Li, Lihong, Becker, Jan M., Allan, Laura E. N., Clarkson, Guy J., Turner, S. S. and Scott, Peter (2011) Structural and electronic modulation of magnetic properties in a family of chiral iron coordination polymers. Inorganic Chemistry, Vol.50 (No.13). pp. 5925-5935. doi:10.1021/ic102291r

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Abstract

The complexes FeL(2) [L = bidentate Schiff base ligands obtained from (R)-(+)-alpha-phenylethanamine and 4-substituted salicylaldehydes, substituent R = H, (t)Bu, NO(2), OMe, CN, OH] react with ditopic proligands 1,4-pyrazine (pz) or 4,4'-bipyridine (bpy), to give a family of optically pure Fe(II) polymeric chain complexes of formula {FeL(2)(mu-pz)}(infinity) and {FeL(2)(mu-bpy)}(infinity). Crystallographic studies show that a range of structures are formed including unidirectional and bidirectional linear polymers and canted zigzag chains. Interchain interactions via pi-contacts and hydrogen bonding are also observed. SQuID magnetometry studies on all of the complexes reveal antiferromagnetic interactions, the magnitudes are rationalized on the basis of substituent electronic properties and bridging ligand identity. For complexes with bridging pz, the antiferromangnetic interaction is enhanced by electron-releasing substituents on the Fe units, and this is accompanied by a contraction in the intrachain distance. For complexes bridged with the longer bpy the intrachain antiferromagnetic couplings are much weaker as a result of the longer intrachain distance. The magnetic data for this series of chain complexes follow a Bonner-Fisher 1D chain model, alongside a zero field splitting (ZFS) model for Fe(II) (S = 2) as appropriate. The intrachain antiferromagnetic coupling values, g-factors, and the axial ZFS parameter D were obtained.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics Q Science > QD Chemistry
Divisions:	Faculty of Science > Chemistry
Library of Congress Subject Headings (LCSH):	Chirality, Crystallography, Antiferromagnetism, Iron -- Magnetic properties, Metal complexes -- Magnetic properties, Coordination polymers -- Magnetic properties
Journal or Publication Title:	Inorganic Chemistry
Publisher:	American Chemical Society
ISSN:	0020-1669
Official Date:	4 July 2011
Dates:	Date Event 4 July 2011 Published
Volume:	Vol.50
Number:	No.13
Page Range:	pp. 5925-5935
DOI:	10.1021/ic102291r
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access

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