Synthesis and characterization of complexes formed by transition metal ions with thiophene imides as potential precursors to metal ion uptake and release agents

Abstract

Since the starting material, 2-thiophenecarboxamide, is readily available, methyl-2thienylimide was used as the preliminary basis for our studies (scheme 3), and most of our current work has been carried out using this ligand as a test case recognizing that similar chemistry would most probably occur for the methyl-3-thienylimide. In this paper we report on the successful complexation of Mn 2+ , Co 2+ , and Ni 2+ by methyl-2-thienylimide and the complexation of Co 2+ by methyl-3-thienylimide demonstrating the feasibility of this approach. The single crystal X-ray structures as well as the infrared and visible spectra of the complexes are discussed.