lanalyse spectrale. spectres dabsorption uv-visible solution de permanganate de potassium : kmno 4
TRANSCRIPT
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L’analyse spectrale
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Spectres d’absorption UV-visible
Solution de permanganate de potassium : KMnO4
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Absorption et couleur complémentaire
580-590 nm
380-420 nm
435-480 nm
510-560 nm
625-750 nm
595-625 nm
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Absorption et couleur complémentaire
anthracène (jaune)λmax = 380 nm
benzène (incolore)λmax = 254 nm
naphtalène (incolore)λmax = 314 nm
naphtacène (orange)λmax = 480 nm
pentacène (violet)λmax = 580 nm
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Modes de vibration d’une molécule
molécule au repos
mouvement d’élongation(stretch)
mouvement de déformation
(bend)
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Table simplifiée de spectroscopie IR
Absorptions caractéristiques de quelques liaisons en spectroscopie infrarouge
Liaison Nombre d’onde σ (cm-1)
C–H 2 800 – 3 100
C–C 600 – 1 400
C=C 1 500 – 1 700
CC 2 200
C–O 1 000 – 1 300
C=O 1 700 – 1 750
O–H libre 3 600 (assez fine)
O–H lié 3 300 (large)
O–H acide carboxylique 2 500 – 3 200 (assez large)
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Spectres IR
butanone
Pentan-2-ol
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Spectres IR : cas du groupe alcool
Hexan-1-ol pur
Hexan-1-ol solution diluée
Hexan-1-ol solution très diluée
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Quelques déplacements chimiques en RMN du proton
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Spectres RMN du proton
Chloroforme CHCl3
TMS
08 6 4 2
1-chloro-2,2-diméthylpropane
CHCl1-CH2Cl
Bromoéthane BrCH2-CH3
h1
h2
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C4H80
Spectres RMN du proton