[As3M(As3Pb3)]3− (M = Nb, Ta): Ternary Heterometallic Clusters with Early Transition Metal Atoms and Aromatic [Pb3]2−

Two ternary clusters, [As3Nb(As3Pb3)]3− 1 and [As3Ta(As3Pb3)]3− 2, were directly extracted from “K8NbPbAs5” and “K8TaPbAs5” intermetallic solid in the presence of ethylenediamine and 2.2.2-crypt, respectively. Both 1 and 2, comprising an electron-poor early transition metal-atom Nb or Ta coordinated