Eu(BH4)2 crystallizes in the monoclinic P2_1/c space group. Eu(1) is bonded in a 11-coordinate geometry to one H(2), one H(3), one H(4), one H(6), one H(7), two equivalent H(1), two equivalent H(5), and two equivalent H(8) atoms. There are two inequivalent B sites. In the first B site, B(1) is bonded in a tetrahedral geometry to one H(1), one H(2), one H(3), and one H(4) atom. In the second B site, B(2) is bonded in a tetrahedral geometry to one H(5), one H(6), one H(7), and one H(8) atom. There are eight inequivalent H sites. In the first H site, H(6) is bonded in a single-bond geometry to one Eu(1) and one B(2) atom. In the second H site, H(7) is bonded in a distorted single-bond geometry to one Eu(1) and one B(2) atom. In the third H site, H(8) is bonded in a single-bond geometry to two equivalent Eu(1) and one B(2) atom. In the fourth H site, H(1) is bonded in a distorted single-bond geometry to two equivalent Eu(1) and one B(1) atom. In the fifth H site, H(2) is bonded in a distorted single-bond geometry to one Eu(1) and one B(1) atom. In the sixth H site, H(3) is bonded in a distorted single-bond geometry to one Eu(1) and one B(1) atom. In the seventh H site, H(4) is bonded in a distorted single-bond geometry to one Eu(1) and one B(1) atom. In the eighth H site, H(5) is bonded in a single-bond geometry to two equivalent Eu(1) and one B(2) atom.
Eu(BH4)2 crystallizes in the monoclinic P2_1/c space group. Eu(1) is bonded in a 11-coordinate geometry to one H(2), one H(3), one H(4), one H(6), one H(7), two equivalent H(1), two equivalent H(5), and two equivalent H(8) atoms. The Eu(1)-H(2) bond length is 2.52 Å. The Eu(1)-H(3) bond length is 2.49 Å. The Eu(1)-H(4) bond length is 2.47 Å. The Eu(1)-H(6) bond length is 2.58 Å. The Eu(1)-H(7) bond length is 2.49 Å. There is one shorter (2.49 Å) and one longer (2.56 Å) Eu(1)-H(1) bond length. There is one shorter (2.55 Å) and one longer (2.56 Å) Eu(1)-H(5) bond length. There is one shorter (2.61 Å) and one longer (2.82 Å) Eu(1)-H(8) bond length. There are two inequivalent B sites. In the first B site, B(1) is bonded in a tetrahedral geometry to one H(1), one H(2), one H(3), and one H(4) atom. The B(1)-H(1) bond length is 1.24 Å. The B(1)-H(2) bond length is 1.23 Å. The B(1)-H(3) bond length is 1.23 Å. The B(1)-H(4) bond length is 1.22 Å. In the second B site, B(2) is bonded in a tetrahedral geometry to one H(5), one H(6), one H(7), and one H(8) atom. The B(2)-H(5) bond length is 1.24 Å. The B(2)-H(6) bond length is 1.22 Å. The B(2)-H(7) bond length is 1.22 Å. The B(2)-H(8) bond length is 1.23 Å. There are eight inequivalent H sites. In the first H site, H(6) is bonded in a single-bond geometry to one Eu(1) and one B(2) atom. In the second H site, H(7) is bonded in a distorted single-bond geometry to one Eu(1) and one B(2) atom. In the third H site, H(8) is bonded in a single-bond geometry to two equivalent Eu(1) and one B(2) atom. In the fourth H site, H(1) is bonded in a distorted single-bond geometry to two equivalent Eu(1) and one B(1) atom. In the fifth H site, H(2) is bonded in a distorted single-bond geometry to one Eu(1) and one B(1) atom. In the sixth H site, H(3) is bonded in a distorted single-bond geometry to one Eu(1) and one B(1) atom. In the seventh H site, H(4) is bonded in a distorted single-bond geometry to one Eu(1) and one B(1) atom. In the eighth H site, H(5) is bonded in a single-bond geometry to two equivalent Eu(1) and one B(2) atom.