A Crystalline Phosphaalkene Radical Anion
journal contributionposted on 16.07.2014, 00:00 by Xiaobo Pan, Xingyong Wang, Yue Zhao, Yunxia Sui, Xinping Wang
Salts containing phosphaalkene radical anions have been isolated and characterized by electron paramagnetic resonance (EPR) spectroscopy, UV–vis absorption spectroscopy, and single-crystal X-ray diffraction. The radical anions feature elongated P–C bonds and an aromatization of fulvene compared to the neutral phosphaalkene. Their EPR spectra and theoretical calculations indicate the spin density of the radicals mainly resides on phosphorus atoms. This work provides the first example of a crystalline phosphaalkene radical anion.