Structural and topological regulation on cobalt coordination polymers with mixed ligands

Structural and topological regulation on a series of cobalt coordination polymers (CPs) built by V-shaped O-donor ligand, 4,4'-(hexafiuoroisopropylidene)-bis(benzoic acid) (H2L), and auxiliary N-donor ligands was reported. The introduction of secondary N-donor ligands (2,2'-bipyridine, BPY; 1,3-bis(4-pyridyl)propane, BPP) greatly affected the overall structures of cobalt CPs, due to the structural taloring/directing effect of the neutral coordinating molecules BPY and BPP. The CPs were characterized by single crystal X-ray diffractions, infrared spectroscopy, thermogravimetry measurements, elemental analyses and X-ray powder diffractions. X-ray crystallography suggested the CPs possess 2-D covalent network structures, which identified versatile underlying topological structures. Moreover, magnetic properties of two complexes were also explored. (C) 2017 Elsevier B.V. All rights reserved.