Behavior of $Co^{2+}$ Cations in the Aqueous and Alcoholic Solution of $CoCl_2 \cdot 6H_2O$

We investigated the optical properties of $Co^{2+}$ cations in the aqueous and alcoholic solution of $CoCl_2 \cdot 6H_2O$ at room temperature. We measured the absorption spectra of these solutions in the spectral region 395-800 nm. The Racah parameters and the exchange integrals of the aqueous complex $[Co(H_2O)_6]^{2+}$ are calculated. The parameters $D_{t}$ and $D_{s}$ are also calculated on the basis of our experimental data. The parameters δ σ and δπ which are connected with the symmetry of this complex are also determined.