Potentiometric multi-walled carbon nanotube Zn-sensor based on a naphthalocyanine neutral carrier: experimental and theoretical studies

Shehab, Ola R.; Mansour, Ahmed M.

doi:10.1039/c5ra12055a

Cited by 4 publications

(1 citation statement)

References 51 publications

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“…In the model structures of Co(III) benzimidazole complexes, the default Polarized Continuum Model (PCM) 39 was used, by including water as a solvent (ε=78.39). Natural bonding orbitals (NBO) analysis 40 was performed using NBO 3.1 program at the DFT/B3LYP/6‐31G(d) level of theory. The electronic spectra of [Co(L 2Cl )Cl 3 (H 2 O)] in DMSO were calculated with B3LYP and CAM‐B3LYP functional combined with 6‐31G(d) basis set using TD‐DFT approach 35.…”

Section: Methodsmentioning

confidence: 99%

Total Synthesis of the Spirocyclic Oxindole Alkaloids Corynoxine, Corynoxine B, Corynoxeine, and Rhynchophylline

et al. 2013

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Racemic total syntheses of four spirocyclic oxindole alkaloids are reported. The general starting material was an N‐2‐butenylated 2‐hydroxytryptamine, which underwent a base‐mediated Mannich spirocyclisation with a functionalised aldehyde to generate the C‐ring. The second key step was a Pd‐catalysed cyclisation of an α‐keto ester enolate (in the original aldehyde) onto an allylic carbonate (in the N‐substituent) to form the D‐ring. The stereoselectivities of the key steps were moderate, but the isomers were readily purified, so that the natural products could be conveniently prepared, three of them for the first time.

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Section: Methodsmentioning

confidence: 99%

Total Synthesis of the Spirocyclic Oxindole Alkaloids Corynoxine, Corynoxine B, Corynoxeine, and Rhynchophylline

et al. 2013

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Potentiometric Sensing of Aspirin Metabolite in Human Plasma and Pharmaceutical Preparations Using Co(III)‐complex Based Electrodes: Experimental and Quantum Chemical Calculations

Shehab

Mansour

2016

Electroanalysis

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[a] 1Introduction Salicylate (sal À )i st he main metabolite coming from the hydrolysis of acetylsalicylate and its derivatives,w hich are extensively employed as an analgesic, inflammatory,a ntimicrobial agents,a nd also as ah eart attack protective in severalp harmaceuticalf ormulations [1][2][3].T he diagnosis of poisoning usually involves the determination of sal À in plasma. In general, the sal À level ranges from 30-100 mg/l after usual therapeutic doses, 50-300 mg/l with high doses and 700-1400 mg/l following acuteo verdose.I na ddition, salicylic acid is used as an antiseptic and ap reservative for foods and also applied in synthesis of dyes.T herefore, the determination of sal À and its derivatives in pharmaceuticals and biological samples is vital.S everal methods were reported for analysis of sal À including high performance liquid chromatography [4],f luorometry [5],U V spectrophotometry [6,7],f low injection atomic absorption spectrometry [8],p otentiometric [9-13] and voltammetry [14].M ost of them are tediousa nd time-consuming. In addition, Tr inderr eaction[ 15],a st he most widely used methodf or determination of sal À ,a lways lacks adequate selectivity due to the shortcomings of this reaction.In fact, direct potentiometric methodsb ased on ion-selective electrodes (ISEs) are of simpler design, lower cost, faster time,h igher selectivity,a nd employed for direct measurement of ionic species in the pharmaceutical and biological samples.T he design and synthesis of selective anion receptors that recognize anionic molecules is ag reat challenge for scientists. Theh ydration energy is high for big anions and this makes the receptors hard to sense these ions [16][17][18][19][20][21].Benzimidazole derivatives are also of wide interest because of their diverse biological activityand clinical applications as antihelmintic [22] Abstract:T hree novel poly vinyl chloride( PVC) (A), carbon paste (CP) (B), and coated glassy carbon-MWCNT (CGC) (C)s alicylate (sal, o-nitrophenyloctyl ether as amediator and tridodecylmethylammonium chloride as ac ationic additive were successfully usedf or determination of sal À in human plasma and pharmaceutical formulations.T he sal À -sensors exhibited enhanced sensitivity with slopeo fÀ63.5, À60.5 and À58.9 mV/decade and detection limit of 1.0 10 À5 , 4.0 10 À7 ,a nd 1.0 10 À6 mol L À1 for A-C sensors respectively.Q uantum chemicalc alculations were carried out by HF and DFT/B3LYP methodst oe xplore and investigate the interaction between the receptor and the different anions.T he intermolecular H-bondc reated between the uncoordinated C=Oofsalicylate group and the secondary amino groupi nt he complexi st he key factor of the selectivity of the proposed sensor. Al inear relation is established between the natural charge on the Co center and the value of the binding energy, where the decrease in positive charge is associated by an increase in the anionbinding energy.

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Structural investigations and mobility enhanced of Vanadyl 2,3-naphthalocyanine (VONc) nanostructured films under thermal effect

2018

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Potentiometric multi-walled carbon nanotube Zn-sensor based on a naphthalocyanine neutral carrier: experimental and theoretical studies

Abstract: Naphthalocyanine derivative is incorporated in carbon paste electrode and examined as a neutral carrier for zinc selective electrode.

Cited by 4 publications

References 51 publications

Total Synthesis of the Spirocyclic Oxindole Alkaloids Corynoxine, Corynoxine B, Corynoxeine, and Rhynchophylline

Total Synthesis of the Spirocyclic Oxindole Alkaloids Corynoxine, Corynoxine B, Corynoxeine, and Rhynchophylline

Potentiometric Sensing of Aspirin Metabolite in Human Plasma and Pharmaceutical Preparations Using Co(III)‐complex Based Electrodes: Experimental and Quantum Chemical Calculations

Structural investigations and mobility enhanced of Vanadyl 2,3-naphthalocyanine (VONc) nanostructured films under thermal effect

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