Inorganic Chemistry, Vol.37, No.15, 3889-3891, 1998
Deltahedral clusters in neat solids : Synthesis and structure of the Zintl phase Cs4Pb9 with discrete Pb-9(4-) clusters
Isolated clusters of Pb-9(4-) with the shape of monocapped square antiprisms are found in Cs4Pb9 made by direct fusion of the elements. A "close-packed" layer of clusters viewed along c of the monoclinic cell is shown to the right (b is vertical).