Hydrothermal synthesis, structure characterization and luminescence property of three porous coordination polymers using a flexible tripodal amide containing linker

Use of a C3-symmetric facial ligand N,N’,N”-tris(3-pyridyl)-1,3,5-benzenetricarboxamide (L1), three porous MOFs, [CdCl2(aas-L1)]n (1), [HgI2(sss-L1)]n (2) and [CoCl2(ass-L1)(EtOH)]2 (3), were obtained under solvothermal conditions. Complex 1 exhibits a fascinating 2D two interwoven nets consisting of sandwich-like channels. Compound 2 shows an infinite 1D polymeric chain in herringbone fashion running along a-axis. The hydrogen-bonding interactions further link the molecules into 2D extended structure with 48-membered macrocycles. In the binuclear complex 3, two metal centers are bridged by two ligands, producing a 28-membered ring. The macrocyclic subunits further self-assemble into an open-framework structure with porous system via the hydrogen-bonding interactions. Furthermore, the luminescence properties of these compounds have been studied.

Three porous MOFs have been hydrothermally synthesized via the reaction of a C3-symmetric facial ligand L1 and MX2 (M = Cd, Hg and Co) under different temperature. Sing crystal X-ray diffraction revealed that complex 1 exhibits a fascinating 2D two interwoven nets consisting of sandwich-like channels. Compounds 2 shows an infinite 2D extended structure with 48-membered macrocycles via the hydrogen-bonding interactions. However, Complex 3 exhibits an open-framework structure with 28-membered macrocycles. The luminescence properties of them were also investigated at room temperature in the solid state.Figure optionsDownload as PowerPoint slideHighlights
► Three MOFs based on a C3-symmetric triangular facial ligand have been synthesized.
► Complex 1 exhibits 2D two interwoven nets with unique (3,4,6)-connected topology.
► Hydrogen bonding interactions are driving force for the construction of MOFs.
► Coordiantion polymers 1 and 2 possess strong luminescence.