1.
J Am Chem Soc
; 137(22): 7043-6, 2015 Jun 10.
Article
in English
| MEDLINE
| ID: mdl-26019001
ABSTRACT
Phthalein dyes in the quinone dianion form (pseudo-D3, colored) are transformed into the lactone dianion form (pseudo-T(d), colorless) through encapsulation in a T(d)-symmetric host even under basic conditions (pH â¼10). The compatibility in size and symmetry between the lactone and the cavity is essential to the transformation. Upon addition of a guest that strongly binds to the cavity, the encapsulated phenolphthalein is expelled, the color of the basic solution is regained, and the host-guest complexation is thus visualized.