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

Abstract

The reaction of Cd(II), Pb(II), and In(III) salts with in situ generated pyruvic acid oxime (ketoacidoximate) of the type [O 2 C-C(R) = NOH] -, (R=CH 3 or -CH 2 -C 6 H 5 ) results in five novel complexes [Cd{O 2 C-C(CH 2 -C 6 H 5 ) = NOH} 2 (py) 2 ] 2 (py = C 5 H 5 N) 1,Single crystal X-ray structure determination of 1-5 reveal mono-nuclear In(III) and di-nuclear, m 2 -oxo bridged Cd(II), Pb(II) complexes. 1-5 undergo thermal decomposition below 2108C to the corresponding metal oxides.(NH 2 )CH(CH 3 )COOH] and amavadin, a naturally occurring vanadium complex of (S,S) 2,2'-hydroxyimino dipropionic acid [COOH(CH 3 )CHN(OH)CH(CH 3 )COOH] [13] present in biological system. The coordination modes of the ligand observed in these complexes are shown in Scheme 1.The crystal structures of ketoacidoximate complexes are still unknown for many metals, and a rich structural chemistry can be expected due to the availability of multiple donor sites in the ligand. Herein, we report the synthesis and characterization of five ketoacidoximate complexes of cadmium (II), lead (II), and indium (III) and the CdO, PbO and In 2 O 3 particles formed by their thermal decomposition. Results and DiscussionThe condensation reaction of a-ketocarboxylic acid and hydroxylamine in water generates the ketoacidoximate ligand in [a] Dr.

Polynuclear Iron-Oxo/Hydroxy Complexes of Ketoacidoximate Ligands: Synthesis, Structures and Conversion to Ferric Oxide

“…Only a few examples with higher aggregates have been published so far. Dinuclear ketoacidoximate complexes are known with Ti, Cu, Cd and Pb, whereas tri‐ and tetranuclear complexes are reported only with Co and Zn . To the best of our knowledge, the compound 3 represents the highest nuclearity ketoacidoximate complex reported till now.…”