Abstract
It was previously reported by us, 2)_??_4) that Giles′ type hydrogen bonding made an important contribution to the interaction between disperse dyes and ester type fibres.
In the present paper, the same problem is discussed from the view-point of changes of Rf values in paperchromatography of disperse dyes when phenols are added.
The results are as follows;
1) Similarly as to esters, amines and alcohols, there exists the correlation between Rf value and phenol concentration [A]. Change of free energy (-ΔF) of interaction may be calculated from the estimated K.
2) In all conditions, m values are 1.0_??_1.2 for 0-substituted phenols and 1.4_??_1.5 for p-, m- and non-substituted phenols. This difference may be explained by “ortho effect” when it is combined with a fact that (-ΔF) values are smaller for _??_- than for others.
3) The larger pKa, value of phenol (or the smaller the proton donating power) is the smaller (-ΔF) value becomes, hence it is known that a phenol acts as proton donor and a dye as acceptor, and that the interaction between disperse dyes and phenols is supposed to be the form of type hydrogen bonding.
4) These conclusions support the results of the previous papers that a hydrogen bonding through a dye as proton acceptor plays an important role in disperse dyeing.
