t1-noise elimination by continuous chemical shift anisotropy refocusing

Perras, Frédéric A.; Goh, Tian Wei; Huang, Wenyu

doi:10.1016/j.ssnmr.2022.101807

Cited by 4 publications

(6 citation statements)

References 61 publications

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“…A 1 H{ 11 B} dipolar heteronuclear multiple-quantum correlation (D-HMQC) 70 spectrum was acquired using the CSA-free SR6 2 3 recoupling sequence. 42 This spectrum (shown in Figure S12) shows a correlation between the B(B)O 2 11 B NMR signal and 1 H sites resonating at 3.2 ppm, in agreement with their assignment as B−OH protons.…”

Section: Layer Terminationsupporting

confidence: 73%

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The Structure of Boron Monoxide

et al. 2023

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Boron monoxide (BO), prepared by the thermal condensation of tetrahydroxydiboron, was first reported in 1955; however, its structure could not be determined. With the recent attention on boron-based two-dimensional materials, such as borophene and hexagonal boron nitride, there is renewed interest in BO. A large number of stable BO structures have been computationally identified, but none are supported by experiments. The consensus is that the material likely forms a boroxine-based two-dimensional material. Herein, we apply advanced 11B NMR experiments to determine the relative orientations of B(B)O2 centers in BO. We find that the material is composed of D 2h -symmetric O2B–BO2 units that organize to form larger B4O2 rings. Further, powder diffraction experiments additionally reveal that these units organize to form two-dimensional layers with a random stacking pattern. This observation is in agreement with earlier density functional theory (DFT) studies that showed B4O2-based structures to be the most stable.

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Section: Layer Terminationsupporting

confidence: 73%

“…The energy-dispersive X-ray spectroscopy (EDS) mapping data were collected with a Super-X EDS detector. recoupling sequence 42 with a 47.6191 kHz MAS frequency. 11 B pulses utilized an effective rf field of 50 kHz, and hard 1 H pulses had an rf field of 100 kHz.…”

Section: Scanning Transmission Electron Microscopy (Stem)mentioning

confidence: 99%

The Structure of Boron Monoxide

et al. 2023

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“…55 Indirect detection of 89 Y using D-HMQC was recently reported for the metal organic framework phase Y-MOF-76, which compared approaches to refocus CSA effects and reduce t 1 -noise. 57…”

Section: Recent Advances In Solid-state Nmr Methodologymentioning

confidence: 99%

“…55 Indirect detection of 89 Y using D-HMQC was recently reported for the metal organic framework phase Y-MOF-76, which compared approaches to refocus CSA effects and reduce t 1 -noise. 57 To gain even more in signal DNP has recently been combined with indirect detection, which has become possible with the availability of low-temperature fast MAS probes. A detailed theoretical and experimental study with DNP-enhanced 2D indirectly detected HETCOR (idHETCOR) experiments on four spin- 1 2 nuclei ( 13 C, 15 N, 113 Cd, 89 Y), with 1.3 and 3.2 mm probes used.…”

Section: Techniques For Sensitivity Enhancementmentioning

confidence: 99%

“…Their applications to probe inorganic materials problems are illustrated by recent examples taken from the last decade. To be completely comprehensive low-g spin- 1 2 nuclei would also include 57 Fe and 169 Tm. However the magnetic nature of both these isotopes means NMR reports from them are usually from internal field observation or heavily paramagnetically perturbed spectra which are quite different from conventional NMR approaches so are not discussed further here.…”

Section: Introductionmentioning

confidence: 99%

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