RuAsSe crystallizes in the monoclinic P2_1/c space group. Ru(1) is bonded to three equivalent As(1) and three equivalent Se(1) atoms to form distorted RuAs3Se3 octahedra that share corners with eight equivalent Ru(1)As3Se3 octahedra, corners with three equivalent As(1)Ru3Se tetrahedra, corners with three equivalent Se(1)AsRu3 tetrahedra, and edges with two equivalent Ru(1)As3Se3 octahedra. The corner-sharing octahedral tilt angles range from 54-60°. As(1) is bonded to three equivalent Ru(1) and one Se(1) atom to form distorted AsRu3Se tetrahedra that share corners with three equivalent Ru(1)As3Se3 octahedra, corners with four equivalent As(1)Ru3Se tetrahedra, corners with nine equivalent Se(1)AsRu3 tetrahedra, and  an edgeedge with one As(1)Ru3Se tetrahedra. The corner-sharing octahedral tilt angles range from 66-72°. Se(1) is bonded to three equivalent Ru(1) and one As(1) atom to form SeAsRu3 tetrahedra that share corners with three equivalent Ru(1)As3Se3 octahedra, corners with four equivalent Se(1)AsRu3 tetrahedra, corners with nine equivalent As(1)Ru3Se tetrahedra, and  an edgeedge with one Se(1)AsRu3 tetrahedra. The corner-sharing octahedral tilt angles range from 75-79°.
RuAsSe crystallizes in the monoclinic P2_1/c space group. Ru(1) is bonded to three equivalent As(1) and three equivalent Se(1) atoms to form distorted RuAs3Se3 octahedra that share corners with eight equivalent Ru(1)As3Se3 octahedra, corners with three equivalent As(1)Ru3Se tetrahedra, corners with three equivalent Se(1)AsRu3 tetrahedra, and edges with two equivalent Ru(1)As3Se3 octahedra. The corner-sharing octahedral tilt angles range from 54-60°. There are a spread of Ru(1)-As(1) bond distances ranging from 2.49-2.51 Å. There are a spread of Ru(1)-Se(1) bond distances ranging from 2.43-2.45 Å. As(1) is bonded to three equivalent Ru(1) and one Se(1) atom to form distorted AsRu3Se tetrahedra that share corners with three equivalent Ru(1)As3Se3 octahedra, corners with four equivalent As(1)Ru3Se tetrahedra, corners with nine equivalent Se(1)AsRu3 tetrahedra, and  an edgeedge with one As(1)Ru3Se tetrahedra. The corner-sharing octahedral tilt angles range from 66-72°. The As(1)-Se(1) bond length is 2.53 Å. Se(1) is bonded to three equivalent Ru(1) and one As(1) atom to form SeAsRu3 tetrahedra that share corners with three equivalent Ru(1)As3Se3 octahedra, corners with four equivalent Se(1)AsRu3 tetrahedra, corners with nine equivalent As(1)Ru3Se tetrahedra, and  an edgeedge with one Se(1)AsRu3 tetrahedra. The corner-sharing octahedral tilt angles range from 75-79°.