Chelator Probe with Exceptionally High Stokes Shift for Selective Detection of OAc⁻ with Red Emission: Application as a Biosensor

Abstract

A novel chelator probe with flexible structural configuration has been synthesized as chemosensor for selective detection of biotic anion like OAc− by chromogenic as well as fluorogenic signal. The nitro substituted chelator probe has shown pale yellow to deep yellow coloration upon detection of OAc− ion. Significantly the emission of the chelator probe upon recognition of the anion has been turned ON in low energy region which has been explained through PET‐ESIPT‐ILCT‐C=N isomerisation based pathways. The chelator probe has shown exceptionally high stroke's shift. The host guest interaction has been confirmed by different sophisticated analytical tools such as UV‐Vis, fluorescence, 1H‐NMR and FT‐IR. Significantly the fluorescence turn on phenomena has been utilized to detect intracellular OAc− inside candida albicans to explore the applicability of the chelator probe as bio sensor.

Acid‐treated Graphitic Carbon Nitride Nanosheets as Fluorescence Probe for Detection of Hemin

“…Benesi‐Hildebranf equation was used to estimate the binding constant (K) of g‐C 3 N 4 NSs and hemin. It is calculated that the K is value of 2.44×10 5 M −1 (Figure S6), which indicating the high selectivity towards hemin of g‐C 3 N 4 NSs . Therefore, these conclusions distinctly indicate that g‐C 3 N 4 NSs as fluorescence probe can be used to discriminate hemin in complex sample.…”

Zn2+ Recognition for Pathogenesis of Pick's Disease via a Luminescent Test Kit

“…L1 displayed four signals at 220, 250, 325 with a broad signal at 415 nm due to π-π*, n-π* and charge transfer transition within the framework respectively. The absorption spectra of L1 in acetonitrile: HEPES (4 : 1, v/v, conc n : 2 × 10 À 5 M, pH 7.4) [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33] (λ max /nm; ε/M À 1 cm À 1 ): 325 (18100) and for L1-Zn 2 + (λ max /nm; ε/M À 1 cm À 1 ): 370 (11100) respectively (Figure S5a-b). Photoexcitation at 400 nm gives fluorescence of L1 (conc n : 5 × 10 À 6 M, pH 7.4) at 495 nm which reveals a Stokes Shift of 80 nm.…”

Intracellular Fluorometric Recognition of Explosive and Mutagenic Nitroaromatics by a Luminescent Phenanthrene‐Naphthalene Sulfone

“…Advanced Density functional theory (DFTÀ D3) could calculate the energetically minimized geometry of Br-LANS with NACs by theoretical analysis. [37][38][39] As a consequence, DFT could be useful to identify the host-guest geometry. [40][41] To make the event realistic, solvent model for acetonitrile has been used herein with B3-LYP and def2-SVP functional for all atoms.…”