CHEM 344 Chapter Notes - Chapter Lab 1: Radical Ion, Computational Chemistry, Catskill High Peaks
8 Sep 2016
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Reaction progress can be monitored by looking for the disappearance or appearance of spectral features associated with changes to functional groups: some probes allow viewing of reaction progress in real-time, which gives it advantages over impact-type experiments. When n2 is lost in a diazo-compound, it produces a carbene (most of the time) Ir is useful when observing highly reactive hydrocarbon compounds that need to be cooled and surrounded by an inert matrix in order to avoid further reactions. Much of the spectra at less than 1500 wavenumbers can be ignored, but can be assigned with deeper analysis using computational chemistry. Electron impact mass spectrometry (ei-ms: good for getting mass of a molecule and connectivity of the atoms, the technique is highly sensitive and destructive. The molecule is ionized by a 70 ev beam of electrons, forming radical cations and breaking the molecule. Ions are controlled by a magnetic field, mass selected, and detected at an ion collector.
