Improved strategies for DNP-enhanced 2D 1H-X heteronuclear correlation spectroscopy of surfaces
We demonstrate that dynamic nuclear polarization (DNP)-enhanced 1H-X heteronuclear correlation (HETCOR) measurements of hydrogen-rich surface species are better accomplished by using proton-free solvents. This approach notably prevents HETCOR spectra from being obfuscated by the solvent-derived signals otherwise present in DNP measurements. Additionally, in the hydrogen-rich materials studied here, which included functionalized mesoporous silica nanoparticles and metal organic frameworks, the use of proton-free solvents afforded higher sensitivity gains than the commonly used solvents containing protons. We also explored the possibility of using a solvent-free sample formulation and the feasibility of indirect detection in DNP-enhanced HETCOR experiments.
This is an article from Kobayashi, Takeshi, Frédéric A. Perras, Umesh Chaudhary, Igor I. Slowing, Wenyu Huang, Aaron D. Sadow, and Marek Pruski. "Improved strategies for DNP-enhanced 2D 1 HX heteronuclear correlation spectroscopy of surfaces." Solid State Nuclear Magnetic Resonance (2017). doi: 10.1016/j.ssnmr.2017.08.002. Posted with permission.