A Main‐Group Element Radical Based One‐Dimensional Magnetic Chain

Abstract

The first main-group element radical based onedimensional magnetic chain (1K) n was realized by oneelectron reduction of the pyridinyl functionalizedb orane 1 with elemental potassium in THF in the absence of 18crown-6 (18-c-6). The electron spin density of (1K) n mainly resides at the boron centers with ac onsiderable contribution from central benzene and pyridine moieties.T he spin centers exhibit an antiferromagnetic interaction as demonstrated by magnetic measurements and theoretical calculations.I nc ontrast, the reduction in the presence of 18-c-6 afforded the separated radical anion salt 1K(Crown),i nw hicht he potassium cation was trapped by THF and 18-c-6 molecules.Further one-electron reduction of 1K(Crown) and (1K) n led to the diamagnetic monomer and polymer,respectively.Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

Persistent and Stable Organic Radicals: Design, Synthesis, and Applications

“…According to the X-ray crystallographic studies, the pyridinyl ring of 58 exhibits a more quinoid-like feature compared with its precursor (Figures 9F and 9G), which demonstrated that partial spin density delocalizes over the pyridine moiety and nitrogen atom. Feng et al 87 prepared a main-group element-based polyradical 59 exhibiting a one-dimensional magnetic character. The radical polymer 59 was afforded via a self-assemble process of the reduced monomer with the presence of elemental potassium in THF.…”

CAAC‐Based Thiele and Schlenk Hydrocarbons

“…The CAAC analogue of the Thiele hydrocarbon displays a singlet ground state (KekulØ diradical) while the CAAC analogue of the Schlenk hydrocarbon shows two unpaired electrons (non-KekulØ diradical) and undergoes an intermolecular double head-to-tail dimerization. The straightforward synthetic methodology revealed in this study will be instrumental for generating new classes of carbon-center-based di-and polyradical systems [21] and also for the synthesis of a new class of organic redox systems.…”

Tuning the Single-Molecule Magnetism of Dysprosium Complexes by a Redox-Noninnocent Diborane Ligand

“…Trisubstituted borane compounds have been widely applied as spin carriers in synthesizing radical species owing to their electron-deficient nature, and several triarylborane-based radical anions and diradical dianions have been successfully isolated. The electrochemical studies reveal that 5,5′-bis­(dimesitylboranyl)-2,2′-bipyridine (bpy B ) exhibits two highly reversible reduction peaks, suggesting the stable anion and dianion might be accessible .…”