Thermochromic behaviour and cobalt(II) bromide complex equilibrium in low temperature melting acetamide-ammonium nitrate-water mixtures

► Absorption spectra of cobalt bromide in ammonium nitrate - acetamide - water melts. ► Molar absorption coefficient of cobalt bromide solutions increases with temperature. ► Stability constants for Co-bromide, Co-nitrate and mixed complexes calculation. ► Co-bromide complex formation tendency decreases with an increase of water content.