EuAs3 crystallizes in the monoclinic C2/m space group. Eu(1) is bonded in a 9-coordinate geometry to one As(1) and eight equivalent As(2) atoms. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 4-coordinate geometry to one Eu(1), one As(1), and two equivalent As(2) atoms. In the second As site, As(2) is bonded in a 6-coordinate geometry to four equivalent Eu(1), one As(1), and one As(2) atom.
EuAs3 crystallizes in the monoclinic C2/m space group. Eu(1) is bonded in a 9-coordinate geometry to one As(1) and eight equivalent As(2) atoms. The Eu(1)-As(1) bond length is 3.18 Å. There are a spread of Eu(1)-As(2) bond distances ranging from 3.07-3.44 Å. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 4-coordinate geometry to one Eu(1), one As(1), and two equivalent As(2) atoms. The As(1)-As(1) bond length is 2.49 Å. Both As(1)-As(2) bond lengths are 2.47 Å. In the second As site, As(2) is bonded in a 6-coordinate geometry to four equivalent Eu(1), one As(1), and one As(2) atom. The As(2)-As(2) bond length is 2.48 Å.