Triethynylphosphine oxide

In the solid state, the title compound, C6H3OP, lies on a crystallographic mirror plane, with the P=O as well as one of the acetylene units bisected by this plane. The central P atom exhibits pseudo-tetrahedral geometry. The crystallographic packing is dominated by C-H center dot center dot center dot O hydrogen bonds between all of the acetylene H atoms and the O atom, which form a heavily interconnected hydrogen-bonding network. Two of the hydrogen bonds, related by the mirror plane, are coplanar with each other and with the P=O unit, while the third C=H center dot center dot center dot O hydrogen bond is at an angle of 67.49 (7)degrees to this plane; the H center dot center dot center dot P=O angles are 134 and 112 degrees, respectively. The three-dimensional structure formed by the hydrogen-bond interactions consists of two independent interpenetrating networks.