Synthesis, structures and properties of two new chiral rare earth-organic frameworks constructed by L/D-tartaric acid

Hydrothermal reactions of rare earth cerium with L- or D- tartaric acid afford a pair of novel chiral enantiomer coordination polymers, namely, [Ce(L-tart)(CH2OHCH2OH)(H2O)]Cl (L-1) and [Ce(D-tart) (CH2OHCH2OH)(H2O)]Cl (D-1). Their structures were determined by single crystal X-ray diffraction analyses and further characterized by elemental analyses, XRD, IR spectra, and TG analyses. The circular dichroism (CD) spectra and second-harmonic generation (SHG) efficiency measurements proved that they are of structural chirality in the bulk samples. To the best of our knowledge, the enantiomers of L-1 and D-1 are the first 2D chiral dilayer frameworks constructed from L/D-tartrate ligands, ancillary ligand ethanediol and lanthanide ion Ce. (C) 2015 Elsevier Inc. All rights reserved.