Complexes of type [ReVL(NC6H4Y-p)Cl3] (Y = H or Cl) have been synthesized where L is the Schiff base formed from pyridine-2-carbaldehyde and the aniline p-XC6H4NH2 (X = Me or Cl). Treatment with aqueous nitric acid in acetonitrile converts them into [ReVIL′(NC6H4Y-p)Cl3], where L′ is a monoanionic pyridine-2-carboxamide. The latter complexes display hyperfine-split six-line solution EPR spectra at room temperature. The crystal structures of [ReL(NC6H4Cl)Cl3] and [ReL′(NC6H4Cl)Cl3] (X = Me in both cases) revealed the presence of severely distorted and meridionally configured ReCl3N3 co-ordination spheres. The effective metal radius decreases only marginally upon metal oxidation and the imide fragment is approximately linear and triple bonded, Re≡N-C, in both cases. The rhenium(VI)-rhenium(V) reduction potentials in the two types of complex are ≈1.0 and ≈0.2 V respectively.
|Original language||English (US)|
|Number of pages||5|
|Journal||Journal of the Chemical Society - Dalton Transactions|
|State||Published - Jun 21 1997|
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