UV Spectroscopy - UV Spectroscopy E = h where h is Plancks...

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1 UV Spectroscopy E = h ν where h is Planck’s constant ν is the frequency A = ε bc A is the absorbance ε is the extinction coefficient b is the path length c is the concentration UV Spectrum of butadiene Π -orbitals of butadiene
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2 Other pi orbitals uv transitions for carbonyl containing molecules __ __ __ __ __ antibonding sigma antibonding pi nonbonding (n) bonding pi bonding sigma O
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3 Typical uv transitions • Acetone: π−π∗ ~ 1 50 nm n- σ * 1 88 nm n- π∗ 279 nm • Benzene: π−π∗ ~ 1 80 nm π−π∗ ~200 nm π−π∗
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