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

Three isostructural lanthanide complexes, [Ln2(H2O)4(DMSO)](CuI)4(Ina)4(ox)[HIna = isonicotinic acid; H2ox = 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 [Ln2(μ2-Ina)2(Ina)2(μ2-ox)]n chains. The 13C NMR of HIna indicates ox2 − in 1–3 is generated by the in situ decomposition of HIna. Additionally, the photoluminescent properties of 1–3 are also discussed.