American Chemical Society
cg3011037_si_007.cif (16.51 kB)

A New Series of CuII Coordination Polymers Derived from Bis-pyridyl-bis-urea Ligands and Various Dicarboxylates and Their Role in Methanolysis of Epoxide Ring-Opening Catalysis

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posted on 2016-02-20, 06:53 authored by Subhabrata Banerjee, Dhurjati Prasad Kumar, Sabyasachi Bandyopadhay, N. N. Adarsh, Parthasarathi Dastidar
A crystal engineering approach has been adopted in synthesizing six new mixed ligand based CuII coordination polymers (CPs) derived from two bis-pyridyl-bis-urea ligands, namely, N,N′-bis-(3-pyridyl)­ethylene-bis-urea (L1) and N,N′-bis-(3-pyridyl)­propylene-bis-urea (L2), and various dicarboxylates. The single crystal structures of the coordination polymers displayed diverse supramolecular architectures such as a one-dimensional (1D) chain, 1D-looped chain, and two-dimensional grid. Although none of them displayed an open-framework structure, which is believed to be conducive for heterogeneous catalysis, almost all of them showed moderate to excellent epoxide ring-opening catalysis. Powder X-ray diffraction indicated structural changes/degradation of the CPs, which might be generating substrate accessible CuII species that presumably acted as the catalyst.