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A strategy for the rational design of a new optical sensor material for the selective recognition of long-chain carboxylates in water is presented. A spacer-substituted 7-urea-phenoxazin-3-one is employed as the signaling moiety and a mesoporous trimethylsilylated UVM-7 (MCM-41 type) material served as the solid support.

Indoaniline chromophore is the first molecular chemosensor able to selectively sense Hg(super 2+) in the ppb range in water by using wither absorption or emission measurements. Coupling of improved Hg(super 2+) selectivity with efficient signaling via the amino-keto conjugative backbone is reported.

A general framework for combining two complementary and competitive signaling mechanisms in different metal ions is described.

Sensitive and selective detection of AGI and HgII and CuII can be obtained using an orthogonally decoupled fluorescent probe.

Incorporation of a tailor-made size-restricted dithia-aza-oxa macrocycle, 1-oxa-4,10-dithia-7-aza-cyclododecane, via a phenyl linker into two fluorescent sensor molecules with electronically decoupled, rigidly fixed, and sterically preoriented architectures, a 1,3,5-triaryl-Δ²-pyrazoline and a meso-substituted boron-dipyrromethene (BDP), yields amplified fluorescence in the red-visible spectral range upon binding of FeIII ions. The response to FeIII and potentially interfering metal ions is studied in highly polar aprotic and protic solvents for both probes as well as in neat and buffered aqueous solution for one of the sensor molecules, the BDP derivative. In organic solvents, the fluorescence of both indicators is quenched by an intramolecular charge or electron transfer in the excited state and coordination of FeIII leads to a revival of their fluorescence without pronounced spectral shifts. Most remarkably, the unbound BDP derivative shows dual emission in water and can be employed for the selective ratiometric signaling of FeIII in buffered aqueous solutions. [ABSTRACT FROM AUTHOR]

Investigates the design of a fluorescent mercury chemosensor. Molecular structure; Electronic properties of the chromophore; Absorption and emission measurements.