Sn4.4Mo24O38

The single-crystal structure of tetratin tetracosamolybdenum octatriacontao xide, Sn4.4Mo24O38 contains infinite chains of centrosymmetric dioctahedral Mole and centrosymmetric trioctahedral Mo-14 clusters. These clusters, as well as the O atoms, the arrangement of which derives from a closest-packin g with the layer sequence...ABAC..., form sheets parallel to the ac plane o f the monoclinic unit cell. The Mo-Mo distances range from 2.6225 (7) to 2. 8212 (9)Angstrom and from 2.6270(7) to 2.8365(7)Angstrom in the Mole and Mo 14 clusters, respectively. The Mo-O distances vary between 1.949 (4) and 2. 151 (4)A in the Mole cluster and between 1.938(4) and 2.140 (4)Angstrom in the Mo-14, cluster. The three crystallographically independent Sn2+ ions ar e off the centre of distorted oxygen octahedra.