- Al3+ triggered aggregation induced emission of an anthracence based azine derivative in SDS medium
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An anthracene based unsymmetrical azine derivative, viz. 4-(anthracen-9-ylmethylene-hydrazonomethyl)-2-methoxy-phenol (L5), is synthesized and structurally characterized by single crystal X-ray diffraction (SC-XRD) analysis. The photo-physical interaction of L5 with Al3+ in sodium dodecyl sulfate (SDS) is highly selective, allowing recognition of nanomolar (62.8 nM) Al3+ without interference from common cations. The Job plot shows a 1 : 1 (mole ratio) interaction with an associated binding constant of 9.14 × 104 M-1. The "turn ON" fluorescence is attributed to aggregation induced emission (AIE). The Al3+ assisted particle size enhancement of L5 from 52.70 nm to 3413.06 nm (3.413 μM) observed through DLS studies corroborates the AIE mechanism. FESEM images also support the proposed mechanism. The cylindrical morphology of L5 changes to a cube shape due to aggregation of the [Al3+ + L5] adduct. Fluorescence lifetime decay (TCSPC) data indicate that the radiative decay of L5 is enhanced about ten times in the presence of Al3+. The average lifetime of L5 in the absence and presence of Al3+ is 0.98 ns and 1.45 respectively. In the presence of Na2EDTA, the emission intensity of the [L5 + Al3+] system is significantly quenched due to chelation of Al3+ by EDTA. TDDFT studies indicate higher stability of the [L5 + Al3+] adduct over free L5.
- Chatterjee, Sudeshna,Das, Debasis,Ghosh, Milan,Khanra, Somnath,Mukherjee, Pallabi,Ta, Sabyasachi
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- Easy and rapid chemosensing method for the identification of accumulated tin in algae: A strategy to protect a marine eco-system
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A simple and potent chemosensor AFL has been successfully developed to recognize Sn2+ selectively in marine algae or, more precisely, seaweed, as they are at huge risk from marine contamination. The bioaccumulation of Sn2+, mainly by the algae community, poses a great threat to the entire environment as Sn2+ toxicity flows towards higher organisms through food chain. The chemosensor AFL shows high selectivity and sensitivity towards Sn2+ with an extremely low detection limit, i.e. 90 nM, and demonstrates turn-on fluorescence with a bright cyan blue colour. The interaction mechanism is well supported by absorption, fluorescence titration, NMR titration and mass spectrometry, as well as theoretical analysis. Moreover, tin accumulation in green algae has also been revealed efficiently through confocal microscopic imaging. The quantification studies demonstrate that the AFL probe can be used as a proficient fluorescent marker for detecting Sn2+ in aquatic plants to save the marine ecosystem. This journal is
- Chattopadhyay, Ansuman,Kamila, Sreejata,Saha, Shrabani,Sahoo, Prithidipa
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p. 4233 - 4238
(2022/03/09)
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- Organosilanes and their magnetic nanoparticles as naked eye red emissive sensors for Ag+ions and potent anti-oxidants
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The present article reports the synthesis and structural characterization of a triazole appended isatin linked silane-based sensor using a highly efficient click chemistry approach. The yellow-coloured solution of the highly selective chemosensor turned red in the presence of Ag+ions and a red shift in the absorption spectra was also observed during the addition of these ions. IR spectroscopic studies support the metal ion binding with organosilanes in the cavity created by the carbonyl group of isatin, the nitrogen atom of the triazole ring and the Si-O bond of silane. Furthermore, the sensing application was enhanced by the immobilization of the ligand on the surface of iron oxide silica nanoparticles and the resulting silica surfaced nanocomposites were characterized using various techniques. B-H plots and calibration curves were employed to measure the association constants and limits of detection, respectively, of the synthesized ligands and their magnetic nanoparticles. The nanohybrids demonstrate a greater binding potential to Ag+ions. In addition, the synthesized organosilanes were investigated for cytotoxicity using the MTT assay, and the antioxidant activity was measured by decolouration of ABTS˙+
- Singh, Gurjaspreet,Diksha,Singh, Akshpreet,Satija, Pinky,Pawan,Mohit,González-Silvera,Espinosa-Ruíz, Cristóbal,Esteban, María Angeles
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p. 5517 - 5525
(2021/04/06)
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- Oxidative cyclization of thiosemicarbazide: a chemodosimetric approach for the highly selective fluorescence detection of cerium(iv)
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A simple thiosemicarbazide-based chemodosimeter was employed to detect Ce4+ion through turn-on fluorescence. The sensing mechanism was based on oxidative cyclization. The chemodosimeter exhibited exceptional selectivity for Ce4+, which allowed the detection of as low as 11 nM Ce4+ion in an aqueous ethanol medium.
- Bhattacharyya, Arunasis,Das, Debasis,Ghosh, Abhijit,Mukherjee, Pallabi,Shaikh, Ahad,Ta, Sabyasachi
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supporting information
p. 9452 - 9455
(2020/06/17)
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- POLYMERIZABLE COMPOUND AND OPTICAL ISOMER
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The present invention provides a polymerizable compound having high storage stability without causing crystal precipitation when added to a polymerizable composition. The present invention also provides a polymerizable composition containing the compound. When the filmy polymer produced through polymerization of the polymerizable composition is irradiated with UV light, it hardly discolors or peels from substrate. Further, the present invention provides a polymer produced through polymerization of the polymerizable composition and an optically anisotropic body using the polymer.
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Paragraph 0200
(2018/04/02)
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- POLYMERIZABLE COMPOUND AND OPTICALLY ANISOTROPIC BODY
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There is provided a polymerizable composition, by which discoloration or alignment defects are less likely to occur when a filmy polymer, which is obtained by adding a polymerizable compound to the polymerizable composition and polymerizing this composition, is irradiated with ultraviolet light. There are also provided a polymer obtained by polymerizing the polymerizable composition, and an optically anisotropic body using the polymer. The present invention provides a polymerizable low-wavelength dispersive or polymerizable reverse-wavelength dispersive compound having a partial structure represented by Formula (Z-0). Further, the present invention provides a composition containing the compound; a polymer obtained by polymerizing the composition; and an optically anisotropic body obtained by using the polymer.
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Page/Page column 153-155
(2017/05/28)
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- Tuning of azine derivatives for selective recognition of Ag+ with the in vitro tracking of endophytic bacteria in rice root tissue
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Several azine derivatives have been prepared and structurally characterized by spectroscopic and single-crystal X-ray diffraction analysis. Two of them, viz. naphthalene based (A10) and anthracene based (A11) show fluorescence enhancement in the presence of Ag+ in aqueous-methanol. Moreover, A11 efficiently tracks Ag+in vitro endophytic bacteria infected rice root tissue. Experimental results have been substantiated by theoretical DFT calculations.
- Ghosh, Abhijit,Adhikari, Sangita,Ta, Sabyasachi,Banik, Avishek,Dangar, Tushar Kanti,Mukhopadhyay, Subhra Kanti,Matalobos, Jesús Sanmartín,Brand?o, Paula,Félix, Vítor,Das, Debasis
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p. 19491 - 19499
(2016/12/16)
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