Mg2RuH4 crystallizes in the orthorhombic Cmcm space group. Mg(1) is bonded in a 4-coordinate geometry to four equivalent H(1) and four equivalent H(2) atoms. Ru(1) is bonded in a 4-coordinate geometry to two equivalent H(1) and two equivalent H(2) atoms. There are two inequivalent H sites. In the first H site, H(1) is bonded to four equivalent Mg(1) and one Ru(1) atom to form a mixture of distorted corner, edge, and face-sharing HMg4Ru square pyramids. In the second H site, H(2) is bonded to four equivalent Mg(1) and one Ru(1) atom to form a mixture of distorted corner, edge, and face-sharing HMg4Ru square pyramids.
Mg2RuH4 crystallizes in the orthorhombic Cmcm space group. Mg(1) is bonded in a 4-coordinate geometry to four equivalent H(1) and four equivalent H(2) atoms. There are a spread of Mg(1)-H(1) bond distances ranging from 2.09-2.42 Å. There are two shorter (2.25 Å) and two longer (2.41 Å) Mg(1)-H(2) bond lengths. Ru(1) is bonded in a 4-coordinate geometry to two equivalent H(1) and two equivalent H(2) atoms. Both Ru(1)-H(1) bond lengths are 1.69 Å. Both Ru(1)-H(2) bond lengths are 1.66 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded to four equivalent Mg(1) and one Ru(1) atom to form a mixture of distorted corner, edge, and face-sharing HMg4Ru square pyramids. In the second H site, H(2) is bonded to four equivalent Mg(1) and one Ru(1) atom to form a mixture of distorted corner, edge, and face-sharing HMg4Ru square pyramids.