Syntheses, crystal structures and photoluminescences of two (4,4) topological coordination networks derived from the flexible bipyridyl ligands

Two new 2D coordination polymers, [Ag4(μ-4,4′-bpp)3(1,3-bdc)2]n · 2nH2O (1) and [Ag(μ-4,4′-bpp)2ClO4]n(2) (4,4′-bpp = 2,2′-bis(4-pyridylmethyleneoxy)-1,1′-biphenylene; 1,3-bdc = 1,3-benzenedicarboxylate) have been synthesized using three-layer diffusion methods. Single-crystal X-ray analyses reveal that they are both extended grid networks of the (4,4) topology. In complex 1, a chain built by Ag(I) centers with T-shaped and linear geometries is further connected by the interesting ligand-unsupported Ag⋯Ag interactions as well as the conjugated π systems to form an interdigitated 2-D coordination network. The corrugated (4,4) sheets of 2 are packed in the ab planes and stacked along the c   direction with the anions ClO4- occupying the gaps in the squares.

Graphical abstractTwo new 2D coordination polymers, [Ag4(μ-4,4′-bpp)3(1,3-bdc)2]n · 2nH2O (1) and [Ag(μ-4,4′-bpp)2ClO4]n (2) (4,4′-bpp = 2,2′-bis(4-pyridylmethyleneoxy)-1,1′-biphenylene; 1,3-bdc = 1,3-benzenedicarboxylate) have been synthesized. Single-crystal X-ray diffraction analysis reveals that complexes 1 and 2 exhibit different types of four-connected square planes with (4,4) topology. In 1, weak ligand-unsupported Ag⋯Ag interactions and conjugated π systems with additional aromatic rings favor the development of the structure. In 2, the corrugated (4,4) sheets are packed in the ab planes and stacked along the c   direction with the anions ClO4- occupying the gaps in the squares.Figure optionsDownload full-size imageDownload as PowerPoint slide