Journal article
Ferromagnetic coupling in a 1D coordination polymer containing a symmetric [Cu(mu1,1-N3)2Cu(mu1,1-N3)2Cu]2+ core and based on an organic ligand obtained from the solid state
Inorganic chemistry, Vol.46(21), pp.8843-8850
10/15/2007
DOI: 10.1021/ic070018b
PMID: 17867673
Abstract
Addition of rctt-tetrakis(2-pyridyl)cyclobutane (2,2'-tpcb) in a Cu(II)/N(3)- solution afforded the 1D coordination polymer [Cu(3)(N(3))(6)(2,2'-tpcb)(DMF)(2)](n) (1). The ligand 2,2'-tpcb serves as a tetradentate bis-chelating ligand by linking linear [(DMF)Cu(mu(1,1)-N(3))(2)Cu(N(3))(2)(mu(1,1)-N(3))(2)Cu(DMF)] trinuclear units to produce a zigzag chain. Within each centrosymmetric trinuclear unit there exist two irregularly asymmetric end-on double azido-bridged [Cu(mu(1,1)-N(3))(2)Cu](2+) cores, while one of the largest Cu-Nazide-Cu angles is observed. Magnetic susceptibility data, measured from 2 to 300 K, show bulk moderate ferromagnetic coupling within the magnetically isolated trinuclear units. These data were fitted to the appropriate equation derived from the Hamiltonian H = -J(1)(S(A1)S(B) + S(A2)S(B)) - J(2)S(A1)S(A2), giving the parameters J1 = +70(3) cm(-1), J2 = -3(2) cm(-1), g = 2.12(1), with an intertrimer interaction parameter theta = -0.74(2) K. The coupling constants were correlated with the structural parameters. Density functional calculations reproduce very well the experimental J values and show that ferromagnetism for this complex is mainly due to the topology of the magnetic orbitals and the different coordination spheres of two neighboring Cu(II) atoms, resulting in a small overlap of the orbitals possessing the unpaired electrons.
Details
- Title: Subtitle
- Ferromagnetic coupling in a 1D coordination polymer containing a symmetric [Cu(mu1,1-N3)2Cu(mu1,1-N3)2Cu]2+ core and based on an organic ligand obtained from the solid state
- Creators
- Theocharis C Stamatatos - Department of Chemistry, University of Patras, 26504 Patras, GreeceGiannis S PapaefstathiouLeonard R MacGillivrayAlbert EscuerRamon VicenteEliseo RuizSpyros P Perlepes
- Resource Type
- Journal article
- Publication Details
- Inorganic chemistry, Vol.46(21), pp.8843-8850
- DOI
- 10.1021/ic070018b
- PMID
- 17867673
- ISSN
- 0020-1669
- eISSN
- 1520-510X
- Language
- English
- Date published
- 10/15/2007
- Academic Unit
- Pharmaceutical Sciences and Experimental Therapeutics; Chemistry
- Record Identifier
- 9984216590902771
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