2D pillar-chained lanthanide(III)-copper(I) metal-organic frameworks based on isonicotinate and in situ generated oxalate

Three isostructural lanthanide complexes, [Ln(2)(H2O)(4)(DMSO)](CuI)(4)(Ina)(4)(ox)[HIna = isonicotinic acid; H(2)ox = oxalic acid; Ln = Pr(1), Sm(2), Eu(3)], have been synthesized under the solvothermal condition and characterized by single-crystal X-ray diffraction, X-ray powder diffraction (PXRD), thermogravimetric analysis (TGA) and elemental analysis (EA) and IR spectra. Complexes 1-3 present 2-D pillar-chained frameworks and consist of two distinct chain-like motifs of inorganic [Cu4I4](n) cluster chains and organic Ln-carboxyl-oxalic [Ln(2)(mu(2)-Ina)(2)(Ina)(2)(mu(2)-ox)](n) chains. The C-13 NMR of HIna indicates ox(2-) in 1-3 is generated by the in situ decomposition of HIna. Additionally, the photoluminescent properties of 1-3 are also discussed. (C) 2013 Elsevier B.V. All rights reserved.