Isolable Borane-Based Diradical and Triradical Fused by a Diamagnetic Transition Metal Ion
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资源简介：
Complex
Fe(bpyB)3 (1, bpyB = 5,5′-bis(dimesitylboranyl)-2,2′-bipyridine)
and its reduced species [(18-c-6)K(THF)2]·[Fe(bpyB)3] (2) were synthesized. Their solid
state and electronic structures were investigated by single crystal
X-ray crystallography, electron paramagnetic resonance and UV–vis
spectroscopy, and SQUID measurements. In 1 two bpyB radical anions are fused by a diamagnetic FeII ion, whereas in 2 all three bpyB ligands
are in the radical state. Complex 1 possesses an open-shell
singlet ground state with a singlet–triplet gap of 0.18 kcal
mol–1 and 2 features an open-shell
doublet ground state with a doublet–quartet gap of 1.4 kcal
mol–1, as determined by SQUID measurements. The
unpaired-electrons in 1 and 2 mainly delocalize
over the boron atoms and the bipyrdine moieties with negligible spin
density at the iron center. Complex 2 represents the
first isolable example of boron-based triradicals.
创建时间：
2017-11-30
