Effect of ph on uv absorbance of benzoic acid

  • Thread starter jethro
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i was recently reading about uv absorbance, and i understand why species such as the phenoxide ion and aniline absorb uv radiation at longer radiation and with more efficiency than their protonated counterparts.
i have spent long hours, however, trying to figure out why a benzoate ion might absorb at a shorter wavelength, and with less efficiency, than benzoic acid.
i have attached the source which suggests that this is true; there is a graph on page 5. my last resort is to say that the source is wrong but i want to make sure... can anyone help?
 

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  • Revision lecture UV-vis 2009-2010.pdf
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  • #2
chemisttree
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How might dimers of benzoic acid be different at high pH vs. low pH?

http://pubs.acs.org/doi/abs/10.1021/ja00503a016" [Broken]
 
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  • #3
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of course!!

...much appreciated, thank you.
 

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