lect5_2007_ct_pigments

lect5_2007_ct_pigments - 1 Energy Energy Metal(Cr...

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Unformatted text preview: 1 Energy Energy Metal (Cr) d-orbitals 12 Oxygen 2p orbitals (4 oxygens x 3 p orbitals) Nonbonding Oxygen 2p MO’s CT t 2 orbitals (antibonding) e orbitals (antibonding) [CrO [CrO 4 ] 2- t 2 orbitals (bonding) e orbitals (bonding) CT ~ 3.3 CT ~ 3.3 eV eV (~375 nm) (~375 nm) Absorption = Violet Absorption = Violet Color = Yellow Color = Yellow PbCrO 4 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 250 300 350 400 450 500 550 600 650 700 750 wavelength (nm) absorbance Absorption Spectra CrO Absorption Spectra CrO 4 2- Solutions Solutions CT 1 375 nm light 2 Absorption Spectra CrO Absorption Spectra CrO 4 2- Solutions Solutions CT 2 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 250 300 350 400 450 500 550 600 650 700 750 wavelength (nm) absorbance 270 nm light 0.0 0.2 0.4 0.6 0.8 1.0 1.2 250 300 350 400 450 500 550 600 650 700 wavelength (nm) absorbance (CrO 4 2- ) 1 2 3 4 5 absorbance (SrCrO 4 , PbCrO 4 ) dilute CrO 4 2- solution SrCrO 4 PbCrO 4 conc. CrO 4 2- solution What about Chromate Salts?...
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This note was uploaded on 06/03/2011 for the course CHM 123 taught by Professor Woodward during the Spring '08 term at Ohio State.

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lect5_2007_ct_pigments - 1 Energy Energy Metal(Cr...

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