Coordination chemistry
A zinc polymer that lights down for picric acid
Open access · cc by · source: Europe PMC
A fluorescent Zn(II)–Tröger’s-base coordination polymer senses phenolic nitroaromatics in water, detecting picric acid down to 26.3 ppb.
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.
Key findings
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.
Methodology
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.
Limitations
Field deployment on real post-blast soil/water matrices is not reported; quenching is a solution-suspension optical assay, not a calibrated portable device.
How this study connects
Role on claims
Each row is a claim on a concept or method page where this paper supports, challenges, or qualifies the statement. Roles are hand-checked — not a model guess.
This library holds 8 empirical chemistry papers on coordination chemistry with isolated findings, rates or spectra rather than reviews.
Evidence for the claim as stated.
A fluorescent Zn(II)–Tröger’s-base coordination polymer senses phenolic nitroaromatics in water, detecting picric acid down to 26.3 ppb.
Evidence for the claim as stated.
A crystal structure is a snapshot; solution speciation and fluxional ligands can differ.
Evidence for the claim as stated.
A Zn Tröger’s-base naphthalimide polymer (TB-Zn-CP) is quenched most by phenolic nitroaromatics (picric acid) in water, including discrimination versus TNT. Quenching is dynamic (linear Stern–Volmer); picric acid LOD is 26.3 ppb; the material is photostable and reusable. Field post-blast matrices are not reported.
Evidence for the claim as stated.
Turn-on sensing, turn-off sensing, FRET photocatalysis and photoluminescence quenching of a molecular catalyst are four fluorescence experiments. Ag/Au clusters raise ΦF 3.28% → 12.89% to report nM FQs; phage carbons quench to LOD 8.0 μM Fe³⁺; TB-Zn-CP quenches to 26.3 ppb picric acid; TPE cages donate to RhB (ΦET 77%/58%) to drive 97% cyclisation; Pt(II) PL quenching assigns oxidative quenching for >82% alkene CF₃ products. 'Fluorescence showed it worked' does not travel among those papers.
Evidence for the claim as stated.
A fluorescence LOD is not a chromatographic identity. The cluster probe’s 3.1–4.4 nM LODs match HPLC-UV recoveries but cannot speciate mixed FQs. Inner-filter Fe³⁺ quenching at 8.0 μM is a different (and coarser) analytical claim than 26.3 ppb picric acid by Stern–Volmer on a coordination polymer.
Evidence for the claim as stated.
Open questions
Tensions this paper is part of
From concept pages' “where studies disagree.” Disagreement means the same question; scope means different assays, populations, or outcomes.
A crystal structure is a snapshot; solution speciation and fluxional ligands can differ.
Turn-on sensing, turn-off sensing, FRET photocatalysis and photoluminescence quenching of a molecular catalyst are four fluorescence experiments. Ag/Au clusters raise ΦF 3.28% → 12.89% to report nM FQs; phage carbons quench to LOD 8.0 μM Fe³⁺; TB-Zn-CP quenches to 26.3 ppb picric acid; TPE cages donate to RhB (ΦET 77%/58%) to drive 97% cyclisation; Pt(II) PL quenching assigns oxidative quenching for >82% alkene CF₃ products. 'Fluorescence showed it worked' does not travel among those papers.
A fluorescence LOD is not a chromatographic identity. The cluster probe’s 3.1–4.4 nM LODs match HPLC-UV recoveries but cannot speciate mixed FQs. Inner-filter Fe³⁺ quenching at 8.0 μM is a different (and coarser) analytical claim than 26.3 ppb picric acid by Stern–Volmer on a coordination polymer.
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