Abstract
Three coordination polymers, [CdL(2,2′-bpy)] (1), [ZnL(phen)2] (2), and [ZnL(2,2′-bpy)] (3) (H2L = 2,5-dibenzoylterephthalic acid, 2,2′-bpy = 2,2′-bipyridine, and phen = 1,10-phenanthroline), were synthesized and crystallographically characterized. The compounds were further characterized by elemental analyses, FTIR, thermogravimetric analyses, and powder X-ray diffraction. Complex 1 exhibits a 2D sheet structure with (4,4) grid units, while 2 and 3 present infinite 1D zig–zag chain structures. The complexes are all extended into high-dimensional supramolecular networks through intermolecular hydrogen bonds and π–π stacking interactions. A structural comparison of 1–3 demonstrates that the characteristics of subsidiary ligands and slight difference in coordination models of L play a very important role in construction of the complexes. Additionally, luminescence of the complexes is also investigated at room temperature.
Acknowledgments
We gratefully acknowledge financial support by the NSF of China (21071027, 20771023), the China High-Tech Development 863 Program (2007AA03Z218) and analysis & testing foundation of Northeast Normal University, and Research Fund for the Doctoral Program of Hebei United University (2012).