Unusual double layer coordination polymers constructed from metal(II)-3-fluorophthalate helices and M–tib honeycom layers (tib = 1,3,5-tris(1-imidazolyl)benzene)

Two coordination polymers, [M(Fpht)tib]·H2O (M = Cd 1, Co 2; H2Fpht = 3-fluorophthalic acid and tib = 1,3,5-tris(1-imidazolyl)benzene) have been synthesized and structurally characterized by single crystal X-ray diffraction. They possess unusual double layer structures constructed from M–Fpht helices and (3, 3) M–tib honeycom layers. The fluorescence of the complexes maybe arise from the intraligand π⁎–π transition.

Graphical abstractTwo coordination polymers, [M(Fpht)tib]•H2O (M = Cd 1, Co 2; H2Fpht = 3- fluorophthalic acid and tib = 1,3,5-tris(1-imidazolyl)benzene) have been synthesized and structurally characterized. They possess unusual double layer structures constructed from M-Fpht helices and (3, 3) M-tib honeycom layers.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Unusual 2D double layer structure is constructed from Cd(II)/Co(II) ions with 3-fluorophthalic acid (H2Fpht) and 1,3,5-tris(1-imidazolyl)benzene) (tib). ► Each tib ligand connects three M(II) ions and each M(II) ion connects three tib ligands to generate an (3, 3) M–tib honeycom layer. ► M(II) ions are linked together by the Fpht ligands to form M–Fpht right- and left-handed helical chains. ► 3D supramolecular network is formed by C―H…π or π…π interaction.