Solid state magic angle spinning NMR allows detection of low abundance 43 Ca with spin of 7/2. The coordination chemistry of Calcium is complex with a number of 7- and 9-coordinate complexes known.
Has anyone found evidence of Fluorine coupling to the Calcium in published spectra?
I would guess that observation of the 19F spectrum could lose any 43Ca splitting peaks in the baseline noise.
CaF2 is an insoluble solid, therefore you require solid state NMR to see any coupling.
43Ca has a low natural abundance (0.135 %), so you would need to enrich before you have any chance of seeing this. Likewise, any defects or site substitution will cause broadening of the 19F resonance, obscuring the satellites. ( J. Phys. Chem. Lett. 2010, 1, 1126–1129 )
Therefore, without significant enrichment (at a great cost) and a highly pure sample then I am not sure that this is possible.
Thanks very much Gregory.
After posting the question, I realized Fluorite is a better search term and found this figure with the caption: 43Ca MAS NMR spectra of the mixed fluoride crystals; (a) pure CaF2, (b) Ca0.74Sr0.26F2, (c) Ca0.44Sr0.56F2, (d) Ca0.24Sr0.76F2, (e) Ca0.13Sr0.87F2, and (f) Ca0.05Sr0.95F2. Spinning sidebands are denoted with asterisks. Article Multinuclear NMR studies of mixed Ca1−xSrxF2 crystals
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