Four novel metal-organic frameworks,[Cu2Cl2(pyrz)] (1) and (H(2)pip)(n)[Ln(2)(pydc)(4)(H2O)(2)]n (Ln=Ce (2), Pr (3) and Eu (4), H(2)pzdc=2,3-pyrazinedicarboxylic acid, pyrz=pyrazine, H(2)pydc=2,6-pyridinedicarboxylic acid, H(2)pip=piperazine) have been synthesized under hydrothermal conditions and characterized by the elemental analysis, ICP, Far IR (FIR), FT-IR spectra, TGA, single crystal X-ray diffraction analysis and powder X-ray diffraction (PXRD). Compound 1 is two-dimensional containing CI-Cu-CL sites, while the lanthanide complexes contain one-dimensional infinite Ln-O-Ln chains. All the complexes show high thermal stability. The complexes 1-3 exhibit luminescence emission bands at 584, 598 and 614 nm at room temperature when excited at 300 nm. Complex 4 exhibits bright red solid-state phosphorescence upon exposure to UV radiation at room temperature. (C) 2015 Elsevier Inc. All rights reserved.