N.V. Troshanin*, T.I. Bychkova **
Kazan Federal University, Kazan, 420008 Russia
E-mail: *nikita-vt@mail.ru, **Tamara.Bychkova@kpfu.ru
Received December 28, 2018
DOI: 10.26907/2542-064X.2019.1.31-41
For citation: Troshanin N.V., Bychkova T.I. Heteroligand cobalt(II) complexes with some aromatic acid hydrazides and L-histidine. Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki, 2019, vol. 161, no. 1, pp. 31–41. doi: 10.26907/2542-064X.2019.1.31-41. (In Russian)
Abstract
§іomplex formation in the ternary systems cobalt(II) – benzoic / p-methoxybenzoic / o-hydroxybenzoic acid hydrazide – L-histidine has been studied by the methods of spectrophotometry and mathematical modelling in the aqueous solutions with 1.0 mol dm–3 KNO3 as a background. The formation constants and spectral parameters of homo- and heteroligand complexes have been determined. It has been shown that the stability of the complexes formed with o-hydroxybenzoic acid hydrazide was higher than that with p-methoxybenzoic and benzoic acid hydrazides. Extra stabilization of the heteroligand complexes has been identified and interpreted. The quantum-chemical optimization of the cobalt(II) heteroligand complex structure containing the single-charged anionic form of o-hydroxybenzoic acid hydrazide and histidine zwitterion has been carried out.
Keywords: spectrophotometry, mathematical modelling, complex formation, cobalt(II), benzoic acid hydrazide, p-methoxybenzoic acid hydrazide, o-hydroxybenzoic acid hydrazide, L-histidine
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