119Sn-Moessbauer Spectroscopic Studies of Tin(IV) Chloride Adducts of Ferrocenylruthenocene and Biruthenocene

Abstract

An orange colored stable adduct of SnCl4 with biruthenocene was prepared by treating SnCl4 with biruthenocene in a dry solution of benzene mixed with hexane, while a less stable adduct with ferrocenylruthenocene was obtained in the same procedure. Covalently bonded tin(IV) species were found in 119Sn-Moessbauer spectroscopy of both the adducts. The results suggest the presence of a direct chemical bonding between Ru and Sn atoms in these adducts.

Ruthenocenes and Osmocenes

“…An intermediate radical species, possibly [Ru"(C 5 H 4 »)Cp], was reduced (TiCl 3 ). 189 ' 190 Mass spectral studies suggest that the Cp-Ru bond strength is greater than the Cp-Fe bond strength in FcRc. Biruthenocene is disordered in the solid state and adopts the transoid conformation, the mutual orientation of the Cp rings depending on intermolecular interactions.…”

“…2 0 5 ' 2 0 6 A direct bond is formed between the relatively basic nonbonding e 2g orbital around the ruthenium atom and the Lewis acid; probable structures are discussed below under the individual Lewis acids. 189 …”