A 12-Connected [Y((-OH)] Cluster-Based Luminescent Metal-Organic Framework for Selective Turn-on Detection of F in HO.

Fluoride ion (F) is one of the most hazardous elements in potable water. Over intake of F can give rise to dental fluorosis, kidney failure, or DNA damage. As a result, developing affordable, equipment-free and credible approaches for F detection is an important task. In this work, a new three dimensional rare earth cluster-based metal-organic framework assembled from lanthanide Y(III) ion, and a linear multifunctional ligand 3-nitro-4,4'-biphenyldicarboxylic acid, formulated as {[Y(-OH)][Y(-OH)(-HO)(HO)][-nba]} (), where Hnba = 3-nitro-4,4'-biphenyldicarboxylic acid, has been hydrothermally synthesized and characterized through infrared spectroscopy (IR), elemental and thermal analysis (EA), power X-ray diffraction (PXRD), and single-crystal X-ray diffraction (SCXRD) analyses. X-ray diffraction structural analysis revealed that crystallizes in tetragonal system with 4¯2 space group, and features a 3D framework with 1D square 18.07(3) Å channels running along the [0,0,1] or -axis direction. The structure of is built up of unusual eight-membered rings formed by two types of {YO} clusters connected to each other via 12 -nba and 4 -OH ligands. Three crystallographic independent Y ions display two coordinated configurations with a seven-coordinated distorted monocapped trigonal-prism (YO) and an eight-coordinated approximately bicapped trigonal-prism (YO). is further stabilized through O-H⋯O, O-H⋯N, C-H⋯O, and π⋯π interactions. Topologically, MOF can be simplified as a 12-connected 2-nodal topology with a Schläfli symbol {4·6·8}{4} or a 6-connected uninodal topology with a Schläfli symbol {4·6}. The fluorescent sensing application of was investigated to cations and anions in HO. exhibits good luminescence probing turn-on recognition ability toward F and with a limit detection concentration of F down to 14.2 μM in aqueous solution ( = 11403 M, = 0.99289, = 0.0539). The findings here provide a feasible detection platform of LnMOFs for highly sensitive discrimination of F in aqueous media.