Abstract
Tetrakis(di-tert-butylmethylsilyl)tetragermacyclobutadiene]ruthenium tricarbonyl [η4-(But 2MeSi)4Ge4]Ru(CO)3 is synthesized. This analogue of well-known cyclobutadiene transition metal complexes bears a tetragermacyclobutadiene derivative as ligand. The structure and spectroscopic parameters of the complex are compared with those of its iron-containing analogue [η4-(But 2MeSi)4Ge4]Fe(CO)3. Based on experimental data and results of quantum chemical calculations, it is shown that the π-donating ability of ligands increases upon replacement of carbon atoms in the cyclobutadiene moiety by silicon or germanium atoms, tetrasilacyclobutadiene and tetragermacyclobutadiene being comparable in π-donating activity.
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Dedicated to Academician of the Russian Academy of Sciences M. P. Egorov on the occasion of his 60th birthday.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 2551—2553, Novemer, 2013.
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Lee, V.Y., Ito, Y. & Sekiguchi, A. (Tetragermacyclobutadiene)ruthenium tricarbonyl [η4-(But 2MeSi)4Ge4]Ru(CO)3 . Russ Chem Bull 62, 2551–2553 (2013). https://doi.org/10.1007/s11172-013-0370-0
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DOI: https://doi.org/10.1007/s11172-013-0370-0