Photoinduced Significant Magnetization Enhancement in a Viologen-Based Photochromic Compound

Large enhancement of magnetization at room temperature (RT) is highly desirable for real application of photomagnets, but only one known example shows remarkable enhancement of magnetization at room temperature (>30%). This work has successfully obtained a viologen-based complex which exhibited room temperature photochromism and photomagnetism and realized remarkable enhancement of magnetization at room temperature by photoinduced electron transfer. The present viologen-based complex exhibits the second largest magnetization increasing amplitude of 31.1% at room temperature among electron transfer photochromic systems.