L1 /
9
CH1012
UV / VIS
Ultraviolet/Visible
UV/Vis (l = 200 - 800
nm)
• UV / Vis absorption is due to an electronic excitation from:
low E orbital ® high E orbital
low E orbital ® high E orbital
UV absorption is most pronounced in conjugated multiple-bond systems ie. ones with alternating double – single bonds.
• The absorption
corresponds to
a change in Eelectronic in the molecule.
a change in Eelectronic in the molecule.
