A vertex-sharing double square pyramid of cobalt(II) ions (see picture) is present in the nonanuclear complex 1, obtained by treating cobalt acetate with 0.5 equivalents of (py )CO. The corresponding 1:1 reaction gave 2, which has a central core with a cubane structure. py=pyridine.

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http://dx.doi.org/10.1002/(SICI)1521-3773(19990401)38:7<983::AID-ANIE983>3.0.CO;2-KDOI Listing

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