RuAs2 is zeta iron carbide structured and crystallizes in the orthorhombic Pnnm space group. Ru(1) is bonded to six equivalent As(1) atoms to form distorted RuAs6 octahedra that share corners with eight equivalent Ru(1)As6 octahedra, corners with six equivalent As(1)AsRu3 tetrahedra, and edges with two equivalent Ru(1)As6 octahedra. The corner-sharing octahedral tilt angles are 54°. As(1) is bonded to three equivalent Ru(1) and one As(1) atom to form distorted AsAsRu3 tetrahedra that share corners with three equivalent Ru(1)As6 octahedra, corners with thirteen equivalent As(1)AsRu3 tetrahedra, and  an edgeedge with one As(1)AsRu3 tetrahedra. The corner-sharing octahedral tilt angles range from 70-72°.
RuAs2 is zeta iron carbide structured and crystallizes in the orthorhombic Pnnm space group. Ru(1) is bonded to six equivalent As(1) atoms to form distorted RuAs6 octahedra that share corners with eight equivalent Ru(1)As6 octahedra, corners with six equivalent As(1)AsRu3 tetrahedra, and edges with two equivalent Ru(1)As6 octahedra. The corner-sharing octahedral tilt angles are 54°. There are two shorter (2.46 Å) and four longer (2.48 Å) Ru(1)-As(1) bond lengths. As(1) is bonded to three equivalent Ru(1) and one As(1) atom to form distorted AsAsRu3 tetrahedra that share corners with three equivalent Ru(1)As6 octahedra, corners with thirteen equivalent As(1)AsRu3 tetrahedra, and  an edgeedge with one As(1)AsRu3 tetrahedra. The corner-sharing octahedral tilt angles range from 70-72°. The As(1)-As(1) bond length is 2.49 Å.