NLOphoric Triphenylamine Derived Donor ‐π‐Acceptor‐π‐Donor Based Colorants: Synthesis, Spectroscopic, Density Functional Theory and Z‐scan Studies

Three dyes (5a ‐c) with D‐π‐A‐π‐D structural motif were synthesized and investigated for their photophysical and nonlinear optical behavior. The photophysical behavior of 5a‐c were affected by the polarity of the medium and hence showed solvatochromism. The linear and non‐linear optical properties of the dyes obtained using the spectroscopic and computational methods were affected by different N‐substituted secondary donors used and the polarity of the solvent. The magnitude of nonlinear absorption coefficient (β), the magnitude of nonlinear refraction (n2) and third order nonlinear susceptibility (X(3)) for the dyes were estimated from the Z ‐scan analysis. AbstractThree Donor ‐π‐Acceptor‐π‐Donor type styryl dyes (5a ‐c) with different secondary donors are synthesized and characterized to study their nonlinear and linear optical properties. The structure –property relationships of the dyes are described in the light of systematic photophysical and theoretical investigations. The photophysical characteristics of5a ‐c are influenced by the polarity of the medium, with an appreciable bathochromic shift in emission (5b = 81 nm) and large Stoke shifts (5b = 104 –173 nm) in polar solvents.5a ‐c showed intramolecular charge transfer characteristics recognized with the help of emission solvatochromism, solvent polarity graphs, natural bond orbital analysis and HOMO –LUMO energy difference. The optimized geometry and frontier molecular orbit...

Source: Photochemistry and Photobiology - July 18, 2019 Category: Science Authors: Manish M. Raikwar, Elizabeth Mathew, Manu Varghese, Issac H. Joe, Sekar Nagaiyan Nethi Tags: Research Article Source Type: research