Palladium complexes containing imino phenoxide ligands: synthesis, luminescence, and their use as catalysts for the ring-opening polymerization of rac-lactide

Mrinmay Mandal,Manuela List,Ian Teasdale,Debashis Chakraborty,Günther Redhammer,Uwe Monkowius

doi:10.1007/s00706-017-2119-1

Abstract

The preparation, structural characterization, luminescence, and catalytic activity of three palladium(II) complexes bearing imino phenoxide ligands are reported. The X-ray studies revealed that the complexes are mononuclear with palladium centres coordinated in a square-planar coordination environment. Two of the complexes are emissive in solution at room temperature. The catalytic activities towards the ring-opening polymerization of rac-lactide (rac-LA) were tested. Polymers with moderate molecular weights and relatively broad dispersity (Ð) were obtained. Kinetic studies revealed that the polymerization followed first-order kinetics.Graphical abstract

Highlights

The preparation, structural characterization, luminescence, and catalytic activity of three palladium(II) complexes bearing imino phenoxide ligands are reported
In recent publications we have shown that main group as well as transition metal imino phenoxide complexes can be used as polymerization catalysts, e.g. for the preparation of polyesters like poly(lactic acid) (PLA) and poly(caprolactone) (PCL) [18,19,20,21,22,23]
We report on the synthesis, structural characterization, photophysical, and catalysis studies of some square-planar Pd(II) complexes bearing imino phenoxide ligands with different structural modifications

Summary

Introduction

Abstract The preparation, structural characterization, luminescence, and catalytic activity of three palladium(II) complexes bearing imino phenoxide ligands are reported. The X-ray studies revealed that the complexes are mononuclear with palladium centres coordinated in a square-planar coordination environment. Keywords Imino phenoxide Á Palladium Á Crystal structure Á ROP Á rac-Lactide Á Luminescence Introduction Institute for Chemical Technology of Organic Materials, Johannes Kepler University Linz, Altenbergerstr.

Results

Conclusion