Spectroscopy

[siba]

Do we have to memorize the specific number on the field and its corresponding structure in NMR, IR..?

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[DRHOYA]

Do we have to memorize the specific number on the field and its corresponding structure in NMR, IR..?

I would know main ones. For example in H-NMR, the aromatic protons on the ring usually show up around 7.....aldehydes are around 9-10...etc. For IR, I would also know main peaks such as OH's (3300-3500). C=O (1600-1700).....etc. Also for H-NMR, know that if you have protons that are not coupled and thus would exhibit a singlet, but if are within two bonds of a highly electronegative atom (halide, or oxygen)....then the peak will be shifted further downfield (away from zero). Deshielding is downfield (helpful hint). Hope that helps.

 

[siba]

Thank you so much!

 

[Dmitry Malayev]

Know the rule for n+1...triplet, doublet, singlet, etc...

Also i would know some of the major IR signals like the OH or the NH, NH2, COOH, etc... groups.