Photochemical Synthesis and Stereodynamic Behavior of Alkoxy-Bridged (Silylene) (germylene)iron Complexes

Julian R. Koe, Hiromi Tobita, Hiroshi Ogino

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)


Mixed (silylene) (germylene)iron complexes have been synthesized for the first time and are internally stabilized by a donor bridging alkoxy group: [Cp′(CO)Fe{GeMe2--O(R)--SiMe2|] (Cp′= C5Me5; R = Me, But). Two-dimensional and variable-temperature 1H NMR spectroscopies establish germylene-methyl group exchange. Computer simulation of the spectra and calculation using the Eyring equation yield values for ΔG298 for the process of 62 kJ mol−1 (R = Me) and 61 kJ mol−1 (R = But). A mechanism involving cleavage of the Ge--O partial bond, followed by rotation of the resulting coordinated germylene moiety about the Fe=Ge double bond, is proposed for this exchange. The (silylene) (germylene)iron complexes are weighted toward the (methoxysilyl) (germylene) form, indicating that germylene ligands are more stable than their silicon analogues.

Original languageEnglish
Pages (from-to)2479-2483
Number of pages5
Issue number7
Publication statusPublished - 1992 Jul 1


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