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Updated: Feb 9, 2026

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
Published on: August 6, 2018
An Isolable Diphosphene Radical Cation Stabilized by Three-Center Three-Electron π-Bonding with Chromium: End-On
Wenqing Wang1, Cong-Qiao Xu2, Yong Fang1
1State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210023, China.
Abstract:
Two salts (2 and 4) containing the radical cations of complexed diphosphenes have been isolated and characterized by electron paramagnetic resonance (EPR) spectroscopy, IR spectroscopy, and single-crystal X-ray diffraction. The P-P bond is coordinated to the Cr center either in an end-on (in 2) or a side-on (in 4) fashion. The spin density of the radical is delocalized over the Cr atom and the two P atoms in 2 whereas the unpaired electron is mainly localized on the Cr atom in 4. This work provides the first example of a complexed diphosphene radical (2) featuring novel three-center three-electron (3c-3e) π-bonding in the Cr-P-P unit, and the first example of a 17 e Cr radical with a side-on π-bonded ligand (4).
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