Two novel interpenetrating MOFs constructed from a derivative of phenanthroline and a V-shaped flexible dicarboxylate ligand contains unique chiral structure

Based on 1H-imidazo[4,5-f][1,10]-phenanthroline (IP), 4,4′-oxybis(benzoic acid) (H2oba), and two different metal salts, two novel complexes were hydrothermally constructed, {[Cd2(oba)2(IP)2(H2O)]·H2O}n (1) and {[Mn2(IP)4(oba)2]·(oba)(H2O)2}n (2). Complex 1 exhibits a rare 2D → 2D parallel interpenetration layer , which contains two same-hand chiral sheets with the P1¯ space group. Complex 2 contains 1D left-hand helical chain with the C2 space group. Meanwhile, the dissociate oba and water molecules are connected to be a right-hand helical chain via hydrogen bonds, and form a twofold-interpenetrating structure. In addition, the two compounds also exhibit good thermal stability.

Graphical abstractBased on IP, H2oba ligands and different metals, two novel complexes were hydrothermally constructed, {[Cd2(oba)2(IP)2(H2O)]·H2O}n (1), {[Mn2(IP)4(oba)2]·(oba)(H2O)2}n (2). In complex 1 two same chiral sheets exhibit rare 2D → 2D parallel interpenetration with the P1¯ space group. Complex 2 contains 1D left-hand helical chains and dissociated right-hand helical chains with the C2 space group. Two complexes exhibit good thermal stability.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Two complexes base on Cd and Mn and two different types of ligands. ► A rare 2D → 2D parallel interpenetration were found in complex 1. ► The good fluorescence properties were shown.