Synthesis, Molecular Structure, and Dynamic Behaviour in Solution of Octakis(t-butyl isocyanide)dicobalt

DOI: 10.1039/DT9800000080

Source and publish data:

Journal of the Chemical Society, Dalton Transactions p. 80 - 86 (1980)

Update date:2022-08-05

Topics:

Authors:

Carroll, Eamon W.

Green, Michael

Galas, Anita M. R.

Murray, Martin

Turney, Terence W.

et al. et al.

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Article abstract of DOI:10.1039/DT9800000080

Reduction of with potassium amalgam in tetrahydrofuran affords red air-sensitive crystals of octakis(t-butyl isocyanide)dicobalt.Crystals of are orthorhombic, space group P2₁2₁2, with two molecules in a cell of dimensions a=18.017(4), b=12.149(4), and c=11.382(5) Angstroem.The structure has been solved by conventional techniques and refined by least squares to R 0.085 for 2 376 reflection intensities recorded on a four-circle diffractometer.The molecular geometry resembles that of , but is substantially distorted, especially with respect to one of the basal isocyanide functions.Non-bonded contacts calculated for an idealized molecular geometry strongly suggest the importance of intermolecular contacts in the adopted distortions.The cobalt-cobalt distance is 2.4567(20) Angstroem.The 13C n.m.r. spectrum of an enriched (10percent) sample of shows one resonance at ambient temperature collapsing (coalescence temperature -60 deg C) to three resonances (1:1:2) at -90 deg C.Evidence is presented for an intramolecular exchange process.Reaction of with CO, NO, and diphenylacetylene affords respectively , , and 2-PhC2Ph)>(CNBu-t)6>.