Dimerized p-Semiquinone Radical Anions Stabilized by a Pair of Rare-Earth Metal Ions

Tian Han; Jonatan B Petersen; Zi-Han Li; Yuan-Qi Zhai; Andreas Kostopoulos; Fabrizio Ortu; Eric J L McInnes; Richard E P Winpenny; Yan-Zhen Zheng

doi:10.1021/acs.inorgchem.0c00503

Dimerized p-Semiquinone Radical Anions Stabilized by a Pair of Rare-Earth Metal Ions

Inorg Chem. 2020 Jun 1;59(11):7371-7375. doi: 10.1021/acs.inorgchem.0c00503. Epub 2020 May 11.

Authors

Tian Han¹, Jonatan B Petersen², Zi-Han Li¹, Yuan-Qi Zhai¹, Andreas Kostopoulos², Fabrizio Ortu², Eric J L McInnes², Richard E P Winpenny², Yan-Zhen Zheng¹

Affiliations

¹ School of Science, Frontier Institute of Science and Technology, Research Institute of Xi'an Jiaotong University (Zhejiang), State Key Laboratory for Mechanical Behavior of Materials, MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, and Xi'an Key Laboratory of Sustainable Energy and Materials Chemistry, Xi'an Jiaotong University, Xi'an 710049, China.
² School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom.

PMID: 32392411
DOI: 10.1021/acs.inorgchem.0c00503

Abstract

Here we report stable p-quinone-radical-bridged rare-earth complexes involving the ligand tetramethylquinone (QMe₄^•-). The complexes, {Y[(QMe₄)^•-Cl₂(THF)₃]}₂ (1) and {Gd[(QMe₄)^•-Cl₂(THF)₃]}₂ (2), where THF = tetrahydrofuran, are sufficiently stable that we can measure the single-crystal structures and perform magnetic and electron paramagnetic resonance measurements. These studies show the presence of a semiquinone form and that the magnetic interaction between the radicals in the dimer is strong and antiferromagnetic.