Influence of isomorphous cation and anion substitution on optical spectra of cobalt alkylaminehalide crystals

Based on data of spectral investigations of crystals with the group A₂CoCl₄ (A=NH₂(C₂H₅) ₂ ⁺ , N(C₂H₅) ₄ ⁺ , N(CH₃) ₄ ⁺ ) and N(C₂H₅)₄]₂CoCl₂Br₂, the identification of absorption bands corresponding to internal electron transitions in a Co²⁺ ion has been carried out. The values of the crystalline field force Dq for the above-indicated materials at room temperature have been determined. The regularities of the change in the given parameter with change in the temperature and isomorphous cation-anion substitution have been established. It is shown that substitution of chlorine ions by bromine ions in the N(C₂H₅)₄]₂CoCl₂Br₂ solid solution leads to the formation of distorted tetrahedral complexes CoCl₂Br₂. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 67, No. 1, pp. 91–95, January–February, 2000.