期刊
DALTON TRANSACTIONS
卷 44, 期 19, 页码 8846-8854出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5dt00512d
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资金
- National Center for Science (NCN) in Poland [DEC-2013/11/B/ST5/01058]
Novel heterometallic formate [(CH3)(2)NH2][(FeMgII)-Mg-III(HCOO)(6)] (DMFeMg) was prepared and characterized by single crystal X-ray diffraction, DSC, dielectric, magnetic susceptibility, Raman and IR methods. We also report thermal, Raman and IR studies of the known compound [(CH3)(2)NH2][(FeFeII)-Fe-III(HCOO)(6)] (DMFeFe). DMFeMg crystallizes in the niccolite structure (P (3) over bar 1c space group). In contrast to the known DMFeFe, [(CH3)(2)NH2][(FeMnII)-Mn-III(HCOO)(6)] (DMFeMn) and [(CH3)(2)NH2][(FeCoII)-Co-III(HCOO)(6)] (DMFeCo) formates, the metal ions in DMFeMg are distributed statistically over the two available octahedral sites. Temperaturedependent studies show that whereas DMFeFe exhibits an order-disorder phase transition at 151.8 K upon cooling, freezing-in of re-orientational motions of DMA(+) cations does not lead to any structural phase transition in DMFeMg. We discuss the origin of this difference. The low-temperature studies also show that DMFeMg orders magnetically at T-C = 13.5(5) K and the shape of M(T) measured in the field-cooling regime suggests ferromagnetic character of the ordering.
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