New sensitizer-modified calix [4] arenes enabling near-UV excitation of complexed luminescent lanthanide ions

FJ Steemers, W Verboom, DN Reinhoudt… - Journal of the …, 1995 - ACS Publications
FJ Steemers, W Verboom, DN Reinhoudt, EB van der Tol, JW Verhoeven
Journal of the American Chemical Society, 1995ACS Publications
The synthesis is described of a series of calix [4] arenes with three different sensitizer
chromophores (“antenna”) attachedto the lower rim via a short spacer. In the Eu3+ and Tb3+
complexes of these calixarenes, photoexcitation of the antenna can induce lanthanide
emission via intramolecular energy transfer. Although the higher energy of the Tb3+
luminescent state makes it more difficult to sensitize than in the case of Eu3+, especially a
triphenylene antenna is found to have strong sensitizing ability toward not only Eu3+ but …
Abstract
The synthesis is described of a series of calix [4] arenes with three different sensitizer chromophores (“antenna”) attachedto the lower rim via a short spacer. In the Eu3+ and Tb3+ complexes of these calixarenes, photoexcitation of the antenna can induce lanthanide emission via intramolecular energy transfer. Although the higher energy of the Tb3+ luminescent state makes it more difficult to sensitize than in the case of Eu3+, especially a triphenylene antenna is found to have strong sensitizing ability toward not only Eu3+ but also Tb3+, allowing excitation of the lanthanide with wavelengths extending to 350 nm.
ACS Publications
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