Sample Preparation
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Sample Preparation Subtopics
Introduction to NMR Sampling
we need a homogeneous magnetic field – locking and shimming the magnet – why we need a deuterated solvent – NMR tubes (survey of common types including Shigemi tubes)
Sample Preparation
magnetic susceptibility overview – effect of solvent height, heterogeneous solutions, paramagnetic impurities, and NMR tube on the spectrum – rules for preparing good sample (i.e., the correct amount of solvent, a homogeneous solution, no paramagnetic impurities, etc.) – proper care of NMR tubes – notes regarding solvents
Sample concentration
practical issues (low vs high concentration, typical concentration range) – example spectra (illustrating effects of concentration and signal averaging – concentration recommendations – estimating time or concentration required – how to quickly estimate the concentration of your sample