New Coordination Polymers of Lanthanide(III)with Tetrazole-1-acetic Acid:Synthesis,Crystal Structures,and Magnetic Properties

摘要

New coordination polymers {[Ln(tza)3(H2O)2]·mH2O}_n(Ln=La~(III)·1 and Pr~(III)2,m=2;Ln=Nd~(III)3,m=1.5)and {[Sm2(tza)6(H2O)5]·H2O}_n 4(Htza=tetrazole-1-acetic acid)have been synthesized and characterized by IR spectroscopy,elemental analysis,X-ray crystallography,and magnetic measurements.The Htza ligand coordinates to the lanthanide cations through the carboxylate group in a monodentate,bridging bidentate coordination mode or bridging tridentate to two metal centres.Complexes 1 and 2 are isostructural.Complex 3 has a similar structure to 1 and 2,but the arrangement of ligands has changed.Complex 4 consists of two types of metallic molecules.Magnetic measurements show weak antiferromagnetic coupling between the metal centres in complexes 2 and 3.