CHEM 2444 Chapter Notes - Chapter 14A: Nuclear Magnetic Resonance Spectroscopy, Radical Ion, Chemical Formula
Document Summary
Infrared spectroscopy (ir) determine the functional group (stretches bonds; we can observe the vibration from the stretching to determine which functional group(s) is in the molecule: ether, alcohol, aldehyde, carbonyl. Nuclear magnetic resonance spectroscopy (nmr) establish molecular connectivity (same technique as mri: magnetic resonance imaging: hydrogen count based on formula, what the hydrogen"s neighbors" are (what is connected to the hydrogens) Red light is lower in energy than violet light. Creates a high-energy, unstable molecule that will fragment (knocks electron out to form a charged radical: radical cation. Sigma or pi electrons can be knocked off to create the radical: written with a bracket to indicate that we don"t know where the electron comes off of the molecule, molecule tends to break along known chemical bonds. Fragments are called daughter ions: parent ions are called molecular ions, daughter ion = molecular ion 1 electron.
