Lanthanide Metalloligand Strategy toward d-f Heterometallic Metal-Organic Frameworks: Magnetism and Symmetric-Dependent Luminescent Properties

On the basis of lanthanide metalloligands, [Ln-(ODA)(3)](3-) (H(2)ODA = oxydiacetic acid), three series of d-f heterometallic metal-organic frameworks, {[Co(H2O)(6)]center dot[Ln(2)(ODA)(6)Co-2]center dot 6H(2)O}(n) [1; Ln = Gd (1a), Dy (1b), and Er (1c)], {[Ln(2)(ODA)(6)Cd-3(H2O)(6)]center dot mH(2)O}(n) [2; Ln = Pr (2a), Nd (2b), Sm (2c), Eu (2d), and Dy (2e), m = 9, 6, or 3], and {[Cd(H2O)(6)]center dot[Ln(2)(ODA)(6)Cd-2]center dot mH(2)O}(n) [3; Ln = Dy (3a), Ho (3b), Er (3c), Tm (3d), and Lu (3e), m = 6 or 12], were designed and synthesized by a solvent volatilization and hydrothermal method. Magnetic investigation of 1 reveals the ferromagnetic interactions between the metal ions. In 2, Ln(III) ions occupied the inversion centers, which are confirmed by the fact that the emission intensity ratio of 5D(0) -> F-7(1) to D-5(0) -> F-7(2) of the Eu-III ion.