Organic analysis Flashcards
Infared spectroscopy
Can be used to identify functional groups. A pair of atoms bonded together are constantly vibrating. Every differnt type of bond has its own natural frequencywhich falls within the infared region.
Infared energy is absorbed by bonds which make the bonds vibrate. The bonds vibrate at tge same frequency as the infra red energy.
O-H bond in alcohols
look ike test tubes
Fingerprint region
The fingerprint region is the area of the spectrum 1500cm-1 and below
How can mass spectrometry be used to confurm that a compound is defintely …
compare with a known spectrum from a data base, it should be the exact match.
Which factors does the mass spectrometry measure
massto charge ratio and relative abundance
key facts of molecular ion peaks
peak with largest m/z ratio is caled the molecular ion peak and is equal to the mr of the molecule
Why can’t a mass spectrometer which measures m/z ratios to 1 decimal place tell the difference between C10H16O4 and C11H4O4?
They have the same molecular mass to 1 decimal place
Why can’t high resolution mass spectrometry tell the difference between propan-1-ol and propan-2-ol?
They have the same molecular formula, so their molecular mass will be exactly the same.
Why does C have a relative molecular mass of 12.00000?
12C is a standard reference
