A Main‐Group Element Radical Based One‐Dimensional Magnetic Chain. (28th March 2019)

• Record Type: Journal Article
• Authors: Feng, Rui; Zhang, Li; Ruan, Huapeng; Zhao, Yue; Tan, Gengwen; Wang, Xinping
• Is Part Of: Angewandte Chemie. Volume 131:Number 18(2019)
• Page Start: 6145
• Page End: 6149
• Publication Date: 2019-03-28
• Subjects: Boran -- Hauptgruppenelemente -- Polymere -- Pyridin -- Radikalanionen; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201901177
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: The first main‐group element radical based one‐dimensional magnetic chain (1K ) n was realized by one‐electron reduction of the pyridinyl functionalized borane1 with elemental potassium in THF in the absence of 18‐crown‐6 (18‐c‐6). The electron spin density of (1K ) n mainly resides at the boron centers with a considerable contribution from central benzene and pyridine moieties. The spin centers exhibit an antiferromagnetic interaction as demonstrated by magnetic measurements and theoretical calculations. In contrast, the reduction in the presence of 18‐c‐6 afforded the separated radical anion salt1K(Crown), in which the potassium cation was trapped by THF and 18‐c‐6 molecules. Further one‐electron reduction of1K(Crown) and (1K ) n led to the diamagnetic monomer and polymer, respectively.