Direct observation of 17O-185/187Re 1J-coupling in perrhenates by solid-state 17O VT MAS NMR: Temperature and self-decoupling effects

► Low-temperature solid-state 17O MAS NMR spectra of KReO4 and NH4ReO4. ► Theory, spectral simulations, resolution of 1J(17O-187Re) spin-spin couplings in solids. ► T1(187Re) and T2(17O) relaxation times. ► Dynamics and self-decoupling. ► Correlations of reduced indirect spin-spin couplings 1K(17O-M) with the atomic number of M.