Rhenium-185 and rhenium-187 NMR references

Isotope	Spin	Natural abundance (%)	Quadrupole moment (10^-30m²)	Relative sensitivity	Absolute sensitivity	NMR frequency (MHz) at a field of 2.3488T	Reference sample
Re-185	5/2	37.07	218.0	0.13	4.93E-2	-22.513	KReO₄
Re-187	5/2	62.93	207.0	0.13	8.62E-2	-22.744

C. M. Widdifield, A. D. Bain, and D. L. Bryce
Definitive solid-state ^185/187Re NMR spectral evidence for and analysis of the origin of high-order quadrupole-induced effects for I = 5/2,
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