Organic Chemistry, 5th Edition i L.G. Wade. jr Chapter 13 Nuclear Magnetic Resonance Spectroscopy Jo blackburn Richland college, dallas TX Dallas County Community College District c 2003. Prentice hall
Chapter 13 Nuclear Magnetic Resonance Spectroscopy Jo Blackburn Richland College, Dallas, TX Dallas County Community College District © 2003, Prentice Hall Organic Chemistry, 5th Edition L. G. Wade, Jr
ntroduction NMR is the most powerful tool available for organic structure determination It is used to study a wide variety of nuclei 13 19 CNF > Chapter 13
Chapter 13 2 Introduction • NMR is the most powerful tool available for organic structure determination. • It is used to study a wide variety of nuclei: ➢1H ➢13C ➢15N ➢19F ➢31P =>
Nuclear Spin anucleus with an odd atomic number or an odd mass number has a nuclear spin The spinning charged nucleus generates a magnetic field B B B B B B B B (current) inning proton loop of current bar magnet Chapter 13
Chapter 13 3 Nuclear Spin • A nucleus with an odd atomic number or an odd mass number has a nuclear spin. • The spinning charged nucleus generates a magnetic field. =>
External Magnetic Fields When placed in an external field, spinning protons act like bar magnets S S twist lower energy higher energy more stable less stable Chapter 13
Chapter 13 4 External Magnetic Field When placed in an external field, spinning protons act like bar magnets. =>
TWo Energy States The magnetic fields of the spinning nuclei will align either with Dβ state the external field or against the field v=△E A photon with the right amount of energy can be absorbed a state and cause the spinning proton to > Chapter 13
Chapter 13 5 Two Energy States The magnetic fields of the spinning nuclei will align either with the external field, or against the field. A photon with the right amount of energy can be absorbed and cause the spinning proton to flip. =>