ThOn coordination polyhedra in crystal structures

The environments of 107 Th(IV) atoms in 93 oxygen-containing compounds were studied using Voronoi-Dirichlet (VD) polyhedra. At high coordination numbe rs of thorium atoms (CN greater than or equal to 6) the volume of their VD polyhedra is almost independent of CNTh and comprises nearly 11.9(4) Angstr om(3). In classical coordination polyhedra ThOn, ZrOn, and (UOn)-O-IV the l inear dependence of their volume on CN is observed. At CN < 6 the volume of VD polyhedron always exceeds the volume of the corresponding classical coo rdination polyhedron; and the volume of VD polyhedra of metal A in complexe s AO(n) at CNA < 6 increases.