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Issue 12, 1997
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Pyridine-2-carboxamide complexes of arylimidorhenium(VI) derived from 2-pyridylmethyleneamine complexes of arylimidorhenium(V) via oxygen-atom transfer

Abstract

Complexes of type [Re V L(NC 6 H 4 Y-p)Cl 3 ] (Y = H or Cl) have been synthesized where L is the Schiff base formed from pyridine-2-carbaldehyde and the aniline p-XC 6 H 4 NH 2 (X = Me or Cl). Treatment with aqueous nitric acid in acetonitrile converts them into [Re VI L′(NC 6 H 4 Y-p)Cl 3 ], 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(NC 6 H 4 Cl)Cl 3 ] and [ReL′(NC 6 H 4 Cl)Cl 3 ] (X = Me in both cases) revealed the presence of severely distorted and meridionally configured ReCl 3 N 3 co-ordination spheres. The effective metal radius decreases only marginally upon metal oxidation and the imide fragment is approximately linear and triple bonded, Re[triple bond, length as m-dash]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.

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Article information


J. Chem. Soc., Dalton Trans., 1997, 2149-2154
Article type
Paper

Pyridine-2-carboxamide complexes of arylimidorhenium(VI) derived from 2-pyridylmethyleneamine complexes of arylimidorhenium(V) via oxygen-atom transfer

S. Banerjee, B. Kumar Dirghangi, M. Menon, A. Pramanik and A. Chakravorty, J. Chem. Soc., Dalton Trans., 1997, 2149
DOI: 10.1039/A700529F

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