Oxorhenium(V) complexes containing tridentate Schiff-base and monothiol coligands

The reaction of [n-(C₄H₉)₄N][ReOBr₄(OPPh₃)] with the tridentate Schiff-base [HOC₆H₄C(H)NC₆H₄SH] allows for the isolation of [ReOBr{η³-(OC₆H₄C(H)NC₆H₄S)}] (1). The reaction of [n-(C₄H₉)4N][ReOBr₄(OPPh₃)] with [HOC₆H₄C(H)NC₆H₄SH] and the appropriate benzenethiol (C₆H₄X-4-SH) where X = H, Br, Cl, F, and OCH₃ in methanol-acetonitrile treated with triethylamine has led to the isolation of a series of rhenium complexes of the type [ReO{η³-(OC₆H₄C(H)NC₆H₄S)} (η¹-C₆H₄X-4-S)] (X = H (2), Br (3), Cl (4), F (5), and OCH₃ (6)). Likewise, under similar reaction conditions, the use of benzylmercaptan ligands of the type (C₆H₄X-4-CH₂SH) where X = H, Cl, F, and OCH₃ has led to the isolation of a series of rhenium complexes of the type [ReO{η³-(OC₆H₄C(H)NC₆H₄S)} (η¹-C₆H₄X-4-CH₂S)] (X=H (7), Cl (8), F (9), and OCH₃ (10)). The incorporation of the appropriate amine functionality into the substituent R of the monodentate ligand allows for the isolation of a cationic oxorhenium(V) species, namely, [ReO{η³-(OC₆H₄C(H)NC₆H₄S)} (η-C₅H₄NH-2-S)][Br] (11). (C) 2000 Elsevier Science S.A.