Pnictide-Capped Butterfly Cluster in the Crystal Structure of Nb 4 PnX 11 ( Pn = N, P; X = Cl, Br, I).

Niobium pnictide halides Nb 4 PnX 11 ( Pn = N, P; X = Cl, Br, I) are reported with their average crystal structures. Individual pnictide-capped butterfly cluster cores [Nb 4 P] in the structure are interconnected into two-dimensional layers, with their electronic and magnetic properties being analyzed.