Reactions of the protonated heptaphosphide dianion, [HP7]2−, with one equivalent of E[N(SiMe3)2]2(E = Ge, Sn, Pb) give rise to novel derivatized cluster anions [P7EN(SiMe3)2]2−(E = Ge (1), Sn (2) and Pb (3)).1readily decomposes in solution at room temperature to afford the dimeric product [(P7Ge)2N(SiMe3)2]3−(4).