= Trinh-Toan
{c}
<Trinh-Toan> helped characterize an <iron> carbonyl tetramer by <diffraction>. Its four metal <atoms> form a bonded <tetrahedron>, interpenetrated by a second <tetrahedron> of triply bridging <carbonyl> carbon <atoms>. The result is a concrete structural example of a metal <metal cluster>.<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, original tetramer diffraction study, pp.3383–3388]{ref}
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