MAGNETIC CIRCULAR-DICHROISM AND ABSORPTION-SPECTRA OF LUTETIUM BIS(PHTHALOCYANINE) ISOLATED IN AN ARGON MATRIX

The magnetic circular dichroism (MCD) and absorption spectra of luteti um bis(phthalocyanine) (LuPc(2)) are reported in an argon matrix at si milar to 7 K over the range 5 000-60 000 cm(-1). The better spectral r esolution of the species isolated in an argon matrix, combined with de termination of excited-state symmetries by MCD, permits an assignment of the main electronic transitions. The experimental data are compared with the valence effective Hamiltonian calculations of Orti et al. an d the localized orbital calculations of Ishikawa et al. The spectra su pport the view that LuPc(2) is a delocalized mixed-valence system.