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Transition-metal oxyhydrides are of considerable current interest due to the unique features of the hydride anion, most notably the absence of valence  p  orbitals. This feature distinguishes hydrides from all other anions, and gives rise to unprecedented properties in this new class of materials. Here we show via a high-pressure study of anion-ordered strontium vanadium oxyhydride SrVO 2 H that H −  is extraordinarily compressible, and that pressure drives a transition from a Mott insulator to a metal at ~ 50 GPa. Density functional theory suggests that the band gap in the insulating state is reduced by pressure as a result of increased dispersion in the  ab -plane due to enhanced V dπ -O pπ -V dπ  overlap. Remarkably, dispersion along  c  is limited by the orthogonal V dπ -H 1s -V dπ  arrangement despite the greater  c -axis compressibility, suggesting that the hydride anions act as π-blockers. The wider family of oxyhydrides may therefore give access to dimensionally reduced structures with novel electronic properties.

The role of π-blocking hydride ligands in a pressure-induced insulator-to-metal phase transition in SrVO2H