Abstract
Aromatic hydrocarbons, especially pyrene and benzo[ a]pyrene, are strongly solubilized in aqueous solutions containing the polysoap-type macromolecules poly(vinylbenzo-18-crown-6) (P18C6) or poly(vinylbenzoglyme)(PVBG), a polystyrene with two CH 3O(CH 2CH 2O) 2- substituents attached to each benzene ring. The binding of pyrene was also studied spectrophotometrically utilizing the 7-nm bathochromic shift of the 334-nm transition band of pyrene in water when it transfers to the polymer domain. Intrinsic binding constants, measured between 35 and 10°C, range from 2–6 × 10 5 M −1, with Δ H = −7.2 kcal/mole and Δ S = 1 e.u. A maximum of one pyrene molecule per about 10 monomer base units can be solubilized into the polymers. In the presence of 0.1 M CsCl the solubility of pyrene in the Cs +-charged P18C6 is increased by nearly a factor of 3, but the solubility in PVBG to which no Cs + ions bind remains unchanged.
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