EuRuB4 crystallizes in the orthorhombic Pbam space group. Eu(1) is bonded in a 18-coordinate geometry to four equivalent Ru(1), two equivalent B(3), four equivalent B(1), four equivalent B(2), and four equivalent B(4) atoms. Ru(1) is bonded in a 15-coordinate geometry to four equivalent Eu(1), one Ru(1), two equivalent B(1), two equivalent B(2), two equivalent B(4), and four equivalent B(3) atoms. There are four inequivalent B sites. In the first B site, B(1) is bonded in a 9-coordinate geometry to four equivalent Eu(1), two equivalent Ru(1), one B(2), and two equivalent B(4) atoms. In the second B site, B(2) is bonded in a 9-coordinate geometry to four equivalent Eu(1), two equivalent Ru(1), one B(1), one B(2), and one B(3) atom. In the third B site, B(3) is bonded in a 9-coordinate geometry to two equivalent Eu(1), four equivalent Ru(1), one B(2), one B(3), and one B(4) atom. In the fourth B site, B(4) is bonded in a 9-coordinate geometry to four equivalent Eu(1), two equivalent Ru(1), one B(3), and two equivalent B(1) atoms.
EuRuB4 crystallizes in the orthorhombic Pbam space group. Eu(1) is bonded in a 18-coordinate geometry to four equivalent Ru(1), two equivalent B(3), four equivalent B(1), four equivalent B(2), and four equivalent B(4) atoms. There are a spread of Eu(1)-Ru(1) bond distances ranging from 3.05-3.15 Å. Both Eu(1)-B(3) bond lengths are 2.68 Å. There are two shorter (2.77 Å) and two longer (2.80 Å) Eu(1)-B(1) bond lengths. All Eu(1)-B(2) bond lengths are 2.78 Å. There are two shorter (2.74 Å) and two longer (2.80 Å) Eu(1)-B(4) bond lengths. Ru(1) is bonded in a 15-coordinate geometry to four equivalent Eu(1), one Ru(1), two equivalent B(1), two equivalent B(2), two equivalent B(4), and four equivalent B(3) atoms. The Ru(1)-Ru(1) bond length is 2.64 Å. Both Ru(1)-B(1) bond lengths are 2.30 Å. Both Ru(1)-B(2) bond lengths are 2.36 Å. Both Ru(1)-B(4) bond lengths are 2.36 Å. All Ru(1)-B(3) bond lengths are 2.39 Å. There are four inequivalent B sites. In the first B site, B(1) is bonded in a 9-coordinate geometry to four equivalent Eu(1), two equivalent Ru(1), one B(2), and two equivalent B(4) atoms. The B(1)-B(2) bond length is 1.85 Å. There is one shorter (1.86 Å) and one longer (1.87 Å) B(1)-B(4) bond length. In the second B site, B(2) is bonded in a 9-coordinate geometry to four equivalent Eu(1), two equivalent Ru(1), one B(1), one B(2), and one B(3) atom. The B(2)-B(2) bond length is 1.82 Å. The B(2)-B(3) bond length is 1.76 Å. In the third B site, B(3) is bonded in a 9-coordinate geometry to two equivalent Eu(1), four equivalent Ru(1), one B(2), one B(3), and one B(4) atom. The B(3)-B(3) bond length is 1.73 Å. The B(3)-B(4) bond length is 1.77 Å. In the fourth B site, B(4) is bonded in a 9-coordinate geometry to four equivalent Eu(1), two equivalent Ru(1), one B(3), and two equivalent B(1) atoms.