Four lanthanide-carboxylate coordination polymers with mixed 2,3-naphthalenedicarboxylate and phen ligands: Syntheses, structures, luminescent and magnetic properties

Four new lanthanide-carboxylate coordination polymers of the formula [Ln(3)L(4)(phen)(4)(H2O)(4)](ClO4). 2H(2)O, (Ln = Dy (1), Tb (2), Ho (3) and Er (4); L = 2,3-naphthalenedicarboxylate and phen = 1,10-phenanthroline) were solvothermally synthesized. Their structures as well as magnetic and photoluminescent properties were completely investigated. Complexes 1-4 are isostructural and exhibit 1D ribbon-like chains with envelope-like sixteen-membered rings. The Dy-III and Tb-III complexes show the corresponding characteristic luminescence in the visible region and the Er-III complex shows luminescence in the near-infrared region upon excitation with UV rays. Studies on the magnetic properties are reported. The Dy(III) analog complex 1 exhibits slow magnetic relaxation and could be a new example of a Dy(III) SMM (single molecule magnet). (C) 2015 Elsevier Ltd. All rights reserved.