We investigated the local hydride environment in the three BTOD samples using state-of-the-art static solid-state NMR methods. Static solid-state NMR experiments allow the determination of the tensor parameters of the interactions affecting the nuclear spin transitions. In the present case the relevant interactions are the shift and the quadrupole interactions. The shift interaction provides information about the chemical environment, bonding geometry and delocalisation/polarization of the spin density via the hyperfine interaction, whereas the quadrupole interaction is very sensitive to the local lattice and coordination geometry and dynamics on the µs-ms time scale. The recently reported 2D adiabatic shifting d-echo experiment can separate and correlate the two interactions as shown in Fig. , which allows a very accurate evaluation of the tensor parameters. The projections onto each axis of the 2D spectrum give information about the two interaction tensors, while the 2D lineshape provides the Euler angles relating the orientation of the two tensors.