TY - JOUR
T1 - Magnetic assemblies based on Mn(III) salen analogues
AU - Miyasaka, Hitoshi
AU - Saitoh, Ayumi
AU - Abe, Satoshi
N1 - Funding Information:
This paper is dedicated to present and past members of the Miyasaka research group and to our collaborators, whose efforts contributed to the advancement of our research on magnetic assemblies based on Mn(III) salen complexes. H.M. thanks PRESTO and CREST projects of JST, and a Grant-in-Aid for Scientific Research on Priority Areas (“Chemistry of Coordination Space,” Grant No. 18033042) from the Ministry of Education, Culture, Sports, Science, and Technology, Japan, which have financially supported recent our research.
PY - 2007/11
Y1 - 2007/11
N2 - 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.
AB - 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.
KW - Assembled compounds
KW - Bulk magnetism
KW - Magnetic properties
KW - Mn(III) salen-type complexes
KW - Superparamagnetism
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U2 - 10.1016/j.ccr.2007.07.028
DO - 10.1016/j.ccr.2007.07.028
M3 - Review article
AN - SCOPUS:35148824712
VL - 251
SP - 2622
EP - 2664
JO - Coordination Chemistry Reviews
JF - Coordination Chemistry Reviews
SN - 0010-8545
IS - 21-24
ER -