Download PDF
Synfacts 2008(12): 1277-1277  
DOI: 10.1055/s-0028-1087306
Synthesis of Materials and Unnatural Products
© Georg Thieme Verlag Stuttgart ˙ New York

Cu(I)/Cu(II) Fluorescence Switch

Contributor(s):Timothy M. Swager, Jose M. Lobez
K. K. Sadhu, P. K. Bharadwaj*
Indian Institute of Technology, Kanpur, India
Translocation of Copper Within the Cavity of Cryptands: Reversible Fluorescence Signaling
Chem. Commun.  2008,  4180-4182  
Crossref
Further Information

Publication History

Publication Date:
20 November 2008 (online)

 PDF Download Permissions and Reprints

Key words

fluorescence switch - cryptand ligands - photoinduced electron transfer

Significance

Translocation of copper within a cryptand ligand via oxidation/reduction reactions provides a new family of ON-OFF fluorescent systems.

Comment

Upon addition of Cu(II) to the thio-aza cryptands presented, the photoinduced electron transfer from the HOMO of the donor N-atom to the anthracene fluorophore is hindered, owing to complexation of the hard Cu(II) to the N4 part of the molecule. After reduction to Cu(I), the softer cation moves coordination sites, not hindering exciplex formation anymore, and the fluorescence of the monomeric anthracene decreases.

   Permissions and Reprints