Synthesis, characterisation and study of the reactivity of the first platinum(ii) complex having a [C(sp2, ferrocene),N,N′]− terdentate ligand

Abstract

The study of the reactivity of [(η⁵-C₅H₅)Fe{(η⁵-C₅H₄)–CHN–(CH₂)₃–NMe₂}] (1) with cis-[PtCl₂(dmso)₂] is reported. These studies have allowed the isolation and characterisation of two isomeric forms of cis-[Pt{(η⁵-C₅H₅)Fe[(η⁵-C₅H₄)–CHN–(CH₂)₃–NMe₂])}Cl₂] (2a and 2b), which differ in the conformation of the ligand [syn-(Z) in 2a and anti-(E) in 2b], and the first platinacycle containing a terdentate [C(sp², ferrocene),N,N′]⁻ ligand: [Pt{[(η⁵-C₅H₃)–CHN–(CH₂)₃–NMe₂]Fe(η⁵-C₅H₅)}Cl] (3). The relative importance of the factors governing the formation of 3 is discussed. The X-ray crystal structures of 2a and 3 are described and confirm the mode of binding of the ligand to the platinum(II). The study of the reactivity of 3 with PPh₃ or CH₃I is also reported.