Characterization of Salophen Co(III) Acetate Ionophore for Nitrite Recognition

Crespo, Gastón A.; Afshar, Majid Ghahraman; Barrabés, Noelia; Pawlak, Marcin; Bakker, Eric

doi:10.1016/j.electacta.2015.03.180

Cited by 11 publications

(7 citation statements)

References 41 publications

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“…This mode of chelation was also confirmed by the computational study (Fig. ) and was previously reported for ionophores of similar structure .…”

Section: Resultssupporting

confidence: 89%

“…The ion I carries a charge of Z I . E M is the membrane potential, determined by subtracting the cell potential for a membrane without ionophore from that for the sandwich membrane and so depends mainly on the host‐guest interaction .…”

Section: Resultsmentioning

confidence: 99%

“…The determination of complex formation constants in the membrane phase allows us to understand the magnitude of the binding strength between metal complexes and thiocyanate. The so‐called sandwich membrane method is very useful in the study of such formation constants . Two membranes, one with ionophore and ion‐exchanger and another one containing only ion‐exchanger without ionophore, were prepared.…”

Section: Methodsmentioning

confidence: 99%

“…Two membranes, one with ionophore and ion‐exchanger and another one containing only ion‐exchanger without ionophore, were prepared. One of the membranes was then placed on top of the other and the potential across the sandwich was measured potentiometrically at pH 4.7 using acetate buffer.…”

Section: Methodsmentioning

confidence: 99%

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Potentiometric Anion Selectivity and Analytical Applications of Polymer Membrane Electrodes Based on Novel Mn(III)‐ and Mn(IV)‐Salophen Complexes

2016

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New Mn(III)‐L and Mn(IV)‐L complexes were prepared from the highly lipophilic salophen ligand (L): phenol 2,2′‐[(4,5‐dimethyl‐1,2‐phenylene)bis[(E)‐nitrilomethylidyne]]bis[4,6‐bis(1,1‐dimethylethyl). The prepared complexes were fully characterized and used for the construction of thiocyanate membrane electrodes. Optimized membrane electrodes contained 33.0 mg PVC, 66.0 mg o‐nitrophenyloctylether, 50 or 5 (mole %) tetrakis(trifluoromethyl)phenyl borate and 1 mg Mn(III)‐L (sensor 2) or Mn‐(IV)‐L (sensor 12), respectively. Such electrodes exhibited linear responses toward thiocynate in a concentration range of 10−1–10−5 M and detection limits of 8.3×10−6, 8.9×10−6 M for sensor 2 and 12, respectively. Optimized membrane electrodes exhbited high selectivty toward thiocayante compared to more lipophilic anions. The observed thiocyanate selectivity of the optimized membranes was confirmed by formation constant calculations for Mn(III)‐L and Mn(IV)‐L with SCN−, β=1014.1 and 1012.5, which was measured potentiometrically using the sandwich membrane method. Furthermore, computational study using DFT calculations was performed to at DFT/B3LYP level of theory to confirm the observed selectivity data. The response times were 3 and 0.5 min for low and high concentrations. The lifetimes of the optimized electrodes were ∼4–6 weeks. The analytical utility of the optimized membrane electrodes was demonstrated by the analysis of thiocyanate level in different saliva samples.

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“…This mode of chelation was also confirmed by the computational study (Fig. ) and was previously reported for ionophores of similar structure .…”

Section: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Potentiometric Anion Selectivity and Analytical Applications of Polymer Membrane Electrodes Based on Novel Mn(III)‐ and Mn(IV)‐Salophen Complexes

2016

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“…Due to its potential toxicity and impact on biological systems, industry, environment, agricultural an interest has been aroused for developing large numbers of new analytical procedures for estimation trace amounts of nitrite ion in different sample types regarding environmental protection and public health (Mousavi andShirkhanloo, 2009, Yilong et al, 2015). Thus many methods have been proposed and reported in the literature for quantitation of nitrite and nitrate including: spectrophotometric methods (Sastry et al, 2002, Afkhami et al, 2004, Aydın et al, 2005, Rahshid, 2006, Al-Okab and Syed, 2007, Mohammed, 2008, Veena and Narayana, 2009, Narayana and Sunil, 2009, Hassan and Ali, 2010, Nagaraja et al, 2010, Pourreza et al, 2012, Bilal and Bashir, 2013, Porche, 2014, Galán-Vidal et al, 2014, Zhang et al, 2014, Zhang et al, 2016, Bahadoran et al, 2016, Nagaraja et al, 2016, Altunay et al, 2017, Zahedi et al, 2017, Fraihat, 2017, kinetic methods (Ghasemi et al, 2004, Shariati-Rad et al, 2017, FIA (Higuchi and Motomizu, 1999, Ensafi et al, 2004, Pourhossein et al, 2005, Pasquali et al, 2007, Yaqoob et al, 2013, electrochemical methods such as; potentiometry (Hassan et al, 2003, Vlascici et al, 2006, Crespo et al, 2015, Deng et al, 2016…”

Section: Introductionmentioning

confidence: 99%

Diazo-Coupling Reactions for Spectrophotometric Estimation of Nitrite in Some Cured Meat Products

Qader

2017

ZJPAS

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This work reported a rapid, simple and sensitive spectrophotometric procedure for determination of nitrite ion by diazo-coupling reactions. 2-Aminobenzoimidazole (dissolved in H2SO4) was charged with nitrite ion, which leads to produce a water-soluble diazonium ion that subsequently reacted with orcinol as coupling agent to yield an azo compound, reaching maximum absorption at 305 nm. Many parameters of the reaction conditions have been studied and optimized to enhance the sensitivity of the proposed method. After plotting the calibration curve, it was found that Beer's law is obeyed over the concentration range of 0.05-3.0 µg/mL of nitrite, with 0.03µg/mL and 1.55×10 4 L/mol.cm of detection limit and molar absorptivity, respectively. The accuracy and precision of the method were tested and obtained values were acceptable. The influence of common cations, anions and interferences was studied, then nitrite ion in some cured meat samples determined with the proposed method. The results were compared with the standard method and favorable agreement between the obtained data was observed.

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A new Co(III) complex of Schiff base derivative for electrochemical recognition of nitrite anion

et al. 2017

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The synthesis and characterization of a new Co(III) complex of a salphen-type Schiff base ligand, (E)-2-{[(2-aminopyridin-3-yl)imino]methyl}-4,6-di-tert-butylphenol (HL), are reported. The characterization has been carried out using X-ray single crystallographic, thermogravimetric, and spectroscopic techniques. The complex has been combined with polyvinyl chloride (PVC) membrane of various compositions and tested as an electrochemical electrode towards recognition of several anions. The electrode exhibits exceptional electrochemical recognition for the nitrite (NO − 2) anion in aqueous media. The electrode exhibited a linear response to NO − 2 with a detection limit of 5.76 μM and displayed a linear Nernstian slope over the nitrite concentration range of 1.0 × 10 −5-1.0 × 10 −1 M in the pH range of 3-7 and a fast response time of less than 10 seconds. Theoretical calculations showed that the sensing could be via anion exchange in the Co(III) complex.

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Characterization of Salophen Co(III) Acetate Ionophore for Nitrite Recognition

Cited by 11 publications

References 41 publications

Potentiometric Anion Selectivity and Analytical Applications of Polymer Membrane Electrodes Based on Novel Mn(III)‐ and Mn(IV)‐Salophen Complexes

Potentiometric Anion Selectivity and Analytical Applications of Polymer Membrane Electrodes Based on Novel Mn(III)‐ and Mn(IV)‐Salophen Complexes

Diazo-Coupling Reactions for Spectrophotometric Estimation of Nitrite in Some Cured Meat Products

A new Co(III) complex of Schiff base derivative for electrochemical recognition of nitrite anion

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