Magnetic assemblies based on Mn(III) salen analogues

Hitoshi Miyasaka, Ayumi Saitoh, Satoshi Abe

Research output: Contribution to journalReview articlepeer-review

342 Citations (Scopus)

Abstract

Assembled Mn(III) salen-type quadridentate Schiff-base (SB) complexes, [MnIII(SB)]n+, with various metal-containing/non-metal building blocks and their synthetic strategies are summarized. With the Mn(III) salen-type complexes, it is possible to have two coordination labile sites in trans- or cis-position as the SB ligand takes a quasi-planar chelate form and a stereoscopic chelate form, respectively, being a coordination-acceptor building block. Particularly in the quasi-planar form, the coordination labile sites face the direction of the Jahn-Teller elongated axis occupying the dz2 orbital with an unpaired electron. Due to this characteristic orbital arrangement, the activity and magnetic-electronic properties of the Mn(III) salen-type complexes can be tuned, at will, by modulating the SB ligand that is equatorially located around the Mn(III) ion and coupled with the empty dx2 - y2 orbital. Both the structural aspects, and magnetic characteristics of assembled compounds are of great interest. This point is the main theme in this review. The high-spin Mn(III) salen-type complexes (S = 2) display strong magnetic uniaxial anisotropy, in which the magnetic easy axis can be unambiguously found as the Jahn-Teller axis. Thus, out-of-plane assembly of the quasi-planar Mn(III) salen-type complexes makes it possible to align the easy axes of the Mn(III) ions. This strategy creates unique magnetic systems involving molecular superparamagnets such as single-molecule magnets and single-chain magnets. So far, variously assembled systems employing Mn(III) salen-type complexes as oligomers, one-dimensional chains, and two- or three-dimensional networks have been designed. By following this review, we would know that the Mn(III) salen-type complexes have the potential as a versatile magnetic source for the design of unique magnetic materials with multiple assembling structures.

Original languageEnglish
Pages (from-to)2622-2664
Number of pages43
JournalCoordination Chemistry Reviews
Volume251
Issue number21-24
DOIs
Publication statusPublished - 2007 Nov

Keywords

  • Assembled compounds
  • Bulk magnetism
  • Magnetic properties
  • Mn(III) salen-type complexes
  • Superparamagnetism

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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