Supramolecular control of fluorescence through reversible encapsulation.
The trans to cis isomerization of 4,4'-dimethylazobenzene by the nonchemical stimuli light and heat alters its guest binding properties, allowing control over encapsulation of a second guest. We show here how this remote control for reversible encapsulation can be used as a supramolecular fluorescence on/off switch. If trans-4-ethyl-4'-methylstilbene is used as the second guest its fluorescence is altered depending on whether it is free in solution or encapsulated. We demonstrate that the change in fluorescence is indeed a consequence of the controlled encapsulation state of the stilbene by correlation of fluorescence and (1)H NMR data.
Dube
Henry
H
Department of Chemistry, Allegheny College, 520 North Main Street, Meadville, Pennsylvania 16335-3902, USA.
Ams
Mark R
MR
Rebek
Julius
J
D001391:Azo Compounds / Q000737:chemistry; D006358:Hot Temperature; D008027:Light; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D008968:Molecular Conformation; D013050:Spectrometry, Fluorescence / Q000379:methods*; D013237:Stereoisomerism; D013267:Stilbenes / Q000737:chemistry*; D013343:Styrenes / Q000737:chemistry
D001391:Azo Compounds; D013267:Stilbenes; D013343:Styrenes; C027142:vinyltoluene; C009850:azobenzene