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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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