We will discuss the principles of chemical shift in more detail but for now, let’s also mention the other key features of NMR. The signals in 1H NMR are originated from energy absorption and release of protons which are exposed to the energy to a different extent depending on their neighboring atoms. Keep in mind that all the information we get about the functional groups is solely based on the protons that are in those functional groups – it is a proton 1H NMR (we also have 13C and some other nuclei NMRs). Most often the signal area for organic compounds ranges from 0-12 ppm. The energy axis is called a δ (delta) axis and the units are given in part per million (ppm). Here are the main regions in the 1H NMR spectrum that you need to know: You want to know what functional groups/fragments you have – check the region where the peaks appear. Most of the time this is going to be the first thing you look at when analyzing an NMR spectrum. Just like the IR spectroscopy, different functional groups have different energy values for resonance absorption and that’s what helps us identify them. This is what we see on the x axis and it tells the energy value at which the peak appears. Let’s now briefly explain what each of these represents. We will rather try to figure out what and where do you look for and how you understand it when analyzing an NMR spectrum?īelow is the summary of the four main pieces of information we obtain when looking at an 1H NMR spectrum. In this post, we won’t go into the details of how the NMR spectroscopy works and the physics behind it. There is, however, a lot more information you can get from an NMR spectrum than what we have seen in the IR spectroscopy and Mass Spectrometry.
In a broad sense, it still works by the same principle as other spectroscopies, and that is the interaction of the molecule with certain type of energy to produce different energy states and deduce information based on these differences.
NMR spectroscopy is the most common and comprehensive technique for studying the structure of organic molecules.
0 kommentar(er)
