Application of infrared spectrometry to the study of tautomeric equilibria and hydrogen bonding basicity of medical and biochemical agents: N,N′-disubstituted amidines

The Analyst ◽  
1994 ◽  
Vol 119 (4) ◽  
pp. 683-687 ◽  
Author(s):  
Ewa D. Raczyńska ◽  
Christian Laurence ◽  
Michel Berthelot
Keyword(s):  
Hydrogen Bonding ◽  
Infrared Spectrometry ◽  
Tautomeric Equilibria

scholarly journals Anion control of tautomeric equilibria: Fe–H vs. N–H influenced by NH⋯F hydrogen bonding

2019 ◽  
Vol 10 (5) ◽  
pp. 1410-1418 ◽  
Author(s):  
Geoffrey M. Chambers ◽  
Samantha I. Johnson ◽  
Simone Raugei ◽  
R. Morris Bullock
Keyword(s):  
Hydrogen Bonding ◽  
Tautomeric Equilibria ◽  
Iron Hydride ◽  
P Addition

Addition of excess BF4− to the iron hydride [Fe(PEtNMePEt)(CO)3H]+[B(C6F5)4]− leads to the NH tautomer, due to NH⋯F hydrogen bonding.

Analysis of Nitrocresols and Related Compounds by Gas Chromatography/Matrix-Isolation Infrared Spectrometry

1995 ◽  
Vol 49 (3) ◽  
pp. 286-294 ◽  
Author(s):  
Jeffrey W. Childers ◽  
David F. Smith ◽  
Nancy K. Wilson ◽  
Ruth K. Barbour
Keyword(s):  
Gas Chromatography ◽  
Hydrogen Bonding ◽  
Matrix Isolation ◽  
Broad Band ◽  
Intramolecular Hydrogen Bonding ◽  
Infrared Spectrometry ◽  
Absorption Bands ◽  
Argon Matrix ◽  
Band Splitting ◽  
Matrix Interactions

The capabilities of gas chromatography/matrix-isolation infrared (GC/MIIR) spectrometry for characterizing nitrocresols in air sample extracts were evaluated. The IR spectra of selected nitrocresols were recorded in an argon matrix, in a xenon matrix, in the vapor phase, and in dilute CCl4 solution. The MIIR spectra of the nitrocresols that do not undergo intramolecular hydrogen bonding exhibited split OH stretching bands. Several factors that might cause band splitting, including aggregation, solute–matrix interactions, and the isolation of conformers, were investigated. The presence of aggregates was indicated by a broad band assigned to intermolecular hydrogen bonding in the MIIR spectra of 3-and 4-nitrocresol isomers deposited in an argon matrix at a matrix-to-solute ratio ≤ 283:1. The split OH absorption bands persisted, however, when there was no evidence of aggregate formation. The complexity of the split OH stretching bands was also influenced by steric factors and by the choice of matrix gas. This result suggests that isolation of rotational isomers and solute-matrix interactions also contribute to the band splitting. The presence of the split OH absorption bands did not preclude the use of the GC/MIIR technique to identify several nitrocresols produced from the photooxidation of toluene and NO x.

The significance of hydrogen bonding in electron solvation processes in ethanol-n-hexane liquid mixtures

1974 ◽  
Vol 27 (12) ◽  
pp. 2529 ◽  
Author(s):  
BJ Brown ◽  
NT Barker ◽  
DF Sangster
Keyword(s):  
Hydrogen Bonding ◽  
Ionizing Radiation ◽  
Free Electron ◽  
Liquid Mixtures ◽  
High Energy ◽  
Infrared Spectrometry ◽  
Electron Solvation ◽  
Electron Yield ◽  
Solvation Processes

Infrared spectrometry has been used to identify the quasi-stable associated alcohol complexes significant to electron solvation processes when ethanol-n-hexane liquid mixtures are subjected to high energy ionizing radiation. The solvated free electron yield is directly related to the square of the concentration of alcohol unimer species. This result has been interpreted in terms of the electron being solvated primarily by alcohol dimer.

Etude structurale et thermodynamique des interactions entre des dérivés chlorés et bromés du méthane et des amides tertiaires

1984 ◽  
Vol 62 (12) ◽  
pp. 2634-2640 ◽  
Author(s):  
J. M. Dumas ◽  
C. Geron ◽  
A. R. Kribii ◽  
M. Lakraimi
Keyword(s):  
Hydrogen Bonding ◽  
Organic Solvent ◽  
Halogen Bonding ◽  
Infrared Spectrometry ◽  
Dielectric Polarization ◽  
Tertiary Amides ◽  
Derivatives Of

A study by dielectric polarization, microcalorimetry, and infrared spectrometry has allowed us to demonstrate the role played by the halogen in interactions between a series of chlorinated and brominated derivatives of methane (considered as types of halogenated anesthetics) and two tertiary amides taken as models for an element of the membranes of the nervous cells. The inert organic solvent used was cyclohexane. The interactions are of the hydrogen bonding and (or) halogen bonding types.

Further insight into three center hydrogen bonding. Participation in tautomeric equilibria of heterocyclic amides

2001 ◽  
pp. 1817-1823 ◽  
Author(s):  
Itzia I. Padilla-Martínez ◽  
Francisco J. Martínez-Martínez ◽  
Efrén V. García-Báez ◽  
J. Martín Torres-Valencia ◽  
Susana Rojas-Lima ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Tautomeric Equilibria ◽  
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