Abstract
Pyrene-based compounds have a great potential as fluorescent chemosensors for various analytes including common nitro-explosives, such as 2,4,6-trinitrotoluene (TNT). Compounds having two pyrene units in one molecule, such as bispyrenylalkanes, are able to form stable, bright emissive in a visual wavelength region excimers both in non-polar and polar environments. In this work we wish to report that in non-polar solvents the excimer has poor chemosensing properties while in aqueous solutions it provides significant “turn-off” fluorescence response to TNT in the sub-nanomolar concentrations.
Highlights
Due to an increased terrorism threats, the remote detection of TNT and DNT as main components of explosive blends [1] has become an actual task
Among many fluorescent chemosensors [16], those based on polycyclic aromatic hydrocarbons (PAHbased) have gained wide attention owing to their unique fluorescent properties, such as long-wavelength excimer emission [17] either in a solution [18] or in a solid state
In our experiments only a feeble response through the excimer fluorescence quenching with poor linearity in the Stern-Volmer plot was observed in cyclohexane
Summary
Due to an increased terrorism threats, the remote detection of TNT and DNT as main components of explosive blends [1] has become an actual task. Pyrene-based chemosensors can be ideal candidates to use in PAH-based chemosensors because of the wellknown pyrene intense emission with long lifetime values [19,20,21,22,23,24,25,26,27,28], tendency to form excimers [29] and high sensitivity to electron-deficient molecules (e.g., nitroaromatics) [30,31] In this manuscript we wish to report our study of the ability of the simple bispyrenylalkane chemosensor to effectively detect a common nitro-explosive, such as 2,4,6-trinitrotoluene (TNT)
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