Abstract
The simple tripodal amine ligand Tris-[2-(naphthalen-1-yloxy)-ethyl]-amine ( L 1) was screened for anion recognition. Four crystal structures confirmed the inorganic as well as organic anion recognition in the solid state. Solid-state structures are results of supramolecular self-assembly and 3D molecular network involves C–H⋯O and C–H⋯ π bonding in the crystal lattice. In the solid state, it forms a strong C–H⋯Cl and C–H⋯O type interactions with the anions. This anion recognition was also confirmed by steady state fluorescence spectroscopy. In complex 4, L 1 is confined between 2D hydrogen bonded sheet formed by pyromellitic acid anion. L 1 shows unusually high selectivity toward nitrate in solution resulting in both a dramatic color change and a concomitant quenching of luminescence.
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