Synthesis of arsenic-rich Asn ligand complexes from yellow arsenic

摘要

The reaction of [{η⁵-Cp′′′Co}2{μ,η^4:4-toluene}] with yellow arsenic yields the arsenic-rich Asn 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 Asn ligand complex reported so far.