Syntheses, structures and optical properties of a series of lanthanide complexes with chelidamic acid and 4,4′-bipyridyl

摘要

The title complexes, (C _(10)H _8N _2), [Y(C _7H _3NO _5) (C _7H _4NO _5)·2H _2O]·3H _2O (1), (C _(10)H _8N _2)· [Er(C _7H _3NO _5) (C _7H _4NO _5) ·2H _2O]·3H _2O (2), (C _(10)H _8N _2)· [La(C _7H _3NO _5) (C _7H _4NO _5)·2H _2O]·4. 5H _2O (3), (C _(10)H _8N _2)· [Sm(C _7H _3NO _5) (C _7H _4NO _5)·2H _2O]·4.75H _2O (4), (C _(10)H _8N _2)· [Pr(C _7H _3NO _5) (C _7H _4NO _5) ·2H _2O]·4.75H _2O (5) were synthesized and characterized by X-ray single-crystal diffraction. The crystal structures of 1-2 reveal that they are isomorphous, among which the metal atoms are all eight-coordinate with a distorted dodecahedron coordination geometry. The structures of 3-5 are isomorphic, among which the metal atoms are all nine-coordinate with distorted tricapped trigonal prismatic coordination geometries by two chelidamic acid ligands. Complexes 1-5 are formed into 3D networks by H-bonds. The optical properties of 1-5 were investigated in terms of fluorescent spectra, which all exhibit strong luminescence.