Synthesis and Optical properties of New Perylene Derivatives

Versatile substituents of perylene chrmophores creates higher absorptions in visible region of absorption spectrum and also exhibits higher coefficients of molar extinction. Furthermore, they have the ability to emit light of almost unitary which signifies higher fluorescence quantum yields. Perylene dyes acts a major role in dye sensitized solar cells due to the presence of four carbonyl groups in its core which creates ease of accepting an electron. In this research, N,N′-Bis(3,3,5,5-tetramethyl-4-piperidinyl)-3,4,9,10-perylenebis (dicarboximide) (PPDI) and N-(3,3,5,5-tetramethyl-4-piperidinyl)-3,4,9,10-perylenetetracarboxylic-3,4-anhydride-9,10-imide (PPMI) were sensitized and comparison of their photophysical properties were carried out. FTIR spectroscopy was used to characterize the compounds and their photophysical properties analyzed via absorption and emission spectroscopy. All the perylene dyes synthesized showed very high molar absorptivity with the highest being 152000 M-1cm-1 obtained from PPMI. PPMI absorption spectrum shows a 4 nm blue shift in a polar aprotic solvent as a result of increased level of polarity and the stabilization of PPMI energy levels it induces on the structure. Keywords: Perylene diimide, perylene tetracarboxylic acid, perylene monoimde, perylene carboxylic acid monoimide.