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Chapter 13 - Spectroscopy

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Term
Definition
spectroscopy   process of measuring the E differences btwn the possible states of a molecular system by determining the freq of electromagnetic radiation (light) absorbed by the molecules  
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IR spec   measures molecular vibrations (stretching, bending, rotation); must be a change in dipole moment so Br2 wouldnt show up  
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fingerprint region   1500-400cm  
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Alcohol absorption   3300cm  
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Carbonyl abs   1700cm  
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ethers abs   1100cm  
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spec used for   identification of functional groups  
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ketones abs   1700cm  
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acids abs   2900-3300cm broad  
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amines   sharp, 3100-3500cm  
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NMR Spec   nuclear magnetic resonance spectroscopy; nuclei placed in magnetic field and align either with or against the direction of the field  
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Alpha state   when it aligns with the field; low E  
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Beta state   when nuclei aligns against the field; high E  
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what is planted on x-axis for NMR   chemical shift in ppm  
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coupling/splitting on spectrum   when different protons are within 3 bonds of each other  
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doublet   two peaks of equal intensity equally spaced around true chemical shift  
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UV Spec   useful for compunds with double bonds and hetero atoms with lone pairs  
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Mass Spec   use an e- beam to ionize sample, accelerator to put the ions in flight and a magnetic field to deflect ions and detector counts the number of particles of each mass  
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whats on the x-axis for mass spec   mass/charge; m/q  
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