Direct Evidence for Neutral N‑Pyrazolyl
Radicals: Paddlewheel Dibismuthanes Bearing Pyrazolato Ligands with
Very Short Bi–Bi Single Bonds
Posted on 2017-10-12 - 14:38
Neutral N-pyrazolyl radicals [3,5-R2pz]• as reactive intermediates were generated by one-electron oxidization
of the corresponding 3,5-disubstituted pyrazolato anions [3,5-R2pz]− (R = tBu, Ph) with
BiCl3 and trapped by the use of 5,5-dimethyl-1-pyrroline-N-oxide as a spin trap, which was confirmed by electron
paramagnetic resonance spectral analysis. With dimerization of the
postulated pyrazolato low-valent BiII radical species,
two novel paddlewheel pyrazolatodibismuthanes [L2(Bi–Bi)L2] [L = η1,η1-3,5-R2pz; R = tBu (5α, 5β, and 5γ), Ph (6)] were isolated
and structurally characterized.
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Zhao, Ming-Gang; Hao, Ting-Ting; Zhang, Xiang; Ma, Jian-Ping; Su, Ji-Hu; Zheng, Wenjun (2017). Direct Evidence for Neutral N‑Pyrazolyl
Radicals: Paddlewheel Dibismuthanes Bearing Pyrazolato Ligands with
Very Short Bi–Bi Single Bonds. ACS Publications. Collection. https://doi.org/10.1021/acs.inorgchem.7b01902
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AUTHORS (6)
MZ
Ming-Gang Zhao
TH
Ting-Ting Hao
XZ
Xiang Zhang
JM
Jian-Ping Ma
JS
Ji-Hu Su
WZ
Wenjun Zheng