Microviscosity of water-pool, nw, in reversed micellar cores of sodium 1, 2-bis (2-ethylhexyloxycarbonyl)ethanesulfonate (AOT) and metal 1, 2-bis (3-ethylheptanoyl) ethanesulfonic acid (MOT) was determined with a viscosity-sensitive probe, Auramine 0 (AuO). AuO aqueous solutions were solubilized in AOT or MOT reversed micelles. The detemined by the measurement of the fluorescence intensity and absorbance of the solutions was depicted as a function of RW, A (=[H2O[MOT] and RW, M (= [H2O]/n[MOT], in which the number n shows metal valence).
The relation between ηw, and RW, M for MOT solutions coincided wi th that for AOT solutions. With the increase in RW( RW, A and RW, M), the ηw rapidly decreased in the region of R<10, and leveled off at about R = 20. The level off values of r7, were higher than the value of bulk water. This shows the localizatio n of Au0 molecules in the vicinity of anionic polar head of AOT or MOT surfactant molecules.
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