Synthesis and spectral characterization of 1-phenylglyoxal bis{N(4)ethylthiosemicarbazone} and its metal complexes |
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Authors: | Ackerman Lily J Webb James W West Douglas X |
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Institution: | (1) Department of Chemistry, Illinois State University, Normal, IL 61790-4160, USA |
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Abstract: | Nickel(II), copper(II), zinc(II), and cadmium(II) complexes of 1-phenylglyoxal bis{N(4)-ethylthiosemicarbazone} have been synthesized and characterized spectroscopically. The bis(thiosemicarbazone) and its diamagnetic complexes have been characterized by their melting points, i.r., electronic, mass and 1H n.m.r. spectra. The four-coordinate copper(II) complex was also studied by e.s.r. spectroscopy. Upon coordination, the loss of a proton from each thiosemicarbazone moiety occurs, and the bis(thiosemicarbazone) coordinates to nickel(II) and copper(II) as a dianionic, tetradentate N2S2 ligand; but for zinc(II) and cadmium(II), mass spectral results suggest the formation of binuclear complexes. |
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