Chromophoric

A chromophoric indicates a Molécule coloured. More precisely, this term indicates the grouping of Atome S within this molecule which is responsible for its color. This optical property results from a capacity with to absorb the energy of Photons in a range of the visible spectrum while the others wavelengths are transmitted or diffused. For example, the Carotène is the chromophoric one which gives their color to many fruits (like the Carotte S), this molecule indeed absorbs the wavelengths in the blue range of the visible spectrum but reflects the complementary color (orange and red). A product containing of carotene thus appears orange to us or red.

The two principal types of chromophoric are:

  • systems with combined connections pi : The presence of a sufficiently long sequence of double connections combined in an organic molecule creates a electronic Nuage delocalized which can enter in Résonance with the incidental radiation. Examples: β-carotene, Anthocyanine, Rétinol
  • metal complex around a Metal of transition: The orbital D of the metal atom are distributed between this one and the ligand. The absoprtion of an incidental photon results in a jump of an electron into orbital the higher. One as well finds this type of chromophoric in biological molecules (Chlorophylle, Hémoglobine, Hémocyanine) as in inorganic materials (Améthyste, Malachite).

In the living organisms, the chromophoric ones can be used with detection of the light (photoreceiver) or for the luminous energy absorption (Photosynthèse).

Examples of chromophoric:

See too

Category: Dye

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