Video Experimental Relacionado

Updated: Jul 25, 2025

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy

Published on: September 17, 2017

Espectroscopia de RMN de estado sólido ópticamente mejorada

Federico De Biasi¹, Michael A Hope¹, Claudia E Avalos¹

¹Institut des Sciences et Ingenierie Chimiques, École Polytechnique Fedérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.

Journal of the American Chemical Society

|June 27, 2023

Resumen

Los investigadores lograron una mejora de la señal en masa de 16 veces en la RMN de protones en estado sólido (1H) utilizando polarización nuclear dinámica inducida fotoquímica mejorada ópticamente (foto-CIDNP). Este avance supera las limitaciones de las técnicas actuales de hiperpolarización para aplicaciones más amplias.

Área de la Ciencia:

Espectroscopia de resonancia magnética
La fotoquímica
RMN en estado sólido

Sus antecedentes:

La baja sensibilidad limita las aplicaciones de resonancia magnética nuclear (RMN).
La polarización nuclear dinámica inducida fotoquímicamente (foto-CIDNP) mejora las señales de RMN, pero es rara en sólidos.
La anterior foto-CIDNP en estado sólido se limitaba a núcleos de baja sensibilidad (13C, 15N).

Objetivo del estudio:

Para demostrar la espectroscopia de RMN de estado sólido 1H ópticamente mejorada.
Para lograr una hiperpolarización masiva en RMN de estado sólido utilizando foto-CIDNP.
Para superar las limitaciones de los núcleos de baja sensibilidad en la foto-CIDNP.

Principales métodos:

Foto-CIDNP utilizado en un sistema donante-cromóforo-aceptor en una solución congelada.
Se utiliza una irradiación láser continua a 450 nm.
Funciona con un alto campo magnético (0,3 T) y baja temperatura (85 K).

Principales resultados:

Logró la primera espectroscopia de RMN de estado sólido 1H ópticamente mejorada.
Se ha observado un aumento de la señal de 16 veces en 1 hora.
Difusión de espín demostrada que transmite la polarización a través de la muestra.

Conclusiones:

El foto-CIDNP puede utilizarse eficazmente para la hiperpolarización masiva de núcleos 1H abundantes en sólidos.
Este método ofrece una nueva estrategia para la RMN hiperpolarizada más allá de las técnicas convencionales.
Permite estudios químicos y estructurales avanzados previamente limitados por la sensibilidad a la RMN.

Más Videos Relacionados

Measuring Interactions of Globular and Filamentous Proteins by Nuclear Magnetic Resonance Spectroscopy NMR and Microscale Thermophoresis MST

Measuring Interactions of Globular and Filamentous Proteins by Nuclear Magnetic Resonance Spectroscopy NMR and Microscale Thermophoresis MST

Published on: November 2, 2018

High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy

High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy

Published on: October 9, 2020

Videos de Conceptos Relacionados

¹H NMR: Interpreting Distorted and Overlapping Signals

¹H NMR: Interpreting Distorted and Overlapping Signals

Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...

2D NMR: Overview of Heteronuclear Correlation Techniques

2D NMR: Overview of Heteronuclear Correlation Techniques

Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...

2D NMR: Homonuclear Correlation Spectroscopy (COSY)

2D NMR: Homonuclear Correlation Spectroscopy (COSY)

Homonuclear correlation spectroscopy, or COSY, is a 2-dimensional NMR technique that provides information about coupled protons. Typically, the geminal and vicinal coupling are observed. For example, consider the COSY spectrum of ethyl acetate, where its 1D proton NMR spectrum is plotted along the vertical and horizontal axes with their corresponding chemical shift scale. Three spots on the diagonal corresponding to the three peaks in the 1D proton spectrum are called diagonal peaks. The COSY...

2D NMR: Overview of Homonuclear Correlation Techniques

2D NMR: Overview of Homonuclear Correlation Techniques

Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...

NMR Spectroscopy: Spin–Spin Coupling

NMR Spectroscopy: Spin–Spin Coupling

The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...