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Syntheses, crystal structures, and magnetic properties of two isostructural complexes (trenH4)2[CoX4]X6 (X = Cl, Br)

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Abstract

Two novel complexes (trenH4)2[CoCl4]Cl6 and (trenH4)2[CoBr4]Br6 (tren = tris(2-aminoethyl)amine) were isolated in the form of single crystals from the aqueous systems CoX2—tren—HX (X = Cl, Br). The chemical composition of formed complexes was corroborated by chemical analysis and IR spectroscopy. The crystal structures of isostructural compounds are ionic and are built up of tetrahedral anions [CoX4]2−, additional halogenido anions X−, and tetraprotonated (trenH4)4+ organic cations. The organic cations and complex anions are also connected beside ionic forces by hydrogen bonding interactions of the N–H···X type. The temperature variable magnetic studies (2–300 K) confirm the paramagnetic behavior of both complexes with zero-field splitting parameter D governing the magnetic behavior below 30 K. The fitting procedures yielded for D/hc values of +10.5 and +13.8 cm−1 for the chlorido and the bromido complex, respectively.

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Acknowledgments

We are thankful to grant agencies APVV-0014-11, VEGA 1/0075/13 and VVGS-PF-2013-91 for their financial support for this work. Partial support from ERDF EU project No. ITMS26220120005 is acknowledged.

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Authors and Affiliations

  1. Department of Inorganic Chemistry, Institute of Chemistry, Faculty of Sciences, P. J. Šafárik University in Košice, Košice, Slovakia

    Lukáš Smolko, Juraj Černák & Juraj Kuchár

  2. Department of Chemistry, FPV, University of SS Cyril and Methodius, 91701, Trnava, Slovakia

    Roman Boča

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  1. Lukáš Smolko
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  2. Juraj Černák
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  3. Juraj Kuchár
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  4. Roman Boča
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Correspondence to Juraj Černák.

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Smolko, L., Černák, J., Kuchár, J. et al. Syntheses, crystal structures, and magnetic properties of two isostructural complexes (trenH4)2[CoX4]X6 (X = Cl, Br). Monatsh Chem 146, 243–248 (2015). https://doi.org/10.1007/s00706-014-1332-4

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  • DOI: https://doi.org/10.1007/s00706-014-1332-4

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