Organic Letters 2002-03-07

Bis(isoquinoline N-oxide) pincers as a new type of metal cation dual channel fluorosensor.

Daniel Collado, Ezequiel Perez-Inestrosa, Rafael Suau, Jean-Pierre Desvergne, Henri Bouas-Laurent

Index: Org. Lett. 4(5) , 855-8, (2002)

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Abstract

[structure: see text] A new type of donor-spacer-acceptor podand system has been synthesized and proved as an efficient dual channel fluorosensor for Li+, Mg2+, and Ca2+. The known ability for the N-oxide function to bind Lewis acids is the key step in the appearance of a new emitting charge-transfer (CT) excited state. The occurrence of this CT state for alkaline earth (Mg2+ and Ca2+) and not for alkaline metals (Li+) provided a new type of dual channel fluorosensors.