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ochem recitation
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Spectroscopy
measurement of the interaction between electromagentic raidation (ie. light) with a molecule
spectroscopy can have three outcomes
absorbtion
reflection
scattering
absorbtion
energy of photon brings the molecule to some higher E or excited state
reflection
beam of light comes back with same energy started with
scattering
photon has a change in direction and or Energy
Radio waves
affect nuclear spin state
100m-0.1cm
infared light
near and far
100nm
effects molecular vibrational states
visible light
400nm
electonic excitation
U.V light
400nm-10 nm
electronic excitation...same as visible light
Xrays
nuclear diffracted (scattered)
10nm-.01nm
Gamma waves
'DEATH'
<0.001nm
waves towards radio side have what characteristics
F.E.W
Low Freq
Low Energy
High Wavelength
waves towards gammam side have what characteristics
F.E.W
high freq
hgih Energy
low wavelengths
natural frequency
Frequency at which a bond vibrates naturally
A bond will absorb a photon that...
occurs at its natural frequency
Bonds act like...
Springs
Degrees of unsaturation (missing Hs)
elements
CnH2n+2
N...add 1
O...no change
X (cl,Br,I)...subtract 1
Degrees of unsaturation equation
saturated Hs-actual Hs/2
C4H8
CnH2n+2......10-8/2= 1 (can be a ring or pi bond)
" '' ......10-6/2=2 (can be 2 rings or 2 pi bonds
When there is NO dipole change...
the molecule is NOT Infered (IR) active
Author
Anonymous
ID
72861
Card Set
ochem recitation
Description
ochem recitation
Updated
2011-03-14T18:43:41Z
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