Relationship Between Structure and Electroluminescent, Photochromic, or Second‐Order Nonlinear Optical Property

Photochromism and single-component white light emission from a metalloviologen complex based on 1,5-naphthyridine

“…7 Metalloviologens act as an important emerging branch of ET photochromism and feature “D–M–A” coordination mode. 8 Generally, ligands with lone-pair electrons and N-heterocyclic aromatic ligands serve as electron donors (D) and acceptors (A), respectively, and diamagnetic metal ions (M) assist in electron transfer. Compared with conventional viologen photochromic compounds, metalloviologen complexes have many advantages, such as simple synthesis, 9 easy expansion of materials systems, good thermal and moisture stability, and feasibility of multifunctionality.…”