Aqueous Solutions NMR, UV-Vis and Potentiometric Titrations of Cd2+ and Hg2+ with Clofibric Acid

摘要

In this study, we are presenting the reactions of the two metal ions Cd2+ and Hg2+ which are in the same group-family as zinc metal ion, i.e., group number 12, with the organic ligand Clofibric acid (CA). It appeared that the reaction of Cd2+ with CA in aqueous solutions at 25°C in 0.1 M ionic strength (NaNO3) formed a series of dimer complexes while that of the Hg2+ formed a series of monomer complexes. The difference in behavior of the two metal ions, although in the same family, is attributed to the difference in their ionic size. The detailed potentiometric, NMR and UV-Vis spectroscopic data for these reaction systems are discussed in this report. This paper is the first in a series that we are lunching to celebrate the 80th birthday of the Chemistry Nobel Laureate Roald Hoffmann of the chemistry department at Cornell University.