lec_4 - LEC FOUR - CONTINUED INTRODUCTION TO NMR IMPORTANT...

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LEC FOUR - CONTINUED INTRODUCTION TO NMR IMPORTANT GENERAL PRINCIPLES
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THE BIG FIVE! PLUS THREE MORE 1 H 99.98% (1.0) 13 C 1.1% (0.25) 15 N 0.4% (-0.1) 31 P 100% (0.41) 19 F 100% (0.94) 2 H 0.02% (0.31) 17 O 0.04% (-0.68) 11 B 80.4% (0.96)
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P36 ν = ( γ /2 π )B O (Larmor equation) 2.35T ALL 1 H ν = 100 MHz 11.75T --------- ν = 500 MHz
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P36 V O = ( γ /2 π )B O 11.75T ALL 1 H ν O = 500 MHz NOT TRUE!! WHAT ARE THE CHEM SHIFT MECHANISMS? LET’S WAIT FOR CHAPT 3!!!
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P29 1 H TWO APPROACHES
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P29 BEST APPROACH
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P29 WHY THE EXTRA SIGNALS?
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(90 0 ) x y x z B o FT THE DYNAMICS OF PFT
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PULSE ALONG X P35
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SEE P33 CASE WHERE V 0 = V 1 SMOOTH DECAY OF FID T 2 T 1 L.W. fcn T 2
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TWO INTERACTING NUCLEI MANY INTERACTING NUCLEI ONE INTERACTING NUCLEI SEE P33 FID - Free Induction Decay
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P37
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P37 SLOW --- T 1 NARROW LINES SLOW “R” OR LONGER --- T 2 LARGER T 2 FAST --- T 1 BROAD LINES FAST “R” OR SHORT --- T 2 SMALL --- T 2
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FAST ---- T 1 BROAD LINES FAST “R” OR SHORT --- T 2 SMALL --- T 2
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P46 FAST --- T 1 BROAD LINES FAST “R” OR SHORT --- T 2 SMALL --- T 2
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This note was uploaded on 08/06/2008 for the course CHEM 124 taught by Professor Amagata during the Winter '08 term at UCSB.

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lec_4 - LEC FOUR - CONTINUED INTRODUCTION TO NMR IMPORTANT...

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