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similarity of arts andculture between tamil nadu and jammu and kashmir

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s Home Bookshelves General Chemistry Map: General Chemistry (Petrucci et al.) 24: Complex Ions and Coordination Compounds Expand/collapse global location

24.7: Color and the Colors of Complexes

Last updatedAug 25, 2020

24.6: Magnetic Properties of Coordination Compounds and Crystal Field Theory

24.8: Aspects of Complex-Ion Equilibria

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The human eye perceives a mixture of all the colors, in the proportions present in sunlight, as white light. Complementary colors, those located across from each other on a color wheel, are also used in color vision. The eye perceives a mixture of two complementary colors, in the proper proportions, as white light. Likewise, when a color is missing from white light, the eye sees its complement. For example, when red photons are absorbed from white light, the eyes see the color green. When violet photons are removed from white light, the eyes see lemon yellow (Figure 24.7.1 ).

Figure 24.7.1 : (a) An object is black if it absorbs all colors of light. If it reflects all colors of light, it is white. An object has a color if it absorbs all colors except one, such as this yellow strip. The strip also appears yellow if it absorbs the complementary color from white light (in this case, indigo). (b) Complementary colors are located directly across from one another on the color wheel.

The blue color of the [Cu(NH3)4]2+ ion results because this ion absorbs orange and red light, leaving the complementary colors of blue and green (Figure 24.7.2 ). If white light (ordinary sunlight, for example) passes through [Cu(NH3)4]SO4 solution, some wavelengths in the light are absorbed by the solution. The [Cu(NH3)4]2+ ions in solution absorb light in the red region of the spectrum. The light which passes through the solution and out the other side will have all the colors in it except for the red. We see this mixture of wavelengths as pale blue (cyan). The diagram gives an impression of what happens if you pass white light through a [Cu(NH3)4]SO4 solution.

Figure 24.7.2 : A solution of [Cu(NH3)4]2+ ions absorbs red and orange light, so the transmitted light appears as the complementary color, blue.