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| Nuclear Magnetic Resonance (nmr) spectroscopy is an important part of any organic chemistry course. The 1H nmr spectrum of a compound comprises various peaks called absorption signals. Each unique proton of an organic molecule gives rise to a signal in the nmr spectrum of the molecule. This signal has certain characteristics associated with it.
Its size or integrated area is related to the number of protons that give rise to the signal. Note that when predicting the integration, the value of the integration is equal to the total number of protons giving rise to the signal. The signal's location in the spectrum (its chemical shift) is related to the environment the proton experiences. The signal appearance is also important. It can be split into a variety of peaks. This "splitting" is related to the number of neighboring protons and ultimately to the connectivity of the atoms in the molecule. |
Being able to predict these characteristics for a proton or set of equivalent protons is an important skill. This program tests your ability to predict the chemical shift, integration and splitting. The actual 1H nmr spectrum of the molecule can also be viewed after the prediction is made and the signal of interest will be highlighted.
The problems in the No Splitting category tests your ability to predict integration and chemical shift only and are all singlets. The other categories have protons with splitting and the splitting patterns become more complicated with each category. As you work through the problems in each category, they become more difficult and although each category has many problems if you do enough in one category the program will automatically give you problems from the next category. There are a variety of tools available to help you solve the problems as well as tutorials - please take advantage of these. Good luck and have fun! |