Four novel lanthanide coordination compounds based on amino acid derivative ligands: Construction, characterization and Spectral chirality recognition

Abstract

Four novel lanthanide coordination compounds, namely, [Eu2(bzgluO)3(phen)2]n·2nH2O (1); [Tb2(bzgluO)3(phen)2]n·2nH2O (2); [Eu2(tsgluO)3 (H2O)4]n⋅4nH2O (3); [Eu2(tsgluO)3(phen)2(H2O)]n⋅2nH2O (4); (H2bzgluO = N-Benzoyl-L-glutamic acid, H2tsgluO = (+)-N-Tosyl-L-glutamic acid, phen = 1,10-phenanthroline) have been successfully synthesized under hydrothermal conditions and structurally characterized by elemental analysis, IR spectroscopy, single-crystal X-ray diffraction analysis and powder X-ray diffraction. Lanthanide coordination compounds 1 and 2 crystallize in the orthorhombic space group P212121, they are isostructural and exhibit the 2D layer structures. Complexes 3 and 4 crystallize in the triclinic space group Pī, complex 3 features a 2D layer structure, complex 4 exhibits the 1D infinite double chain. It is worth noting that the amino acid derivative ligands adopt different coordination modes in the lanthanide coordination polymers to make the crystal structures diverse. Additionally, fluorescent properties study indicates that complexes 1 and 4 show characteristic transitions of Eu3+, and the complex 2 shows characteristic transitions of Tb3+. More significantly, complexes 1 and 2 can effectively detect the tyrosine enantiomers through the fluorescence spectrometry and UV–Vis spectroscopy.