Design and characterization of silver(I) azide coordination polymers based on 1,2-bis(4-pyridyl)ethane and phenazine

Abstract

Two silver(I) azide supramolecular coordination polymers (SCPs) with N-donor ligands have been synthesized and structurally characterized by physicochemical and spectroscopic methods; [AgN3.bpe] where bpe = 1,2-bis(4-pyridyl)ethane, 1, and [(AgN3)2.phenz], 2, where phenz = phenazine. Syntheses were carried out in H2O/acetonitrile/NH3 media at room temperature. The topology of the bipodal ligands directs the silver azide building blocks to adopt different structures; 1D-chain, 1, or 1D-ribbon, 2. The azide groups exhibit an unusual bent structure with increasing bridging capability to adopt enough space for the bipodal ligands. The structure of SCP 2 contains the cyclic motif {Ag2(μ3-N3)2} to accommodate the voluminous phenz ligand. The emission spectra of the SCPs 1 and 2 display emission bands at 400–650 nm.