カチオン性Pd2L4 hostとキノンtypeゲストのBinding
Abstract
Guest encapsulation underpins the functional properties of self-assembled capsules yet identifying systems capable of strongly binding small organic molecules in solution remains a challenge.
Most coordination capsules rely on the hydrophobic effect to ensure effective solution-phase association.
In contrast, we show that using non-interacting anions in apolar solvents can maximize favorable interactions between a cationic Pd2L4 host and charge-neutral guests resulting in a dramatic increase in binding strength.
With quinone-type guests, association constants in excess of 108 m−1 were observed, comparable to the highest previously recorded constant for a metallosupramolecular capsule.
Modulation of optoelectronic properties of the guests was also observed, with encapsulation either changing or switching-on luminescence not present in the bulk phase.