2-D open frameworks and blue fluorescence of two new zinc coordination polymers with mixed ligands

Two new coordination polymers [Zn(bdc)(4,4′-bipy)(H2O)] · 1.5H2O (1) and [Zn2(bdc)2(4,4′-bipy)(EtOH)(H2O)2] · EtOH · 0.5H2O (2) (H2bdc: 1,3-benzenedicarboxylates, 4,4′-bipy: 4,4′-bipyridine) are obtained from the diffusion method. In 1, bdc2− ligand adopts μ2-η1,η1 coordination mode, while in 2, one of the two crystallographically independent bdc2− ligands is μ2-η1,η2 fashion, and the other one is similar to that in 1. The structure of 1 exhibits a 2-D square net and 2 features a 2-D interpenetrating herringbone-like structure. Both 1 and 2 show blue fluorescence owing to the photoluminescence from the bdc2− ligand emission.