U2Fe3Si5 is delta Molybdenum Boride-derived structured and crystallizes in the monoclinic C2/c space group. U(1) is bonded in a 16-coordinate geometry to two equivalent Fe(2), four equivalent Fe(1), two equivalent Si(2), two equivalent Si(3), two equivalent Si(4), and four equivalent Si(1) atoms. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 7-coordinate geometry to four equivalent U(1), one Si(1), one Si(2), one Si(4), and two equivalent Si(3) atoms. In the second Fe site, Fe(2) is bonded in a 6-coordinate geometry to four equivalent U(1), one Si(2), one Si(4), and four equivalent Si(1) atoms. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to four equivalent U(1), one Fe(1), two equivalent Fe(2), one Si(2), and one Si(4) atom. In the second Si site, Si(2) is bonded in a 11-coordinate geometry to four equivalent U(1), one Fe(2), two equivalent Fe(1), two equivalent Si(1), and two equivalent Si(4) atoms. In the third Si site, Si(3) is bonded in a 10-coordinate geometry to four equivalent U(1), four equivalent Fe(1), and two equivalent Si(3) atoms. In the fourth Si site, Si(4) is bonded in a 11-coordinate geometry to four equivalent U(1), one Fe(2), two equivalent Fe(1), two equivalent Si(1), and two equivalent Si(2) atoms.
U2Fe3Si5 is delta Molybdenum Boride-derived structured and crystallizes in the monoclinic C2/c space group. U(1) is bonded in a 16-coordinate geometry to two equivalent Fe(2), four equivalent Fe(1), two equivalent Si(2), two equivalent Si(3), two equivalent Si(4), and four equivalent Si(1) atoms. There is one shorter (3.29 Å) and one longer (3.33 Å) U(1)-Fe(2) bond length. There are a spread of U(1)-Fe(1) bond distances ranging from 2.79-3.19 Å. There is one shorter (2.99 Å) and one longer (3.11 Å) U(1)-Si(2) bond length. There is one shorter (2.95 Å) and one longer (3.10 Å) U(1)-Si(3) bond length. There is one shorter (3.02 Å) and one longer (3.08 Å) U(1)-Si(4) bond length. There are a spread of U(1)-Si(1) bond distances ranging from 2.87-3.08 Å. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 7-coordinate geometry to four equivalent U(1), one Si(1), one Si(2), one Si(4), and two equivalent Si(3) atoms. The Fe(1)-Si(1) bond length is 2.28 Å. The Fe(1)-Si(2) bond length is 2.28 Å. The Fe(1)-Si(4) bond length is 2.40 Å. There is one shorter (2.35 Å) and one longer (2.39 Å) Fe(1)-Si(3) bond length. In the second Fe site, Fe(2) is bonded in a 6-coordinate geometry to four equivalent U(1), one Si(2), one Si(4), and four equivalent Si(1) atoms. The Fe(2)-Si(2) bond length is 2.36 Å. The Fe(2)-Si(4) bond length is 2.55 Å. There are two shorter (2.32 Å) and two longer (2.36 Å) Fe(2)-Si(1) bond lengths. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to four equivalent U(1), one Fe(1), two equivalent Fe(2), one Si(2), and one Si(4) atom. The Si(1)-Si(2) bond length is 2.45 Å. The Si(1)-Si(4) bond length is 2.51 Å. In the second Si site, Si(2) is bonded in a 11-coordinate geometry to four equivalent U(1), one Fe(2), two equivalent Fe(1), two equivalent Si(1), and two equivalent Si(4) atoms. Both Si(2)-Si(4) bond lengths are 2.74 Å. In the third Si site, Si(3) is bonded in a 10-coordinate geometry to four equivalent U(1), four equivalent Fe(1), and two equivalent Si(3) atoms. Both Si(3)-Si(3) bond lengths are 2.75 Å. In the fourth Si site, Si(4) is bonded in a 11-coordinate geometry to four equivalent U(1), one Fe(2), two equivalent Fe(1), two equivalent Si(1), and two equivalent Si(2) atoms.