Abstract
Influence of solvent composition, i.e. the salt mole fraction and water content on absorption spectra of cobalt(II) chloride and nitrate in xCa(NO 3) 2· zH 2O–(1 − x)NH 4NO 3 systems was investigated by spectrophotometric method in the wavelength range 400–800 nm at 55 °C. On the basis of absorption spectra of cobalt(II) chloride and nitrate complexes and overall molar absorption coefficients obtained in 13 investigated systems, the geometry of the complexes formed was studied. Comparing of these spectra with those obtained in anhydrous melts and aqueous solutions, possible coordination of water molecules with cobalt(II) and formation of mixed complexes was considered.
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