Exploring the structure of type V deep eutectic solvents by xenon NMR spectroscopy.

Hydrophobic non-ionic (type V) deep eutectic solvents (DESs) have recently emerged as a new class of sustainable materials that have shown unique properties in several applications. In this study, type V DESs thymol : camphor, menthol : thymol and eutectic mixtures (EMs) based on menthol : carboxylic acids with variable chain length, are experimentally investigated using xenon NMR spectroscopy, with the aim to clarify the peculiar nanostructure of these materials. The results, obtained from the analysis of the Xe chemical shifts and of the longitudinal relaxation times, reveal a correlation between the deviation from ideality of the DESs and their structure free volume.

Porosity of Molecularly Imprinted Polymers Investigated by Xe NMR Spectroscopy.

Molecularly imprinted polymers (MIPs) display intriguing recognition properties and can be used as sensor recognition elements or in separation. In this work, we investigated the formation of hierarchical porosity of compositionally varied MIPs using Xe Nuclear Magnetic Resonance (NMR) and H Time Domain Nuclear Magnetic Resonance (TD-NMR). Variable temperature Xe NMR established the morphological variation with respect to the degree of cross-linking, supported by H TD-NMR determination of polymer chain mobility.