A Two-Dimensional Layered Cadmium Polymer Featuring Cd4(μ-O)4 Cores and Fluorescent Emission

Abstract

A cadmium coordination complex featuring novel Cd₄(μ-O)₄ cores, [Cd₂(Hbna)(opy)(H₂O)₂] (1) (H₄bna=2,2′-dihydroxy-[1,1′]-binaphthalene-3,3′-dicarboxylate acid; Hopy=1H-pyridine-2-one), has been hydrothermally synthesized and characterized. The Hbna ligand here acts in an unprecedented chelating/tridentate coordination mode for two carboxy groups with an additional μ-O-bridging coordination mode for the ortho-hydroxy oxygen atom. A study of the physical properties of solid (1) at room temperature demonstrates that it exhibits a moderately strong fluorescent emission in the blue-green region (about 538 nm), which can be assigned to LMCT emission.