Add time:08/14/2019         Source:sciencedirect.com

In this paper thermochromic features of cobalt(II) were investigated in the binary mixture containing inorganic salt (ammonium nitrate) and molecular solvent (N-methylformamide) in order to find responsive thermochromic medium for possible application in a greenhouses for auto-regulated shading and solar protection. Absorption spectra of cobalt(II) in the NH4NO3 + zNMF (z = 3, 4, 5, 6 and 20) binary mixtures were recorded in the visible wavelength range in the presence of different cobalt(II) and chloride concentrations at five selected temperatures: 308.15; 318.15; 328.15; 338.15 and 348.15 K. From the obtained spectra, geometry, composition and speciation of the complexes were discussed. Influences of the temperature and mixture composition on the absorption spectra were also analysed. From an analysis of the spectra using two computer programs, it was concluded that the following complexes were formed: [Co(NO3)4(NMF)2]2−, [CoCl3(NO3)(NMF)2]2−and [CoCl4]2−. For these complexes stability constants were determined at all temperatures. Thermodynamic parameters were also calculated using the temperature dependence of calculated stability constants.

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