Cyanide-bridged FeIII-CuII complexes: Jahn-Teller isomerism and its influence on the magnetic properties

We report here the synthesis and characterization of four dinuclear cyanide-bridged FeIII-CuII complexes, based on a tetra- or a pentadentate bispidine ligand (L1 or L2, respectively; bispidines are 3,7-diazabiyclo[3.3.1]nonane derivatives) coordinated to the CuII center, and a tridentate bipyridine...

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Hauptverfasser: Atanasov, Mihail (VerfasserIn) , Comba, Peter (VerfasserIn) , Helmle, Stefan (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: August 20, 2012
In: Inorganic chemistry
Year: 2012, Jahrgang: 51, Heft: 17, Pages: 9357-9368
ISSN:1520-510X
DOI:10.1021/ic301122h
Online-Zugang:Verlag, Volltext: http://dx.doi.org/10.1021/ic301122h
Verlag, Volltext: https://doi.org/10.1021/ic301122h
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Verfasserangaben:Mihail Atanasov, Peter Comba, Stefan Helmle

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520 |a We report here the synthesis and characterization of four dinuclear cyanide-bridged FeIII-CuII complexes, based on a tetra- or a pentadentate bispidine ligand (L1 or L2, respectively; bispidines are 3,7-diazabiyclo[3.3.1]nonane derivatives) coordinated to the CuII center, and a tridentate bipyridineamide (bpca) coordinated to the low-spin FeIII site, with cyanide groups completing the two coordination spheres, one of them bridging between the two metal ions. The four structurally characterized complexes [{Fe(bpca)(CN)3}{Cu(L1·H2O)}]BF4, [{Fe(bpca)(CN)3}{Cu(L2)}][Fe(bpca)(CN)3]·5H2O, [{Fe(bpca)(CN)3}{Cu(L2·MeOH)}]PF6·MeOH·H2O, and [{Fe(bpca)(CN)3}{Cu(L2)}]PF6·2H2O belong to different structural isomers. The most important differences are structurally and electronically enforced (direction of the pseudo-Jahn-Teller mode) strong or weak interactions of the copper(II) center with the cyanide bridge. The related strength of the magnetic coupling of the two centers is analyzed with a combination of experimental magnetic, electron paramagnetic resonance (EPR), electronic spectroscopic data together with a ligand-field theory- and density functional theory (DFT)-based analysis. 
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