Chapter 13 - Spectroscopy
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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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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