Novel monohydrogenphosphate ion-selective polymeric membrane sensor based on phenyl urea substituted calix[4]arene

Modi, Nishith R.; Patel, Bhargav; Patel, Manishkumar B.; Menon, Shobhana K.

doi:10.1016/j.talanta.2011.08.042

Cited by 26 publications

(13 citation statements)

References 55 publications

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“…5,6 Calix [4]arenes bearing one or more (thio)urea groups on either the lower or the upper rim, have been the most studied for anion recognition. [7][8][9][10][11] Ureidocalix [5]arene 12 and calix [6]arene 13 derivatives have also been tested as anion receptors. Along with calixarene's development, dihomooxacalix [4]arenes (calix [4]arene analogues in which one CH 2 bridge is replaced by one CH 2 OCH 2 group), 14 have also been investigated.…”

Section: Introductionmentioning

confidence: 99%

“…where ݂ ା ሾߩ , ሿ is the condensed-to-atom variant of the Fukui function related to electron uptake (positive sign); 32,33 using the finite differences approximation, this latter quantity becomes 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 19 ݂ ା ሾߩ , ሿ ≈ ߩ ேାଵ ሺሻ − ߩ ே ሺሻ (9) where ߩ ேାଵ ሺሻ and ߩ ே ሺሻ are the electronic densities of the system with N+1 and N electrons at the ground state geometry of the N-electron system, respectively. To obtain information about ݂ ା ሾߩ , ሿ, their values can be condensed around each atomic site into a single value that characterizes the atom in the molecule.…”

Section: Introductionmentioning

confidence: 99%

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Site-Specific Description of the Enhanced Recognition Between Electrogenerated Nitrobenzene Anions and Dihomooxacalix[4]arene Bidentate Ureas

Martínez‐González

Armendáriz-Vidales

Ascenso³

et al. 2015

J. Org. Chem.

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Electron transfer controlled hydrogen bonding was studied for a series of nitrobenzene derivative radical anions, working as large guest anions, and substituted ureas, including dihomooxacalix[4]arene bidentate urea derivatives, in order to estimate binding constants (Kb) for the hydrogen-bonding process. Results showed enhanced Kb values for the interaction with phenyl-substituted bidentate urea, which is significantly larger than for the remaining compounds, e.g., in the case of 4-methoxynitrobenzene a 28-fold larger Kb value was obtained for the urea bearing a phenyl (Kb ∼ 6888) vs tert-butyl (Kb ∼ 247) moieties. The respective nucleophilic and electrophilic characters of the participant anion radical and urea hosts were parametrized with global and local electrodonating (ω(-)) and electroaccepting (ω(+)) powers, derived from DFT calculations. ω(-) data were useful for describing trends in structure–activity relationships when comparing nitrobenzene radical anions. However, ω(+) for the host urea structures lead to unreliable explanations of the experimental data. For the latter case, local descriptors ωk(+)(r) were estimated for the atoms within the urea region in the hosts [∑kωk(+)(r)]. By compiling all the theoretical and experimental data, a Kb-predictive contour plot was built considering ω(-) for the studied anion radicals and ∑kωk(+)(r) which affords good estimations.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Site-Specific Description of the Enhanced Recognition Between Electrogenerated Nitrobenzene Anions and Dihomooxacalix[4]arene Bidentate Ureas

Martínez‐González

Armendáriz-Vidales

Ascenso³

et al. 2015

J. Org. Chem.

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“…A variety of electrochemical sensing techniques have been investigated to detect orthophosphate ions in aqueous solution, summarised in reviews by Midgley (1986), Engblom (1998), Villalba et al (2009) and Warwick et al (2013). However, sensors capable of measuring the range of P concentrations (0.1 to 15 mg/l) typically found in wastewater, either suffer from limited durability, poor selectivity, or both (Ganjali et al, 2006;Kumar et al, 2008;Kumar et al, 2010;Tafesse and Enemchukwu, 2011;Modi et al, 2011). Selectivity issues and doubts regarding suitability for field use with environmental samples are also found with fluorescent based, optical sensors (Beer and Cadman, 1999;Ojida et al, 2002;Ojida et al, 2004;Hamachi, 2009).…”

Section: Introductionmentioning

confidence: 99%

Conductance based sensing and analysis of soluble phosphates in wastewater

Warwick

Guerreiro

Gómez‐Caballero

et al. 2014

Biosensors and Bioelectronics

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The current standard method used for measuring soluble phosphate in environmental water samples is based on a colourimetric approach, developed in the early 1960s. In order to provide an alternative, label free sensing solution, a molecularly imprinted polymer (MIP) was designed to function as a phosphate receptor. A combination of functional monomer (N-allylthiourea), cross-linker and monomer/template ratios were optimised in order to maximise the binding capacity for phosphate. When produced in membrane format, the MIP's ability to produce a reversible change in conductance in the presence of phosphate was explored for fabrication of a sensor which was able to selectively detect the presence of phosphate compared to sulphate, nitrate and chloride. In wastewater samples the sensor had a limit of detection of 0.16 mg P/l, and a linear range between 0.66 and 8 mg P/l. This is below the minimum monitoring level (1 mg P/l) as required by current legislation for wastewater discharges, making the sensor as developed promising for direct quantification of phosphate in environmental monitoring applications.

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“…To detect monohydrogenphosphate, an ion-selective polyvinyl chloride membrane electrode was developed by Modi et al (2011). The electrode used phenylureamodified calixarene as an ion carrier.…”

Section: Electrochemical Techniquesmentioning

confidence: 99%

Sensing Technology for Rapid Detection of Phosphorus in Water: A Review

Islam¹,

Reza²,

Jeong³

et al. 2016

Journal of Biosystems Engineering

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Purpose: Phosphorus is an essential element for water quality control. Excessive amounts of phosphorus causes algal bloom in water, which leads to eutrophication and a decline in water quality. It is necessary to maintain the optimum amount of phosphorus present. During the last decades, various studies have been conducted to determine phosphorus content in water. In this study, we present a comprehensive overview of colorimetric, electrochemical, fluorescence, microfluidic, and remote sensing technologies for the measurement of phosphorus in water, along with their working principles and limitations. Results: The colorimetric techniques determine the concentration of phosphorus through the use of colorgenerating reagents. This is specific to a single chemical species and inexpensive to use. The electrochemical techniques operate by using a reaction of the analyte of interest to generate an electrical signal that is proportional to the sample analyte concentration. They show a good linear output, good repeatability, and a high detection capacity. The fluorescence technique is a kind of spectroscopic analysis method. The particles in the sample are excited by irradiation at a specific wavelength, emitting radiation of a different wavelength. It is possible to use this for quantitative and qualitative analysis of the target analyte. The microfluidic techniques incorporate several features to control chemical reactions in a micro device of low sample volume and reagent consumption. They are cheap and rapid methods for the detection of phosphorus in water. The remote sensing technique analyzes the sample for the target analyte using an optical technique, but without direct contact. It can cover a wider area than the other techniques mentioned in this review. Conclusion: It is concluded that the sensing technologies reviewed in this study are promising for rapid detection of phosphorus in water. The measurement range and sensitivity of the sensors have been greatly improved recently.

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Novel monohydrogenphosphate ion-selective polymeric membrane sensor based on phenyl urea substituted calix[4]arene

Cited by 26 publications

References 55 publications

Site-Specific Description of the Enhanced Recognition Between Electrogenerated Nitrobenzene Anions and Dihomooxacalix[4]arene Bidentate Ureas

Site-Specific Description of the Enhanced Recognition Between Electrogenerated Nitrobenzene Anions and Dihomooxacalix[4]arene Bidentate Ureas

Conductance based sensing and analysis of soluble phosphates in wastewater

Sensing Technology for Rapid Detection of Phosphorus in Water: A Review

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