91669-22-6Relevant academic research and scientific papers
Site-selective bimodal absorption and emission of distonic radical cation
Tojo, Sachiko,Fujitsuka, Mamoru,Majima, Tetsuro
, p. 3618 - 3625 (2010)
Figure presented An acyclic 1,4-distonic dimer radical cation (DAE 2+) was generated from the dimerization of 1,1-bis(4-methoxyphenyl)ethylene radical cation (DAE+) with the neutral molecule (DAE) in solution. The absorption spectrum of DAE 2+ shows bimodal absorption bands with peaks at 350 and 500 nm corresponding to the 1,1-bis(4-methoxyphenyl)ethyl radical (An 2CCH3) and 1,1-bis(4-methoxyphenyl)ethyl cation (An2C+CH3), respectively. Therefore, DAE2+ in the ground state has the spin and positive charge localized on the 1- and 4-positions, respectively. The bimodal characteristic emissions by the site-selective excitation of radical and cation sites of DAE2+ were observed at 77 K, showing that the excitation energy is localized on the radical or cation site of DAE 2+ in the excited state. The interaction between radical and cation sites of DAE2+ in the ground and excited states are discussed on the basis of the steady-state spectroscopic and transient absorption measurements, as well as theoretical calculations.
