In acetylene, C-H stretch occurs about 3300 cm-1. Estimate the position of a C-T stretch.?
In acetylene, C-H stretch occurs about 3300 cm-1. Estimate the position of a C-T stretch. (T=tritium=^3H) (instead of figuring out the reduced masses, it is close enough to just use m for the lighter atom)
- Dr. ZorroLv 72 months agoBest Answer
From ω=√︎(k/μ) you see that you have to assess how μ changes from CH to CT.
1/μ = 1/M + 1/mH
1/μ = 1/M + 1/(3mH)
Therefore the ratio of frequencies becomes
r = ω=√︎(μT/μH) = ω=√︎3 approximately.
The wavenumber therefore decreases with a factor √︎3, to 1905 cm-1