Dual-ligand approach to synthesize a new 3-D heterometallic framework consisting of dysprosium–carboxyl belt and inorganic copper–iodine chain

Abstract

A novel three-dimensional (3-D) Dy(III)–Cu(I) heterometallic polymer, [Dy 2 (pca) 2 (npa) 2 (H 2 O) 3 ](Cu 2 I 2 ) ( 1 , pca = 2-pyrazinecarboxylic acid, npa = 1,8- naphthalenedicarboxylic acid), has been synthesized by hydrothermal reactions of Dy 2 O 3 , CuI, 2-pyrazinecarboxylic acid, 1,8-naphthalene anhydride in water in the presence of HClO 4 . Compound 1 has been characterized by elemental analysis, infrared spectroscopy, powder X-ray diffraction and single-crystal X-ray diffraction analysis, respectively. The thermal stability and luminescence property of compound 1 have also been studied. Single crystal X-ray diffraction analysis reveals that compound 1 contains two distinct units of 1-D Dy–carboxyl belt and Cu–I chain. The two types of 1-D units are further linked via pca ligands to give a heterometallic Dy–Cu framework. A novel three-dimensional (3-D) Dy–Cu heterometallic polymer 1 contains two distinct units of 1-D Dy–carboxyl belt and Cu–I chain. The two types of 1-D units are further linked via pca ligands to give a heterometallic Dy–Cu framework. The two different types of 1-D building units are rarely observed in the reported heterometallic framework. • Compound 1 is a 3-D Dy–Cu heterometallic framework. • Compound 1 contains two distinct units of 1-D Dy–carboxyl belt and Cu–I chain. • Compound 1 is synthesized by dual-ligand approach.