This is for Org Chem
I don't understand nothing. This is too difficult.
I am suppose to tell which is the organic compound that the chart represents by looking at all the waves and identifying all the separate groups that form the compound.
How do I do that?????
2006-12-10 11:09:55 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
the other answer is pretty correct. when i took O-chem, we had graphs to choose from that showed the absorbtion spikes of known compounds, and matched ours to the (hopefully) right one. if those aren't supplied i'm sure you can look them up.
i just googled it and found this great explanation in about 15 seconds:
http://wwwchem.csustan.edu/Tutorials/INFRARED.HTM
what is it those charts are showing? the compound in question is lit with IR light, the detector is in its "shadow". the dips in the graph are where the compound absorbed that wavelength, so less light got to the detector, so the line went down. everything absorbs different wavelengths in various amounts, so you can use this as sort-of a chemical-IR fingerprint.
2006-12-10 11:24:29 · answer #1 · answered by jiceberg 2 · 0⤊ 0⤋
When you're looking at IR spectra, they are really primarily only useful for one thing in an organic chemistry class (they are useful for other things in reality): telling whether a functional group is there or not. Since there are many many many peaks, people who look at IR spectra at first just try to identify things that stick out. As a big example, there is a stretch at 1700 cm^-1 for C=O groups. If you are given the IR spectrum of a compound that has a big peak at 1700 wavenumbers, you know it has a C=O. Similarly, some other common functional groups have very characteristic peaks, so you can identify very quickly whether or not the the functionalities are there. IR doesn't tell you too much about structure.
Think of a IR like a game of 20 questions. Does it have a tall neck, if yes, it's a giraffe. Does it have a trunk, if yes, it's an elephant. Does it have a big peak at 1700 wavenumbers, if yes then it has a C=O group. You're looking for characteristic features.
2006-12-10 11:35:00 · answer #2 · answered by Some Body 4 · 0⤊ 0⤋
Ir Spectroscopy Chart
2016-10-04 22:06:09 · answer #3 · answered by ? 4 · 0⤊ 0⤋
You need to know the spectrum for various compounds that you are looking for and see which ones match the best. The hard part is taking overlapping spectrum into account. I think there are programs to help with this.
2006-12-10 11:14:12 · answer #4 · answered by rscanner 6 · 0⤊ 0⤋