Chapter 14-15 August 26

Chapter 14-15 August 26 - Light Absorbed: 9 Chapter 15:...

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1 Diene Polymerization: (Review 7.10) Example:
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2 UV Spectroscopy: UV­Vis Spectroscopy provides information about compounds with conjugated double bonds Conjugated compounds absorb light in the ultraviolet region Electrons in the HOMO orbital undergo a transition to the LUMO orbital due to this absorption
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3 This absorption takes place at a specific/distinct wavelength for each different compound. It is called a π to π * transition
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4 UV­Vis spectrum: Beer­Lambert Law: Plot of absorbance against wavelength
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5 As conjugation increases, the energy gap between HOMO and LUMO decreases More conjugation = smaller energy gap = longer wavelength If the extent of conjugation keeps increasing, the corresponding wavelength of radiation absorbed increases until it enters the visible spectrum.
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8 Dependence of the Color Observed on the Wavelength of
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Unformatted text preview: Light Absorbed: 9 Chapter 15: Benzene and Aromaticity Aromatic Compounds: Examples: Unsaturated cyclic systems that undergo substitution rather than addition 10 I. Nomenclature: IUPAC System Monosubstituted benzenes: Examples: If the alkyl substituent is the same size or smaller than the ring (six or fewer carbons), the compound is named as an alkyl substituted benzene If the alkyl substituent is larger than the ring (more than six carbons), the compound is named as a phenyl substituted alkane 11 Different ways to indicate benzene and benzene containing groups as substituents: Phenyl group: Benzyl group: Examples: Different ways to write/draw benzene and benzene containing groups: ,...
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Chapter 14-15 August 26 - Light Absorbed: 9 Chapter 15:...

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