Synthesis and structure of a gallate of strontium with Sr-C-Ga three-center two-electron bonds

• Autores: Matthias Westerhausen, Sabine Weinrich, Manfred Oßberger, Norbert Mitzel
• Localización: Inorganic chemistry communications, ISSN 1387-7003, Vol. 6, Nº 1, 2003, págs. 23-25
• Idioma: inglés
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• Resumen

  • The addition reaction of strontium bis[bis(trimethylsilyl)amide] with triethylgallane yields quantitatively strontium bis[triethyl-bis(trimethylsilyl)aminogallate] (1). The strontium cation shows the unusual low coordination number of four to two nitrogen and two carbon atoms. Sr–C bond lengths with a mean value of 282 pm are observed with the Sr–C–Ga three-center two-electron bonds. Due to the mainly ionic character of this compound a fast exchange of the bridging and terminal ethyl groups is observed on the NMR time scale.