A complex with the formula (CO)5CrC5H7N was recently prepared. The handout distributed in class discusses a variety of characterization techniques typically used for organometallic compounds. The results of the more commonly used NMR and IR data are as follows.
IR -- In the carbonyl region there are stretches at 2057, 1980, and 1908 cm-1. The NMR spectra are as follows:
1H NMR chemical shift (relative intensity): 3.65 (3H), 3.89 (3H), 5.91 (1H)
13C NMR chemical shift (splitting): 47.97 (quartet), 49.71 (quartet), 84.16 (doublet),
116.1 (doublet), 216.98, 223.82, 248.85 (singlets)
What is the structure of the compound which is consistent with the 18-electron rule (for the transition metal) and the octet rule?