From racemic compound to spontaneous resolution: A series of homochiral lanthanide coordination polymers constructed from presynthesized [Sb2(tart)2]2− metalloligands

A series of homochiral 1D lanthanide coordination polymers, namely {Ln(H2O)5(NO3)[Sb2(d-tart)2]}·H2O (Ln = Ce (1), Eu (5)) and {Ln(H2O)5(NO3)[Sb2(l-tart)2]}·H2O (Ln = Pr (2), Nd (3), Sm (4), Dy (6)) (tart = tartaric acid) were obtained by spontaneous resolution from presynthesized racemic [Sb2(tart)2]2− metalloligands (MLs). Their structures were determined by single-crystal X-ray diffraction analyses and further characterized by elemental analyses, IR spectra, X-ray powder diffraction, and TG analyses. Compounds 1–6 are isostructural and feature novel 1D homochiral chains. There are three types of hydrogen-bonded helices in the 3D supramolecular network of 1–6. This case is still rare in metal–organic complexes. In addition, the luminescent properties of 4–6 were studied in the solid state at room temperature.