Lecture 9 - NMR Spectroscopy - Next week: NOTEBOOK CHECK -...

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Unformatted text preview: Next week: NOTEBOOK CHECK - Bring your lab notebook - Bring ALL GRADED LAB REPORTS Please note: If you are missing one or more graded lab - TAs will cross-check reports with notebooks reports for cross-checking purposes, the TAs will - TAs will assess the quality of your notebook "regrade" the carbons in your notebook to verify that - 15-points possible (no pre- or post-lab quiz) your score matches the score that we have recorded. - Most students do quite well on this - Most checks will be completed during lab - TAs may need a notebook for a longer period - In that event, prepare your pre-lab for next on loose-leaf, and staple into your book later. Next week: Spectroscopy Report to your assigned room as shown below: AB1 LH 106 (Mon, 1 PM) AB2 LH 106 (Tue, 8 AM) AB3 LIB 66 (Tue, 1 PM) AB4 GH 215 (Wed, 8 AM) AB5 MSEB 4101 (Wed, 1 PM) AB6 LH 196 (Thu, 8 AM) AB7 LH 192 (Thu, 1 PM) Please will not be able to take your mass, alsountil note: The week of November 10th mp You marksfollowingdate for your Take-Home the the the due week, so the due date for Assignment. You will receive this assignmentto Esterification lab report has been extended next week during your Spectroscopy lab. the week of November 10th. Next week: Spectroscopy Before next week: - Print out eight (8) copies of "Spec Data Table" - Bring these data tables to assigned room - Download and complete as best you can the "Spectroscopy Pre-Lab Assignment" (website) - No pre-lab/post-lab quizzes - No tutorials What type of information can we interpret from a typical proton-NMR spectrum? Solvent: (CDCl3) Peak at 7.26 ppm (CHCl3) What type of information can we interpret from a typical proton-NMR spectrum? (2) Integration relative number of H represented by each peak 14 mm 21 mm 7 mm 14 mm 42 mm 2 3 12 6 Relative # of protons/p eak What type of information can we interpret from a typical proton-NMR spectrum? (3) Multiplicity How many Hs are attached to neighboring Cs? doublet (d); n=1 nonet (non); n=8 singlet (s); n=0 triplet (t); n=2 quartet (q); n=3 What type of information can we interpret from a typical proton-NMR spectrum? (4) Coupling Constants (J values) distance between two adjacent lines within an NMR multiplet (in Hz); tells us which groups are next to each other in the molecule. J = 6.0 Hz Groups a and c are "coupled" to one another (adjacent to one another in our molecule). J = 6.0 Hz What type of information can we interpret from a typical proton-NMR spectrum? (5) Chemical Shift (in ppm) How shielded or deshielded is each set of H? 4.2 ppm 2.1 ppm 1.5 ppm 0.8 ppm 1.8 ppm What type of information can we interpret from a typical Carbon-NMR spectrum? We should observe one signal for EACH UNIQUE type of C in a molecule; deshielding/shielding trends apply. We will not utilize coupling information with C-NMR. ...
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This note was uploaded on 09/14/2009 for the course CHEM 233 taught by Professor Miller during the Winter '08 term at University of Illinois at Urbana–Champaign.

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