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The homogeneous Ziegler–Natta catalyst is a coordination complex used in the polymerization of olefins. It consists of a transition metallocene, such as titanocene dichloride, and an organoaluminum compound, such as triethylaluminum. The titanocene dichloride provides the active site for the polymerization, while the triethylaluminum activates the olefin monomer. The two spectra that describe the identity of this catalyst are its UV-Vis spectrum and its IR spectrum. The UV-Vis spectrum shows a strong absorption band at around 350 nm, which is due to the d-d transition of the titanium(IV) ion. The IR spectrum shows a strong band at around 1600 cm-1, which is due to the C=C stretching vibration of the olefin monomer.