The π→π* transition of conjugated double bonds is above ≈200 nm with typical intensities of the order of log ε ≈ 4. Its position can be estimated with the Woodward–Fieser rule. For cross-conjugated systems, the value for the chromophore absorbing at the longest wavelength has to be calculated.
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© 2009 Springer-Verlag Berlin Heidelberg
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Pretsch, E., Bühlmann, P., Badertscher, M. (2009). UV/Vis Spectroscopy. In: Structure Determination of Organic Compounds. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-93810-1_9
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DOI: https://doi.org/10.1007/978-3-540-93810-1_9
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