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- E-ISSN 2288-8985
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Electrochemical Behavior of Bis(2,2'-Bipyridyl) Copper(II)-Sodium Dodecyl Sulfate Solution in the Presence of <TEX>$MgCl_2$</TEX>
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
1997, v.10 no.2, pp.126-130
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>. Analytical Science and Technology, 10(2), 126-130.
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Abstract
Electrochemical behavior of 1.0mM bis(2,2'-bipyridyl)copper( II )(<TEX>${Cu(bpy)_2}^{2+}$</TEX>) in 100mM NaCl+27mM <TEX>$MgCl_2$</TEX> solution with and without sodium dodecyl sulfate(SDS) is investigated. In the presence of SDS, <TEX>$E_{pa}$</TEX> and <TEX>$E_{1/2}$</TEX> of <TEX>${Cu(bpy)_2}^{2+/1+}$</TEX> shifts to the positive direction compared to the SDS free. Teh intersection of two lines on <TEX>${\Delta}E_p$</TEX> vs. -log[SDS] plot for 1.0mM <TEX>$Cu(bpy)_2(NO_3)_2$</TEX> in 100mM NaCl+27mM <TEX>$MgCl_2$</TEX> solution is a critical micelle concentration(CMC). Reduced form <TEX>${Cu(bpy)_2}^{1+}$</TEX> in the presence of <TEX>$MgCl_2$</TEX> is more easily associated to dodecyl sulfate anion(<TEX>$DS^-$</TEX>) than oxidized <TEX>${Cu(bpy)_2}^{2+}$</TEX>. As the ionic strength is increased by the addition of multiply charged cations(<TEX>$MgCl_2$</TEX>), 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
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