Abstract
Abstract A Keggin-type polyoxomolybdate [H 2 biim]{Ni(biim) 3 (SiMo 12 O 40 )} [biim = 1 H ,1′ H -[2,2′]biimidazolyl] has been synthesized under hydrothermal condition and characterized by XRD, temperature-dependent IR, TG, temperature-induced and magnetism-induced 2D infrared correlation spectroscopy (2D-IR COS) and UV–vis DRS in order to explore the relationship between structure and properties. Temperature-induced 2D-IR COS spectroscopy indicates that the terminal Mo O μ / ν bonds are more sensitive than the bridging Mo O t bands to temperature variation, which is in agreement with the conclusion of temperature-dependent IR. Magnetism-dependent 2D-IR COS spectroscopy reveals the stretching vibration of the Mo O t occurs prior to the stretching vibration of the Mo O μ / ν , which is due to the coordination environment and the valence of the Si atom. The stability of compound 1 is investigated via TG and temperature-dependent IR. In RhB degradation, compound 1 shows good photocatalytic abilities.
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