The Azide Homologues EtPPP and PhAsAsAs as Bifacially Coordinated Ligands in Tripod‐Cobalt Complexes: Synthesis, Structure and Molecular Dynamics

What should they be called, the higher homologues of azides: phosphides and arsides? Hardly, and even the 1990 recommendations of the Inorganic IUPAC rules do not help very much further. Research is often one step ahead of nomenclatural canonization, as is demonstrated by the synthesis of the PhAs3 complex cation 1 and an EtP3 analogue. 1 is formed upon reaction of Co(BF4)2 · 6H2O with PhAsH2 in the presence of H3CC(CH2PPh2)3 (= L) and can be isolated as the BF salt (blackish-green crystals).