Anion recognition through amide-based dendritic molecule: A poly(vinyl chloride) based sensor for nitrate ion

Gupta, Vinod K.; Singh, Latika; Chandra, Sudeshna; Kumar, Sunita; Singh, Rakesh; Sethi, Bhavana

doi:10.1016/j.talanta.2011.05.014

Cited by 20 publications

(7 citation statements)

References 43 publications

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“…22 Figure 9 shows a typical change in The potential drift of the electrodes was derived from the ΔE dc /Δt ratio. 20 The received values of 4.6 μV/s calculated for the GCD/PtNPs-VXC/K + -ISM electrode (when the current of 1 nA was applied) and 0.6, 2.6, and 5.2 μV/s for the GCD/ PtNPs-VXC/NO 3 − -ISM electrode (when the current of 1, 5, and 10 nA was applied) are lower than those obtained from the VXC-based sensors and coated disc electrodes developed under similar conditions (ΔE dc /Δt = 19.9 μV/s for GCD/VXC/K + -ISM and 0.8 mV/s for GCD/K + -ISM or 6.1 μV/s for GCD/ VXC/NO 3 − -ISM and 6.49 mV/s for GCD/NO 3 − -ISM measured when the current of 1 nA was used).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Potentiometric Sensors with Carbon Black Supporting Platinum Nanoparticles

et al. 2013

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For the first time, a single-piece, all-solid-state ion-selective electrode was fabricated with carbon black supporting platinum nanoparticles (PtNPs-CB) and a polymeric membrane. The PtNPs-CB, as an intermediate layer, was drop-casted directly on the solid substrate, and then an ionophore-doped solvent polymeric membrane was added in order to form a sensor. The performance of the newly developed electrodes was evaluated on the basis of potassium and nitrate ions. The stability of the electrical potential for the electrodes was examined by performing current-reversal chronopotentiometry, and the influence of the interfacial water film was assessed by the potentiometric aqueous-layer test. Fabricated potassium- and nitrate-selective electrodes displayed a Nernstian slope and several outstanding properties such as high long-term potential stability, potential repeatability, and reproducibility.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Potentiometric Sensors with Carbon Black Supporting Platinum Nanoparticles

et al. 2013

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“…On the basis of the design principles developed toward the end of the last century, anionophores studied in the last two decades have continued to exploit acyclic and cyclic receptors based on established H-bond donors such as amides, (thio)ureas, , and guanidiniums . In parallel, a variety of other receptive moieties and receptor topologies have been established which are highlighted in more detail below.…”

Section: Potentiometric Anion Sensingmentioning

confidence: 99%

Electrochemical Anion Sensing: Supramolecular Approaches

2020

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Anions play a vital role in a broad range of environmental, technological, and physiological processes, making their detection/quantification valuable. Electroanalytical sensors offer much to the selective, sensitive, cheap, portable, and real-time analysis of anion presence where suitable combinations of selective (noncovalent) recognition and transduction can be integrated. Spurred on by significant developments in anion supramolecular chemistry, electrochemical anion sensing has received considerable attention in the past two decades. In this review, we provide a detailed overview of all electroanalytical techniques that have been used for this purpose, including voltammetric, impedimetric, capacititive, and potentiometric methods. We will confine our discussion to sensors that are based on synthetic anion receptors with a specific focus on reversible, noncovalent interactions, in particular, hydrogen-and halogen-bonding. Apart from their sensory properties, we will also discuss how electrochemical techniques can be used to study anion recognition processes (e.g., binding constant determination) and will furthermore provide a detailed outlook over future efforts and promising new avenues in this field.

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“…To achieve efficient binding of anions, various proton donating functional groups have been used, among which ureas, thioureas, amides, − amidines, and guanidines − are the most common. If connected to a suitable chromophore, the anion binding will result in observable change in color as in the case of the fluoride anion/pyrrolidylamidothiourea based sensor .…”

Section: Introductionmentioning

confidence: 99%

Insights on the Auxochromic Properties of the Guanidinium Group

et al. 2016

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UV/vis spectra of phenylguanidine (PHGU) in the gas phase and in acetonitrile have been simulated by TD-DFT calculations. Several DFT hybrid and long-range corrected functionals were tested with respect to CASPT2 gas phase calculations. Solvent effects were considered using polarizable continuum model (PCM) and compared with the measured data in acetonitrile. Comparison with isoelectronic phenylurea and related phenyltiourea was done as well. The PBE0 and long-range corrected CAM-B3LYP functionals were selected to investigate the effect of protonation on the excitation energies and absorption intensities of PHGU and several guanidine derivatives with different aromatic chromophoric groups (naphthyl, anthracenyl, quinolinyl, anthraquinonyl, and coumarinyl). Also, the effect of complexation and specific interactions through hydrogen bonds with different anions was examined. It was shown that the protonation of the guanidine subunit shifts the low energy absorption bands toward higher energies (hypsochromic shift). The shift is reduced upon complexation with anions. In phenylguanidine salts, λmax values are correlated to the anion basicity and strength of H-bonding. The observed changes diminish upon increase of chromophoric size (naphthyl, anthracenyl). Theoretical predictions of UV/vis spectra correlate well with experimentally measured spectra of selected guanidine derivatives and their salts.

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Anion recognition through amide-based dendritic molecule: A poly(vinyl chloride) based sensor for nitrate ion

Cited by 20 publications

References 43 publications

Potentiometric Sensors with Carbon Black Supporting Platinum Nanoparticles

Potentiometric Sensors with Carbon Black Supporting Platinum Nanoparticles

Electrochemical Anion Sensing: Supramolecular Approaches

Insights on the Auxochromic Properties of the Guanidinium Group

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