| Abstract
| - Modification of the nickel dithiolate metalloligand, Ni(bme-daco) [where bme-daco = bis(mercaptoethyl)diazacyclooctane] or Ni-1, by oxygenation of one thiolate into a sulfinate, Ni(mese-daco) [where mese-daco =(mercaptoethyl)(sulfinatoethyl)diazacyclooctane] or Ni-2, restricts the ligating ability to monodentate and is expectedto reduce the donor ability of the remaining thiolate S. Nevertheless, the Ni-2 complex forms a stable thiolateS-bound adduct of W0(CO)5, (Ni-2)W(CO)5, a complex whose ν(CO) IR spectrum reports insignificant differencesin the donor abilities of Ni-1 and Ni-2 in (η1-NiN2S2)W(CO)5 complexes. In the presence of the strong sulfophileCuI, a CuNi2 trimetallic, (Ni-2)2CuBr, was isolated. Another trimetallic, (μ-η2-Ni-1)[W(CO)5]2, demonstrated the Ni(bme-daco), Ni-1, unit to bridge low-valent metals in a transoid configuration, yielding W−W distances of over 5 Å.
- The synthesis and characterization of three new compounds are used to probe the hypothesis that nickel thiolate complexes should be considered as simple S-donor ligands that have predictable properties that can be used in designed syntheses of polyheterometallic complexes.
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