Interaction of trirhenium(III) cluster alkyls with carboxylic acids, β-diketones, and diphenyltriazene
Abstract
The interaction of the triangulo-trirhenium cluster alkyls, Re3Cl3(CH2SiMe3)6 and Re3Me9, With carboxylic acids, β-diketones, and 1,3-diphenyltriazene leads to partial or complete loss of tetramethylsilane or methane from the end alkyl groups, respectively, and the formation of rhenium(III) complexes that may be either monomeric, i.e. triangulo-trirhenium, Re3, or dimeric in which two such units are linked together by carboxylate bridges to give Re6 species.
Examples of monomeric complexes are the benzoate, Re3Cl3(CO2Ph)6, β-diketonates, Re3Me6(β-dik)3, and the diphenyltriazenide, Re3Cl3(CH2SiMe3)3(PhN3Ph)3.
The dimeric complexes are carboxylates such as Re6(µ-Cl6)(CH2SiMe3)6(µ-CO2Me)6 and Re6(µ-Me6)Me6(µ-CO2Me)6, in which the Cl or Me bridges between rhenium atoms in each Re3 triangle are retained.
I.r. and 1H n.m.r. spectra are reported and likely structures for the complexes suggested.