Synthesis, structures, and magnetic properties of a cubane-type cluster [Ni(hmp)(MeOH)Br]4 · 2H2O (hmp−= anion of 2-hydroxymethylpyridine)

Autor:	Qing-Jin Meng, Yang-Mei Liu, Fang-Ming Wang, Changsheng Lu, Jian-Guo Lin, Yan-Yan Xing
Rok vydání:	2010
Předmět:	Crystallography Thermogravimetric analysis Ferromagnetism Octahedron Chemistry Materials Chemistry Molecule Crystal structure Physical and Theoretical Chemistry Zero field splitting Ground state Single crystal
Zdroj:	Journal of Coordination Chemistry. 63:3431-3440
ISSN:	1029-0389 0095-8972
DOI:	10.1080/00958972.2010.514048
Popis:	[Ni(hmp)(MeOH)Br]4 ⋅ 2H2O has been prepared by the reaction of 2-hydroxymethylpyridine with NiBr2 ⋅ 3H2O and characterized by IR, elemental analysis, powder X-ray diffraction, thermogravimetric analyses, magnetic measurements, and single crystal X-ray diffraction. The crystal structure shows two independent [Ni(hmp)(MeOH)Br]4 molecules in the asymmetric unit and [Ni4O4]4+ cubane-type cores. Each octahedral Ni(II) is bridged by four μ3-CH2O − fragments from four hmp − ligands. Magnetic studies show that ferromagnetic coupling gives an S = 4 ground state with significant magnetoanisotropy, and the parameters are J 1 = 8.56, J 2 = 2.28, D = −0.65 cm−1, and g ≈ 2.13.
Databáze:	OpenAIRE
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