Abstract
Two isomeric forms of the octamolybdate cluster, (NH 4) 2(Hbpy) 2[Mo 8O 26](bpy) 3 1 (bpy=bipydine), and [Cu 2(imi) 4] 2[Mo 8O 26] 2 (imi=imidazole), were synthesized by hydrothermal method and characterized by X-ray single analysis, one-dimensional (1D) infrared spectroscopy and two-dimensional (2D) correlation infrared spectroscopy under thermal perturbation. In compound 1, the [Mo 8O 26] units are β-structure, and octamolybdate anion is ζ-structure in compound 2. The 2D IR correlation spectroscopy study indicates that the intensity changes of Mo O band are more sensitive to the temperature variation than that of the Mo–O bond. The μ-Mo–O bond and framework vibrations in compound 1 are more sensitive to the temperature variation than that for compound 2. As the vibrations of μ-Mo–O bond accompanied by the transfer of an oxygen atom, the catalysis ability of compound 1 may be higher than that of compound 2.
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