We have reported the efficient binding behaviours of a series of dipyrrolyldiketone boron complexes with acetate as one of the representative carboxylate anions. 5,6 The binding constants for acetate are higher than those for Cl − and Br − , presumably because of the basicity of the anion and the multiple hydrogen bonding interactions between the pyrrole NH and acetate oxygen. The binding modes of anion receptors for carboxylates have been investigated in detail by 1 H ...
