Reaction of [Ni10(CO)16C2]2– with four equivalents of PPh3 in tetrahydrofuran quantitatively afforded the novel brown [Ni16(CO)23C4]4– tetra-anion, whose metal frame has been shown by X-ray diffraction studies to consist of a unique hexadecanuclear truncated ν2-octahedron caging two interstitial C2 moieties with a very short interatomic C-C separation of 1.38 Å.
A. Ceriotti, G. Longoni, M. Manassero, N. Masciocchi, G. Piro, L. Resconi and M. Sansoni, J. Chem. Soc., Chem. Commun., 1985, 1402 DOI: 10.1039/C39850001402
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