Two new three-dimensional isostructural lanthanide metal organic frameworks (Ln(III)-MOFs), [LnL(H2O)(3)]center dot 3H(2)O center dot 0.75DMF (1-Ln; Ln = Dy(III) and Eu(III) ions, H3L = biphenyl-3'-nitro-3,4',5-tricarboxylic acid, DMF = N,N'-dimethylformamide), were synthesized and characterized. The appearance of temperature-dependent out-of-phase (chi ''(M)) signal reveals that complex 1-Dy displays slow magnetic relaxation behavior with the energy barrier (Delta U-eff) of 57 K and a pre-exponential factor (tau(0)) of 3.89 X 10(-8) s at 1200 Oe direct current field. The luminescence explorations demonstrated that 1-Eu exhibits high quenching efficiency and low detection limit for sensing nitrobenzene and Cr2O72-. Meanwhile, the fluorescence intensity of the quenched 1-Eu samples will be resumed after washing with DMF or water, indicating that 1-Eu may be used as a highly selective and recyclable luminescence sensing material for sensing nitrobenzene and Cr2O72- anion.