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OAT Orgo

Chapter 13 - Spectroscopy

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
IR spec measures molecular vibrations (stretching, bending, rotation); must be a change in dipole moment so Br2 wouldnt show up
fingerprint region 1500-400cm
Alcohol absorption 3300cm
Carbonyl abs 1700cm
ethers abs 1100cm
spec used for identification of functional groups
ketones abs 1700cm
acids abs 2900-3300cm broad
amines sharp, 3100-3500cm
NMR Spec nuclear magnetic resonance spectroscopy; nuclei placed in magnetic field and align either with or against the direction of the field
Alpha state when it aligns with the field; low E
Beta state when nuclei aligns against the field; high E
what is planted on x-axis for NMR chemical shift in ppm
coupling/splitting on spectrum when different protons are within 3 bonds of each other
doublet two peaks of equal intensity equally spaced around true chemical shift
UV Spec useful for compunds with double bonds and hetero atoms with lone pairs
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
whats on the x-axis for mass spec mass/charge; m/q
Created by: JaeBae4444