Self-assembly via intermolecular hydrogen-bonding between o-/m-/p-NH2 and BF2 groups on dipyrromethenes

The inductive release of electron density into a dipyrromethene moiety, coordinated to a BF2 group, from a phenyl group variously substituted by ortho- and para-amino groups resulted in relatively strong hydrogen-bonding, whereas the meta-analog formed only weak hydrogen-bonds.