Reversible light-driven magnetic switching of salen cobalt complex

• 来源期刊: 中国科学：化学（英文版）
• 年，卷（期）: 2020,（9）
• 所属期刊栏目: ARTICLES
• 页码范围: 1191-1197
• 页数: 7页
• 语种: 英文

摘要

Spin-crossover (SCO) metal complexes are expected to be widely used in data storage materials,display devices and sensors.Although a lot of spin-crossover photoswitches have been developed,the reversible photomodulation cases that work at room temperature are limited.Herein,a novel cobalt complex o-1-Co(Ⅱ) wherein the salen unit bridges with bis-diarylethene has been designed as switch to construct "off-on" logic operation at room temperature.The complex o-1-Co(Ⅱ) displays an abrupt,reversible and hysteretic spin crossover (T1/2↓=166 K,T1/2T=177 K,and ΔT1/2=11 K) between the high-spin (HS) and low-spin (LS) states.Meanwhile,photocyclization of o-1-Co(Ⅱ) with UV light produces a photoresponsive closed form c-1-Co(Ⅱ),which always stays at low-spin without SCO at all.Moreover,the magnetic switching of the complex can also be achieved with redox reactions between Co(Ⅱ) and Co(Ⅲ).