A test paper for high-selectivity detecting fluoride ion in natural aqueous environments without any spectroscopic instrumentation was achieved by using Ru-bipy based quinonehydrazone as a chromo- and fluorogenic hybrid chemosensor.

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A novel 8-fold interpenetration diamondoid-like chiral condensed neutral coordination polymer, bis{4-[2-(4-pyridyl)ethenyl]benzoato}zinc [Zn(PEBA) 2 ] 1, synthesized by the hydrothermal reaction between Zn(ClO 4 ) 2 •6H 2 O and 4-[2-(4-pyridylethenyl)]benzenecarbonitrile (PEBC), displays very strong blue fluorescent emission and SHG response (ca. 1.5 3 that of urea) as well as high thermal stability (up to ca. 430 °C).

A highly selective and sensitive chromogenic and fluorogenic dual signal responding fluoride-sensor 1, comprising a Ru-bipy fluorophore (bipy = 2,2'-bipyridine) and a 2,4-dinitrophenylhydrazone chromophore was prepared and spectroscopically characterized. Uv-vis titrations with F- revealed the appearance of a new intense absorption band centered at about 580 nm which was accompanied by a dramatic change in color from yellow to magenta, with the association constant logK being 6.71 +/- 0.04. Fluorescence spectra showed that upon addition of F-, the emission intensities enhanced significantly without any change in the excited and emission wavelengths, suggesting a potential photoinduced electronic transfer (PET) signaling transduction mechanism. An easy-to-prepare test paper which was obtained by putting a filter paper into an acetonitrile solution of 1, can detect F- in aqueous media, indicating the potential application for detecting F- in natural aqueous environments without any spectroscopic instrumentation. Spectroscopic titrations of the free ligand were also studied for comparison.