Add time:07/18/2019         Source:sciencedirect.com

One bis-imidazolium salt 2,2′-di[2’’-(N-methyl-imidazoliumyl)ethoxyl]azobenzene hexafluorophosphate (LH2·(PF6)2) and its macrometallocycle binuclear N-heterocyclic carbene silver(I) complex [(LAg)2](PF6)2 were prepared and characterized. The structure of [(LAg)2](PF6)2 was determined by X-ray single crystal diffraction, 1H NMR and 13C NMR spectroscopy. In complex [(LAg)2](PF6)2, one 34-membered macrometallocycle was formed by two biscarbene ligand L and two silver(I) ions. Additionally, the selective recognition of hydrogen sulfate using [(LAg)2](PF6)2 as a chemosensor was investigated on the basis of fluorescence titrations, ultraviolet titrations, 1H NMR titrations, HRMS and IR spectra. Complex [(LAg)2](PF6)2 was demonstrated to be an effective chemosensor for hydrogen sulfate.

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