Two new three-dimensional metal–organic frameworks constructed from a semirigid V-shaped ligand with luminescent and topology studies

Two new compounds [Zn2L(OH)H2O]n (1) and [Cd(HL)]n (2) have been assembled from a semirigid V-shape ligand under hydrothermal conditions. The two compounds were determined by single-crystal X-ray diffraction analyses and further characterized by solid state emission spectra, IR spectra, and thermogravimetric analyses. Single crystal X-ray diffraction analyses show that both of the two compounds crystallize in space group P1¯ and display a three-dimensional (3D) structure with different topologies of fluorite topology for 1 and Au4Ho topology for 2. It is noteworthing that 1 has a novel Zn2 dinuclear unit containing only one bridging oxygen atom between two Zn atoms. Studies of photophysical properties reveal that 1 and 2 present luminescence, which can be ascribed to the emission of intraligand transition.

Using ligand 5-(4′-(tetrazol-5″-yl)phenoxy) isophthalic acid, two new 3D coordination polymers, [Zn2L(OH)H2O] (1) and [Cd(HL)] (2), have been synthesized. Compound 1 is a 3D fluorite network. Compound 2 possesses a 3D Au4Ho topology.Figure optionsDownload as PowerPoint slideHighlights
► New compounds 1 and 2 are based on 5-(4′-(tetrazol-5″-yl)phenoxy) isophthalic acid.
► Compound 1 is a 3D network with fluorite topology.
► In compound 1, zinc adopts a novel dinuclear mode.
► Compound 2 possesses a 3D framework with Au4Ho topology.
► Luminescence can be ascribed to the emission of intraligand transition.