Two Coordination Polymers Constructed from Pillared M–O (M= Na+or Ba2+) Subunits with 3‐Formyl‐4‐hydroxybenzenesulfonic Acid as Ligand

Two new coordination polymers, [Na(H2L)(H2O)2]n(1) and [Ba(H2L)2(H2O)]n(2) (H3L = 3‐formyl‐4‐hydroxybenzenesulfonic acid) were synthesized and structurally characterized. The H2L–ligand shows three different bridging modes, μ3in 1, μ3and μ4in 2. Compound 1presents a 2D pillared structure, whereas 2forms a 3D framework. Both 1and 2show blue luminescence at 380 nm in aqueous solution, however, their solid state emissions are at 406 and 446 nm, respectively.