A 3-D metal-organic framework constructed with cobalt(II), 1,3-di(4-pyridyl)propane (bpp) and 3,5-dinitrobenzoate (DNBA) with methyl-3,5-dinitrobenzoate (MDNBA) by in-situ synthesis as a guest

A new 3-D cobalt(II) mixed ligand, metal-organic framework {[Co2(bpp)2(DNBA)4H2O] · MDNBA} (1), (bpp = 1,3-di(4-pyridyl)propane, DNBA = 3,5-dinitrobenzoate and MDNBA = methyl-3,5-dinitrobenzoate) was synthesized in aqueous-methanol medium. X-ray structural analysis of 1 revealed that the dinuclear cobalt clusters interlinked by two μ-carboxylates and a μ 2 water molecule, acting as a node, are connected to four other clusters through bridging bpp to generate an extended neutral 3-D network. MDNBA was in-situ synthesized and encapsulated in the framework as a guest molecule. Moreover, the fluorescence spectrum shows 1 exhibits blue fluorescent emission in the solid state at room temperature.