Synthesis of the Ferrocene Derivative FcCHN(CH<sub>2</sub>)<sub>2</sub>SH [Fc = (η<sup>5</sup>-C<sub>5</sub>H<sub>5</sub>)Fe(η<sup>5</sup>-C<sub>5</sub>H<sub>4</sub>)]: Reactivity toward (Phosphine)gold(I) Cations
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The condensation reaction of ferrocenecarbaldehyde with β-mercaptoethylamine gives FcCHN(CH2)2SH [Fc = (η5-C5H5)Fe(η5-C5H4)], which is easily oxidized to the disulfide derivative FcCHN(CH2)2S2(CH2)2NCHFc. Treatment of FcCHN(CH2)2SH with [AuCl(PPh3)] in the presence of Na2CO3 affords the thiolate gold(I) complex [FcCHN(CH2)2S(AuPPh3)]. Further reaction of the latter with various molar ratios of [Au(TfO)PPh3] (TfO = trifluoromethanesulfonate) leads to di-, tri-, and tetranuclear gold species in which the metallic centers are bonded to the sulfur and nitrogen ligands. The reaction of FcCHN(CH2)2SH with [Au2(TfO)2(μ-dppf)] in a 1:1 or 1:2 molar ratio has also been carried out to give [FcCHN(CH2)2S{Au2(μ-dppf)}]TfO or [FcCHN(CH2)2S{Au2(μ-dppf)}2](TfO)3. The crystal structure of [FcCHN(AuPPh3)(CH2)2S(AuPPh3)2](TfO)2 reveals short gold−gold interactions.
