3-D frameworks assembled by lanthanide dimers with 1,4-cyclohexanedicarboxylic acid and 1,10-phenanthroline <i>via</i> hydrogen bonds and π–π stacking interactions

Abstract

Two complexes [Ln(e,a-cis-1,4-chdc)(e,a-cis-1,4-Hchdc)(phen)(H2O)]2⋅10H2O (Ln = Eu, 1; Tb, 2, 1,4-H2chdc = 1,4-cyclohexanedicarboxylic acid; phen = 1,10-phenanthroline) have been synthesized and structurally characterized by single-crystal X-ray diffraction. Both complexes are doubly e,a-cis-1,4-chdc-bridged dimers. The e,a-cis-1,4-Hchdc, phen, and water molecules bond to Ln3+, forming nine-coordinate complexes. 3-D supramolecular frameworks are constructed by hydrogen bonds and π–π stacking interactions. Luminescence spectra exhibit the 5D0 → 7F J (J = 0–4) and 5D4 → 7F J (J = 6–3) transitions of Eu3+ for 1 and Tb3+ ion for 2, respectively.