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[Fe(III)(dmbpy)(CN)(4)](-): a new building block for designing single-chain magnets.
MedLine Citation:
PMID:  23027527     Owner:  NLM     Status:  Publisher    
We herein present the synthesis and magneto-structural study of a new family of heterobimetallic chains of general formula {[Fe(III)(dmbpy)(CN)(4)](2)M(II)(H(2)O)(2)}(n)·pnH(2)O [dmbpy = 4,4'-dimethyl-2,2'-bipyridine; M = Mn (), Cu (), Ni () and Co () with p = 4 (), 3 (), 9 () and 3.5 ()] which were prepared by using the mononuclear PPh(4)[Fe(III)(dmbpy)(CN)(4)]·3H(2)O () building block (PPh(4)(+) = tetraphenylphosphonium) as a ligand toward fully solvated M(II) ions. The structure of consists of discrete [Fe(III)(dmbpy)(CN)(4)](-) anions, tetraphenylphosphonium cations and noncoordinated water molecules. Complexes are isostructural compounds whose structure consists of neutral 4,2-wave like heterobimetallic chains of formula {[Fe(III)(dmbpy)(CN)(4)](2)M(II)(H(2)O)(2)}(n) where the [Fe(III)(dmbpy)(CN)(4)](-) entity adopts a bis-monodentate coordination mode toward trans-[M(II)(H(2)O)(2)] units through two of its four cyanide groups in cis positions. exhibits the magnetic behaviour of magnetically isolated six-coordinate low-spin Fe(iii) complexes with an important orbital contribution. behaves as ferrimagnetic Fe(III)(2)Mn(II) chains, whereas exhibit intrachain ferromagnetic couplings between the low-spin Fe(iii) and either Cu(ii) (), Ni () or Co(ii) () as well as frequency-dependence of the out-of-phase ac susceptibility signals below 3.0 (), 5.5 () and 5.0 K (). The relaxation time and the energy to reverse the magnetization of 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, exhibits a double slow relaxation of the magnetization.
Luminita Marilena Toma; Jorge Pasán; Catalina Ruiz-Pérez; Francesc Lloret; Miguel Julve
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-2
Journal Detail:
Title:  Dalton transactions (Cambridge, England : 2003)     Volume:  -     ISSN:  1477-9234     ISO Abbreviation:  Dalton Trans     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-2     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101176026     Medline TA:  Dalton Trans     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Departament de Química Inorganìca/Instituto de Ciencia Molecular, Facultat de Química de la Universitat de València, Catedrático José Beltrán Martinez, n°2, 46980 Paterna, Valencia, Spain.
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