Metal Complexes of Dithiatetrazocines

Abstract

Dithiatetrazocines of the type 1,5-E₂N₄S₂ (E=Me₂NC, R₂P) form the transition metal complexes M(PR₃)₂(1,5-E₂N₄S₂) (M=Pt, Pd, Ni) which involve an η²- S, S′ interaction with the metal. A reversible elimination of R₃P from these mononuclear complexes gives the binuclear complexes [M(PR₃)(1,5-E₂N₄S₂)]₂. These complexes have been shown by ³¹P NMR to undergo a fluxional process involving a [1, 31 metallotropic shift. Mononuclear metal complexes may also be prepared from the novel dianion 1,5-Ph₄P₂N₄S₂ ^2-and the appropriate metal dihalide complex.