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The new charge neutral 4-amino-1,8-naphthalimide based anion sensors 2 and 3 bind to both acetate and dihydrogenphosphate with 1:1 stoichiometry through hydrogen bonding to both thiourea N–H atoms and in the case of dihydrogenphosphate, the naphthalimide 4 amino N–H group as well. This was clearly established from 1 H NMR titration experiments with H2PO4- in DMSO-d 6 where a substantial...
The 4-amino-1,8-naphthalimide-based anion receptor 3 binds dihydrogenphosphate with 1:1 stoichiometry through cooperative hydrogen bonding to a naphthalimide N–H and thiourea N–H groups. This was clearly established from 1 H NMR titration experiments in DMSO-d 6 where a substantial shift in the resonance for the naphthalimide N–H was observed concomitant with the expected thiourea...
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