DOI: https://doi.org/10.24144/2414-0260.2018.2.24-30

ВИВЧЕННЯ КОМПЛЕКСОУТВОРЕННЯ У СИСТЕМІ Fe(II) – ГІДРОКСИЛАМІН

O. M. Ivashkovich, S. M. Sukharev

Анотація


We have received the complexes of iron (II) with hydroxylamine for first time. The experiments were carried out in anaerobic conditions in the atmosphere of nitrogen. Absolute alcohol (methanol) was used as solvent. Two complexes were received in the solution: a dark green one (pH 3-4) and brownish red one (pH 6.2-8.0). Complexes are unstable. The existence of a green complex of iron (II) with hydroxylamine at pH 3-4, due to the presence in the solution of the protonated form of hydroxylamine (NH3OH+, pKa = 6,06). The existence of a brownish red complex of iron (II) with hydroxylamine at pH 6.2-8.0 is evidently due to the existence of the molecular form of hydroxylamine (NH2OH), since at high pH values there is a hydroxylamine anion (NH2O-, pKa = 9,4) in the solution. The absorption spectrum of complexes have been taken. The spectrum character shows that the green composition is high spin and the red one is low spin complexes of Fe (II). The parameter 10Dq was found for the green complex: 10Dq = 9756 sm-1. The complexes have the octahedral slight tetragonal destroyed structure.

With an increase in the concentration of hydroxylamine in the solution in the range of pH 4-6, a mixture of complexes is present in the system. Therefore, the exact composition of the green and brownish red complexes cannot be established. It is possible that the green complex of iron (II) is mixed ligand – chloride-hydroxylamine, and red – hexahydroxylamine [Fe(NH2OH)6]Cl2.

The instability constant of brownish red complex have been counted with the help of Babko’s method: Kins = (2,86±0,36)´10-3.

Ключові слова


гідроксиламін; ферум(II); високоспиновий комплекс; низькоспіновий комплекс

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Посилання


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