Syntheses and Properties of Copper(II), Nickel(II), and Cobalt(II) Complexes of Alkylthioglycolic Acids

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Abstract
Copper(II), nickel(II), and cobalt(II) complexes of alkylthioglycolic acids, R·S·CH2COOH (where R=ethyl, n-propyl, isopropyl, n-butyl, isobutyl, and s-butyl), were synthesized. Except for some copper complexes, these are new compounds. The attempt to synthesize the solid zinc complexes by the same method has not yet been successful. The relative stabilities of these complexes in the solid state seem to be Zn(II)<Co(II), Ni(II)<Cu(II), considering the yield of the syntheses of the products as well as the solvolizing tendency of the complexes. The nickel and cobalt complexes are expected to be in an octahedral form from the magnetic moments as well as from their electronic spectra. The relation between Taft’s substitution constants and the wave numbers of the maxima of the absorption spectra of these complexes in the solid state is not clear.
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