IR spectroscopic analysis of the composition of heterocomplexes formed in a binary system

Yukhnevich, G. V.; Tarakanova, E. G.

doi:10.1134/s0030400x06110099

Cited by 10 publications

(11 citation statements)

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“…16 However, it should be mentioned that in the earlier studied binary mixtures the intensities of the band at ~1800 cm -1 and continuous absorption, which is traditionally measured at 2100±100 cm -1 (see, e.g., Ref. 20), change in parallel with an increase in the fraction of HF.…”

Section: Resultsmentioning

confidence: 98%

“…15, 16 For graphical presentation of the both dependences, the logarithm of the mole ratio of components of the binary mixture was put in the ab scissa. The experimental values of the normalized excess density of the solution and its optical density were approximated by the Lorentz functions.…”

Section: Methodsmentioning

confidence: 99%

“…The results of this search are published. 15, 16 The first of these publica tions is devoted to the correction of the known method for determination of the composition of associates formed in two component mixtures, 7 and a basically new method was developed in the second study. The appearance of these methods extended appreciably possibilities for find ing stoichiometric ratios of molecules in HA.…”

mentioning

confidence: 99%

“…The method for finding the HA composition based on an analysis of the concentration dependence of the IR spectra and adequate to the law of mass action was proposed 16 and tested for three BLS (HF-DMF, HF-Me 2 CO, and HF-MeCN). This method is more universal than that considered above, 15 because is makes it possible to determine the composition of HA with both strong and weak intermolecular bonds and to study two component systems in the liquid, solid, and gaseous phases.…”

mentioning

confidence: 99%

“…16 When choosing the objects, we took into ac count both the structure and proton affinity of solvent molecules, which are of interest in searching for the rela tionship of the properties of a Solv molecule to the HA structure, and practical significance of the both systems, especially Olah´s reagent widely used in nucleophilic halo and hydrofluorination.…”

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Composition of heteroassociates formed in HF-pyridine and HF-formamide binary liquid systems

et al. 2007

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The IR spectra and the densities of solutions in HF-pyridine and HF-formamide binary liquid systems were measured over a wide range of mole ratios HF : Solv (Solv is the organic solvent). The composition of heteroassociates (HA) formed in these systems was determined by analysis of the concentration dependences of normalized (to the total number of moles per 1 L) optical density in the IR region and the excess density of the binary mixtures under study. The HA with the stoichiometric ratio 3 : 1 are present in the HF-Py system at all studied mole ratios of the components (from 1 : 12 to 20 : 1). The 1 : 2 HA were found in the dilute solutions, whereas the >6 : 1 HA were revealed in the concentrated solutions. The HA with the stoichio metric ratio 4 : 1 were found in HF-formamide system. The results obtained were compared with the known data on the composition of HA formed in the binary liquid systems HF-DMF, HF-Me 2 CO, and HF-MeCN.

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Section: Resultsmentioning

confidence: 98%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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