Deuterium Substitution
Deuterium Substitution - Related Videos
00:48
¹H NMR of Labile Protons: Deuterium (²H) Substitution
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2024
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. Figure 1. The comparison of the proton NMR spectra of pure dry ethanol and the same in D2O solvent.
14:21
Nucleophilic Substitution
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2023
Source: Vy M. Dong and Daniel Kim, Department of Chemistry, University of California, Irvine, CA Nucleophilic substitution reactions are among the most fundamental topics covered in organic chemistry. A nucleophilic substitution reaction is one where a nucleophile (electron-rich Lewis base) replaces a leaving group from a carbon atom. SN1 (S = Substitution, N = Nucleophilic, 1 = first-order kinetics) SN2 (S = Substitution, N = Nucleophilic, 2 = second-order kinetics) This video will help to...
10:14
Object Substitution Masking
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2023
Source: Laboratory of Jonathan Flombaum—Johns Hopkins University Visual masking is a term used by perceptual scientists to refer to a wide range of phenomena in which in an image is presented but not perceived by an observer because of the presentation of a second image. There are several different kinds of masking, many of them relatively intuitive and unsurprising. But one surprising and important type of masking is called Object Substitution Masking. It has been a focus of research in vision...
02:31
Measuring the Kinetic Isotope Effect on Microbial Electron Transport Using Deuterium Oxide
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2025
Source: Tokunou, Y., et al, Electrochemical Detection of Deuterium Kinetic Isotope Effect on Extracellular Electron Transport in Shewanella oneidensis MR-1. J. Vis. Exp. (2018)This video demonstrates a whole-cell electrochemical method to assess how proton transfer affects extracellular electron transport (EET) in electroactive bacteria. By replacing protons with deuterons using deuterium oxide, the method measures changes in current to reveal a kinetic isotope effect, highlighting the role of...
07:15
Amide Hydrogen/Deuterium Exchange & MALDI-TOF Mass Spectrometry Analysis of Pak2 Activation
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Cited by 2 •
2011
MALDI-TOF mass spectrometry was successfully utilized to monitor the amide hydrogen/deuterium exchange in protein kinase Pak2 activation.
FAQs
The key comparison is between otherwise corresponding molecules that differ in whether a relevant hydrogen is replaced. Deuterium forms a slightly stronger bond and vibrates at a lower frequency than hydrogen. If the substitution changes the reaction rate, the difference is a kinetic isotope effect, providing evidence that the altered bond influences the reaction behavior.
Bond strength and vibrational frequency are the central physical variables. A stronger deuterium-containing bond does not behave identically to the corresponding hydrogen bond, and its lower vibrational frequency can change molecular behavior. These isotope-dependent changes let chemists investigate molecular dynamics rather than treating the labeled compound as chemically indistinguishable from the original.
Deuterium substitution supports nuclear magnetic resonance-based structural interpretation by producing labeled compounds that can be examined alongside their unlabeled counterparts. The isotope change gives chemists a deliberate way to alter molecular composition while retaining the same broader chemical framework. Comparing information from these forms can help connect observed NMR data with molecular structure.
Chemists introduce deuterium substitution into a molecule, examine how reaction behavior changes, and relate the observed difference to the isotope effect. Because replacement can alter rates through bond strength and vibration, the result helps identify whether the substituted hydrogen-containing bond influences the reaction process. This approach turns labeling into a mechanistic probe.
A deuterium label provides a way to follow atoms as a molecule moves through a synthetic or metabolic pathway. Chemists track the labeled portion through successive transformations, using its presence to determine how atoms are transferred or retained. This application helps connect individual reaction steps with the overall route taken by a compound.
Deuterium substitution supports several complementary research goals in chemistry and biology. Scientists use labeled compounds to investigate metabolic and synthetic pathways, examine molecular dynamics, and strengthen structural interpretation from nuclear magnetic resonance studies. These applications make isotope substitution useful both for testing chemical mechanisms and for tracking molecular behavior in complex research systems.