Synthesis 2011(14): 2334-2339  
DOI: 10.1055/s-0030-1260670
PAPER
© Georg Thieme Verlag Stuttgart ˙ New York

Bis(4-hydroxythiazoles): Novel Functional and Switchable Fluorophores

Eric Täuschera, Lorena Calderón-Ortiza, Dieter Weiß*a, Rainer Beckert*a, Helmar Görlsb
a Institute of Organic and Macromolecular Chemistry, Friedrich-Schiller-University Jena, Humboldtstr. 10, 07743 Jena, Germany
Fax: +49(3641)948212; e-Mail: C6bera@uni-jena.de;
b Institute of Inorganic and Analytical Chemistry, Friedrich-Schiller-University Jena, Lessingstr. 8, 07743 Jena, Germany
Further Information

Publication History

Received 31 March 2011
Publication Date:
16 June 2011 (online)

Abstract

A series of 2,2′- and 5,5′-bis(4-hydroxythiazoles) was synthesized according to Hantzsch synthesis. Both phenols and their corresponding anions display a strong fluorescence in the visible spectrum, whereas the emission is shifted bathochromically upon deprotonation. This easy switch makes them suitable for widespread applications, mainly in analysis and supramolecular chemistry. Due to their 1,4-diazadiene substructure, the 2,2′-bithiazoles possess prerequisites for the complexation of metals, however, instead of a copper complex, a dimer which constitutes the 5,5′-C-C coupled product was isolated. In addition, tris(thiazoles) could be constructed.

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Supporting Information Available: Crystallographic data deposited at the Cambridge Crystallographic Data Centre under CCDC-813194 for 4a, and CCDC-813195 for 16 contain the supplementary crystallographic data excluding structure factors; this data can be obtained free of charge via www.ccdc.cam.ac.uk/conts/retrieving.html, or from the Cambridge Crystallographic Data Centre, 12, Union Road, Cambridge CB2 1EZ, UK; fax: +44(1223)336033; or deposit@ccdc.cam.ac.uk.