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DOI: 10.1039/A708061A (Paper) Reference Section for: J. Chem. Soc., Dalton Trans., 1998, 1151-1154

Low-spin iron(II) in a small unsymmetrical N6 macrocycle

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Sally Brooker and Timothy J. Simpson

Abstract

A small unsymmetrical N6 macrocycle has been prepared by template methods, from 2,6-di[N-(3-aminopropyl)aminomethyl]pyridine I and 2,6-diacetylpyridine, as [BaL1][ClO4]2 1. Transmetallation with iron(II) perchlorate, in air, yielded an intense dark purple complex, [FeL1][ClO4]2 2. A single-crystal structure determination of 2 revealed that the iron(II) ion has a distorted N6 octahedral geometry. Wrapping of this small, fairly inflexible macrocycle around the octahedral sites on the iron atom is facilitated by the presence of the two amine bonds. The iron(II) is low spin and the 1H and 13C NMR spectra are correspondingly sharp and unshifted.

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