| सारांश: | The reactivity of two paramagnetic nickel(I) compounds, CpNi(NHC) (where Cp = cyclopentadienyl; NHC = 1,3-bis(2,4,6-trimethylphenyl)-imidazol-2-ylidene (IMes) or 1,3-bis(2,6-diisopropylphenyl)-imidazol-2-ylidene (IPr)), towards [Na(dioxane)x][PnCO] (Pn = P, As) is described. These reactions afford symmetric bimetallic compounds (µ2:η2,η2-Pn2){Ni(NHC)(CO)}2. Several novel intermediates en route to such species are identified and characterised, including a compound containing the PCO- anion in an unprecedented µ2:η2,η2-binding mode. Ultimately, on treatment of the (µ2:η2,η2-Pn2){Ni(NHC)(CO)}2 compounds with carbon monoxide the Pn2 units can be released, affording P4 in the case of the phosphorus-containing species, and elemental arsenic in the case of (µ2:η2,η2-As2){Ni(IMes)(CO)}2.
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