Indium polytelluride In2Te5

In2Te5, M=867.64, monoclinic, Cc; a=4.39 (1), b=16.39 (1), c=13.52 (1) A, β=91.65 (5)0, Dsub(m) = 5.95, Dsub(c)= 5.94 g cm-3, U=969.5 A3, Z=4, F(000)= 1432. The structure was solved from Patterson syntheses with Mo Kα X-ray data and refined by block diagonal least squares to R=8% for 1223 structure factors. The material is composed of two sheets of atoms running perpendicular to c*. These are constructed of chains of four-membered In-Te rings; each In is tetrahedrally coordinated indicating that it may be thought of as being sp3 hybridized with an average In-Te bond of 2.832 (6) A, alternating with, and cross-linked, by groups of three Te atoms which on an ionic description are (Te3)2- polyanions. The average Te-Te bond in this anion is 2.837 A with an included angle of 100.1 (2)0. (Auth.)