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Schematic representation of the enthalpies of solution of pNPP2- (top) and pNPPT2- (bottom), in water and in 0.6 (mol) aq DMSO, and the enthalpies of transfer for the transition states of their hydrolysis reactions in the two solvents. Red in the upper diagram indicates values if the nucleophilic water molecule is included in the treatment of the pNPP reaction.
