Synthesis, characterization, and properties of four lanthanide-based coordination polymers with mixed ligands of 4-((4 '-carboxybenzyl)oxy)benzoic acid and oxalic acid

摘要

A series of lanthanide-based coordination polymers (Ln(2)(CBOB)(2)(OX)H2O, where Ln=Gd (1), Eu (2), Pr (3), and Tb (4); CBOB=4-[(4-carboxybenzyl)oxy]benzoate; OX=oxalate), were obtained from the reaction of H2OX, H2CBOB, and Ln(NO3)(3) with the metal salts. Single-crystal measurements show that both 1 and 2 feature unique 3-D structures with the [Ln(COO)(n)(C2O4)(m)] layers connected by CBOB ligands. Moreover, 1, 3, and 4 are antiferromagnetic and 2 and 4 display obvious luminescence emission peaks. Furthermore, quantum Monte Carlo (QMC) simulations and the experimental results reveal that the magnetic coupling parameters of adjacent Gd(III) ions in 1 are -0.026(2) and -0.0069(3) cm(1).