Question

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1. Vibrational spectroscopy: Bond-stretching vibrations. Sadly, labels have fallen off of two vials containing manganese(I) carbonyl coordination complexes. Thus, a chemist is unsure which vial contains [Mn(CO)sCl] and which contains the sodium salt of trans-[Mn(CO)4C2]. Not easily deterred the chemist acquires an IR spectrum of the contents of one of the vials. Below are the structures of the two possible complexes (left) and the CO-stretching region of the IR spectrum (right) [Mn(Co),CI] trans-[Mn(Co).CIJ10 Cl CI CI 2200 2150 2100 2050 2000 1950 Wavenumber (cm-1) Perform the following steps to determine for which complex, [Mn(CO)sCl] or trans-[Mn(CO)4C2], the IR spectrum was acquired a. Determine the point group of each complex b. For each compler, determine a reducible representation describing the symmetry of a set of c. For each complex, factor the reducible representation into a linear combination of irreducible d. For each complex, determine which irreducible representation(s) correspond to IR-active e. On the basis of your answers to parts a-d, for which complex was the IR spectrum obtained? vectors aligned along the CO bonds. Only one vector per carhonyl group is required here! representations, each of which represents one or more C-O stretching vibrational modes vibrational modes Briefly explain your reasoning

Answer 1