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An increasing number of development and applications is also observed in the emerging and fast-growing area of benchtop NMR, which was not covered in this article. Compact instruments provide access to previously inaccessible samples. This is the case for profiling application, which in principle are possible also at high field, but in practice are precluded by cost and availability reasons. This is also true for monitoring applications, which can now be implemented in the fume hood, on in industrial plants. Flow NMR at low and high field also significantly broaden the scope or reactions and processes that can be analysed. Finally, conformer 16 exhibited needle-shaped crystals in cryo-TEM, but tubular bundles and isolated tubes were also found in very small amounts. This indicated the dominance of crystallisation over supramolecular aggregation for dye 16, which was in accordance with its observed fast precipitation. To investigate the properties of this system further, picric acid was applied as a proton source, to remove the anion from the oligomer after protonation. This was intended to lead to longer chains, which was confirmed by lower diffusion coefficients in the DOSY experiment. Furthermore, the diffusion coefficient of the picrate anion was higher than in free solution, which suggested a loose attachment to the oligomer. Jean-Nicolas Dumez is a CNRS researcher (Centre National de la Recherche Scientifique) currently working at Nantes Université. He received his PhD in 2011 from Ecole Normale Supérieure de Lyon, and carried out post-doctoral research at the Weizmann Institute of Science and Southampton University, before moving in 2014 to Université Paris-Saclay as a CNRS researcher, then to Nantes in 2018. His research interests include the development of methods for the analysis of mixtures, NMR pulse sequences, and spin dynamics.

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