title: A boron-centered radical: a potassium-crown ether stabilized boryl radical anion.
abstract: A boron radical contact ion-pair Mes2B{4-(3,5-dimethylpyridinyl)}K(18-crown-6)(THF) (1K) has been isolated and characterized by electron paramagnetic resonance (EPR) spectroscopy, UV-vis absorption spectroscopy and single crystal X-ray diffraction. The geometry, bonding and spin density distribution are shown to be affected by the NK interaction. The unpaired electron resides mainly on the boron atom and falls between those of triarylboron radical anions and neutral boron radicals. The work provides a novel boron-centered radical intermediate, connecting anionic and neutral boryl radicals.
authors.affiliation: State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China. xpwang@nju.edu.cn.
authors.forename: Ningning
authors.initials: N
authors.lastname: Yuan
authors.affiliation: State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China. xpwang@nju.edu.cn.
authors.forename: Wenqing
authors.initials: W
authors.lastname: Wang
authors.affiliation: Collaborative Innovation Center of Chemistry for Energy Materials, CAS Key Laboratory of Mechanical Behavior and Design of Materials, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, Anhui 230026, China. jiangj1@ustc.edu.cn.
authors.forename: Ziye
authors.initials: Z
authors.lastname: Wu
authors.affiliation: State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China. xpwang@nju.edu.cn.
authors.forename: Sheng
authors.initials: S
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China. xpwang@nju.edu.cn.
authors.forename: Gengwen
authors.initials: G
authors.lastname: Tan
authors.affiliation: State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China. xpwang@nju.edu.cn.
authors.forename: Yunxia
authors.initials: Y
authors.lastname: Sui
authors.affiliation: State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China. xpwang@nju.edu.cn.
authors.forename: Xinping
authors.initials: X
authors.lastname: Wang
authors.affiliation: Collaborative Innovation Center of Chemistry for Energy Materials, CAS Key Laboratory of Mechanical Behavior and Design of Materials, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, Anhui 230026, China. jiangj1@ustc.edu.cn.
authors.forename: Jun
authors.identifier: http://orcid.org/0000-0002-6116-5605
authors.initials: J
authors.lastname: Jiang
authors.affiliation: Department of Chemistry, University of California, Davis, CA 95616, USA. pppower@ucdavis.edu.
authors.forename: Philip P
authors.initials: PP
authors.lastname: Power