Assign the point groups: a. The core of the iron(III) cluster 4py (sao = salicylald...

Assign the point groups:

a. The core of the iron(III) cluster 4py (sao = salicylaldoxime; py = pyridine), which has an Fe₄O₄ cubane structure inside an Fe₄ tetrahedron. (See I. A. Gass, C. J. Milios, A. G. Whittaker, F. P. A. Fabiani, S. Parsons, M. Murrie, S. P. Perlepes, E. K. Brechin, Inorg. Chem., 2006, 45, 5281.)

b. The [As @ Ni₁₂ , As₂₀]^3- ion, which contains an As atom at the center of a Ni₁₂ icosahedron, which in turn is surrounded by an As₂₀ dodecahedron. (See B. W. Eichhorn, Science, 2003, 300, 778.)