Carbon disulfide solvent, helping to clarify the Stokes shift in diphenylpolyenes.

The Stokes shift found by Hausser et al. in diphenylpolyenes, which increases by lengthening its polyene chain, has received in the last 80 years a series of explanations, which we believe are not satisfactory. In this current work, using of CS2 as solvent for the fluorescence measurements of 1,6‐diphenylhexatriene (DPH) and 1,8‐diphenyloctatetraene (DPO) against temperature, it is concluded that the Stokes shift, shown by the diphenylpolyenes, is of structural origin and that it disappears from its photophysical behavior if it is possible that these compounds in their ground electronic state adopt a planar molecular structure, from which to initiate their photophysics. [ABSTRACT FROM AUTHOR]