2-Pyridylmetallocenes, Part IX. Sulphur-Substituted 2-Pyridylferrocene: Synthesis and Reactivity towards Pt(II) and Hg(II).

Thio-substituted 2-pyridylferrocenes [CpFe{CH(X)(CHN)}] (X = SOTol, ; SMe, ) were prepared from [CpFe(CHR)] (R = SOTol, ; 2-CHN, ) in moderate yields. The reactions of and with [PtCl(DMSO)] yielded the binuclear N, S chelated complexes [CpFe{CH(X)(CHN)}-(к-N,S)-PtCl] (X= SOTol, , SMe, ), while the reaction of with Hg(OAc)/LiCl led to cyclomercuration with generation of [CpFe{CH(SMe)(CHN)(HgCl)}], . The crystal structures of ·CHCl and were determined. The structure of showed a weak intramolecular Fe…Pt interaction and several weak intermolecular interactions involving all Cl atoms. Weak intermolecular interactions between Hg and S atoms in the cyclomercurated led to a tetrameric structure involving a HgS ring.