American Chemical Society
ja982425f_si_002.cif (191.13 kB)

Compounds with Two Metal−Metal Multiple Bonds:  New Ways of Making Doublets into Cyclic Quartets

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posted on 1998-11-20, 00:00 authored by F. Albert Cotton, Lee M. Daniels, Isabelle Guimet, Robert W. Henning, Glenn T. Jordan, Chun Lin, Carlos A. Murillo, Arthur J. Schultz
New types of products obtained by combining two dinuclear multiply metal−metal bonded species (doublets) to obtain cyclic tetranuclear products (quartets) are reported. One new type consists of pairs of quadruply bonded Mo24+ units united by two μ-X links (X = H, OH, O) although in the last case oxidation has also occurred so that these are Mo25+ moieties. In these cases, the subunits are Mo2(DArF)3. The second new type consists of Mo2(DArF)2 subunits linked by four μ-X bridges, where X = Cl, Br, I. The previously known compound Mo4I8(PBun3)4 has been shown to differ from all previously known Mo4X8(PR3)4 molecules (X = Cl, Br) by retaining two quadruple bonds instead of being a metallacyclobutadiyne, as are the others.