Jump to main content
Jump to site search

Issue 44, 2012
Previous Article Next Article

[FeIII(dmbpy)(CN)4]: a new building block for designing single-chain magnets

Author affiliations

Abstract

We herein present the synthesis and magneto-structural study of a new family of heterobimetallic chains of general formula {[FeIII(dmbpy)(CN)4]2MII(H2O)2}n·pnH2O [dmbpy = 4,4′-dimethyl-2,2′-bipyridine; M = Mn (2), Cu (3), Ni (4) and Co (5) with p = 4 (2), 3 (3), 9 (4) and 3.5 (5)] which were prepared by using the mononuclear PPh4[FeIII(dmbpy)(CN)4]·3H2O (1) building block (PPh4+ = tetraphenylphosphonium) as a ligand toward fully solvated MII ions. The structure of 1 consists of discrete [FeIII(dmbpy)(CN)4] anions, tetraphenylphosphonium cations and noncoordinated water molecules. Complexes 2–5 are isostructural compounds whose structure consists of neutral 4,2-wave like heterobimetallic chains of formula {[FeIII(dmbpy)(CN)4]2MII(H2O)2}n where the [FeIII(dmbpy)(CN)4] entity adopts a bis-monodentate coordination mode toward trans-[MII(H2O)2] units through two of its four cyanide groups in cis positions. 1 exhibits the magnetic behaviour of magnetically isolated six-coordinate low-spin Fe(III) complexes with an important orbital contribution. 2 behaves as ferrimagnetic FeIII2MnII chains, whereas 3–5 exhibit intrachain ferromagnetic couplings between the low-spin Fe(III) and either Cu(II) (3), Ni (4) or Co(II) (5) as well as frequency-dependence of the out-of-phase ac susceptibility signals below 3.0 (3), 5.5 (4) and 5.0 K (5). The relaxation time and the energy to reverse the magnetization of 3–5 are related to the anisotropy of the M(II) center and to the intra- and interchain magnetic interactions. Unprecedentedly in the world of cyanide-bearing complexes, 5 exhibits a double slow relaxation of the magnetization.

Graphical abstract: [FeIII(dmbpy)(CN)4]−: a new building block for designing single-chain magnets

Back to tab navigation

Supplementary files

Publication details

The article was received on 25 Jul 2012, accepted on 11 Sep 2012 and first published on 11 Sep 2012


Article type: Paper
DOI: 10.1039/C2DT31675G
Citation: Dalton Trans., 2012,41, 13716-13726
  •   Request permissions

    [FeIII(dmbpy)(CN)4]: a new building block for designing single-chain magnets

    L. M. Toma, J. Pasán, C. Ruiz-Pérez, F. Lloret and M. Julve, Dalton Trans., 2012, 41, 13716
    DOI: 10.1039/C2DT31675G

Search articles by author

Spotlight

Advertisements