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Updated: Mar 12, 2026

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Copper(II) complexes with imino phenoxide ligands: synthesis, characterization, and their application as catalysts
Mrinmay Mandal1, Kerstin Oppelt2, Manuela List3
1Institute of Inorganic Chemistry, Johannes Kepler University Linz, Altenbergerstr. 69, 4040 Linz, Austria ; Department of Chemistry, Indian Institute of Technology Patna, Patna, Bihar 800 013 India.
Abstract:
Four new copper complexes based on bidentate imino phenoxide ligands were synthesized and characterized by IR, UV-Vis spectroscopy, ESI mass spectrometry, single crystal X-ray diffraction, and electrochemistry. The crystal structures revealed that the copper(II) atoms are surrounded by phenolate oxygen and imine nitrogen atoms of two ligands in a distorted square-planar geometry. The existence of ligand-centered, as well as Cu(II)-centered quasi-reversible and reversible redox reactions are observed in the cyclic voltammetry experiments of all the complexes. All complexes are able to catalyze the ring-opening polymerization of rac-lactide yielding polymers with moderate molecular weights and moderately broad molecular weight distributions.
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