Synthesis, characterisation and study of the reactivity of the first platinum( ii ) complex having a [C(sp 2 , ferrocene),N,N′] − terdentate ligand

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.