Single-crystal polarized electronic spectra of the pentakis(2-picoline N-oxide)cobalt(II) perchlorate complex

Single-crystal polarized electronic spectra of the pentakis(2-picoline N-oxide)cobalt(II) perchlorate complex, [Co(C6- H7NO)s](C104)z, have been recorded for a crystal modification, the structure of which has been determined. The crystals are monoclinic, space group P21/c, with cell dimensions a = 10.223 (3) A, b = 9.659 (3) A, c = 38.195 (12) A, p = 107.92 ( 3 ) O , and Z = 4. The structure was refined to an R factor of 0.076. Assignment of the transitions on the basis of a C2> symmetry is proposed and the energies of the electronic levels are discussed in terms of ligand field and angular overlap parameters