title: Isolable Diphosphorus-Centered Radical Anion and Diradical Dianion.
abstract: Two salts containing diphosphorus-centered radical anion 1(•-) and diradical dianion 1(2-••) were obtained by one- and two-electron reductions of an indenofluorene-bridging diphosphaalkene (1) with K and KC8, respectively. The salts have been characterized by electron paramagnetic resonance (EPR) spectroscopy, UV-vis absorption spectroscopy, and single-crystal X-ray diffraction analysis. EPR spectroscopy and theoretical calculations reveal that the spin density of the radicals mainly resides on the phosphorus atoms, and 1(2-••) has an open-shell singlet ground state. 1(•-) and 1(2-••) represent the first isolable and structurally characterized diphosphorus-centered radical anion and dianion.
authors.affiliation: State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing National Laboratory of Microstructures and ‡Center of Modern Analysis, Nanjing University , Nanjing 210093, P.R. China.
authors.forename: Gengwen
authors.initials: G
authors.lastname: Tan
authors.affiliation: State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing National Laboratory of Microstructures and ‡Center of Modern Analysis, Nanjing University , Nanjing 210093, P.R. China.
authors.forename: Shuyu
authors.initials: S
authors.lastname: Li
authors.affiliation: State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing National Laboratory of Microstructures and ‡Center of Modern Analysis, Nanjing University , Nanjing 210093, P.R. China.
authors.forename: Sheng
authors.initials: S
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing National Laboratory of Microstructures and ‡Center of Modern Analysis, Nanjing University , Nanjing 210093, P.R. China.
authors.forename: Yunxia
authors.initials: Y
authors.lastname: Sui
authors.affiliation: State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing National Laboratory of Microstructures and ‡Center of Modern Analysis, Nanjing University , Nanjing 210093, P.R. China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Zhao
authors.affiliation: State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing National Laboratory of Microstructures and ‡Center of Modern Analysis, Nanjing University , Nanjing 210093, P.R. China.
authors.forename: Xinping
authors.initials: X
authors.lastname: Wang