4.5 Article

Directed synthesis and magnetic properties of a hexanuclear ferric cluster

Journal

POLYHEDRON
Volume 151, Issue -, Pages 446-451

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.poly.2018.06.004

Keywords

Ferric complexes; Clusters; Spin frustration; Antiferromagnetic exchange; Coordination chemistry

Funding

  1. National Science Foundation [CHE-1464955]
  2. University of Idaho
  3. NSF [DMR-1157490, ACI-1548562]
  4. State of Florida

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The hexanuclear iron(III) complex, [Fe-6(mu(3)-3-bpp)(4)(mu(3)-O)(2)(mu(2)-OMe)(3.67)(mu(2)-OH)(0.33)Cl-2]center dot 0.33MeOH center dot H2O (1) was synthesized by a redox reaction between FeCl2, AgNO2, and 3-H(2)bpp in methanol (3-H(2)bpp = 2,6-bis(3-pyrazolyl)pyridine). The crystal structure of the complex is composed of two trinuclear subunits related by an inversion operation. This symmetry results in an overall octahedral arrangement of Fe (Ill) sites within the cluster. The four equatorial Fe sites are linked together by mu(2)-OMe- and mu(2)-OH- bridges, while each of the four 3-bpp(2-) bridges spans two axial and one equatorial Fe sites. The two Cl- ligands cap the axial Fe sites. The difference in the coordination environment for the equatorial and axial Fe sites is validated by the observation of two quadrupole doublets in the Mossbauer spectrum of 1, which also confirms that all metal sites correspond to the high-spin Fe(III) ions. Temperature-dependent magnetic susceptibility data reveal strong antiferromagnetic exchange coupling between the Fe(III) centers, which is also justified by quantum-chemical calculations at the density-functional level of theory. (C) 2018 Elsevier Ltd. All rights reserved.

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