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Espectro de luz visible Absorción de luz-estructura molecular.

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Presentation on theme: "Espectro de luz visible Absorción de luz-estructura molecular."— Presentation transcript:

1 Espectro de luz visible Absorción de luz-estructura molecular

2 Luz incidente: I 0 Luz absorbida: Ia Absorbancia: A = -log T = .b.c  : Coeficiente de absorción molar ; [  ] = M -1 cm -1

3 Rango Espectral / nm [1nm = m] E/ kJm -1 Rayos  ,2x10 8 Rayos X – 30 1,2 x 10 6 – 3984,8 Ultravioleta (Uv) 200 – ,7 – 341,5 Visible 400 – ,9 – 170,9 Infra-rojo (IR) 1000 – ,5 – 12,0 Micro-ondas 10 7 – ,2 x – 1,2 x Ondas de Radio ,2 x E = N hc/  = 1,197 x /  [kJ mol -1 ] Energía de unión más representativas (kJ/mol) H-H C-H C-C C-N C-O O-H N-N

4 max = 211 nm max = 278 nm

5 max = 255 nm max = 271 nm

6 may = 525 nm  max = 544 nm max = 646 nm

7  max = 396 nm max = 408 nm

8  max = 698 nm max = 674 nm  max = 784 nm

9 Diagrama de Jablonsky

10 hh

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12 Clorofila a Clorofila b  caroteno

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14  X UV Vis IR  ondas radio UVC UVB UVA nm Filtro UVB Ozono Filtro UVB + UVA

15 Eumelanina Feomelanina

16 Fórmulas químicas BF3 OT BMBM MBC OMC

17 FILTROS SOLARES OT = octiltriazona BMBM = butilmetoxidibenzoilmetano OMC = octilmetoxicinamato MBC = metilbencilidencanfor BF3 = benzofenona 3

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