The self-complexing macrocycle 4.4PF(6) has been shown to behave as a
chromophoric receptor for the 1,5-dioxynaphthalene derivative 3, which
is able to displace the hydroquinone ring out from the cavity of the
self-complexing macrocycle 4.4PF(6) and in so doing produces a 1:1 com
plex. This process is accompanied by an alteration in the UV/Vis absor
bance which is reflected in a change in the colour of the solution - f
rom red to purple. (C) 1997 Elsevier Science Ltd.