Flavoproteins are essential biomolecules involved in many vital processes. Understanding their reactivity requires study of their intermediate semiquinone form. Using advanced spectroscopy and isotopic labeling, we measured key interactions within this state, uncovering subtle changes in the distribution of electron density. These findings refine our understanding of flavoprotein function and highlight the value of combining experiments and computations for studying complex biological systems.

Parallel NMR (nuclear magnetic resonance) detection enhances measurement throughput for high-throughput screening. However, local gradients in parallel detectors cause field spillover in adjacent channels, leading to spin dephasing and signal loss. This study introduces a compensation scheme using optimized pulses to mitigate gradient-induced field inhomogeneity through coherence locking. The proposed approach offers an effective solution for NMR probes with parallel, independently switchable gradient coils.

Nuclear quadrupole resonance is a sensitive technique for studying local structure. However, materials whose local structure is disordered can produce very wide spectra that are both technically challenging and require a lot of human-hours to measure. We present a set-up that acquires these spectra automatically over a wide frequency range. We demonstrate this set-up on several lead halide perovskites at variable temperatures and discuss the details uncovered by high-resolution spectra.

3D-printed sample cells inserted into standard 5 mm NMR (nuclear magnetic resonance) tubes are demonstrated to offer improved sensitivity for biomolecular NMR spectroscopy when the quantity of material is limiting. Using an ellipsoidal shape, magnetic field homogeneity inside the microcell to the first order is insensitive to differences in the magnetic susceptibility of the printer resin and solvent. The sample cells are particularly useful at high ionic strength and at ultrahigh magnetic fields.

A protein is produced where a single amino acid type is substituted globally by a fluorinated analogue. Through-space fluorine–fluorine contacts are observed by ¹⁹F NMR (nuclear magnetic resonance) spectroscopy. Substitution of methyl groups by CH₂F groups yields outstanding spectral resolution with minimal structural perturbation of the protein. Our work identifies the γ-gauche effect as the main reason for the spectral dispersion.

Local dynamics in rotating solids can be investigated by measuring enhanced transverse relaxation rates near rotary resonance conditions. In contrast, this effect is not expected in rotating solutions, as first-order anisotropic interactions are averaged out. For rotating solutions, we show how a decrease in the spin-lock signal near rotary resonance reports fluctuations that are introduced due to imperfect hardware, with rf-field imperfections being the primary source of the effect.

We have performed a low-frequency electron paramagnetic resonance (EPR) study on two (LiNi_0.8Mn_0.1Co_0.1O₂ (NMC)-Li-metal- and NMC-Si-based) solid-state batteries sealed inside an industrial and standard aluminum laminated pouch cell. We observed an EPR spectrum from Li metal, confirming the good penetration of the microwave field through the pouch. We think our approach provides valuable insight for the battery community, paving the way for the quality control of industrial and commercial batteries.