Reactions of Re V , tetradentate Schiff base complexes with tertiary phosphines have previously yielded both rearranged Re V and reduced Re III complexes. To further understand this chemistry, the rigid diiminediphenol (N 2 O 2 ) Schiff base ligand sal 2 phen (N,N'-ophenylenebis(salicylaldimine)) was reacted with (n-Bu 4 N) [ReOCl 4 ] to yield trans-[ReOCl(sal 2 phen)] (1). On reaction with triphenylphosphine (PPh 3 ), a rearranged Re V product cis-[ReO(PPh 3 )(sal 2 phen*)]PF 6 (2), in which one of the imines was reduced to an amine during the reaction, and the reduced Re III products trans-[ReCl(PPh 3 )(sal 2 phen)] (4) and trans-[Re(PPh 3 ) 2 (sal 2 phen)] + (5) were isolated. Reaction of sal 2 phen with [ReCl 3 (PPh 3 ) 2 (CH 3 CN)] resulted in the isolation of [ReCl 2 (PPh 3 ) 2 (salphen)] (3). The compounds were characterized using standard spectroscopic methods, elemental analyses and single crystal X-ray crystallography.
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