Eu2(PO3H)3

The structure of dieuropium tris(hydrogen phosphite), Eu 2 (PO 3 H) 3 , contains three independent phosphite anions. One Eu 3+ cation is eight-coordinate whereas the other is only seven-coordinate. One [EuO 8 ] dodecahedron and one monocapped [EuO 7 ] trigonal prism alternate so that, by sharing one vertex, infinite layers are formed parallel to the [101] direction. The layers are held together by Eu-O interlayer bonds