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Keywords:

  • Iron;
  • Pyridyl complexes;
  • Amino complexes;
  • Pyridylmethylamines

Abstract

2-Pyridylmethylamine (amp) and 8-aminochinoline (ach) readily form the following complexes with iron halides in methanol: [(amp)2FeCl2] (1a), [(amp)2FeBr2] (1b), [(ach)2Fe(MeOH)2]Br2 (1c), and [(amp)FeCl2(μ-OMe)]2 (2). Methanol was chosen as a solvent because these reactions are rather complex in ether. For example, FeCl3 forms the ionic complex pair [(dme)2FeCl2] [FeCl4] (3) with 1,2-dimethoxyethane (dme). The reaction of FeBr2 with tridentate di(2-pyridylmethyl)amine (dpa) and tetradentate 1,2-dipyridyl-1,2-diaminoethane (dpdae) yields the complexes [(dpa)2Fe]Br2·2 MeOH (4) and [(dpdae)2Fe] [FeBr4] (5), respectively. Crystallographic and magnetochemical investigations show the high-spin configuration for the complexes 1 and 2, whereas the short Fe-N distances of 4 clearly indicate a low-spin state. Compound 2 exhibits an antiferromagnetic exchange interaction with a coupling constant J = −29.4 cm−1 (H;af = −J S;afA·S;afB).