lecture 4 sp 09 given - Lecture 4 L t Chemistry 310N...

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Lecture 4 Chemistry 310N Organic Chemistry II for Prehealth Professionals Unique number: 53185 Tu,Th 12:30-2:00 pm, Welch 2.224 rofessor: Jonathan Sessler Ph D Professor: Jonathan Sessler, Ph.D. sessler@mail.utexas.edu Notes: Homework I due today. Homework II will be a “stretch” (i.e. ahead of lecture) Office hours today will start at 3:35 pm 13 C NMR spectroscopy, although in the book, will not be on Exam I
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MR Spectroscopy NMR Spectroscopy QuickTime?and a TIFF (LZW) decompressor are needed to see this picture. As with IR spectroscopy, I’ll focus first on theory, but in the end it is mostly a working, practical knowledge that is important. So, don’t panic if most f what comes next is hard and confusing; it is mostly background. of what comes next is hard and confusing; it is mostly background. Start working Homework II (which leads the lecture a bit) and the problems in the book (harder and more typical of the exam).
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olecular Spectroscopy Molecular Spectroscopy Nuclear magnetic resonance (NMR) spectroscopy : A spectroscopic technique that gives us information about e number and types of atoms in a molecule for the number and types of atoms in a molecule, for example, about the number and types of ydrogen atoms using 1 - MR spectroscopy hydrogen atoms using H NMR spectroscopy. – carbon atoms using 13 C-NMR spectroscopy. hosphorus atoms using 31 MR spectroscopy – phosphorus atoms using P-NMR spectroscopy. ot all isotopes can be detected 12 is not detectable Not all isotopes can be detected… C is not detectable, for example Must have a certain nuclear “spin” property to work
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Spin States lectrons have a spin quantum number • Electrons have a spin quantum number of 1/2 with allowed values of +1/2 and - 1/2 – this spinning charge creates an associated magnetic field – electrons have what is called a magnetic moment and they behave as if they were a were a tiny bar magnet Remember the Pauli exclusion principle? Spin “up” and spin “down”
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Nuclear Spin States • Nuclei with an odd mass, an odd atomic number, or both also have a net spin and a resulting nuclear magnetic moment. • The allowed nuclear spin states are determined by the spin quantum number, I , of the nucleus. • For each I there are 2 I + 1 spin states •I f I = 1/2, there are two allowed spin states Note: Because of uncertainty principle, inning electrons, nuclei spinning electrons, nuclei actually rotate like tops. This is called precession.
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What is Spin Anyhow?? • A fundamental property of nature like electrical charge or mass. pin comes in multiples (quanta) of 1/2 Spin comes in multiples (quanta) of 1/2 – Protons, electrons, and neutrons all possess spin. –Individual unpaired electrons, protons, and neutrons each possesses a spin of 1/2.
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This note was uploaded on 06/15/2009 for the course CH 53185 taught by Professor Sessler during the Spring '09 term at University of Texas at Austin.

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lecture 4 sp 09 given - Lecture 4 L t Chemistry 310N...

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