Syntheses, crystal structures and properties of three one-dimensional coordination polymers generated from flexible bipyridyl ligands

Three new interesting coordination polymers, [Cu2(μ-4,4′-bpp)(OAc)4]n (1), [Cu(μ-3,3′-bpp)(SCN)2]n (2) and [Zn(μ-4,4′-bpp)2(dca)2·0.5H2O]n (Hdca=dicyanamide) (3) have been synthesized and structurally characterized. Compounds 1-3 consist of different one-dimensional zigzag chains arising from the different positions of donor atoms (4,4′-bpp or 3,3′-bpp). Thermogravimetric analyses show that the three compounds have very similar thermal behaviors and are stable up to about 270 °C. Compound 3 exhibits a blue luminescence with the emission maximum at ca. 457 nm upon excitation at 370 nm which is assigned to the intraligand emission from 4,4′-bpp ligand.