Two Zinc(II)/Cadmium(II) Coordination Polymers Constructed by Semirigid Carboxylic Acid Ligand: Syntheses, Structures, and Photoluminescence Properties

Abstract

Two new coordination polymers {[Zn(HL)(HBpp)] · H₂O}_n (I) and [Cd(HL)(HBpe)]_n (II) (H₄L = 5-(2,3-dicarboxy phenoxy) isophthalic acid, Bpp = 1,3-bis(4-pyridyl)propane, Bpe = 1,2-bis(4-pyridyl)ethylene) were prepared and characterize by element analysis, powder XRD and single crystal X-ray diffraction (CCDC nos. 1836060 (I), 1844999 (II)). The single-crystal X-ray diffractions reveal that the complex I is a 2D carboxylate layer with the HBpp suspension arms, in which the zinc(II) is four-coordinated with a tetrahedral geometry. Compound II is a 1D Cd(II)-carboxylate chains, in which the cadmium(II) is seven-coordinated with a distorted pentagonal bipyramidal geometry. Complexes I and II are further extended into three-dimensional supramolecular framework via hydrogen bonds. The solid state luminescent properties of compounds I and II have been investigated.