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¹H NMR of Labile Protons: Deuterium (²H) Substitution

¹H NMR of Labile Protons: Deuterium (²H) Substitution

This lesson illustrates the role of deuterium substitution in simplifying the NMR spectrum of compounds comprising labile protons. One method employed is the use of deuterium. Amongst the three isotopes of hydrogen, deuterium (2H) has a nucleus composed of one proton and one neutron. When the D2O solvent is added to a pure dry ethanol solution, its labile proton is substituted with deuterium.

Hydrogen Bonds

Hydrogen Bonds

A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...

Hydrogen Bonds

Hydrogen Bonds

Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared.

Hess's Law

Hess's Law

There are two ways to determine the amount of heat involved in a chemical change: measure it experimentally, or calculate it from other experimentally determined enthalpy changes. Some reactions are difficult, if not impossible, to investigate and make accurate measurements for experimentally. And even when a reaction is not hard to perform or measure, it is convenient to be able to determine the heat involved in a reaction without having to perform an experiment.

Molecular Orbital Theory II

Molecular Orbital Theory II

Molecular Orbital Energy Diagrams

Inductive Effects on Chemical Shift: Overview

Inductive Effects on Chemical Shift: Overview

The protons in unsubstituted alkanes are strongly shielded with chemical shifts below 1.8 ppm. Methine, methylene, and methyl protons appear at approximately 1.7, 1.2 and 0.7 ppm, while the proton signal from methane appears at 0.23 ppm. An electronegative substituent, such as chlorine, withdraws the electron density from the protons, increasing their chemical shift. Progressive substitution of the hydrogens in methane by chlorine shifts the proton signals increasingly downfield, to 3.05 ppm in...

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Updated: May 12, 2026

A Hydrogen-Deuterium Exchange Mass Spectrometry (HDX-MS) Platform for Investigating Peptide Biosynthetic Enzymes

A Hydrogen-Deuterium Exchange Mass Spectrometry (HDX-MS) Platform for Investigating Peptide Biosynthetic Enzymes

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H/D isotope effects in hydrogen bonded systems.

Lucjan Sobczyk¹, Monika Obrzud, Aleksander Filarowski

¹Faculty of Chemistry, University of Wrocław, Joliot-Curie 14, 50-383 Wrocław, Poland. lucjan.sobczyk@chem.uni.wroc.pl

Molecules (Basel, Switzerland)

|April 18, 2013

Summary

The H/D isotope effect in hydrogen bonds is linked to diverse potential shapes and tunneling. This effect is most evident in infrared spectra, showing unusual isotopic ratios in critical correlation ranges.

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Area of Science:

Physical Chemistry
Spectroscopy
Solid State Physics

Background:

Hydrogen bonds exhibit significant H/D isotope effects due to proton/deuteron motion.
Potential energy surfaces for proton/deuteron motion are diverse, influenced by anharmonicity and tunneling.

Purpose of the Study:

To explore the relationship between potential shape diversity and the H/D isotope effect in hydrogen-bonded systems.
To analyze the manifestations of the H/D isotope effect across various spectroscopic techniques.

Main Methods:

Analysis of proton/deuteron motion potentials, including six extreme shapes.
Examination of infrared absorption spectra, particularly the isotopic ratio (nH/nD) versus absorption band position.
Investigation of Nuclear Quadrupole Resonance (NQR) and Nuclear Magnetic Resonance (NMR) spectra.

Main Results:

A critical range for the H/D isotope effect is identified, where the isotopic ratio can exceed typical values.
Stepwise changes in NQR frequencies (up to 1.1 MHz) are observed in the critical region.
Maximal isotope effects in NMR correlate with the dependence of Δd (¹H,²H) on d (¹H) and the correlation between dH and ΔpKa.

Conclusions:

The H/D isotope effect in hydrogen bonds is strongly dependent on the potential energy surface for proton/deuteron motion.
Infrared, NQR, and NMR spectroscopy are valuable tools for characterizing these isotope effects.
Further research is needed on the influence of isotopic substitution on dielectric properties of hydrogen bonds.