We attempted the reaction in solution phase with several metal cation precursors, as shown in Table . Here, we take a color change and/or precipitation as evidence that the SeNPs converted to metal selenides. On the basis of the color changes and precipitates observed, it appears that this reaction is general-functioning with Pb, Co, Ce, Cu, Sb, Ag, Cd, and Zn, but not W. Based on initial studies it is clear that if a crystal has more than one favorable structure, the final product will be polycrystalline.