Synthesis and Reactivity of Coordination and Six-Membered, Cyclometalated Platinum Complexes Containing a Bulky Diimine Ligand

Abstract

The reaction of [Pt2Me4(μ-SMe2)2] with ligand (9-C14H9)CH═NCH2CH2N═CH(9-C14H9) (L) gives initially the platinum(II) complex [PtMe2{(9-C14H9)CH═NCH2CH2N═CH(9-C14H9)}], 1, which contains a chelate dinitrogen ligand. Compound 1 was reacted with MeI to give the related six-coordinate platinum(IV) compound [PtMe3I{(9-C14H9)CH═NCH2CH2N═CH(9-C14H9)}], 2, by oxidative addition. Compound 1, when refluxed in toluene, gave the monometalated complex [PtMe{(9-C14H9)CH═NCH2CH2N═CH(9-C14H8)}], 3, with a six-membered, cyclometalated, anthryl ring. When compound 1 was reacted with acetyl chloride, the dicyclometalated compound [Pt{(9-C14H8)CH═NCH2CH2N═CH(9-C14H8)}], 4, with two six-membered cyclometalated anthryl rings, was formed. Similarly, cis-[PtCl2(dmso)2] was reacted with ligand L to afford the platinum(II) compound [PtCl2{(9-C14H9)CH═NCH2CH2N═CH(9-C14H9)}], 5. This compound, when left in solution at room temperature, gave the monometalated compound [PtCl{(9-C14H9)CH═NCH2CH2N═CH(9-C14H8)}], 6, but under no condition...