| Abstract
| - The [Z2Ln(THF)]2(μ-η2:η2-N2) complexes (Z = monoanionic ligand) generated by reduction ofdinitrogen with trivalent lanthanide salts and alkali metals are strong reductants in their own right and provideanother option in reductive lanthanide chemistry. Hence, lanthanide-based reduction chemistry can beeffected in a diamagnetic trivalent system using the dinitrogen reduction product, [(C5Me5)2(THF)La]2(μ-η2:η2-N2), 1, readily obtained from [(C5Me5)2La][BPh4], KC8, and N2. Complex 1 reduces phenazine,cyclooctatetraene, anthracene, and azobenzene to form [(C5Me5)2La]2[μ-η3:η3-(C12H8N2)], 2, (C5Me5)La(C8H8), 3, [(C5Me5)2La]2[μ-η3:η3-(C14H10)], 4, and [(C5Me5)La(μ-η2-(PhNNPh)(THF)]2, 5, respectively. Neitherstilbene nor naphthalene are reduced by 1, but 1 reduces CO to make the ketene carboxylate complex{[(C5Me5)2La]2[μ-η4-O2CCCO](THF)}2, 6, that contains CO-derived carbon atoms completely free ofoxygen.
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