Suppose that you are given a series of metal tricarbonyl compounds having the respective symmetries C_2v, D_3h, and C_s. Without consulting reference material, which of these should display the greatest number of CO stretching bands in the IR spectrum? Check your answer and give the number of expected bands for each by consulting Table 22.7.

Table 22.7.

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Complex Isomer Structure [M(CO)] [M(CO),L] [M(CO),L] trans [M(CO),L₂] cis [M(CO),L,] [M(CO), L] mer fac CO OC,, Co OC 8 8--8--8 oc,, OC co Co OC,, CO M OC | Co CO OC,, IL OC T CO L OC,, IL L CO CO OC,, IL OC | L CO Point group Ca Dah Number of bands* 1 3¹ 1 4+ 3* 2