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

Abstract

Trimethylstannyl perrhenate, (CH 3 ) 3 SnOReO 3 (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 [ReO 4 ] 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 [(CH 3 ) 3 Sn] + [ReO 4 ]⁻. Following the synthesis of the title compound 2, the heavier congener triphenylplumbyl perrhenate (5) has been synthesized from Re 2 O 7 and Pb(C 6 H 5 ) 4 .