Mehrfachbindungen zwischen Hauptgruppenelementen und Übergangsmetallen, LXXIX. / Multiple Bonds between Main Group Elements and Transition Metals, LXXIX.

Abstract

Trimethylstannyl perrhenate, (CH3)3SnOReO3 (2), synthesized from dirheniumheptoxide and tetramethyltin, has a zigzag-chain crystal structure. This structure originates from catenation of individual molecules via the tin atom to a perrhenate group of another molecule. The tin atom thus forms the center of a trigonal-bipyramidal coordination geometry, with two oxygen atoms adopting apical positions while three methyl groups define the equatorial plane. The Re—O—Sn bonds alternate between linear and slightly bent. The zigzag-aggregation of the chain-structure results from the tetrahedral [ReO4] subunits. Ionic contributions to the Re—O—Sn bonds are not evident from the structural data, nor do data obtained from solution indicate any ionization such as [(CH3)3Sn]+[ReO4]⁻. Following the synthesis of the title compound 2, the heavier congener triphenylplumbyl perrhenate (5) has been synthesized from Re2O7 and Pb(C6H5)4.