Structure Switching and Modulation of the Magnetic Properties in Diarylethene‐Bridged Metallosupramolecular Compounds by Controlled Coordination‐Driven Self‐Assembly

• Published in: Angewandte Chemie International Edition Vol. 58; no. 13; pp. 4339 - 4344
• Main Authors: Li, Zhao‐Yang, Dai, Jing‐Wei, Damjanović, Marko, Shiga, Takuya, Wang, Jin‐Hua, Zhao, Jia, Oshio, Hiroki, Yamashita, Masahiro, Bu, Xian‐He
• Format: Journal Article
• Language: English
• Published: Germany Wiley Subscription Services, Inc 22.03.2019
• Edition: International ed. in English
• Subjects: Coordination compounds; Crossovers; Diamagnetism; iron complexes; Irradiation; Magnetic properties; Paramagnetism; photochromism; Radiation; self-assembly; spin-crossover; supramolecular chemistry; self-assembly; spin-crossover; photochromism; iron complexes; supramolecular chemistry
• ISSN: 1433-7851; 1521-3773; 1521-3773
• DOI: 10.1002/anie.201900789

We report three self‐assembled iron complexes that comprised an anti‐parallel open form (o‐Lanti), a parallel open form (o‐Lsyn), and a closed form (c‐L) of diarylethene conformers. Under kinetic control, FeII2(o‐Lanti)3 was isolated, which exhibited a dinuclear structure with diamagnetic properties. Under light‐irradiation control, FeII2(c‐L)3 was prepared and exhibited paramagnetism and spin‐crossover behaviour. Under thermodynamic control and in the presence of indispensable [FeIII(Tp*)(CN)3]−, FeII2(o‐Lanti)3 and FeII2(c‐L)3 transformed into tetranuclear FeIII2FeII2(o‐Lsyn)2, which exhibited complete spin‐crossover behaviour at T1/2=353 K. That's so metal: By controlling the self‐assembly processes, three iron complexes composed of different diarylethene conformations were isolated. Importantly, this controlled self‐assembly also allowed the modulation of their magnetic properties.