Synthesis of arsenic-rich Asn ligand complexes from yellow arsenic

Abstract

The reaction of [{η⁵-Cp′′′Co}₂{μ,η^4:4-toluene}] with yellow arsenic yields the arsenic-rich As_n ligand complexes [{Cp′′′Co(μ,η^2:2-As₂)}₂] (1), [(Cp′′′Co)₄(μ₄,η^4:4:2:2:1:1-As₁₀)] (2) and [(Cp′′′Co)₃(μ₃,η^4:4:2:1-As₁₂)] (3), which were comprehensively characterized. The molecular structure of 1 show a triple-decker complex with two As₂ units forming the middle-deck; compound 2 contains an all-arsenic As₁₀ analogue of dihydrofulvalene in the molecular structure. The As₁₂ ligand in 3 represents the largest As_n ligand complex reported so far.