NMR Methods / Theory

  • Catch me if you can – new stopped-flow NMR methods

    Ran Wei@RanWei_NMR

    A new stopped-flow NMR apparatus was constructed to capture the fleeting information from irreversible chemical reactions at the millisecond timescale. With the aid of this technique, we are able to study short-lived intermediates, and evolving reactions that occur beyond the measurement deadtime of traditional NMR experiments (t1/2 = 45 ms).

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  • Stable MAS NMR at Ultralow Temperatures from 24 – 100 K

    Raj Chaklashiya@RajChaklashiya

    It is the NMR spectroscopist’s dream to perform Magic-Angle Spinning (MAS) NMR at temperatures below 100 K for significant Boltzmann polarization signal gains. Here we demonstrate this using NMR with stable MAS spinning at 24 – 100 K using a novel helium gas recirculation system developed in collaboration with JEOL.

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  • NMR Online – Leave the desktop behind

    Simon P. Skinner@nmronline

    NMR Online is an NMR spectroscopy data analysis platform. It’s NMR community-led, web-based, cloud-driven. Built with leading tech, and a test-driven approach. NMR Online – BETA features a CEST workflow to demonstrate how this analysis can be done in under 10 clicks! Please DM for login information.

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  • Mrsimulator: A Python Package for Fast Solid-State NMR Spectral Simulation

    Matthew D. Giammar@Matth__3w

    Mrsimulator is an open-source and free Python package for fast computation and analysis of NMR spectra compatible with other modern packages like Scikit-learn, Keras, and nmrglue. Mrsimulator offers least-squares fitting of 1D and 2D spectra out-of-the-box and can run in Jupyter Notebooks. Documentation: https://mrsimulator.readthedocs.io/en/latest/

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  • Broadband Cross Polarization to Half-Integer Quadrupolar Nuclei

    James J. Kimball@jimmy_kimball97

    In this work, we present new research on the successful implementation of the Broadband Adiabatic-Inversion Cross Polarization pulse sequence for the acquisition of Ultra-Wideline NMR spectra of half-integer quadrupolar nuclei using low power pulses. Numerical simulations are used to explore underlying mechanisms and are correlated with experimental results.

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  • New Methods targetting Battery Material Characterization

    Isha Yadav@IshaYadav_1809

    Battery is efficient and safer energy storage device . We will use advanced NMR instrumentation and pulse sequence (19 F – 7 Li correlation ) to study solid polymer electrolytes to establish ion conductivity – structural relationship , stability- structural relationship and through DNP we can deal with electrode-electrolyte interface.

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  • Structural characterization by NMR spectroscopy of a DnaX mini-intein derived from Spirulina platensis

    Soumendu Boral@BoralSoumendu

    Inteins perform protein splicing reaction. We solved solution NMR structure (PDB code: 7CFV) of a 136-residue DnaX mini-intein. The NMR structural ensemble has backbone and heavy atom RMSD of 0.27 and 0.52 Å, respectively. NMR-based HX and 15N-relaxation experiments showed the presence of a very stable core and conserved motions.

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  • Novel Sampling Schemes for the Indirect Detection of Ultrawideline 195Pt Solid-State NMR Spectra for the Characterization of Heterogeneous Catalysts

    Benjamin Atterberry@BenjaminAtterb1

    The noble metal platinum is widely utilized in numerous catalytic processes. However, the structure of Pt sites in heterogeneous catalysts are often ill-defined. Herein, we introduce a series of solid-state NMR experiments that use indirect detection of a sensitive spy nucleus (1H or 31P) to rapidly acquire 195Pt NMR spectra.

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  • Investigation of methyl group rotation barriers in halogen bonded cocrystals via 2H NMR using T1 time constants

    Shubha Gunaga@sgshubha_

    We have studied the dynamics of methyl group rotations experimentally as well theoretically in brominated and chlorinated cocrystals of 2,3,5,6-tetramethylpyrazine. Five novel cocrystals were synthesized and characterized via single crystal and X-ray powder diffraction. 2H NMR spin-echo experiments were carried out over the temperature range of 140 K to 320 K.

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  • Quantitative NMR of chloride by an accurate internal standard approach

    Jared Scott Wood@jaredscottwood

    Quantitative analysis of heteroatoms in small molecule active pharmaceutical ingredients is crucial for the development of modern therapeutics. Here we present a robust and generally applicable 35Cl solution qNMR method to assay the level of chloride in pharmaceutical compounds.

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