Abstract
•X-ray crystallographic analysis of a new Zn(II)-based metal-organic framework (MOF).•Structural analysis reveals the formation of 2D square-grid framework with (4,4) net topology.•In situ cis-trans isomerization of cis,cis- muconate ligand in visible light.•The compound reveals photoluminescence property as examined by fluorescence spectroscopy.
A Zn(II) based two-dimensional (2D) metal-organic framework (MOF) [Zn3(cis,trans-muco)3(4,4′-bpy)3]·4H2O (1) has been synthesized by slow diffusion method using cis,cis-muconic acid (H2cis,cis-muco) and 4,4′-bipyridine (4,4′-bpy) mixed ligands. The synthesized compound 1 has been structurally characterized by single crystal X-ray diffraction (SCXRD), powder X-ray diffraction (PXRD) techniques, and thermogravimetric analysis (TGA). The solid-state structure of 1 reveals in situ cis,cis- to cis, trans- isomerization of muconate ligand under visible light, which predominately coordinates to Zn(II). The compound 1 comprises binuclear Zn2 secondary building units (SBUs) which propagate in ab plane to furnish 2D framework with (4,4) net topology. Interestingly, compound 1 shows photoluminescence property and can be used as luminescent probe. The non-covalent interactions within the compound 1 have been investigated by means of Hirshfeld surface analysis.
A Zn(II) based two-dimensional (2D) metal-organic framework (MOF) [Zn2(cis,trans-muco)2(4,4′-bpy)2]·4H2O has been synthesized by slow diffusion technique. The synthesized material has been structurally characterized by single crystal (SCXRD), powder X-ray diffraction techniques (PXRD), and thermogravimetric analysis (TGA). Here, cis,cis-muconate ligand has been transformed into a cis,trans-muconate ligand prior to the formation of MOF. This is quite unanticipated because no cis,trans-muconate was introduced in the reaction, and the starting material used cis,cis-muconic acid was pure. To the best of our knowledge, no such example was reported for cis,trans transformation of cis,cis-muconate ligand in the synthesis of MOFs. The photoluminescence of the compound has also been studied. [Display omitted]