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Spin transition complexes is a class of materials exhibiting electron states bistability, which may be used as molecular switches [1]. Spin transition in spin-crossover compounds is usually studied in the solid state by magnetometry. However, only a few methods exist for studies in solution. Routinely used Evans method measures magnetic susceptibility, but it can lead to significant error of estimate (up to 15 %) due to various method limitations. Here we propose an alternative technique for estimation of spin state populations based on analysis of chemical shifts temperature dependence.