Muon radical states in some electron donor and acceptor molecules

Muon radical states were studied in the electron donor molecules TTF and BE DT-TTF and in the electron acceptor molecule TCNQ. Muonium addition to doub le bond carbon sites results in hyperfine coupling contants ranging from 35 0 MHz in TTF down to 80 MHz for TCNQ. In TTF and BEDT-TTF additional radica l states with extremely low hyperfine coupling constants in the 5 MHz regio n are observed; these are assigned to muon addition at sulphur sites accomp anied by C-S bond cleavage. Copyright (C) 2000 John Wiley & Sons, Ltd.