Selective sodium ion transfer across a water/1,2-dichloroethane micro-interface by a calix[4]arene derivative

Kaykal, Ferhat; Kocabaş, Erdal; Bingöl, Haluk; Akgemci, Emine Guler; Coşkun, Ahmet

doi:10.1016/j.jelechem.2011.01.019

Cited by 8 publications

(1 citation statement)

References 44 publications

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“…3,8,[10][11][12] In general, ionophores show similar behavior to the natural transporters, because they show a selectivity profile toward metal ions of biological importance, such as K + , Na + and Ca 2+ . [13][14][15] In previous studies on facilitated ion transfer, it was possible to determine of the complexating ligand and stability constants of the complexes formed between cation and ligand at the ITIES. 16 Proton transfer by novel 2-aminothiazole derivative at the water|1,2-dichloroethane interface has also been tested at the ITIES.…”

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Electrochemical Investigation of the Ionophore Carboxylic “Lasalocid A” at the Water/1,2-dichloroethane Interface

Barrera-Cruz

Amador-Hernández

Velázquez-Manzanares

2012

J. Electrochem. Soc.

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This study describes the electrochemical behavior of the ionophore carboxylic "lasalocid A" at the water|1,2-dichlorotehane interface. It was carried out by means of cyclic voltammetry and ac impedance spectroscopy. The cyclic voltammetry studies showed that this ionophore is able to facilitate transfer of divalent metal ions across a liquid|liquid interface, and the differential capacitance measured as a function of ionophore concentration shows that lasalocid is absorbed at the interface and that it breaks the charge stratification when it transfers the metal ion across the interface. The interfacial complexation of the heavy metal and the transport across biological membranes is probably a key question in the heavy metal accumulation in a biological cell. Therefore the liquid|liquid interface could be a good model to mimic the metal transfer across a hydrophobic environment.Ion transfer across the biological cell is an important process for the economy of living systems. For this reason the scientific community has focused on this process in order to understand the behavior of membrane transporters at the biological membrane cell. 1 However, the complexity of the biological membrane makes it difficult to study the interaction lipid-protein (channel) in vivo. The water|membrane interface with regard to the structure and the characterization of membrane proteins is not easy to study because they are in a hydrophobic environment that makes it complicated to crystallize them for X-ray studies. 2 The interface of two immiscible electrolyte solutions (ITIES) has been a useful tool in representing the membrane|water interface in a simpler way since it can be manipulated electrochemically; thus the ITIES has been a model in the study of the charge and ion transfer across a hydrophobic environment, such as the transfer of metal ion across a biological membrane. 3 Another application is the selective metal extraction through the use of hydrophobic ionophores, which could have a great impact in the metallurgical industry. 4 The main function of the ionophores is to minimize the energy needed to transfer metal ion across the ITIES. 5 Natural ionophores, such as gramacidin, valinomicin, nigercin and monensin have been used at the ITIES and for different purposes 6-9 related to metal ion transfer. Several synthetic ionophores have also been prepared that are able to transport metal ion across hydrophobic barriers and the ITIES; examples of these molecules are crown ethers and calixarenes, tetraethyl-p-tert-butyl calixarene tetraacetate. 3,8,[10][11][12] In general, ionophores show similar behavior to the natural transporters, because they show a selectivity profile toward metal ions of biological importance, such as K + , Na + and Ca 2+ . [13][14][15] In previous studies on facilitated ion transfer, it was possible to determine of the complexating ligand and stability constants of the complexes formed between cation and ligand at the ITIES. 16 Proton transfer by novel 2-aminothiazole derivative at the water|1,2-dichloroetha...

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Electrochemical Investigation of the Ionophore Carboxylic “Lasalocid A” at the Water/1,2-dichloroethane Interface

Barrera-Cruz

Amador-Hernández

Velázquez-Manzanares

2012

J. Electrochem. Soc.

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Analytical Aspects of Metal Phenolates

Zabicky

2014

Patai's Chemistry of Functional Groups

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The analytical methods are approached in three ways: (i) detection and quantitation of specific metal phenolates, especially the simpler ones used in industry; (ii) methods of detection and quantitation involving selective formation of a complex of the analyte with a phenolic ligand, taking advantage of special properties of the complex (optical, luminescent, electrochemical, phase transfer, etc.); (iii) certain metal–phenolate complexes act as analytical tools, specifically interacting as hosts with the analyte or by interchanging the metal ions and undergoing changes of properties (optical, luminescent, electrochemical, etc.) that can be applied to detection or quantitation. Although in approaches (ii) and (iii) the main subject is selective metal cation recognition, some attention is also paid to selective recognition of anions and molecules. For completeness of the analytical methods covered by phenolic reagents or complexes, specific recognition of ammonium ions, and especially quaternary ammonium ones, is discussed in a special section.

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Facilitated Ion Transfers at the Micro‐Water/1,2‐Dichloroethane Interface by Crown Ether Derivatives

et al. 2013

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The transfers of potassium ion (K+) facilitated by 3,3′,6,6′‐tetrakis[p‐(n‐dodecyloxy)benzoyloxymethyl]dibenzo‐18‐crown‐6 (L1) and of sodium ion (Na+) facilitated by 3′,6′‐bis{3′′,4′′,5′′‐tris[p‐(n‐dodecyloxy)benzyloxy]benzoyloxymethyl}benzo‐15‐crown‐5 (L2) have been investigated at the micro‐water/1.2‐dichloroethane (micro‐W/DCE) interface supported at the tip of a micropipette by cyclic voltammetry and chronoamperometry. The experimental results demonstrate that the mechanisms of both facilitated ion transfer (FIT) processes correspond to the transfer by an interfacial complexation (TIC) and the transfer by an interfacial dissociation (TID) processes. Some thermodynamic parameters, such as, stoichiometry, diffusion coefficient and the association constants are evaluated by cyclic voltammetry. Furthermore, the chronoamperometry has been employed to explore the roughness of the interface supported at the micropipette by analysis of the current‐time curves based on the system of facilitated Na+ transfer by L2 at the water/DCE interface.

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Selective sodium ion transfer across a water/1,2-dichloroethane micro-interface by a calix[4]arene derivative

Cited by 8 publications

References 44 publications

Electrochemical Investigation of the Ionophore Carboxylic “Lasalocid A” at the Water/1,2-dichloroethane Interface

Electrochemical Investigation of the Ionophore Carboxylic “Lasalocid A” at the Water/1,2-dichloroethane Interface

Analytical Aspects of Metal Phenolates

Facilitated Ion Transfers at the Micro‐Water/1,2‐Dichloroethane Interface by Crown Ether Derivatives

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