Polycarbide nickel clusters containing interstitial Ni(η2-C2)4 and Ni2(μ-η2-C2)4 acetylide moieties: mimicking the supersaturated Ni–C solutions preceding the catalytic growth of CNTs with the structures of [HNi25(C2)4(CO)32]3− and [Ni22(C2)4(CO)28Cl]3−

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