Journal
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Volume -, Issue 25, Pages 3713-3720Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.200900329
Keywords
Nickel; Chain structures; Metal-organic frameworks; Magnetic properties
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Funding
- Agence Nationale de la Recherche [ANR-06-JCJC-0008]
- French Ministry for Education, Research and Technology
- Agence Nationale de la Recherche (ANR) [ANR-06-JCJC-0008] Funding Source: Agence Nationale de la Recherche (ANR)
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The new carboxylato-bridged Ni-II network {Ni-3(mu(3)-OH)(2)-[(kappa(1)-kappa(1))-(kappa(1)-kappa(1))-mu(4)tdc](2)(H2O)4}(n) (H(2)tdc = 2,5-thiophenedicarboxylic acid) has been synthesized hydrothermally. The structure has been characterized by synchrotron powder X-ray diffraction, thermogravimetric analysis, IR and UV/Vis spectroscopy. The title compound consists of [Ni1O(6)](2)[Ni2O(6)] chains built of two edge-sharing octahedrons Ni1O(6) linked via mu(3)-OH to a vertex of the Ni2 octahedron. The connection between the chains is settled by the tdc(2-) anions, leading to a 3D framework. The title compound exhibits a metamagnetic transition (T-N = 3.0 K, mu H-0(C) = 0.13 T at 1.8 K). This behaviour results from chains of ferromagnetic dimers coupled antiferromagnetically with intermediate Ni2, the competing set of interactions leading to a resultant moment. At low temperature, a 3D antiferromagnetic ordering occurs between the chains. The magnetic Ni-Ni interactions were evaluated by numerical resolution of the corresponding spin Hamiltonian. The structural and magnetic proper-ties were compared with those of compounds exhibiting similar structural features and based on fumarate (fum(2-)), tereplithalate (tp(2-)) and 1,4-cyclohexanedicarboxylate (chdc(2-)). ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)
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