Abstract
The pressure dependence of excited-state proton transfer equilibria has been examined for aqueous solutions of several substituted napthalene dyes, in particular 1-dimethylaminonaphthalene-5-sulfonic acid (DANS). The pressure-induced shift in equilibrium is characterized by volume changes spanning the range ΔV*=−18 cm3 mole−1 to ΔV*=+4 cm3-mole−1. A deuterium oxide solvent isotope effect is evident in the pressure response of DANS, leading to a 35% smaller ⋎ΔV*⋎ in D2O relative to H2O.
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