RuP2 is zeta iron carbide structured and crystallizes in the orthorhombic Pnnm space group. Ru(1) is bonded to six equivalent P(1) atoms to form distorted RuP6 octahedra that share corners with eight equivalent Ru(1)P6 octahedra, corners with six equivalent P(1)PRu3 tetrahedra, and edges with two equivalent Ru(1)P6 octahedra. The corner-sharing octahedral tilt angles are 57°. P(1) is bonded to three equivalent Ru(1) and one P(1) atom to form PPRu3 tetrahedra that share corners with three equivalent Ru(1)P6 octahedra, corners with thirteen equivalent P(1)PRu3 tetrahedra, and  an edgeedge with one P(1)PRu3 tetrahedra. The corner-sharing octahedral tilt angles range from 69-71°.
RuP2 is zeta iron carbide structured and crystallizes in the orthorhombic Pnnm space group. Ru(1) is bonded to six equivalent P(1) atoms to form distorted RuP6 octahedra that share corners with eight equivalent Ru(1)P6 octahedra, corners with six equivalent P(1)PRu3 tetrahedra, and edges with two equivalent Ru(1)P6 octahedra. The corner-sharing octahedral tilt angles are 57°. There are two shorter (2.36 Å) and four longer (2.37 Å) Ru(1)-P(1) bond lengths. P(1) is bonded to three equivalent Ru(1) and one P(1) atom to form PPRu3 tetrahedra that share corners with three equivalent Ru(1)P6 octahedra, corners with thirteen equivalent P(1)PRu3 tetrahedra, and  an edgeedge with one P(1)PRu3 tetrahedra. The corner-sharing octahedral tilt angles range from 69-71°. The P(1)-P(1) bond length is 2.23 Å.