Novel heterotetrametallic compounds derived from 1-(ferrocenylethynyl)(η6-arene)tricarbonylchromium

The synthesis and characterization of two new heterotetrametallic complexes are described. Reaction of [Cr(CO)3(η6-C6H5)CC-{(η5-C5H4)Fe(η5-C5H5)}](1) with Co2(CO)8 or Cp2Mo2(CO)4 afford the heterotetrametallic complexes [Cr(CO)3(η6-C6H5){Co2(CO)6-μ2-η2-CC–}(η5-C5H4)Fe(η5-C5H5)}](2), and [Cr(CO)3(η6-C6H5){Mo2Cp2(CO)4-μ2-η2-CC–}(η5-C5H4)Fe(η5-C5H5)](3) in 80% and 41% yield, respectively. All complexes have been characterized by elemental analysis, multinuclear (1H, 13C) NMR, and by single-crystal X-ray diffraction studies for 1 and 3. Structural data reveal that the coordination of dimolybdenum moiety to the alkyne unit influence the orientation of the carbonyl groups coordinated to the chromium as well as the Cp rings bound to the iron metal centre.

The compounds Co2(CO)8 and Cp2Mo2(CO)4 readily react with [Cr(CO)3(η6-C6H5)CC-{(η5-C5H4)Fe(η5-C5H5)}](1) to give new heterotetrametallic complexes [Cr(CO)3(η6-C6H5){Co2(CO)6-μ2-η2-CC–}(η5-C5H4)Fe(η5-C5H5)}](2), and [Cr(CO)3(η6-C6H5){Mo2Cp2(CO)4-μ2-η2-CC–}(η5-C5H4)Fe(η5-C5H5)](3).Figure optionsDownload as PowerPoint slide