抄録
Solvent effect on the ultraviolet and visible absorption spectra of 14 kinds of pyrazolone-azomethine derivatives was examined. These were compounds possessing a substituent with -SO2NH- in 3-position of pyrazolone ring or those without such a substituent. In both, maximum wave length of the x-band tended to shift to a longer wave-length side with the increase of dielectric constants. The compounds with a substituent of -SO2NH- in 3-position greatly affect the resonance system by the dissociation of -SO2NH- in a basic buffer solution and the band makes a hypsochromic shift.
