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The reaction of [RuCl3(NO)(PPh3)2] complex with pyrazole has been examined. The new ruthenium complex – [RuCl3(NO)(PPh3)(C3 H4N2)] has been obtained and characterised by IR and UV–Vis measurements. Crystal, molecular and electronic structures of the complexes have been determined. The electronic spectrum of the complex was calculated by the TDDFT method.