CHEM-2221 Lecture Notes - Lecture 13: Chemical Shift, Electromagnetic Radiation, Coupling Constant
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27 May 2016
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Electromagnetic radiation: electromagnetic radiation has properties of particles and waves, essential equations: Effect of the magnetic field: nuclei are positively charged and spin on an axis creating a small magnetic field. 1h and 13c are the most common nmr nuclei in organic chemistry: 99. 9% of hydrogen is 1h but only 1. 1% of carbon is 13c. Effect of the magnetic field: the external magnetic field b0 cause the two nuclear spin states to have different energies, the nuclear spin will either be aligned lower energy. Or opposed with the b0 higher energy: the difference in energy is small and dependent on b0. A n d - s t a t e s . P r o t o n s p in ( h i g h e r e n e e t w e e n. E = h x 3 0 0 m h z e = h x 5 0 0 m h z.
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