Synthesis and Complexation of a Novel vic‐Dithioglyoxime

Abstract

A new vic‐dioxime ligand, namely 2‐(4,5‐bishydroxyimino‐1,3‐dithiolan‐2‐ylidene)malonic acid diethyl ester (LH₂), has been synthesized in two steps starting with the condensation of carbon disulphide and malonic acid diethyl ester and subsequent reaction of the dithiolate intermediate with anti‐dichloroglyoxime (DCGO) in ethanol at 5 °C. LH₂ forms mononuclear N,N′‐coordinated planar metal complexes with Ni(II) and Co(II) and N,O‐coordinated (μ‐hydroxo‐bridged dimeric complex with UO₂(VI). The octahedral complex (LH)₂CoPyCl has been prepared by oxidation of the (LH)₂Co complex in the presence of pyridine, and it has been reduced to the Co(I) derivative by NaBH₄.

Keywords:

• Planar metal complexes
• Nickel(II)
• Cobalt(II)
• Uranyl
• Oxime

Acknowledgment

This work was supported by the Research Fund of the Technical University of Istanbul.