Answer to Question #99276 in Inorganic Chemistry for joeh

Question

Infrared spectral analysis of the following three complexes showed a set of two IR bands for the νCO stretching frequencies of 1956 & 1875 cm-1; 1930 & 1850 cm-1; and 1979 & 1897 cm-1. Match the correct set of IR bands to the given compounds and justify your reason.

(a) (η5 -C5H5)2 Ti (CO)2
(b) (η5 -C5(CH3)5) (η5 -C5H5) Ti (CO)2
(c) η5 - C5(CH3)5)2Ti(CO)2

Answer 1

According to the functional groups:

(a) (η5 -C5H5)2 Ti (CO)2 - 1979 & 1897 cm-1

(b) (η5 -C5(CH3)5) (η5 -C5H5) Ti (CO)2 - 1956 & 1875 cm-1

(c) η5 - C5(CH3)5)2Ti(CO)2 - 1930 & 1850 cm-1