Abstract
The synthesis of 2,2′-dihydroxy-3,3′-di(carboxymethyl)-1,1′-binaphthyl (H
2L) and its novel metal complexes with Co
II, Ni
II, Fe
III and Th
IV salts are reported. The ligand and its metal complexes have been characterized on the basis of analytical, conductance, spectral (IR, UV–vis,
1H NMR, mass) and magnetic susceptibility measurements. The Mössbauer spectrum of the Fe
III complex indicates a low-spin octahedral geometry around the Fe
III ion. The IR and
1H NMR spectral data show that the ligand behaves in a dibasic bidentate fashion coordinating to two metal atoms through the two deprotonated naphthyl OH groups and acts in a dibasic tetradentate manner using both carbonyl oxygen's and the deprotonated naphthyl OH groups coordinating to two metal ions. Thermal studies (TGA, DTA) confirm the presence of solvents either inside or outside the coordination sphere and support the mechanism of the decomposition process. The value of
[
α
]
D
20
for the ligand has been determined in DMSO.