Synthesis, Crystal Structure and Magnetic Property of a Terbium Cluster.

In this paper, a new nonanuclear terbium cluster {Tb9 (L)4 (μ4-OH)2 (μ3-OH)8 (μ2-OCH3)4 (NO3)8 (H2O)8} (OH)·2H2O(1) was synthesized by 2,6-dimethoxyphenol (HL) and Tb(NO3)2·6H2O. The cluster was characterized via XRD, elemental analysis, infrared spectrum and thermogravimetric analysis. The magnetic property were also studied. X-ray single-crystal diffraction analysis indicates that the cluster is orthorhombic, the space group is I222, the crystal cell parameters are a = 1. 532 8 (3) nm, b = 1. 796 9 (4) nm, c = 1. 863 5 (4) nm, α = β = γ = 90°, V = 5. 132 6 (19) nm³. The nonanuclear skeleton formed by metal centers in the cluster that connected by μ4-OH and μ3-OH presents an interesting hourglass like topology. The central Tb ion has a slightly twisted tetragonal pyramid geometry, while the other Tb ions have a slightly deformed dodecahedral configuration. Magnetic investigations reveal that the weak antiferromagnetic interactions between adjacent metal ions exist in cluster 1, but no obvious slow magnetic relaxation behavior is shown due to the rapid magnetic quantum tunneling effect. [ABSTRACT FROM AUTHOR]