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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.
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What material is the sensor?
A nitrogen-rich Zn(II) coordination polymer (TB-Zn-CP) built from a 4-amino-1,8-naphthalimide Tröger’s base.
Source: A supramolecular Tröger's base derived coordination zinc polymer for fluorescent sensing of phenolic-nitroaromatic explosives in water · DOI · quote verified
Why is the aqueous suspension fluorescent?
Internal charge-transfer character of the naphthalimide.
Source: A supramolecular Tröger's base derived coordination zinc polymer for fluorescent sensing of phenolic-nitroaromatic explosives in water · DOI · quote verified
Which nitroaromatics quench most?
Phenolic nitroaromatics, with significant selectivity versus closely related NACs.
Source: A supramolecular Tröger's base derived coordination zinc polymer for fluorescent sensing of phenolic-nitroaromatic explosives in water · DOI · quote verified
Can the polymer tell picric acid from TNT?
Yes: it discriminates PA over TNT despite similar structures.
Source: A supramolecular Tröger's base derived coordination zinc polymer for fluorescent sensing of phenolic-nitroaromatic explosives in water · DOI · quote verified
Is quenching static or dynamic?
Dynamic, confirmed by time-resolved and temperature-dependent titrations.
Source: A supramolecular Tröger's base derived coordination zinc polymer for fluorescent sensing of phenolic-nitroaromatic explosives in water · DOI · quote verified
What detection limit is reported for picric acid?
26.3 ppb.
Source: A supramolecular Tröger's base derived coordination zinc polymer for fluorescent sensing of phenolic-nitroaromatic explosives in water · DOI · quote verified
Is sensing reversible?
Yes: recyclability experiments show high photostability and reversible sensing.
Source: A supramolecular Tröger's base derived coordination zinc polymer for fluorescent sensing of phenolic-nitroaromatic explosives in water · DOI · quote verified
What excited-state process is invoked for NAC quenching?
Excited-state energy transfer from TB-Zn-CP to the nitroaromatics.
Source: A supramolecular Tröger's base derived coordination zinc polymer for fluorescent sensing of phenolic-nitroaromatic explosives in water · DOI · quote verified
What yield is given for naphthalimide 1?
78% (4.9 g, 11.3 mmol) after trituration.
Source: A supramolecular Tröger's base derived coordination zinc polymer for fluorescent sensing of phenolic-nitroaromatic explosives in water · DOI · quote verified
What WHO-related motivation is given for sensing PA in water?
Allowed groundwater PA is 0.001 mg L−1; above that it is considered toxic.
Source: A supramolecular Tröger's base derived coordination zinc polymer for fluorescent sensing of phenolic-nitroaromatic explosives in water · DOI · quote verified
Are non-phenolic NACs equally effective quenchers?
Non-phenolic NACs such as TNT quench less than more electron-deficient phenolic PA.
Source: A supramolecular Tröger's base derived coordination zinc polymer for fluorescent sensing of phenolic-nitroaromatic explosives in water · DOI · quote verified