Syntheses, crystal structures, and luminescence of two lanthanide coordination polymers based on 5-(3′,4′-bis(tetrazol-5″-yl)phenoxy)isophthalic acid and 1,10-phenanthroline

Abstract

Two new lanthanide coordination polymers, [Ln(btpa)(phen)2(OH)]n·nH2O (Ln= Tb 1, Pr 2) (H2btpa=5-(3′,4′-bis(tetrazol-5″-yl)phenoxy)isophthalic acid, phen=1,10-phenanthroline), have been successfully synthesized and structurally characterized by elemental analyses, IR spectroscopy, single-crystal X-ray diffraction, TGA and powder X-ray diffraction analyses. Coordination polymers 1–2 are isomorphism structures, showing a 1D chain bearing hooks structure. LnⅢ ion in 1−2 adopt nine-coordinated mode to construct a tricapped trigonal prism configuration. The adjacent chains form a 2D supramolecular network via π … π stacking interactions between the pyridine rings of phen ligands. Then the neighbouring 2D supramolecular networks recognizing each other form a 3D supramolecular structure through π … π interaction between benzene rings of (btpa)2− ligands. The luminescence experiments show that TbIII complex exhibits typical metal-centered emissions in the visible region in the solid state.