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

Yukhnevich, G. V.; Tarakanova, E. G.; Sukhoverkhov, V. F.; Bykov, I. V.

doi:10.1007/s11172-007-0203-0

Russ Chem Bull

2007

DOI: 10.1007/s11172-007-0203-0

|View full text |Cite

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

G. V. Yukhnevich

E. G. Tarakanova

V. F. Sukhoverkhov

et al.

Abstract: 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… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...

Citation Types

Supporting

Mentioning

Contrasting

Year Published

2011

2016

Publication Types

Select...

Article2

Relationship

Self Cite1

Independent1

Authors

Journals

Cited by 2 publications

(1 citation statement)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[25][26][27][28][29][30][31][32] In these studies, new methodological approaches were developed. For example, two procedures adequate to the law of mass action 33 were developed for the determination of the sto ichiometric HF : Solv ratios in these HA.…”

mentioning

confidence: 99%

Composition and structure of heteroassociates formed in the HF-N, N-dimethylformamide binary liquid system

Tarakanova

Yukhnevich

2011

Russ Chem Bull

Self Cite

View full text Add to dashboard Cite

The concentration dependence of the normalized (to the total number of moles of the components per liter) absorbance of HF solutions in DMF in ratios from 1 : 12 to 7 : 1 was analyzed. In the binary liquid system (BLS) under consideration, there are molecular complex es with stoichiometric ratios of 1 : 1 and ≥ ≥ ≥ ≥ ≥10 : 1 along with heteroassociates (HA) with the HF to DMF ratio of 4 : 1, which have been found earlier. For each HA, the concentration range, in which HA is formed in BLS, was estimated, and the positions of the stretching bands of HF were determined. The optimal configurations and the vibrational frequencies of the molecular complexes (HF) m •(DMF) n (m = 1, 2, 4, 8; n = 1, 2) with different topologies were calculated using the density functional theory (B3LYP/6 31++G(d,p)). The relative stability and struc tural features of the latter complexes were investigated. The complex formation in the HF-DMF system was analyzed. The structures of HA with stoichiometric ratios of 1 : 1 and 4 : 1 were determined by comparing the results of calculations and experimental data.Hydrogen fluoride has the unique ability to form sol vates and complexes. 1 Its molecules are involved in nu merous stable heteroassociates (HA) with different struc tures, 1-32 which determine the chemical, physicochemi cal, and spectroscopic properties of HF containing sys tems. Comprehensive studies of these HA are of funda mental and practical interest due, in particular, to the fact that some HA can act as fluorinating agents. 1,3-6,14, 18 One of important goals in the solution chemistry is to determine the composition, structures, and the mecha nism of the formation of stable hydrogen bonded molecu lar complexes (HF) m •(Solv) n (Solv is an organic solvent) in the liquid phase. Chemical and physicochemical meth ods, 1,3-6,14,18,25-30 IR spectroscopy, 2,22,26-32 X ray dif fraction, and differential thermal analysis 12,13 are em ployed to obtain relevant information.The structural features and conditions of the forma tion of heteroassociates (HF) m •(Solv) n in binary liquid systems (BLS) were considered in experimental and com putational studies having common logic. 25-32 In these studies, new methodological approaches were developed. For example, two procedures adequate to the law of mass action 33 were developed for the determination of the sto ichiometric HF : Solv ratios in these HA. 25,26 One of these procedures is based on measurements of the concentra tion dependences of the normalized (to the total number of moles of the components of BLS per liter of the solu tion) excess density of the solution (Δρ/N, g mol -1 ) and the fact that, according to the law of mass action, the maximum in this dependence will be observed at the mo lar ratio of the components in the binary mixture corre sponding to the stoichiometric composition of HA. An alternative procedure 26 involves measurements of a series of normalized absorbance of solutions (A/N, L mol -1 ), the determination of the frequency regions, in which the absorption of molecular...

show abstract

mentioning

confidence: 99%

Composition and structure of heteroassociates formed in the HF-N, N-dimethylformamide binary liquid system

Tarakanova

Yukhnevich

2011

Russ Chem Bull

Self Cite

View full text Add to dashboard Cite

show abstract

Structure of hydrogen fluoride complexes with diethylketone in a HF–Et2CO solution

Tarakanova

Yukhnevich

2016

J Struct Chem

View full text Add to dashboard Cite

scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.

Contact Info

customersupport@researchsolutions.com

10624 S. Eastern Ave., Ste. A-614

Henderson, NV 89052, USA

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Blog Terms and Conditions API Terms Privacy Policy Contact Cookie Preferences Do Not Sell or Share My Personal Information

Made with 💙 for researchers

Part of the Research Solutions Family.

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

Cited by 2 publications

References 9 publications

Composition and structure of heteroassociates formed in the HF-N, N-dimethylformamide binary liquid system

Composition and structure of heteroassociates formed in the HF-N, N-dimethylformamide binary liquid system

Structure of hydrogen fluoride complexes with diethylketone in a HF–Et2CO solution

Contact Info

Product

Resources

About