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L’ESSENTIEL 1

1èreS

Chap 6.1. Structures des molécules
organiques
et
couleurs.

P. Bellanca-Penel, Lycée Ampère, Lyon

P...
Structure des
molécules

Caractère
coloré
Structure des
molécules

Caractère
coloré
Structure des
molécules

Caractère
coloré

Lycopène
Structure des
molécules

Caractère
coloré

Lycopène
Structure des
molécules

Caractère
coloré
Structure des
molécules

?

Caractère
coloré
Ethylène
Ethylène
λ

abs
pic

= 172nm

incolore
Ethylène
λ

abs
pic

= 172nm

1,3 butadiène
Ethylène

1,3 butadiène

λ

λ

abs
pic

= 172nm

abs
pic

= 218nm

incolore
Ethylène

1,3 butadiène

λ

λ

abs
pic

= 172nm

abs
pic

= 218nm

hexatriène
Ethylène

1,3 butadiène

λ

λ

abs
pic

= 172nm

abs
pic

= 218nm

hexatriène
λ

abs
pic

= 258nm

incolore
Ethylène

1,3 butadiène

λ

λ

abs
pic

= 172nm

abs
pic

= 218nm

hexatriène
λ

abs
pic

= 258nm
Ethylène

1,3 butadiène

λ

abs
pic

= 172nm

λ

abs
pic

= 218nm

λ

abs
pic

= 455nm

hexatriène
λ

abs
pic

= 258nm

CO...
béta carotène
Doubles liaisons
conjuguées
Doubles liaisons
conjuguées
2 doubles liaisons
conjuguées
Doubles liaisons
conjuguées
2 doubles liaisons
conjuguées

3 doubles liaisons
conjuguées
Doubles liaisons
conjuguées
2 doubles liaisons
conjuguées

3 doubles liaisons
conjuguées

Deux doubles liaisons sont conju...
Doubles liaisons
conjuguées

Combien de doubles liaisons conjuguées ?
Doubles liaisons
conjuguées

11
doubles liaisons conjuguées dans la molécule de
carotène
Doubles liaisons
conjuguées

tion
tten
A

C
C

C

C

C

O

N

N
Doubles liaisons
conjuguées

tion
tten
A

C
C

C

O

N

C

C
N
O
H

Cinnamaldehyde
Doubles liaisons
conjuguées

tion
tten
A

C
C

C

O

N

C

C
N
O
H

Cinnamaldehyde

Combien de
doubles
liaisons
conjuguées...
Doubles liaisons
conjuguées

tion
tten
A

C
C

C

O

N

C

C
N
O
H

Cinnamaldehyde

5
Groupes
chromophores

Un groupe chromophore est la partie d’une molécule
qui absorbe certains rayonnements lumineux, donna...
Groupes
chromophores

groupe chromophore du béta carotène.
Indicateurs colorés
Indicateurs colorés
«un indicateur coloré est un acide
ou une base organique dont la
structure interne change lorsque
le p...
Indicateurs colorés
«un indicateur coloré est un acide
ou une base organique dont la
structure interne change lorsque
le p...
Indicateurs colorés

1877

Phénolphtaléine
en milieu acide
Indicateurs colorés

Phénolphtaléine
en milieu acide
INCOLORE
Indicateurs colorés

Phénolphtaléine
en milieu acide
INCOLORE
Indicateurs colorés

Phénolphtaléine
en milieu acide
INCOLORE

Phénolphtaléine
en milieu basique
Indicateurs colorés

Phénolphtaléine
en milieu acide
INCOLORE

Phénolphtaléine
en milieu basique
ROSE FUCHSIA
Indicateurs colorés

Phénolphtaléine
en milieu acide
INCOLORE

Phénolphtaléine
en milieu basique
ROSE FUCHSIA
A très bientôt
sur

PHYKHÊMIA
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C.6.1. structure des molécules et couleur

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C.6.1. structure des molécules et couleur

  1. 1. L’ESSENTIEL 1 1èreS Chap 6.1. Structures des molécules organiques et couleurs. P. Bellanca-Penel, Lycée Ampère, Lyon PHYKÊMIA
  2. 2. Structure des molécules Caractère coloré
  3. 3. Structure des molécules Caractère coloré
  4. 4. Structure des molécules Caractère coloré Lycopène
  5. 5. Structure des molécules Caractère coloré Lycopène
  6. 6. Structure des molécules Caractère coloré
  7. 7. Structure des molécules ? Caractère coloré
  8. 8. Ethylène
  9. 9. Ethylène λ abs pic = 172nm incolore
  10. 10. Ethylène λ abs pic = 172nm 1,3 butadiène
  11. 11. Ethylène 1,3 butadiène λ λ abs pic = 172nm abs pic = 218nm incolore
  12. 12. Ethylène 1,3 butadiène λ λ abs pic = 172nm abs pic = 218nm hexatriène
  13. 13. Ethylène 1,3 butadiène λ λ abs pic = 172nm abs pic = 218nm hexatriène λ abs pic = 258nm incolore
  14. 14. Ethylène 1,3 butadiène λ λ abs pic = 172nm abs pic = 218nm hexatriène λ abs pic = 258nm
  15. 15. Ethylène 1,3 butadiène λ abs pic = 172nm λ abs pic = 218nm λ abs pic = 455nm hexatriène λ abs pic = 258nm COLORÉE !
  16. 16. béta carotène
  17. 17. Doubles liaisons conjuguées
  18. 18. Doubles liaisons conjuguées 2 doubles liaisons conjuguées
  19. 19. Doubles liaisons conjuguées 2 doubles liaisons conjuguées 3 doubles liaisons conjuguées
  20. 20. Doubles liaisons conjuguées 2 doubles liaisons conjuguées 3 doubles liaisons conjuguées Deux doubles liaisons sont conjuguées si elles alternent avec une liaison simple.
  21. 21. Doubles liaisons conjuguées Combien de doubles liaisons conjuguées ?
  22. 22. Doubles liaisons conjuguées 11 doubles liaisons conjuguées dans la molécule de carotène
  23. 23. Doubles liaisons conjuguées tion tten A C C C C C O N N
  24. 24. Doubles liaisons conjuguées tion tten A C C C O N C C N O H Cinnamaldehyde
  25. 25. Doubles liaisons conjuguées tion tten A C C C O N C C N O H Cinnamaldehyde Combien de doubles liaisons conjuguées ?
  26. 26. Doubles liaisons conjuguées tion tten A C C C O N C C N O H Cinnamaldehyde 5
  27. 27. Groupes chromophores Un groupe chromophore est la partie d’une molécule qui absorbe certains rayonnements lumineux, donnant éventuellement au corps pur associé son caractère coloré.
  28. 28. Groupes chromophores groupe chromophore du béta carotène.
  29. 29. Indicateurs colorés
  30. 30. Indicateurs colorés «un indicateur coloré est un acide ou une base organique dont la structure interne change lorsque le pH évolue ce qui entraîne une variation de couleur.»
  31. 31. Indicateurs colorés «un indicateur coloré est un acide ou une base organique dont la structure interne change lorsque le pH évolue ce qui entraîne une variation de couleur.» Forme basique Forme acide
  32. 32. Indicateurs colorés 1877 Phénolphtaléine en milieu acide
  33. 33. Indicateurs colorés Phénolphtaléine en milieu acide INCOLORE
  34. 34. Indicateurs colorés Phénolphtaléine en milieu acide INCOLORE
  35. 35. Indicateurs colorés Phénolphtaléine en milieu acide INCOLORE Phénolphtaléine en milieu basique
  36. 36. Indicateurs colorés Phénolphtaléine en milieu acide INCOLORE Phénolphtaléine en milieu basique ROSE FUCHSIA
  37. 37. Indicateurs colorés Phénolphtaléine en milieu acide INCOLORE Phénolphtaléine en milieu basique ROSE FUCHSIA
  38. 38. A très bientôt sur PHYKHÊMIA

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