A novel star-shaped triazine-triphenylamine–based fluorescent chemosensor for the selective detection of picric acid

Triphenylamine-based small-molecule fluorescent probes

“…17) for the detection of ultratrace amounts of picric acid. 98 The absorbance peak of 66 increased at 394 nm upon the addition of PA. But the addition of other NACs (nitroaromatic compounds) to 66 did not cause any significant change in the absorption intensity.…”

Mechanistic Insight into Selective Sensing of Hazardous Hg2+ and Explosive Picric Acid by Using a Pyrene‐Azine‐Hydroxyquinoline Framework in Differential Media

“…It shows that the LUMO level (-1.87 eV) of PHQ is higher than the LUMO level (-3.92 eV) of PA, which is suggestive of energetically favourable PET process from photoexcited fluorophore to highly electron deficient PA, further inducing reverse electron transfer to the HOMO level (-5.03 eV) of fluorophore resulting in emission quenching characteristics of PHQ hydrosol towards PA owing to non-radiative deactivation process. [49][50][51][52][53] Thirdly, fluorescence lifetime measurements of PHQ in presence and absence of PA has been employed to ascertain the principal reason for quenching. The lifetime decay traces are best fitted into bi-exponential decay law.…”

Fluorescent zinc oxide nanoparticles of Boswellia ovalifoliolata for selective detection of picric acid

“…The low fluorescence emission of the ZnO nanoparticle may be due to the intrinsic defects produced by the ZnO nanoparticle such as interstitial zinc and oxygen vacancy and these defects will affect the fluorescence behaviour of the nanoparticle 14,15 . The high-energy absorption band in the region 278 nm can indicate the π-π * electron transition of phytochemicals in the plant extract such as phenols, tannins, steroids and terpenoids 12,13 . The photo physical property of the ZnO NP using UV-vis and fluorescence spectroscopy techniques aqueous solution, concentration were maintained at 10 mg/L.…”