If you take an IR spectra of dibenzalacetone, you will notice a C=0 peak ~1639 cm-. Why is the C=O peak showing up at lower frequency wavenumber than standard C=0 frequency (1715 cm-)?

Macroscale and Microscale Organic Experiments
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ISBN:9781305577190
Author:Kenneth L. Williamson, Katherine M. Masters
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Chapter56: The Synthesis Of 2,2-dimethyl-1,5-dioxolane; The Acetonide Derivative Of A Vicinal Diol
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1. If you take an IR spectra of dibenzalacetone, you will notice a C=O peak ~1639 cm-.
Why is the C=O peak showing up at lower frequency wavenumber than standard
C=O frequency (1715 cm:)?
Transcribed Image Text:1. If you take an IR spectra of dibenzalacetone, you will notice a C=O peak ~1639 cm-. Why is the C=O peak showing up at lower frequency wavenumber than standard C=O frequency (1715 cm:)?
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