Study on New Quinacridone Derivatives with Enhanced Third-Order Nonlinear Optical Properties

Seven new quinacridone derivatives were designed and synthesized. The relationship between molecular structure and nonlinear optical properties was studied by cyclic voltammetry, DFT calculation and Z-scan. By introducing strong electron donating groups at the two sides of the quinacridone, and then introducing a strong electron withdrawing group dicyanoethylene group, the band gap of the molecule can be effectively reduced, and the intramolecular charge transfer can be promoted. The results shown that the HOMO/LUMO band gaps of the target compounds are all reduced, and QA-F has the best third- order nonlinear optical performance, and its gamma (gamma = 5.32 x 10(-33) esu) is 4.38 times that of QA-1 (gamma = 1.21 x 10(-33) esu). (C) 2020 Elsevier Ltd. All rights reserved.