Designing strategies towards non-fullerene DTCR1 based compounds for the exploration of non-linear optical behavior

In this work, non-fullerene based derivatives (DTCD2-DTCD8) with D1-p-D2-p-A architecture were tailored by alteration of terminal acceptor group of a reference molecule (DTCR1) in order to investigate their non-linear optical (NLO) behavior. The effect of peripheral acceptor and donor sites on designed configuration for optical communication and electronic response was examined using DFT based calculations. The natural bond orbitals (NBOs), frontier molecular orbitals (FMOs), UV-Vis analysis, nonlinear optics (NLO), density of states (DOS) and transition density matrix (TDM) were calculated at M06-2X/6-311G(d,p) level. The energy gap of DTCD2DTCD8 was found to be lowered (DE = 3.970-3.603 eV) with wider absorption spectra as compared to that of DTCR1 (4.221 eV). All the derivatives (DTCD2-DTCD8) demonstrated significant NLO behavior than the reference (DTCR1). Among all the designed compounds, DTCD8 exhibited the highest dipole moment (mtotal = 4.777 D), average linear polarizability [(a) = 1.920 x 10-22 esu], first hyperpolarizability (btotal = 10.58 x 10-28 esu) and second hyperpolarizability (ctotal = 8.028 x 10-33 esu) as it showed the lowest energy gap (3.603 eV) as compared to the other molecules.& COPY; 2023 The Author(s). Published by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Automated summary

In this work, non-fullerene based derivatives (DTCD2-DTCD8) with D1-p-D2-p-A architecture were designed to investigate their nonlinear optical (NLO) behavior by altering the terminal acceptor group of a reference molecule (DTCR1). The influence of peripheral acceptor and donor sites on the designed configuration for optical communication and electronic response was examined using DFT based calculations. The calculated results showed that all the derivatives (DTCD2-DTCD8) exhibited significant NLO behavior, with DTCD8 demonstrating the highest dipole moment, linear polarizability, first hyperpolarizability, and second hyperpolarizability due to its lowest energy gap value.