Control of the hapticity of pyridine-2-thiolate ligands in rhenium(V) oxo complexes†

Abstract

Treatment of [ReO{κ³-B(pz)₄}(OMe)₂] 1 with pyridine-2-thiol ligands led to [ReO{κ²-B(pz)₄}(κ²-Spy*)(OMe)] (Spy* = 2-SC₅H₄N 2 or 2-SC₅H₃NSiMe₃-3 3) or [ReO{κ³-B(pz)₄}(κ¹-2-SC₅H₄N)₂] 4, depending on the reaction conditions. Complexes 2 and 3 reacted with trimethylsilyl chloride yielding [ReO{κ³-B(pz)₄}(κ¹-2-SC₅H₄N)Cl]·HCl 6 and [ReO{κ³-B(pz)₄}Cl₂], respectively. The characterization of the new compounds involves IR and ¹H NMR spectroscopies, and X-ray diffraction analysis for 3, 4 and 6.