310-2 - Organic Lecture Series CH 310 N LECTURE 2 Textbook...

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Organic Lecture Series 1 CH 310 N LECTURE 2 Textbook Assignment: Chapter 13 (NMR) Homework (for credit): POW 1 posted (Due Jan 31) Today’s Topics: NMR-introduction & theory Notice & Announcements: Office Hrs- JAC-Mon & Wed: 2-4 pm WEL 1.316 Organic Lecture Series 2 OH H 2 SO 4 Major + Minor Reactions will often give a mixture of products: How would the chemist determine which product was formed? How would the chemist determine which product was formed? Both are Both are cyclopentenes cyclopentenes ; they are isomers. ; they are isomers. Spectroscopy will provide the solution. Spectroscopy will provide the solution.
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Organic Lecture Series 3 Molecular and atomic transitions occur & are frequency dependent. Organic Lecture Series 4 N N uclear uclear M M agnetic agnetic R R esonance esonance Chapter 13 Chapter 13
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Organic Lecture Series 5 Molecular Spectroscopy Molecular Spectroscopy Nuclear magnetic resonance (NMR) Nuclear magnetic resonance (NMR) spectroscopy spectroscopy : a spectroscopic technique that gives us information about the number and types of atoms in a molecule, for example, about the number and types of – hydrogen atoms using 1 H-NMR spectroscopy – carbon atoms using 13 C-NMR spectroscopy – phosphorus atoms using 31 P-NMR spectroscopy Organic Lecture Series 6 • An electron has a spin quantum number of 1/2 with allowed values of +1/2 and -1/2 – this spinning charge creates an associated magnetic field – in effect, an electron behaves as if it is a tiny bar magnet and has what is called a magnetic moment • The same effect holds for certain atomic nuclei – any atomic nucleus that has an odd mass number, an odd atomic number, or both also has a spin and a resulting nuclear magnetic moment – the allowed nuclear spin states are determined by the spin quantum number, I , of the nucleus Nuclear Spin States Nuclear Spin States
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Organic Lecture Series 7 Nuclear Spin States Nuclear Spin States – a nucleus with spin quantum number I has 2 I + 1 spin states; if I = 1/2, there are two allowed spin states – Table 13.1 gives the spin quantum numbers and
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310-2 - Organic Lecture Series CH 310 N LECTURE 2 Textbook...

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