= Lawrence F. Dahl
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<Lawrence F. Dahl> investigated the structure of an <iron> carbonyl tetramer by <diffraction>. Four bonded <iron> <atoms> form a <tetrahedron>, while four triply bridging <carbonyl> carbon <atoms> form an interpenetrating <tetrahedron>, connecting an unusual <molecular geometry> with metal–metal bonding.<Structural Characterization of the Cyclopentadienyliron Carbonyl Tetramer, Fe4(eta5-C5H5)4(CO)4. A Cubane-Type Structure Containing a Completely Bonding Tetrametal Cluster Unit by Melvin A. Neuman and others>[1972, pp.3383–3388: original diffraction structure and tetrametal cluster unit]{ref}
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