Synthesis, fluorescence, and magnetic characterization of nicotinic acid ligand-based dysprosium, holmium, erbium, and thulium complexes

Four isomorphic rare earth complexes [M(Hcpna)(cpna)(H2O)(3)](n), where M=Dy (1), Ho (2), Er (3), Tm (4), have been synthesized by a solvothermal method based on 5-(4-carboxyphenoxy)nicotinic acid ligand (H(2)cpna) and rare earth metal ions Dy3+, Ho3+, Er3+, and Tm3+. Single crystal X-ray diffraction analyses reveal that complexes 1, 2, 3, and 4 are isostructural, and the structures are all 1D chain structures. The complexes were characterized by IR, elemental analysis, and powder X-ray diffraction, while the fluorescence and magnetic properties of the complexes were studied. The fluorescence test results show that the fluorescence intensity of complexes 1-4 were all lower than that of the H(2)cpna ligand. The magnetism of complexes 1-4 were studied in the 2-300 K range at 1 kOe dc field. The chi T-m values of complexes 1, 2, 3, and 4 were 14.04, 14.15, 11.08, and 6.83 cm(3)center dot mol(-1)center dot K respectively at room temperature. CCDC: 2151711, 1; 2112781, 2; 2112782, 3; 2112783, 4.