Torsionally Restricted Tetradentate Fluorophore: A Swivelling Ligand Platform For Ratiometric Sensing Of Metal Ions

摘要

A conformationally pre-organized ligand platform allows for restricted swivelling motions of two aryleneethynylene-appended 2,2 -hipyridyl units that function as a tight bischelator as well as a ratiometric fluorescence sensor for selected metal ions.rnCross-conjugated electronic structures continue to attract significant research interests in organic materials chemistry. Molecular cruciforms represent one such architectural motif. Spatial separation of the frontier molecular orbitals (FMOs) along each linear segment of such two-dimensional (2-D) constructs provides unique opportunities to control optoelectronic properties either through covalent modification of π-conjugated backbones or by interaction with chemical input signal.