Vibrational spectra of complexes of norbornadiene with transition metals Communication 2. Norbornadienetetracarbonyls of chromium and molybdenum
An analysis of the data of the IR and Raman spectra of norbornadiene tetracarbonyis of chromium and molybdenum shows that the C2v symmetry is the most probable for the fragment M(CO)4 and for the entire molecule of the complex as a whole.
The bands 224 and 249 cm−1 were assigned to the M-diolefin vibration [A1] in the spectra of C7HgMo(CO)4 and C7H8 Cr (CO)4, respectively. The vibrations of M-CO lie in the region of 400–450 cm−1.
The decrease in the intensity of the bands ρ=C-H in the IR spectra of olefins during complex formation is a characteristic consequence of the formation of a coordination bond.
In free olefins, the hydrogen atom in the =C-H bond is the positive end of the dipole.
The decrease in the frequencies vC s =C and C as =C during complex formation is ≈120 cm−1. The frequency Βs = C-H is unchanged during complex formation.
KeywordsHydrogen Chromium Molybdenum Hydrogen Atom Raman Spectrum
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