Europium-151 Mössbauer Effect Study of Relaxation in Two Bi(pentamethylcyclopentadienyl) Europium(II) Complexes

Europium-151 Mössbauer spectra of two bis(pentamethylcyclopentadienyl) europium complexes have been recorded at 78K. The broad spectra with linewidths of 14.2 and 11.6 mm/s, and with isomer shifts of -12.5 and -12.8 mm/s, relative to EuF3 may be understood in terms of spherical relaxation of the effective hyperfine field