I'm hoping by some strange stroke of luck someone more knowledgeable than I is on here.
I'm trying to interpret an IR spectrum of Eugenol that I took today. I'm having trouble seeing which peak is the phenol (Carbon-Oxygen) stretch. It's supposed to be supposed to be 970-1250 (strong), but in that range there are a bunch of separate peaks. Do I just pick the strongest one or what?
Probably futile posting this on here, but I have to turn this in tomorrow morning. ARGH I hate this class!!
From my experience analyzing IR peaks for aromatic compounds is really difficult. The peak you are describing is right in the range of most other aromatic peaks. Choosing one will be really hard. I think it would be acceptable to point to that region of the spectra and say that it would be located in that range but due to other values occurring in the same region locating a specific peak is not possible without more information.I've never made an IR in lab that didn't have some contaminants and background noise so that is another problem. You correctly identified the peak ranges and that might be the best you can do. You might be able to get more accurate if you can determine which way the peak would shift based on the other pieces of the molecule but whatever. Basically I didn't give any specifics so I'm sorry if that was a waste of time. From my experience though it would be hard to pin pont it. Her eis a link to the spectra if anyone else wants a stab at it.
yeah, that's probably what I'll have to do. I think have all the other absorptions pinpointed to the right peaks, but like you said, when you do aromatics, it gets pretty messy, especially lower than like 1400/cm wavenumbers. I just don't have enough experience to really use the rest of the molecule to deduce which peak it should be. I could probably do that on an HNMR spectrum, but I really don't know anything about IR spectra...they just made us do this lab without even explaining anything about it.
The problem is that the compound's ir band you're looking for is in the fingerprint region, 800-1400, and in there its really hard to find a single band of absorption. I would look at the already established ir spectrum of whatever you want and then just compare the two to see if you're right.
You could get mad dollar peddling the street with that kind of purity.
And the sign said long-haired freaky people need not apply,
So I tucked my hair up under my hat
And I went in to ask him why,
He said, "You look like a fine upstandin' young lad.
I think you'll do",
So I took off my hat and said, "Imagine that,
huh , me workin' for you."