New examples of d10 metal–organic frameworks based on 4,4′-(hexafluoroisopropylidene)diphthalic acid: Synthesis, crystal structure and luminescence

•Two Cd/Zn coordination polymers with 4,4′-(hexafluoroisopropylidene) diphthalic acid and N-donor ligands.•1 displays a 2D network structure built from tetranuclear zinc unit.•2 possess an unprecedented 3D structure containing 1D parallelogram channels.•The (hfpd)4− ligand shows three different coordination modes and configuration.

Two novel coordination polymers, [Zn4(hfpd)2(phen)4(H2O)4]n (1), {[Cd2(hfpd)(bpy)(H2O)]·H2O}n (2) (phen = 1,10-phenanthroline, bpy = 4,4′-bipyridine, H4hfpd = 4,4′-(hexafluoroisopropylidene) diphthalic acid), were synthesized and characterized by elemental analyses, FT-IR spectra, single-crystal X-ray diffraction analyses, TGA, powder XRD and fluorescent measurements. Compound 1 shows a 2D network structure built from tetranuclear zinc unit interconnected by (hfpd)4− ligands. The adjacent networks are further packed into 3D supramolecular structure through π⋯π interactions. 2 possess an unprecedented 3D structure containing 26-number circles and 1D parallelogram channels. Especially the (hfpd)4− ligands in 1–2 adopt three different conformations and coordination modes. In addition, the thermal stability and photoluminescence properties of 1–2 were also studied.

Graphical abstractTwo novel d10 metal–organic frameworks were synthesized and characterized. 1 shows a 2D network structure built from tetranuclear zinc unit. 2 possess an unprecedented 3D structure containing 1D parallelogram channels. Especially the (hfpd)4− ligands in 1–2 adopt three different conformations and coordination modes. In addition, the thermal stability and luminescence properties of 1–2 were also studied.Figure optionsDownload full-size imageDownload as PowerPoint slide