Issue 45, 2013

Triple-stranded ferric helices: a π–π interaction-driven structural hierarchy of Fe5, Fe7, and Fe17 clusters

Abstract

Three polypyridine ligand-supported multinuclear iron complexes, [Fe5], [Fe7] and [Fe17], were synthesized and their physical properties were investigated. The complexes had triple-stranded helical structures with pseudo threefold symmetry, and were stabilized by varying degrees of intramolecular π–π stacking. The pentanuclear iron complex consisted of two FeII and three FeIII ions, supported by three ligands, while the heptanuclear complex comprised four FeII centres, three FeIII ions, and six ligands, and the heptadecanuclear complex contained seventeen FeIII ions and nine ligands. Electrochemical studies revealed that the pentanuclear and heptanuclear iron complexes showed pseudo-reversible three- and five-step redox behaviours, respectively. Magnetic measurements conducted on the pentanuclear and heptanuclear complexes revealed that antiferromagnetic interactions were operative between neighbouring iron ions through the oxo- and pyrazole-bridges.

Graphical abstract: Triple-stranded ferric helices: a π–π interaction-driven structural hierarchy of Fe5, Fe7, and Fe17 clusters

Supplementary files

Article information

Article type
Paper
Submitted
04 Jun 2013
Accepted
05 Sep 2013
First published
24 Sep 2013

Dalton Trans., 2013,42, 16185-16193

Triple-stranded ferric helices: a π–π interaction-driven structural hierarchy of Fe5, Fe7, and Fe17 clusters

T. Shiga, M. Noguchi, H. Sato, T. Matsumoto, G. N. Newton and H. Oshio, Dalton Trans., 2013, 42, 16185 DOI: 10.1039/C3DT51480C

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