Keywords: Nonaplumbide-anion-from-xtal-3D-vdW.png Space-filling model of the nonaplumbide anion Pb<sub>9</sub><sup>4 </sup> as found in the crystal structure of K 18-crown-6 <sub>2</sub>K<sub>2</sub>Pb<sub>9</sub>ยท en <sub>1 5</sub> X-ray crystallographic data from http //dx doi org/10 1016/j ica 2006 04 017 Inorg Chem 2006 359 4774-4778 Model constructed in http //www crystalmaker com/ CrystalMaker 8 1 Image generated in http //accelrys com/products/discovery-studio/visualization/discovery-studio-visualizer html Accelrys DS Visualizer own 2008-03-09 Ben Mills Benjah-bmm27 Images by Ben Mills Plumbides Anions |