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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 18, Number 2
BKCSDE 18(2)
February 20, 1997 

pH and Micellar Effects on the Quenching of Tris(2,2'-bipyridine)Ruthenium(Ⅱ) Luminescence by 1-Alkyl-4,4'-bipyridinium: Evidence of Deep Embedment of the Quencher Cations in Sodium Dodecyl Sulfate Micelle
Joon Woo Park, Yu Na Kim
The effect of pH and sodium dodecyl sulfate (SDS) micelle on the quenching of Ru(bpy)32+ luminescence by N-alkyl-4,4'-bipyridinium ions (RBPY+: R=methyl, octyl, dodecyl, benzyl) were investigated. In the absence of SDS, the quenching rate at pH 2 is similar to that of the corresponding methylalkyl viologens and much greater than that in pH 8 solution due to greater reducibility of the protonated form of RBPY+ (HRBPY2+). The quenching rate at pH 2 is strongly enhanced by the presence of SDS, while that at basic pH is greatly retarded. These observations are explained by deep embedment of RBPY+ into the hydrophobic hydrocarbon region of the micelle, whereas Ru(bpy)32+ and HRBPY2+ locate in the Stern layer of the micelle.
185 - 189
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