A series of coordination polymers assembled from 9,9-dimethylfluorene-2,7-dicarboxylic acid and various flexible bis(imidazole) ligands: synthesis, structures and properties

Abstract

Seven new coordination polymers, namely, [Co₂(mfda)₂(bip)(H₂O)₂]·2H₂O (1), [Zn₂(mfda)₂(bip)]·H₂O (2), [Co₂(mfda)₂(bib)(H₂O)] (3), [Zn₂(mfda)₂(bib)₂]·(DMF)₃·H₂O (4), [Zn₂(mfda)₂(bib)] (5), [Zn₂(mfda)₂(bite)] (6) and [Ni₄(mfda)₄(bite)₃(μ₂-H₂O)₂]·4H₂O (7) (H₂mfda = 9,9-dimethylfluorene-2,7-dicarboxylic acid, bip = 1,3-bis(imidazole)propane, bib = 1,4-bis(imidazole)butane and bite =1,4-bis(imidazole)butene), have been synthesized and structurally characterized. Compounds 1 and 3 feature a two-fold interpenetrating framework of pcu topology. Compound 2 exhibits a three-fold interpenetrating framework of pcu topology. Compound 4 displays a four-fold interpenetrating framework of dia topology. Compounds 5 and 6 exhibit a uninodal six-connected network with unusual acs topology. Compound 7 shows a uninodal eight-connected framework with CsCl topology. The luminescence properties of compounds 2, 4, 5 and 6 were also measured.