Two 2D metal-organic frameworks containing flexible bis(benzimidazole) derivatives for selective sensing of acetylacetone and Fe3+ ions

Two new metal-organic frameworks (MOFs), {[CO2(L)(2)(OBA)2]center dot 3H(2)O}(n) (1) and {Zn(L)(OBA)]center dot H2O}(n) (2) were constructed via N-donor and dicarboxylic acids co-ligands (L = 1,3-bis(5,6-dimethylbenzimidazol-1-yl)-2-propanol and H(2)OBA = 4,4'-oxybisbenzoic acid) under hydrothermal conditions and characterized by physicochemical and spectroscopic methods. Two MOFs display 2D layers that are simplified as sq1 networks. 2 is further extended to 3D supramolecular framework via pi-pi stacking interactions. 1 and 2 feature high thermal and pH stability. Finally, both MOFs can serve as luminescence probes for sensing of acetylacetone and Fe3+ ions, the related sensing mechanisms are discussed in detail.

Automated summary

Two new metal-organic frameworks (MOFs) were synthesized under hydrothermal conditions, showing high thermal and pH stability and serving as luminescence probes for sensing acetylacetone and Fe3+ ions.