Spectroscopic investigation of intramolecular hydrogen bonds in hydroxycarboxylic acids and their esters

Abramovich, M. A.; Ginzburg, Irith; Ioffe, D. V.

doi:10.1007/bf00524955

Cited by 4 publications

(3 citation statements)

References 11 publications

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“…3, trace b) shows two distinct bands at 1689 and 1736 cm Ϫ1 that were assigned to the benzoyl (A) and ester (B) groups. 17, 18 The strong conjugation between the keto group and the aromatic ring leads to a pronounced frequency redshift and a clear separation of the two bands. The above assignment, the redshift and the clear separation of the two bands are well reproduced by the DFT calculations.…”

Section: Carbonyl Spectra Of -Ketoestersmentioning

confidence: 99%

“…Although rotational isomerism (s-cis vs. s-trans) is very well known for certain classes of organic compounds only the conformation of methyl pyruvate 14 and pyruvoyl halides 15, 16 has received attention among the α-ketocarboxylic acid derivatives. An equilibrium between rotational isomers for some other ethyl α-ketoesters [17][18][19] has been postulated in an attempt to reveal the structures of 2-oxopropionic acid and phenylglyoxylic acid. Temperature dependence of the IR absorption band corresponding to the carbonyl stretching mode of ethyl pyruvate was reported by Yarkova et al 20 Dipole moment measurements were also carried out.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Conformational isomerism of α-ketoesters. A FTIR and ab initio study

Ferri¹,

Bürgi²,

Baiker³

2000

J. Chem. Soc., Perkin Trans. 2

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Section: Carbonyl Spectra Of -Ketoestersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Conformational isomerism of α-ketoesters. A FTIR and ab initio study

Ferri¹,

Bürgi²,

Baiker³

2000

J. Chem. Soc., Perkin Trans. 2

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“…Compared to other common carboxylic acids, pyruvic acid (2-oxopropanoic acid; PA) poorly associates in solution. An intramolecular Hbond bridges the a-keto group to the acidic proton [46]. The stability of the cis conformation of PA has been largely described in literature and refers to the position of the keto group relative to that of the OH [47 ± 49].…”

mentioning

confidence: 99%

Probing Catalytic Solid-Liquid Interfaces by Attenuated Total Reflection Infrared Spectroscopy: Adsorption of Carboxylic Acids on Alumina and Titania

Ferri

Bürgi

Baiker

2002

HCA

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Dedicated to Professor Dieter Seebach on the occasion of his 65th birthdayThe adsorption of carboxylic acids (formic, acetic, and pyruvic acid) from corresponding solutions in CH 2 Cl 2 solvent on Al 2 O 3 and TiO 2 thin films has been studied by attenuated total reflection infrared spectroscopy. The metal-oxide films were vapor-deposited on a Ge internal reflection element, which was mounted into a specially designed flow cell. The system allowed in situ monitoring of the processes occurring at the solid-liquid interface. The metal-oxide films were characterized by X-ray photoelectron spectroscopy, ellipsometry, and atomic force microscopy. Formic acid and acetic acid adsorbed predominantly as bridging species on alumina surfaces. Adsorbed free acids were not observed under a flow of neat solvent. Based on the position of the n AS (COO) and of the keto-group stretching vibration of the pyruvate ion, pyruvic acid is proposed to coordinate to the Al 2 O 3 surface in a monodentate fashion, whereas, on TiO 2 , a bidentate species is preferred. Comparison of the adsorption behavior on the vapor-deposited alumina film and on an a-Al 2 O 3 layer deposited from a water suspension of the corresponding metal-oxide powder indicated that pyruvic acid adsorbs in a similar mode, irrespective of the metal-oxide deposition technique.Introduction. ± Solid-liquid interfaces play fundamental roles in nature and technology. Many processes crucial for life occur at such interfaces and technical applications range from corrosion, tribology, electrochemistry over environmental chemistry to heterogeneous catalysis. Our knowledge of such important processes relies on techniques that probe the respective interfaces. The growing awareness that an interface may be quite different under working conditions than under conditions far away from these, has fostered the development of in situ methods. In the field of heterogeneous catalysis, important insight can be gained by monitoring the respective catalytic interface at work.Vibrational spectroscopy is ideally suited to probe interfaces [1] [2]. A vibrational spectrum contains detailed structural information of the adsorbate layer such as interaction mode between surface and adsorbate, orientation of the adsorbate and intermolecular interactions within the adsorbate layer. Furthermore, infrared radiation is noninvasive. The advances in vibrational spectroscopy of interfaces in the past few years went along with progress in instrumentation and data processing. Furthermore, the information contained in the measured spectra can now be read in more detail through comparison with calculations. The availability of sophisticated ab initio quantum-chemical programs and fast computers makes it possible to simulate spectra with predictive accuracy.

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