Spectrophotometric Studies on Some 1,3,5-Triphenyl Formazans

Abstract

Some 1,3,5-triphenyl formazans were prepared. The spectra of,
these compounds were scanned in different organic solvents and
water. The values of wavelength maxima  (λ_max) of the bands and
the corresponding molar absorptivities (ε_max) were calculated. The
spectra in ethanol display mainly three sets of bands, each comprising
four bands lying at wavelength ranges 222-265, 250-303,
337-388 and 417-505 nm respectively. The bands were assigned
to the different electronic transitions. The effect of substituents on
the position of  λ_max was studied. The effect of different solvents
on the position of the C.T. bands was studied, an attempt to correlate
the position of these bands with different solvent parameters was
tried. It was found that, there is no single parameter governing the
band shift, but the shift in band position is the resultant of the effect
of different parameters.