Luminescent Detection of TCA and Herbicides

Report on an interesting luminescent assay that detects a variety of chloro and nitro aromatics. Researchers constructed a luminescent polymers that is quenched by target analytes (including TCA) that reduce fluorescence in relation to quantity present.  Current results are marked by low sensitivity with a Limit of Detection for TCA at 16,500ppt.  The other limitation is that measured changes in luminescence do not differentiate between sensitive analytes. A positive results could be the result of TCA, certain herbicides or one of several explosives.

Anion-Induced Structural Diversity of Zn and Cd Coordination Polymers Based on Bis-9,10-(pyridine-4-yl)-anthracene, Their Luminescent Properties, and Highly Efficient Sensing of Nitro Derivatives and Herbicides

Serhii I. Vasylevskyi, Dario M. Bassani, and Katharina M. Fromm


Luminescent coordination polymers (CPs) of Zn2+ or Cd2+ and bis-9,10-(pyridine-4-yl)-anthracene (BA) show different 1D and 2D topologies depending on the anion used in the precursor. Compounds {[Zn(μ2-BA)(MeOH)2(p-Tos)2]}n (1) and {[Zn(μ2-BA)(MeOH)2(CF3CO2)2]}n
(2) form linear structures and {BA@[Zn(μ2-BA)-(MeOH)2(H2O)2](CF3SO3)2}n
(3) featuring intercalation of uncoordinated BA molecules into linear ribbons. Cd-based CPs {[Cd(μ2-BA)2(ClO4)2]·n(DCM)}n
(4) and {[Cd(μ2-BA)(MeOH)2(Dioxane)(η2-SiF6)]·mDioxane}n
(5) form porous structures with 2D lattices. All complexes exhibit strong blue emission in the solid state with average lifetimes between 8 and 13 ns. The emission of compound 4 is sensitive to the presence of nitro aromatics, simazine, and trichloroanisole (TCA) and demonstrates nonlinear Stern−Volmer quenching
kinetics. Limits of detection (LOD) of 15 and 16 ppb for picric acid and TCA were achieved, respectively.

 DOI: 10.1021/acs inorgchem 8b03628

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