Comment on ‘On Saltiel's isopolarizability approach and its applicability to diphenylpolyenes’ by J. Catalán, Chem. Phys. Lett. 635 (2015) 56–59

Abstract This is in response to Catalan's objection to our use of isopolarizability conditions in the resolution of the absorption and fluorescence spectra of the s-cis and s-trans all- trans -1.6-diphenyl-1,3,5-hexatriene ( ttt -DPH) conformers and the resolution of the fluorescence spectrum of the s-trans conformer to 2 1 A g  → 1 1 A g and 1 1 B u  → 1 1 A g spectra. Contrary to Catalan's assertion, we did not assume identical solvatochromic and thermochromic responses of ttt -DPH to medium changes. Those responses depend on a complex combination of factors that can differ from molecule to molecule.