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Título

Mesitylgold(I) and silver(I) perfluorocarboxylates as precursors of supramolecular Au/Ag systems

AutorFernández, Eduardo J.; Laguna, Antonio ; López-de-Luzuriaga, José M.; Montiel, Manuel; Olmos, M. Elena; Pérez, Javier; Puelles, Raquel C.
Fecha de publicación26-jul-2006
EditorAmerican Chemical Society
CitaciónOrganometallics 25(18): 4307–4315 (2006)
ResumenReaction of [Ag(CF3CO2)] with tetrahydrothiophene (tht) (2:1) in dichloromethane leads to the synthesis of [Ag4(CF3CO2)4(tht)2] (1), which further reacts with mesitylgold(I) ([Au(mes)]) (1:1) to afford [AuAg4(mes)(CF3CO2)4(tht)]n (3). Treatment of [Au(mes)] with [Ag(RCO2)] (R = CF3, CF2CF3) and tht (molar ratio 1:4:1 or 1:4:3) leads to the new Au/Ag systems [AuAg4(mes)(RCO2)4(tht)x]n (x = 1, R = CF3 (3), CF2CF3 (4); x = 3, R = CF3 (5), CF2CF3 (6)). The crystal structures of 3, 4, and 6 have been established by X-ray diffraction, all of them displaying Au···Ag interactions supported by mesityl ligands that bridge three metal centers in an unprecedented situation in transition metal chemistry. Additional Au−S−Ag and Ag−O−Ag (3 and 4) or Ag−S−Ag (6) bonds result in two-dimensional polymers that contain both Au···Ag and Ag···Ag contacts. Treatment of 3 with water (1:2) in dichloromethane leads to {[AuAg4(mes)(CF3CO2)4(tht)(H2O)]·H2O·CH2Cl2}n (7), whose crystal structure shows the partial break of the cyclic [Ag2(μ-RCO2)2] dimer present in the structures of 3, 4, and 6, probably caused by the coordination of one molecule of water to one of the AgI centers. It also displays Au···Ag and Ag···Ag interactions, as well as Ag−C bonding interactions and additional Ag−O contacts, which result in a monodimensional polymer. The crystal structure of 1 has also been determined by X-ray diffraction.
Descripción9 pages, 9 figures, 6 tables.
Versión del editorhttp://dx.doi.org/10.1021/om060413u
URIhttp://hdl.handle.net/10261/19552
DOI10.1021/om060413u
ISSN0002-7863
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