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IR question - undergraduate chemistry?
Exam question:
A typical CH-stretching vibration occurs around 3000cm-1, an NH-stretch around 3350 and an OH around 3600. Explain this trend.
Originally thought that increased bond strength meant increased wavenumber, but this doesnt fit with the average bond strength values of CH (413 kJ/mol), NH (391 kJ/mol) and OH (463 kJ/mol)...
An explained answer would be really helpful!! Thank you
1 Answer
- ?Lv 68 years agoFavorite Answer
The wavenumber is related to the strength of the bond (k) and to the reduced mass of the bond (μ):
v = (1/2π)[k/μ]^1/2
thus the combination of the two will yield the corresponding wavenumber.
