Our undergraduate researchers use routine heteronuclear NMR (31P and 11B) involving both diamagnetic and paramagnetic samples and with variable temperature measurements. Heteronuclear NMR allows rapid screening of reaction mixtures by focusing on pivotal heteroatoms to determine extent of conversion of starting material(s) to product(s). Specifically, boron based scorpionate-metal complexes in our lab are easily studied by our students using 11B NMR, in protio- and deuterated solvents. Student measurements have also demonstrated the sensitivity of boron chemical shifts to metal coordination spheres in paramagnetic nickel(II)-scorpionates. 31P NMR has been essential for characterizing metal-phosphines during elution in column chromatography and variable temperature exchange equilibria. Our research students also record routine 13C NMR of heterogeneous resin-supported products, samples beyond ordinary undergraduate training and requiring some skill and care in preparation. Importantly, these myriad experiences enhance NMR training students earn from regular coursework, broadening their problem-solving skills that employ this essential experimental tool.

NMR beyond ordinary undergraduate experiences: Routine measurements with heteronuclear, heterogeneous, and paramagnetic samples

241st National Meeting (2011)

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