A probe based on 2-(2′-hydroxyphenyl) benzothiazole (HBT) has been synthesized and used for the ratiometric detection of hydrazine. The is designed in such a way that excited state intramolecular proton transfer (ESIPT) HBT moiety gets blocked. chemodosimetric approach hydrazine to results recovery ESIPT by removal free through subsequent substitution, cyclization, elimination processes. successfully demonstrated enable live cells.

For ratiometric "naked eye" detection of CN(-), an ESIPT exhibiting benzothiazole receptor (BHI) is designed having one aldehyde group ortho and the other para to OH respectively. Due RAHBs, highly reactive undergoing nucleophilic cyanide addition selectively, which hampered ESIPT. This also supported by DFT TD-DFT calculations.

A spirobenzopyran-quinoline (SBPQ) based sensor was synthesized which selectively detects trivalent ions viz. Al3+, Fe3+ and Cr3+ through a fluorescence turn on signal in the red region (∼675 nm) with detection limit order of 10−8 M. The potentiality probe confirmed by employing it for bio-imaging Al3+ three different types live-cells.

In this study, we have synthesized a simple Schiff base type isophthaloyl salicylaldehyde hydrazone (ISH) moiety which selectively detects Al(III) and PPi with fluorescence enhancement at two different wavelengths in aqueous solution. The sensing phenomenon is also reversible thus the sensor beautifully mimics logic gates (INHIBIT EXOR gates).

A new naphthalimide–quinoline based probe (NAQ) is designed and synthesized its structure confirmed through single crystal analysis. It detects the trivalent ions (Fe3+ or Al3+ Cr3+) selectively among other alkali transition metal studied. NAQ shows a distinct ratiometric fluorescence behavior upon addition of in CH3CN–HEPES buffer solution (40/60, v/v, pH = 7.4). This fluorogenic sensing to M3+ (M3+ Fe3+ can be observed by naked eye, when illuminated under UV light.

A fluorescein based reactive probe has been designed and synthesized to detect hydrazine selectively over other common analytes. We used here 4-bromobutyrate as a masking unit of dye. Hydrazine plays the role de-masking agent set free dye through simultaneous substitution–cyclisation–elimination process. This leads 'turn on' fluorescence with easily discernible color change fast response time (<15 minutes).

A novel organic receptor, CPI, was fabricated for selective and sole recognition of CN − in real samples.

A new fluorescent probe was synthesized from rhodamine-6G and 6-(hydroxymethyl) picolinohydrazide for the sensing of Fe3+ in an aqueous environment. The structure sensor confirmed through its single crystal X-ray study. It exhibits a high specificity sensitivity towards over other interfering heavy transition metal ions (HTM). turn-on greenish-yellow fluorescence colorimetric change colourless to pink were observed upon addition which evokes almost 116- 23-fold enhancement absorbance...

A new rhodamine–quinoline based dyad has been synthesized. It shows a highly selective response to Cd2+ in the presence of other competing metal ions aqueous media (pH = 7.1). The detection limit sensor is 10−7 M level.

On the basis of Förster resonance energy transfer mechanism between rhodamine and quinoline–benzothiazole conjugated dyad, a new colorimetric as well fluorescence ratiometric probe was synthesized for selective detection Cd2+. The complex formation with Cd2+ confirmed through Cd2+-bound single-crystal structure. Capability imaging agent to detect cellular uptake demonstrated here using living RAW cells.

A new quinoline based sensor was developed and applied for the selective detection of Cd²⁺ both <italic>in vitro</italic> vivo</italic>.

We have synthesised a probe for the fluorescence ratiometric detection of Al³⁺. This can be used to image Al³⁺ in living cells.

A new spirobenzopyran derivative (SPNH) was designed and synthesized which applied in simultaneous colorimetric NIR fluorescence detections for Cr(3+). This receptor is normally colorless aqueous organic media but the formation of merocyanine occurs by Cr(3+) showing a yellow color. Here color UV-vis spectra strong emission at 675 nm makes SPNH good sensor ion. It also found to be useful cell imaging construction logic gate. shows INHIBIT gate OR absorption. To best our knowledge, this first...

A new "naked-eye" and ratiometric fluorescent zinc sensor (TAQ) of carboxamidoquinoline with 2-chloro-N-(quinol-8-yl)-acetamide as a receptor was designed synthesized. The TAQ shows good water solubility high selectivity for sensing; about 15-fold increase in fluorescence quantum yield 100 nm red-shift emission upon binding Zn2+ aqueous HEPES buffer solution are observed. human lung cancer cell line (A549) activity is also demonstrated.

A new chelator and ICT donor based visible light excitable Zn²⁺sensor was designed developed by integrating quinoline 2-hydroxy-3-(hydroxymethyl)-5-methylbenzaldehyde.

Abstract A new visible‐light‐excitable fluorescence ratiometric probe for OCl − has been developed based on a triphenylamine‐diamiomaleonitrile (TAM) moiety. The structure of the dye was confirmed by single‐crystal X‐ray analysis. It behaves as highly selective and sensitive over other analytes with fast response time (∼100 s). reacts leading to formation corresponding aldehyde in mixed‐aqueous system. detection limit is 10 −8 M range. also exhibits solvatofluorochromism. Changing solvent...

A new benzothiazole–quinoline–rhodamine-6G-based probe was synthesised. The can exclusively detect Fe³⁺ through a ratiometric manner in mixed aqueous system with detection limit the 10⁻⁸ M range.

A novel colorimetric and fluorescent sensing probe, CBTA, was designed for the selective detection of CN − .

Expression of concern for ‘A rhodamine–quinoline based chemodosimeter capable recognising endogenous OCl − in human blood cells’ by Shyamaprosad Goswami et al. , RSC Adv. 2014, 4 24881–24886, https://doi.org/10.1039/C4RA03200D.

A new chromogenic as well fluorogenic protocol based on the spirobenzopyran system for selective detection of nerve agent mimics (diethyl chlorophosphate or DCP vapour) within a few seconds (∼30 s) is designed, synthesized and characterized in this study.