Strong Hydrogen Bonds. II. The Hydrogen Difluoride Ion

Harrell, Samuel A.; McDaniel, Darl H.

doi:10.1021/ja01074a061

Cited by 70 publications

(21 citation statements)

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“…The strength of the hydrogen bond formed between HF and F -approximates that of a covalent bond. 21 An XPS analysis of our fluorinated SWNT product reveals an F 1s peak at a binding energy of 687 eV. Poly-(tetrafluoroethylene) has an F 1s binding energy of 691.5 eV.…”

Section: Resultsmentioning

confidence: 87%

Solvation of Fluorinated Single-Wall Carbon Nanotubes in Alcohol Solvents

et al. 1999

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Highly purified single-wall carbon nanotubes (SWNTs) were fluorinated to form "fluorotubes", which were then solvated as individual tubes in various alcohol solvents via ultrasonication. The solvation of individual fluorotubes was verified by dispersing the tubes on a mica substrate and examining them with atomic force microscopy (AFM). Elemental analysis of the tubes reveals that light sonication in alcohol solvents does not remove significant amounts of the fluorine. While these solutions are metastable, they will persist long enough (over a week) to permit solution-phase chemistry to be carried out on the fluorotubes. For example, the solvated fluorotubes can be precipitated out of solution with hydrazine to yield normal, unfluorinated SWNTs, or they can be reacted with sodium methoxide to yield what are apparently methoxylated SWNTs. These reaction products have been examined with elemental analysis and a variety of spectroscopies and microscopies.

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Section: Resultsmentioning

confidence: 87%

Solvation of Fluorinated Single-Wall Carbon Nanotubes in Alcohol Solvents

et al. 1999

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“…The ion source in that work was 10 kcal/mol greater than that obtained with contains a suitable reaction mixture. The resulting ions rcact with the ~~~~~i~l '~ assumption (6). ~~~~~~l~, L~~~~~ and M~M~~~~ gas molecules and under suitable conditions the desired ion-molecule (9, lo), using ion cyclotron resonance (ICR) to measure the gas equilibria establish themselves.…”

Section: Methodsmentioning

confidence: 99%

“…Better conditions for the equilibria measurements were created with the introduction of SO2 gas in the reaction mixture. The presence of SO2 led to the clustering reactions [5] and [6]. Can.…”

Section: Reaction Mechanisms In Equilibria Measurements and Thermodynmentioning

confidence: 99%

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The hydrogen bond energies of the bihalide ions XHX⁻ and YHX⁻

Caldwell¹,

Kebarle²

1985

Can. J. Chem.

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This paper is dedicated to Professor Camille Sandor-or1 the occc~sion of his 65th birtlzdayG. CALDWELL and P. KEBARLE. Can. J. Chem. 63, 1399Chem. 63, (1985.Experimental measurements of the gas phase ion equilibria X + HX = XHX-, X-(HX),,, + HX = X-(HX),,, and X-+ HY = XHY where X, Y = C1, Br. I, with a high pressure mass spectrometer, combined with the recent determination of F-+ HF = FHF-by Larson and McMahon, provide a very complete set of hydrogen bond dissociation enthalpies and free energies for the hydrogen bihalide ions. The bond energy trends In the different XHX-and X H Y are discussed. The data can be used also for the evaluation of lattice energies of salts containing the bihalide ions and for determinations of the solvation energies of these ions. [Traduit par le journal]

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“…6 Recent examples of linear foldamers and heterodimers that are stabilised by N-HÁ Á ÁF hydrogen bonding support the notion that organofluorine fragments can also be utilised as a hydrogen bonding acceptor (HBA) for the assembly of higher-order structures. 7 Undoubtedly, the charged F À anion is a strong HBA, 8 but the ability of covalently bound fluorine atom, as present in the C-F group, to function as an effective HBA still remains controversial. [9][10][11][12] Statistical analysis on crystallographically determined structures suggests, however, that C-HÁ Á ÁF interactions could be as important as C-HÁ Á ÁO or C-HÁ Á ÁN hydrogen bonds.…”

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confidence: 99%