Structure Determination Flashcards
Which peak corresponds to the molecular ion?
The peak furthest to the right
What does the x axis of a mass spectrum graph represent?
It effectively represents the relative mass of the fragment
What causes the small peaks to the right of the molecular ion?
Other isotopes of the molecular ion
What happens when a molecular ion fragments?
One fragment carries a positive charge and the other an unpaired electron. Only the charged fragment is detected
Where are molecular ion fragments more likely to take place?
At the weaker bonds
What does abundance of the fragment relate to?
The stability of the fragment formed
What do the different peaks in IR spectroscopy relate to?
Different functional groups that are part of the molecule.
What is the fingerprint region in IR spectroscopy?
The region on the right side of the graph with a wavelength number of less than 1500cm^-1
What do the different peaks in Cnmr represent?
The different carbon environments
What do the peaks in proton NMR represent?
The different hydrogen environments
What does the height of each peak represent in proton nmr
The height of the peak represents the number of hydrogens on that particular carbon
What does the splitting on each peak in proton nmr represent?
The splitting represents the amount of hydrogens on the adjacent carbon, so if the peak is split 3 times to create 4 peaks the adjacent carbon to that one has 3 hydrogens on it
How does chromatography work?
It works on the principle that a mixture can be separated if it is dissolved in a solvent and then the resulting solution moves over a solid.
What is the mobile phase in chromatography?
The mobile phase is the resultant solution which carries the soluble components with it. The more soluble the components the faster it moves
What is the stationary phase in chromatography?
The stationary phase will hold back the components in the mixture that are attracted to it. The more affinity a component has for the stationary phase the slower it moves with the solvent.
