Synthesis and structure of bimetallic complexes with σ,π-bridging thienyl and benzothienyl ligands

Abstract

The ligand properties of the organometallic fragment (η⁵-SC₄H₃)Cr(CO)₃ were studied in the new σ,π-bimetallic complexes [Cr{(η⁵-SC₄H₃)PtL₂ (SC₄H₃)}(CO)₃] with L = CO and PMe₃ 1 or L₂ = dppe [1,2-bis(diphenylphosphino)ethane] 2, [Cr{(η⁵-SC₄H₃)Au(PPh₃ )}(CO)₃] 3 and [Cr(η⁵-SC₄H₃SnMe₃)(CO) ₃] 4. Whereas the intermediates [Cr{(η⁵-SC₄H₃)PtL₂ Cl}(CO)₃] (L = PMe₃ or dppe) and [Pt{(SC₄H₃)Cr(CO)₃}₂ L₂] were too unstable to isolate and characterize, 4 slowly converted into [Cr{η⁵-SC₄H₂(SnMe₃ )₂}(CO)₃] 5. By contrast, the reaction of lithiated [Cr(η⁶-SC₈H₆)(CO)₃] with [Pt(dppe)Cl₂] afforded the stable trinuclear complex, [Pt{(η⁶-SC₈H₅)Cr(CO)₃ }₂(dppe)] 6.

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