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The polarized and unpolarized spectra of C0CI2 • 6H20 have been studied at room temperature and at liquid nitrogen temperature. The spectra have been fitted using axially elongated tetragonal distortion (Dih) symmetry with the ligand field parameters Dq = 954 K, Ds = 718.5 K, Dt = 228.5 K, the Racah parameter B = 853, and the ratio B/C = 4.323. A limited form of spin-orbit coupling indicates that = -170 K. The spectrum can be fitted reasonably using these parameters, although the site symmetry {C2h) must be used to explain the polarized spectra and some of the fine structure details. The split components of the 4T2g(F), and 2Tig(P) (both in Oh symmetry) are located, as well as some split components of other symmetries in the near infrared and ultraviolet.

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