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| Form 1 (no H-bond) | Form 3 (weak H-bond) | Form 2 (strong H-bond) | Reference | ||||
| ν(Fe-C) | ν(CO) | ν(Fe-C) | ν(CO) | ν(Fe-C) | ν(CO) | ||
| C. aceNgb* | 489 (485) | 1965 (1918) | 522 (518) | 1934 (1888) | This work | ||
| D. mawNgb* | 489 (485) | 1965 (1918) | 522 (518) | 1934 (1888) | This work | ||
| Mouse | 492 | 1969 | 523 | 1933 | [42] | ||
| Human | 494 | 1972 | 505 | 1956 | 521 | 1932 | [43], [46] |
The frequencies obtained for the 13CO-adducts are given in parentheses.
