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 DastidarA 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.