NMR_Basic_Rules - Nuclear Magnetic Resonance Spectroscopy...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Nuclear Magnetic Resonance Spectroscopy (NMR) Spectrum represents the different interactions of stereochemically different protons ( 1 H) with the applied magnetic field. We will focus on 1 H NMR (proton, H + ) 4 general rules for 1 H NMR spectra 1. Only stereochemically different 1 Hs give different signals. 2. Area covered under the signal is proportional to the number of 1 Hs causing the signal and is usually represented by integrals. 3. The Chemical Shift (where on spectrum each peak appears) depends on the “chemical environment” of each proton. (see above picture) a. 1 Hs close to electronegative atoms (O, N, X (halogen)) or aromatics shift to the left (deshielded, downfield shifted) b. The larger the number of 1 Hs on the same carbon the more to the right (shielded, upfield shifted) the NMR signal is. CH 3 CH 2 -Cl Different H Different NMR signal CH 3 CH 2 CH 2 CH 3 Different H Different NMR signal Same H, symmetric Same H, symmetric Br Br 0 1 2 3 4 5 6 PPM 1 2 3
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4. The multiplicity of the NMR peak depends on the number of
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 3

NMR_Basic_Rules - Nuclear Magnetic Resonance Spectroscopy...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online