A Three-Dimensional Ferromagnet, [Ni(dipn)]<sub>3</sub>[Cr(CN)<sub>6</sub>]<sub>2</sub>·3H<sub>2</sub>O (dipn = dipropylene triamine), Based on a Cubic Cr<sub>8</sub>Ni<sub>12</sub> Unit
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The combination of Ni2+, dipropylenetriamine (dipn), and [Cr(CN)6]3- affords the cyanide-bridged bimetallic assembly, [Ni(dipn)]3[Cr(CN)6]2·3H2O (1). This compound crystallizes in cubic space group Pa3̄, with a = b = c = 20.9742(7) Å and Z = 8. A three-dimensional network is constructed on the basis of a Cr8Ni12 cubane unit formed by an alternate array of [Cr(CN)6]3- and [Ni(dipn)]2+ units through Cr−CN−Ni−NC−Cr edges. Cryomagnetic studies reveal a ferromagnetic interaction between CrIII and NiII ions and a long-range ferromagnetic ordering below 42 K with very small coercive field. To the best of our knowledge, this compound is the first “complete ferromagnet” providing three-dimensional ferromagnetic interaction through a three-dimensional bridging structure that is based on a cubic unit among general metal-oxide and molecule-based magnets. Magnetooptical studies demonstrate a strong correlation between magnetic and optical properties.
