at constant temperature of 303 K and a constant ionic strength of 0.16 mol·L^-1 held by using sodium chloride as an electrolyte. The models contained MLH, ML₂, ML₂H and ML₂H₂ for Ca(Ⅱ) and Mg(Ⅱ), but ML, MLH, ML₂, ML₂H and ML₂H₂ for Zn(Ⅱ) in PG-water mixtures. The trend in the variation of stability constants with change in the dielectric constant of the medium was explained on the basis of electrostatic and non-electrostatic forces. Distributions of these species with pH value at different compositions of PG-water mixtures were also presented.
- binary species;metal;ligand;propylene glycol;pH-metric method
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沈阳化工大学材料科学与工程学院沈阳 110142