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Anion competition reaction showing selective nitrite capture by 1 in the presence of fluoride and nitrate (top), selectivity of hydrazine binding to 1 in the presence of 1-mono (middle) and 1H NMR of hydrazine competition experiment (bottom) (N-CH2 and pyz-CH shown). BR2 = 9-BBN and R represents the remainder of the free ligand.
