A New Heterometallic 3d-3d Transition Metal Oxo-cluster {Cu6IIMnIII}: Synthesis, Crystal Structure and Magnetic Property

A new transition metal-antimony oxo-cluster based compound has been synthesized in water under room temperature. Its formula is Na-6[Cu6MnSb6(mu(3)-OH)(2)(OH)(mu(4)-O)(6)(tartrate)(6)]center dot 20H(2)O (1), where tartrate represents rac-tartaric acid. It was characterized by elemental analysis, infrared spectrum and X-ray single-crystal diffraction. The compound crystallizes in the monoclinic system, space group P2(1)/n. Structural analyses revealed that two Sb-3(mu(3)-O)(tartrate)(3) scaffolds sandwich a (Cu6MnIII)-Mn-II middle layer to form the cluster. In the middle layer, all the seven metal ions lie in an almost regular hexagon, with Mn-III ion in the center and six Cu-II ions along the edges of the hexagon. As a 4-connected node, each cluster is interlinked to its nearest four {Cu6Mn} neighbors through Na+, generating a 3D supramolecular framework. The temperature-dependent magnetic susceptibilities indicated dominating antiferromagnetic interactions in 1 with J(Cu-Cu) = 176.34 and J(Cu-Mn) = -14.44 cm(-1).

Automated summary

A new transition metal-antimony oxo-cluster based compound has been synthesized in water at room temperature, with a complex structure. Analysis revealed strong antiferromagnetic interactions in the compound, indicating unique magnetic properties.