I was wondering if anyone knows where I can find UV-VIS spectra of the n-decanes. Specifically tetradecane and dodecane. I can't seem to find such information using my regular search methods, so I was wondering if there was a common database that contains such things that I am simply unaware of (likely).

All I really need to know is if these chemicals will absorb radiation with wavelengths between 355-375 nm. A source to back this up will only help.

Thanks, Sam

  • $\begingroup$ They are colourless liquids .... $\endgroup$
    – Karl
    Feb 8, 2020 at 20:50

1 Answer 1


To the best of my knowledge, ordinary alkanes do not typically absorb anywhere in the UV/Vis region. The organic molecules that do typically contain electrons in $\pi$- or non-bonding orbitals, which have energy level transitions corresponding to UV/Vis wavelengths. That said, I did find one paper1 describing absorptions around the far UV ambit, where $\lambda < 200\mathrm{nm}$.

  1. DOI: 10.1021/jp903435c
  • $\begingroup$ Thank you for this information. In addition to the paper you cited there, I found a book - "Spectrometric identification of organic compounds" - that confirms this information. $\endgroup$
    – pballjew
    Aug 11, 2014 at 17:36

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