The Borderline between Reactivity and Pre‐reactivity of Binary Mixtures of Gaseous Carboxylic Acids and Alcohols

Evangelisti, Luca; Spada, Lorenzo; Li, Weixing; Vazart, Fanny; Barone, Vincenzo; Camináti, Walther

doi:10.1002/ange.201612231

Cited by 6 publications

(1 citation statement)

References 33 publications

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“…19 The discussion of the role of hydrogen-bonded complexes in chemical reactions, as a rule, comes down to the fact that they can be pre-reactional complexes, formed by monomeric molecules of reactants. [20][21][22] Reactant molecules can exist as homoassociates and mixed hydrogen-bonded complexes. For example, if we consider any reactions involving phenol in the presence of water, then monomeric phenol molecules, its homoassociates, and mixed complexes of phenol with water can participate in the reactions.…”

Section: Introductionmentioning

confidence: 99%

Reactivity of hydrogen-bonded complexes of water, methanol, phenol and methyl amine

Samuilov,

Samuilov

2023

New J. Chem.

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Section: Introductionmentioning

confidence: 99%

Reactivity of hydrogen-bonded complexes of water, methanol, phenol and methyl amine

Samuilov,

Samuilov

2023

New J. Chem.

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The Barrier to Proton Transfer in the Dimer of Formic Acid: A Pure Rotational Study

Evangelisti

Gou

et al. 2018

Angewandte Chemie

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The Barrier to Proton Transfer in the Dimer of Formic Acid: A Pure Rotational Study

Evangelisti

Gou

et al. 2018

Angew Chem Int Ed

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The rotational spectra of three C-deuterated isotopologues of the dimer of formic acid have been measured, thanks to the small dipole moment induced by asymmetric H! Ds ubstitution(s). Fort he DCOOH-HCOOH species,t he concerted double proton transfer of the two hydroxy hydrogen atoms takes place between two equivalent minima and generates at unneling splitting of 331.2(6) MHz. This splitting can be reproduced by a3Dmodel with abarrier of 2559 cm À1 (30.6 kJ mol À1 )aso btained from theoretical calculations.Carboxylic acids form considerably stable dimers,t hat are sufficiently abundant at experimental conditions in as upersonic jet expansion. An umber of molecular complexes involving carboxylic acids [1][2][3][4][5][6][7][8][9][10] have been investigated by rotational spectroscopy,t ou nderstand the nature of their non-covalent interactions and to have information on their internal dynamics and on their conformational equilibria. Much attention has been paid to the complexes of carboxylic acids,m ainly to their dimers [1] and to their adducts with water. [2] Plenty of data have been obtained on the hydrogenbonded dimers involving proton tunneling,t he Ubbelohde effect and conformational equilibria. [1] HCOOH (formic acid; FA)isthe prototype of the carboxylic acids family and for this reason it is involved in most of the investigations of carboxylic acids bonded to molecules containing other functional groups, such as its adducts with H 2 O, [2a] N(CH 3 ) 3 , [3] CO 2 , [4] thesimplest aldehyde CH 2 O, [5] thesimplest amide H(CO)NH 2 , [6] ethers, [7] ketones, [8] freons, [9] azines [10] and its reactivity with alcohols. [11] An interesting feature of the dimer of FA,( FA) 2 ,i st he concerted transfer of the two hydroxylic protons,amotion in ad ouble minimum potential. It can generate tunneling doubling observable in molecular spectra, and makes them useful to studies of the tunneling process.T he precise tunneling splittings (DE 01 )m easured by microwave (MW) spectroscopy for the acrylic acid dimer [1g] and for the formic acid-benzoic acid bi-molecule [1h] have been reproduced by model calculations with barriers at or close to values obtained ab initio.In Figure 1w es how the proton transfer motion in the formic acid dimer along as ymmetric double minimum potential energy profile.

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The Borderline between Reactivity and Pre‐reactivity of Binary Mixtures of Gaseous Carboxylic Acids and Alcohols

Cited by 6 publications

References 33 publications

Reactivity of hydrogen-bonded complexes of water, methanol, phenol and methyl amine

Reactivity of hydrogen-bonded complexes of water, methanol, phenol and methyl amine

The Barrier to Proton Transfer in the Dimer of Formic Acid: A Pure Rotational Study

The Barrier to Proton Transfer in the Dimer of Formic Acid: A Pure Rotational Study

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