[{"from": "human", "value": "Use the given information to create a molecule that fulfills the desired purpose. The molecule appears as yellow to green to bluish-black, iridescent crystals. Sublimes with decomposition at 2700 \u00b0C. Density 3.21 g cm-3. Insoluble in water. Soluble in molten alkalis (NaOH, KOH) and molten iron."}, {"from": "gpt", "value": "[C-1][#Si+1]"}]