image – A low-dimensional arrangement of [Pb9]4− clusters in [K(18-crown-6)]2K2Pb9 · (en)1.5

Compound [K(18-crown-6)]2K2Pb9 (en)1.5 (1) was crystallized from the reaction mixture that resulted from adding of an ethylenediamine (en) solution of GeI2/K to an en solution of K4Pb9. The vice versa addition of an en solution of K4Pb9 to an en solution of GeI2/K only lead to the decomposition of the cluster. The single crystal X-ray structure determination shows that compound 1 contains a two-dimensional arrangement View the MathML source[K4Pb9]∞2 of lead Zintl ions. The layers, which have the same composition as the starting material Zintl-Phase K4Pb9, are separated by 18-crown-6 molecules.