Electrochemical Behavior of Bis(2,2'-Bipyridyl) Copper(II)-Sodium Dodecyl Sulfate Solution in the Presence of <TEX>$MgCl_2$</TEX>

Ko, Young Chun; 고영춘; Chung, Keun Ho; 정근호

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P-ISSN1225-0163
E-ISSN2288-8985
SCOPUS, ESCI, KCI

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P-ISSN 1225-0163
E-ISSN 2288-8985

e-Submission

Vol.10, No.2

PubReader Citation

Electrochemical Behavior of Bis(2,2'-Bipyridyl) Copper(II)-Sodium Dodecyl Sulfate Solution in the Presence of $MgCl_2$

Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985

1997, v.10 no.2, pp.126-130

Ko, Young Chun
Chung, Keun Ho

Ko, Y. C., & Chung, K. H. (1997). Electrochemical Behavior of Bis(2,2'-Bipyridyl) Copper(II)-Sodium Dodecyl Sulfate Solution in the Presence of <TEX>$MgCl_2$</TEX>. , 10(2), 126-130.

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Abstract

Electrochemical behavior of 1.0mM bis(2,2'-bipyridyl)copper( II )(${Cu(bpy)_2}^{2+}$) in 100mM NaCl+27mM $MgCl_2$ solution with and without sodium dodecyl sulfate(SDS) is investigated. In the presence of SDS, $E_{pa}$ and $E_{1/2}$ of ${Cu(bpy)_2}^{2+/1+}$ shifts to the positive direction compared to the SDS free. Teh intersection of two lines on ${\Delta}E_p$ vs. -log[SDS] plot for 1.0mM $Cu(bpy)_2(NO_3)_2$ in 100mM NaCl+27mM $MgCl_2$ solution is a critical micelle concentration(CMC). Reduced form ${Cu(bpy)_2}^{1+}$ in the presence of $MgCl_2$ is more easily associated to dodecyl sulfate anion($DS^-$) than oxidized ${Cu(bpy)_2}^{2+}$. As the ionic strength is increased by the addition of multiply charged cations($MgCl_2$), the double layer becomes more compact and micelle formation is more difficult.

keywords: bis(2, 2'-bipyridyl)copper(II), sodium dodecyl sulfate, critical micelle concentration, microenvironment, ionic strength, double layer, surfactant assembly