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Crystal growth, thermal and magnetic characterizations of a new ferromagnetic Ni(II) dimer

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Abstract

Single crystals of 1-methylpiperazine-1,4-diium hexaaquatetrachlorodinickel(II) dichloride, (C5H14N2)[Ni2Cl4(H2O)6]Cl2, were grown by hydrothermal techniques in aqueous solution. The compound was characterised by differential thermal analysis (TG-TDXD), single crystal X-ray diffraction, and variable temperature magnetic susceptibility. The compound crystallizes in the triclinic system (space group P-1, Z = 2) with the following unit cell dimensions: a = 6.611(3) Å, b = 8.776(4) Å, c = 17.457(8) Å, α = 101.34(2)°, β = 96.31(2)°, and γ = 105.38(2)°. The structure was solved using 4,243 independent reflections and refined to R = 0.024. The structure of (C5H14N2)[Ni2Cl4(H2O)6]Cl2 can be described as mixed organic–inorganic layers along the [−101] direction. The Ni dimers show ferromagnetic exchange (J ~ 15 K), while the interactions between the dimers are antiferromagnetic (J ~ −3 K). The 3D network is further linked by three types of hydrogen bonds (N–H···Cl, OW–H···Cl, and N–H···O), in order to build cation–anion cohesion. Dehydration of the precursor proceeds through three stages, leading to crystalline intermediary hydrate phases and an anhydrous compound.

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Acknowledgments

We are grateful to Dr. Thierry Roisnel (Centre de Diffractométrie X, Sciences Chimiques de Rennes, Université de Rennes I) for supplying the powder X-ray diffraction data collection.

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Authors and Affiliations

  1. Laboratoire physico-chimie de l’Etat Solide, Département de Chimie, Faculté des Sciences de Sfax, BP1171, 3000, Sfax, Tunisia

    Assila Maâtar Ben Salah, Sondra Walha, Samia Yahyaoui, Tahar Mhiri & Houcine Naïli

  2. Carlson School of Chemistry and Biochemistry, Clark University, Worcester, MA, 01610, USA

    Mahmoud Abdalrahman & Mark M. Turnbull

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  1. Assila Maâtar Ben Salah
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  2. Sondra Walha
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  3. Samia Yahyaoui
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  4. Mahmoud Abdalrahman
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  5. Mark M. Turnbull
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  6. Tahar Mhiri
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  7. Houcine Naïli
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Correspondence to Houcine Naïli.

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Ben Salah, A.M., Walha, S., Yahyaoui, S. et al. Crystal growth, thermal and magnetic characterizations of a new ferromagnetic Ni(II) dimer. Monatsh Chem 145, 1575–1581 (2014). https://doi.org/10.1007/s00706-014-1230-9

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  • DOI: https://doi.org/10.1007/s00706-014-1230-9

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