Triphenylamine-based fluorophores containing pyrene or corannulene show variable fluorescence quenching sensitivity toward nitro explosives. The most sensitive fluorophore is capable of detecting TNT on the ng cm(-2) scale; the array is useful for identifying nitro aromatics.
Four new fluorophores containing multiple fluorogenic branches of phenylene-ethynylene and salicylic acid Cu 2+ binding sites are synthesized and evaluated as Cu 2+ sensors in aqueous media. The fluorophore, F4, having a triphenylamine core and three fluorogenic branches, possesses superior sensitivity, selectivity and emission properties for fluorescence quenching detection of Cu 2+ . This fluorophore exhibits the highest Cu 2+ quenching sensitivity in aqueous solution; K sv ¼ 5.79 Â 10 6 M À1 .The relatively high fluorescence emission of this fluorophore provides excellent visual contrast in a solid state paper-based sensor that enables naked eye detection of Cu 2+ at the picomole level.
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