Charge-transfer complexation in micellar solutions. Water penetrability of micelles

摘要: In anionic sodium dodecyl sulfate (SDS) micellar solutions a dramatic enhancement is observed in the degree of ground-state electron donor-acceptor (EDA) complexation between some hydrophobic donors and hydrophilic acceptor N,N'-dimethyl-4,4'-bipyridiniu dichloride (paraquat, Pq/sup 2 +/), when compared to behavior these EDA systems homogeneous or cationic cetyltrimethylammonium bromide solution. The occurrence direct contact donor molecules, which evident from charge-transfer absorption complexes formed, favors an open structure such as provided by porous cluster model recently advanced Menger. Furthermore, consequences enhanced mechanism quenching fluorescent probe molecules are discussed. While pyrene fluorescence +/ has been discussed formerly on basis dynamic only, it not demonstrated that static mechanisms contribute almost equally overall SDS solutions. 37 references.