THE ELECTRONIC ABSORPTION-SPECTRA OF MORPHOLINE GREEN AND SOME DERIVATIVES

Derivatives of Morpholine Green containing methyl and trifluoromethyl groups in the phenyl ring have been prepared and their absorption spec tra determined. The morpholino group is somewhat less efficient as an electron donor substituent than is the diethylamino group. Substituent s in the 3- or 4-positions modify the position of the first-frequency band to an extent linearly related to the appropriate Hammett substitu ent constant. Substitution in the 2-position brings about a red shift and an increase in intensity of the first band, together with a blue s hift and a decrease in intensity of the second band in accord with rot ation about an essential single bond.