Reel Notes - Reel Pigments and Colors Pigments coloring material used to make paint Pigments work by selectively absorbing a portion of visible

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Reel   Pigments and Colors Pigments: coloring material used to make paint Pigments work by selectively absorbing a portion of visible spectrum, while remaining  light is reflected. Causes of Color 1.) Emitted light, black body radiation, incandescence  2.) Steering and/or interference effects Scattering, disperse, refraction 3.) Absorbed Light Intra-atomic excitations Molecular orbital Excitations Bond to bond transitions Inter-atomic excitations If absorbance occurs in one region of color wheel, material appears with opposite (complimentary)  color If absorbance occurs in multiple regions of color wheel, the material generally takes on a color in  the middle of the colors not absorbed *** 1 electron volt = 1.6022E-19 J Chemists are able to measure the wavelength of light a material absorbs by UV-vis spectroscopy The UV-Vis spectrometer will measure the lambda of radiation absorbed and by measuring which  of these wavelengths are absorbed, and which are not absorbed, we can learn a great deal about  electronic structure Coordination Compounds Color of compound provides insight to structure and bonding of matter If a chemist can manipulate the structure and bonding, he or she can control color A coordination compound typically consists of a complex ion, (TM w/ ligands) and it 
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This note was uploaded on 09/15/2008 for the course CHEM 123 taught by Professor Larosa during the Spring '06 term at Ohio State.

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Reel Notes - Reel Pigments and Colors Pigments coloring material used to make paint Pigments work by selectively absorbing a portion of visible

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