IR
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卡片预览 (21 张)
what is the peak for a hydrogen attached to a sp hybridized carbon (alkyne)
3300
what is the peak for a hydrogen bonded to an sp2 hybridized carbon
3100
what is the peak for a hydrogen bonded to an sp3 hybridized carbon
2900
if you increase the mass between two atoms on a covalent bond, will it vibrate faster or slower
faster
if you have a stronger bond, what happens to the frequency on IR
it is faster
why do sp hydrogens appear with more frequency than sp3
the bonds are shorter and held more closely to the nucleus so they vibrate more
where does a C-H bond appear
3032 cm
where does a C-O appear
1109 cm
where does a C=C appear
1682 cm-1
where does O-H appear
3500
what affects the intensity of a signal
the dipole moment, if there is a EN difference between the two bottom atoms, we see a strong signal
what indicates an OH group?
a broad signal
what indicates a carboxlyic acid
a slightly different braod signal
what type of signal do we see with a primary amine
2 signals, one for asymetric and one for symmetric
what does resonance do to the signal on a carbonyl
it lowers it
what do electronegative atoms do to a carbonyl
due to the inductive effect, electron density from the oxygen is pulled into the bond and to the electronegative group, this causes a higher signal to be observed
how many signals with acid anhydride
2, asymmetric and symmetric
when looking for C-H, N-H, or OH bonds, look to the left of 3000
where does a carbonyl appear
1700
where does aromatic appear
3030