Publications de Yu Rao | EPFL Graph Search

Systematic Evaluation of Polarizing Agents for Dynamic Nuclear Polarization Enhanced NMR

David Lyndon Emsley, Yu Rao, Yuxuan Zhang

Dynamic nuclear polarization (DNP) can significantly enhance the sensitivity of NMR spectroscopy, via the transfer of polarization from unpaired electrons to nuclei. As a result, there is considerable interest in improving DNP efficiency, particularly thro ...

Wiley2025

Surface enhanced nuclear magnetic resonance spectroscopy at solid-liquid interfaces using Overhauser dynamic nuclear polarization

Marinella Mazzanti, David Lyndon Emsley, Yu Rao, Pragati Pandey

While solid-liquid interfaces are ubiquitous, detecting the associated surface sites under ambient conditions remains a grand challenge. Previously, we demonstrated the hyperpolarization by Overhauser effect dynamic nuclear polarization (OE-DNP) of ligands ...

American Chemical Society (ACS)2025

Superconducting microwave oscillators as detectors for ESR spectroscopy

Giovanni Boero, Jürgen Brugger, Yu Rao, Reza Farsi

Microwave superconducting resonators are extensively studied in fields such as quantum computing and electron spin resonance (ESR) spectroscopy. However, the integration of superconducting resonators with feedback mechanisms to create ultra-low noise oscil ...

2025

Solid Effect Dynamic Nuclear Polarization Enhancement of >500 at 9.4 T

David Lyndon Emsley, Yu Rao, Amrit Venkatesh

Efficient polarizing agents for dynamic nuclear polarization (DNP) enhanced magic angle spinning (MAS) NMR spectroscopy is of high current interest due the potential to significantly boost NMR sensitivity. While most efforts have centered on cross-effect ( ...

American Chemical Society (ACS)2024

Observation of Transient Prenucleation Species of Calcium Carbonate by DNP-Enhanced NMR

David Lyndon Emsley, Gabriele Stevanato, Martins Balodis, Yu Rao, Mattia Negroni

Knowledge of the mechanism by which polymorphic inorganic species, such as carbonates, are formed is crucial to understand and guide the selective crystallization of end products. Recently it has been shown that a key step in the crystallization of calcium ...

2024

Probing Homogeneous Catalysts and Precatalysts in Solution by Exchange-Mediated Overhauser Dynamic Nuclear Polarization NMR

David Lyndon Emsley, Yu Rao, Federico De Biasi

Published by American Chemical Society.Triphenylphosphine (PPh3) is a ubiquitous ligand in organometallic chemistry that has been shown to give enhanced 31P NMR signals at high magnetic field via a scalar-dominated Overhauser effect dynamic nuclear polariz ...

2024

Rational Design of Dinitroxide Polarizing Agents for Dynamic Nuclear Polarization to Enhance Overall NMR Sensitivity

David Lyndon Emsley, Yu Rao, Amrit Venkatesh

We evaluate the overall sensitivity gains provided by a series of eighteen nitroxide biradicals for dynamic nuclear polarization (DNP) solid-state NMR at 9.4 T and 100 K, including eight new biradicals. We find that in the best performing group the factors ...

Wiley-VCH Verlag GmbH2024

Development of Dynamic Nuclear Polarization Methods in Solution- and Solid-State NMR

Yu Rao

NMR spectroscopy is a very powerful tool for investigating chemical systems at the atomic level because of its ability to provide information on the local environment and dynamics of the nuclei. Because of this, NMR has become one of the most popular analy ...

EPFL2024

Deuterated TEKPol Biradicals and the Spin-Diffusion Barrier in MAS DNP

Dominik Józef Kubicki, David Lyndon Emsley, Yu Rao, Amrit Venkatesh, Federico De Biasi

The sensitivity of NMR spectroscopy is considerably enhanced by dynamic nuclear polarization (DNP). In DNP polarization is transferred from unpaired electrons of a polarizing agent to nearby proton spins. In solids, this transfer is followed by the transpo ...

Wiley-VCH Verlag GmbH2023

Design Principles for the Development of Gd(III) Polarizing Agents for Magic Angle Spinning Dynamic Nuclear Polarization

Anne-Sophie Chauvin, Marinella Mazzanti, David Lyndon Emsley, Gabriele Stevanato, Yu Rao, Amrit Venkatesh

Nuclear magnetic resonance suffers from an intrinsically low sensitivity, which can be overcome by dynamic nuclear polarization (DNP). Gd(III) complexes are attractive exogenous polarizing agents for magic angle spinning (MAS) DNP due to their high chemica ...

2022

H-1 Hyperpolarization of Solutions by Overhauser Dynamic Nuclear Polarization with C-13-H-1 Polarization Transfer

David Lyndon Emsley, Yu Rao, Pinelopi Moutzouri, Amrit Venkatesh

Dynamic nuclear polarization (DNP) is a method that can significantly increase the sensitivity of nuclear magnetic resonance. The only effective DNP mechanism for in situ hyperpolarization in solution is Overhauser DNP, which is inefficient for H-1 at high ...

2022

Open and Closed Radicals: Local Geometry around Unpaired Electrons Governs Magic-Angle Spinning Dynamic Nuclear Polarization Performance

Dominik Józef Kubicki, Manuel Cordova, David Lyndon Emsley, Gabriele Stevanato, Yu Rao, Georges Guévork Jean-Jacques Menzildjian, Moreno Lelli

The development of magic-angle spinning dynamic nuclear polarization (MAS DNP) has allowed atomic-level characterization of materials for which conventional solid-state NMR is impractical due to the lack of sensitivity. The rapid progress of MAS DNP has be ...

2020

Dynamic Nuclear Polarization Enhancement of 200 at 21.15 T Enabled by 65 kHz Magic Angle Spinning

David Lyndon Emsley, Gabriele Stevanato, Snaedis Björgvinsdóttir, Yu Rao, Pierrick Berruyer, Andrea Bertarello, Moreno Lelli

Solid-state nuclear magnetic resonance under magic angle spinning (MAS) enhanced with dynamic nuclear polarization (DNP) is a powerful approach to characterize many important classes of materials, allowing access to previously inaccessible structural and d ...

2020