A new halogen bonding 1, 2-iodo-triazolium-triazole benzene motif for anion recognition. (15th November 2021) - Bunchuay, Thanthapatra
Graphical abstract: A series of halogen bonding (XB) acyclic anion receptors based on a novel 1, 2-iodo-triazolium-triazole benzene motif is reported. The halide anion recognition properties of this new XB donor array are investigated by a suite of techniques including; one- and two-dimensional 1 H and 19 F NMR spectroscopy and X-ray crystal structure analysis. Abstract: The synthesis of a series of halogen bonding (XB) acyclic anion receptors based on a novel 1, 2-iodo-triazolium-triazole benzene motif is reported. A combination of one- and two-dimensional 1 H and 19 F NMR spectroscopic techniques elucidate key conformational effects associated with the incorporation of ortho -substituted iodo-triazole based XB donors. 1 H NMR anion titration experiments highlight the anion recognition potency of a mono-cationic XB iodo-triazolium-triazole benzene receptor, remarkably forming stronger halide complexes in comparison to a dicationic hydrogen bonding (HB) bis-proto-triazolium receptor analogue. X-ray crystal structure analysis provide insights into halide binding induced conformational changes and coordination modes, revealing the unique electronic and steric consequences associated with multidentate XB donor arrays.