Synthesis and Characterization of Cadmium (II), Lead (II), and Indium (III) Ketoacidoximate Complexes and their Conversion to Metal Oxides

The reaction of Cd(II), Pb(II), and In(III) salts with in situ generated pyruvic acid oxime (ketoacidoximate) of the type [O2C-C(R)=NOH]-, (R=CH3 or -CH2-C6H5) results in five novel complexes [Cd{O2C-C(CH2-C6H5)=NOH}2(py)2]2 (py=C5H5N) 1, [Cd{O2C-C(CH2-C6H5)=NOH}2(im)2]2 (im=C3H4N2) 2, [Pb{O2C-C(CH3)=NOH}2(py)]2 3, [Pb{O2C-C(CH2-C6H5)=NOH}2(dmso)]2 (dmso=dimethyl sulfoxide) 4 and (NH4)[In{O2C-C(CH3)=NOH}4] 5. Single crystal X-ray structure determination of 1–5 reveal mono-nuclear In(III) and di-nuclear, µ2-oxo bridged Cd(II), Pb(II) complexes. 1–5 undergo thermal decomposition below 210ºC to the corresponding metal oxides.