Chapter 17 Flashcards
Molecular ion peak
Clear peak at highest m/z value on right hand side of mass spectrum
What is the M+1 peak
Small peak one unit after M+ peak and exists because of the 1.1% of carbon present in carbon-13 isotope
What is fragmentation?
Where some molecular ions break down into smaller pieces known as fragments
What are fragment ions?
Other peaks in a mass spectrum formed from the breakdown of the molecular ion
Molecular ion breaks down into…
Fragment ion + radical
By absorbing IR radiation, bonds can…
Bend or stretch more
What is a stretch in bond
Rhythmic movement along the line between atoms so distance between the two atomic centres increases and decreases
What is a bend in bond
Change in bond angle
The amount that a bond stretches or bend depends on
Mass of atoms in bond - heavier atoms vibrate more slowly than lighter atoms
Strength of bond - stronger bonds vibrate faster than weaker bonds
Number of peaks below 1500cm-1 is called the…
Fingerprint region
What is elemental analysis
Use of percentage composition data to determine the empirical formula
What is mass spectrometry
Use of the molecular ion peak from a mass spectrum to determine the molecular mass; use of fragment ions to identify sections of a molecule
What is infrared spectrometry
Use of absorption peaks from an infrared spectrum to identify bonds and functional groups present in the molecule
