Structural characterizations of an Re(IV) complex [ReCl4(OPPh3)2] and of an imino species [ReOCl2(PPh3)(η2-OC6H4-2-CHNH)] prepared from the reaction of [ReOCl3(PPh3)2] with salicylaldoxime

The reaction of [ReOCl3(PPh3)2] with salicylaldoxime unexpectedly yields [ReCl4(OPPh3)2] (1) and [ReOCl2(PPh3)(η2-OC6H4-2-CHNH)] (2). The crystal structure of the Re(IV) complex 1 consists of discrete mononuclear units. The Re site is bound to four chlorides and two trans oxygens of the OPPh3 groups. The crystal structure of 2 is also mononuclear with the geometry of the Re(V) center defined by a terminal oxo-group, two cis chlorides, the phosphorus of the PPh3, and the nitrogen and oxygen donors of the phenoxyimino ligand [OC6H4-2-CHNH]−.