A zinc polymer that lights down for picric acid
A fluorescent Zn(II)–Tröger’s-base coordination polymer senses phenolic nitroaromatics in water, detecting picric acid down to 26.3 ppb.
Source
A supramolecular Tröger's base derived coordination zinc polymer for fluorescent sensing of phenolic-nitroaromatic explosives in water
Study at a glance
- Design
- Other — Zn(II) Tröger’s-base coordination polymer synthesis and aqueous nitroaromatic fluorescence sensing
- N
- Materials sensing study — no sample N
- Population
- Aqueous TB-Zn-CP suspensions versus nitroaromatic analytes
- Outcome
- Selective fluorescence quenching of picric acid (LOD 26.3 ppb)
Structured fields used in claim comparison tables when every cited study has a complete layer.
What they did
Authors synthesized a 4-amino-1,8-naphthalimide Tröger’s-base ligand, assembled a Zn(II) coordination polymer (TB-Zn-CP), characterized morphology/gas uptake, and ran aqueous fluorescence titrations versus nitroaromatics plus time-resolved and recyclability tests.
What they found
Aqueous TB-Zn-CP is strongly fluorescent via naphthalimide ICT and is quenched most by phenolic nitroaromatics (picric acid), including discrimination versus TNT. Quenching is dynamic (linear Stern–Volmer). Picric acid detection limit is 26.3 ppb; the material is photostable and reusable.
The limits
What it doesn't show
Field deployment on real post-blast soil/water matrices is not reported; quenching is a solution-suspension optical assay, not a calibrated portable device.
Key terms
- Tröger’s base
- A V-shaped, chiral diazocine scaffold used here to rigidify a naphthalimide ligand.
- Internal charge transfer (ICT)
- Naphthalimide excited-state charge shift that produces strong fluorescence.
- Picric acid (PA)
- 2,4,6-Trinitrophenol, a phenolic nitroaromatic explosive and pollutant.
- Dynamic quenching
- Collisional excited-state quenching, diagnosed by a linear Stern–Volmer plot.
- Coordination polymer
- Extended metal–ligand network; here a Zn(II) sensory material.
Flashcards
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Quiz yourself
TB-Zn-CP is most selective for:
Common questions
What analyte is most selectively sensed?
Phenolic nitroaromatics, especially picric acid over TNT.
What is the PA detection limit?
26.3 ppb.
Static or dynamic quenching?
Dynamic, from time-resolved and temperature-dependent titrations.
Can the sensor be reused?
Yes: recyclability experiments show photostability and reversible sensing.
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