Bismuth-MOF based on tetraphenylethylene derivative as a luminescent sensor with turn-off/on for application of Fe3+ detection in serum and bioimaging, as well as emissive spectra analysis by TRES

A novel MOF Bi-TCBPE ([Bi(TCBPE)(H2O)]center dot(Me2NH2+)) based on 4',4''',4 ''''',4 ''''''-(ethene-1,1,2,2-tetrayl)tetrakis (([1,1'-biphenyl]-4-carboxylic acid)) has been synthesized and characterized by elemental analysis, powder Xray diffraction, IR, UV-vis spectroscopy and thermogravimetry analysis, which exhibits strong emission (Phi(F) = 76.96%) in methanol suspension.The photophysical process was analyzed by TRES. Structural analysis revealed that Bi-TCBPE showed a novel two-fold interpenetrated packing framework. Luminescence measurements indicate that the Bi-TCBPE sensor shows sensing behavior with turn off towards Fe3+ and turn on towards Cysteine (Cys) significantly. Bi-TCBPE as a luminescent sensor displays quenching effect towards Fe3+ detection in the interference of Fe2+. It also can be used for the quantitative determination of Fe3+ in serum. The results will provide a great possibility for the practical application of luminescent metal organic frameworks (LMOFs) in clinical detection.