Development of highly selective chemosensor for thorium estimation

Selvakumar, R.; Kumar, Santosh; Vijayakrishna, Kari; Sivaramakrishna, Akella; Rao, C. V. S. Brahmmananda; Sivaraman, N.; Sahoo, Suban K.

doi:10.1016/j.snb.2017.08.131

Cited by 19 publications

(7 citation statements)

References 44 publications

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“…The detection limit (which is defined as the Th 4+ concentration corresponding to three times the standard deviation of blank signal) of the sensor was 0.45 nM in a 10 min electrical recording. To the best of our knowledge, such a detection limit, although not as impressive as that (20 pM) of ICPMS, is much better than those (ranging from 2 nM to 2.02 μM) of various other sensitive thorium detection methods − (Supporting Information, Table S1). This detection limit is more than good enough for analysis of thorium in environmental samples (note that the World Health Organization’s thorium concentration limit in drinking water is <1.06 μM).…”

Section: Resultsmentioning

confidence: 80%

“…If so, to detect such material production and weapon development activities are critical to nonproliferation. Thus far, various analytical techniques have been utilized for thorium detection, including flow-injection analysis, inductively coupled plasma mass spectrometry (ICPMS), neutron activation analysis (NAA), as well as spectrophotometric, fluorimetric, electrochemical, and radiometric methods. However, most of these techniques are laborious (e.g., involving with time-consuming preconcentration and/or radiochemical separation procedures) and require the use of expensive and sophisticated instruments.…”

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confidence: 99%

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Computation-Assisted Nanopore Detection of Thorium Ions

et al. 2018

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Thorium is a well-known radioactive and chemically toxic contaminant in the environment. The continuous exposure to thorium may cause an increased risk of developing lung and liver diseases as well as lung, pancreas, and bone cancer. Due to its use in nuclear industry and other industrial applications, thorium may be accidentally released to the environment from its mining and processing plants. In this work, we developed a rapid, real-time, and label-free nanopore sensor for Th detection by using an aspartic acid containing peptide as a chelating agent and tuning the electrolyte solution pH to control the net charges of the peptide ligand and its metal ion complex. The method is highly sensitive with a detection limit of 0.45 nM. Furthermore, the sensor is selective: other metal ions (e.g., UO, Pb, Cu, Ni, Hg, Zn, As, Mg, and Ca) with concentrations of up to 3 orders of magnitude greater than that of Th would not interfere with Thdetection. In addition, simulated water samples were successfully analyzed. Our developed computation-assisted sensing strategy should find useful applications in the development of nanopore sensors for other metal ions.

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Section: Resultsmentioning

confidence: 80%

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confidence: 99%

Computation-Assisted Nanopore Detection of Thorium Ions

et al. 2018

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“…The interference study reveals there is no interference from UO 2 2+ , Zr 4+ , Ti 4+ , lanthanides and Al 3+ by this sensor L (Table S2). ,− Hence, L can be used as an excellent chromogenic sensor for Th 4+ detection in the presence of the competing metal ions and anions.…”

Section: Resultsmentioning

confidence: 99%

“…The electronic structures of L and L–Th 4+ were examined with density functional theory (DFT) by using the hybrid B3LYP exchange–correlation function. The Stuttgart small-core relativistic effective core potential was considered for the Th atom whereas the 6-311G(d,p) basis set was considered for C, N, O, and H atoms . The excited state parameters were investigated by using time-dependent DFT (TD-DFT) on DFT-optimized geometries.…”

Section: Methodsmentioning

confidence: 99%

“…The Stuttgart small-core relativistic effective core potential was considered for the Th atom whereas the 6-311G(d,p) basis set was considered for C, N, O, and H atoms. 34 The excited state parameters were investigated by using time-dependent DFT (TD-DFT) on DFT-optimized geometries. All calculations were performed using the Gaussian 09 program.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Development of the Smartphone-Assisted Colorimetric Detection of Thorium by Using New Schiff’s Base and Its Applications to Real Time Samples

Kumar

Vijayakrishna

et al. 2018

Inorg. Chem.

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In this paper, a new Th 4+ ion-selective chromogenic sensor (L) was developed by reacting 1,10phenanthroline-2,9-dicarbohydrazide with 2-hydroxy naphthaldehyde. The sensing ability of L toward Th 4+ was investigated in solution and paper strips loaded with L using spectrophotometric and colorimetric methods. The selective interaction of L was examined with various f-metal ions and other selected metal ions from s-block and d-block elements. Results show that by the colorimetric method in solutionphase dimethyl sulfoxide/H 2 O (7:3, v/v) and paper strip methods, the naked-eye detectable color change of L occurred from colorless solution to yellow-orange and pale yellow colour upon interacting with Th 4+ and Al 3+ , respectively, whereas other metal ions did not interfere. The ligand L exhibits two absorbance bands at 320 and 375 nm because of ligand-toligand charge transfer. Upon interaction with Th 4+ , L undergoes red shift of both absorption bands and the formation of a new UV−vis band at 335 and 440 nm. The UV−visible spectral studies indicate the formation of a 1:1 host−guest complex between L and Th 4+ with an association constant of 4.7 × 10 3 M −1 . The limit of quantification and limit of detection of L for the analysis of Th 4+ are found to be 167 and 50 nM, respectively. The visually detectable color change of L has been well integrated with a smartphone RGB color value to make it an analytical signal for real-time analysis of Th 4+ with the detection limit down to 116 nM. Besides, L was applied for the analysis of Th 4+ content present in various real water samples, monazite, and lantern mantle samples by spectrophotometry and RGB color values. The binding mode of L with Th 4+ is investigated by 1 H NMR, electrospray ionization-mass, and theoretical studies.

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Unexpected Coordination Modes of Bisphosphoramides with Lanthanum(III) and Thorium(IV) Salts: Synthesis, Structural Characterization, Stability, and Extraction Studies

et al. 2021

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A series of bisphosphoramides of the type R2P(O)NHCH2CH2NHP(O)R2 (L) (where R=n‐butyl, n‐hexyl, n‐octyl, ethoxy, phenyl) is synthesized in two‐steps by Atherton‐Todd reaction of ethylenediamine and H‐phosphonate derived from the reaction of diethylphosphite and the Grignard reagent. These ligands were employed in the preparation of La(III) and Th(IV)complexes of the general type [LaCl3(L)2]n and [Th(NO3)4Th(IV)2]. Notably, La(III) complexes of bisphosphoramides are found as infinite coordination polymers with bridging phosphine oxide ligands in an intermolecular fashion. In contrast, Th(IV) complexes are formed with two chelating bisphosphoramide ligands around the metal center intramolecularly. All these ligands and the corresponding metal complexes are characterized by spectroscopic and analytical data. The single‐crystal X‐ray analyses of lanthanum and thorium complexes each confirm the coordination modes. Further, these ligands were evaluated to check the extraction behavior with Am(III), U(VI), Th(IV), and Pu(IV) as a function of nitric acid concentration.

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Development of highly selective chemosensor for thorium estimation

Cited by 19 publications

References 44 publications

Computation-Assisted Nanopore Detection of Thorium Ions

Computation-Assisted Nanopore Detection of Thorium Ions

Development of the Smartphone-Assisted Colorimetric Detection of Thorium by Using New Schiff’s Base and Its Applications to Real Time Samples

Unexpected Coordination Modes of Bisphosphoramides with Lanthanum(III) and Thorium(IV) Salts: Synthesis, Structural Characterization, Stability, and Extraction Studies

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