Plumbide

One salt that can be formed this way is when cryptand reacts with sodium and lead in ethylenediamine (en) to produce [Na(crypt)]+2[Pb5]2−, which is red in solution.

Lead can also form the [Pb9]4− anion, which is emerald green in solution.

The lead atom has a coordination number of 12 in the crystal structure of this compound.

It is bound to four rhodiums, six ceriums, and two other lead atoms in the crystal structure of the chemical.

This is not a simple Zintl compound, but rather contains the organic molecules 18-crown-6 and ethylenediamine (en) in order to stabilize the crystal structure.