Properties of individual solvents

Ethylene glycol methyl ether 214 Carbon disulphide 243 

Vapour pressure equation constants (Logio mmHg)  

Dielectric constant (at 20 °C) 1.844 Evaporation time ( -Butyl acetate =1.0) 13.0 

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In contrast, some parameters are properties of individual solvent molecules. Examples are dipole moment and log P (the octanol-water partition coefficient). These parameters are appropriate where individual solvent molecules are engaged in interactions away from the bulk phase. Thus, log P is used sensibly to describe the tendency of solvents to interact with (and affect the functioning of) the enzyme molecules. However, these parameters are not good choices when bulk solvent behavior is important, such as its ability to solvate water or reactants (and hence affect their availability to the enzyme). Even when such mechanisms are important, it is quite common to see correlations presented against log P. However, any relationship probably reflects the correlation of log P with appropriate scales of bulk solvent behaviour. 

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