Gallic acid
Spectral data
Spectral data
-------------

| [UV\-Vis](/wiki/UV/VIS_spectroscopy "UV/VIS spectroscopy") | |
| --- | --- |
| [Lambda\-max](/wiki/Lambda-max "Lambda-max"): | 220, 271 [nm](/wiki/Nanometre "Nanometre") (ethanol)[thumb\|left\|Spectrum of gallic acid](/wiki/File:Gallic_acid_spectrum.PNG "Gallic acid spectrum.PNG") |
| [Extinction coefficient](/wiki/Molar_absorptivity "Molar absorptivity") (log ε) |  |
| [IR](/wiki/Infrared "Infrared") | |
| Major absorption bands | ν : 3491, 3377, 1703, 1617, 1539, 1453, 1254 cm−1 (KBr) |
| [NMR](/wiki/NMR_Spectroscopy "NMR Spectroscopy") | |
| [Proton NMR](/wiki/Proton_NMR "Proton NMR") (acetone\-d6\):  d : doublet, dd : doublet of doublets, m : multiplet, s : singlet | [δ](/wiki/Chemical_shift "Chemical shift") : 7\.15 (2H, s, H\-3 and H\-7\) |
| [Carbon\-13 NMR](/wiki/Carbon-13_NMR "Carbon-13 NMR") (acetone\-d6\): | [δ](/wiki/Chemical_shift "Chemical shift") : 167\.39 (C\-1\), 144\.94 (C\-4 and C\-6\), 137\.77 (C\-5\), 120\.81 (C\-2\), 109\.14 (C\-3 and C\-7\) |
| Other NMR data |
| [MS](/wiki/Mass_Spectrometry "Mass Spectrometry") | |
| Masses of main fragments | ESI\-MS \[M\-H]\- m/z : 169\.0137 ms/ms (iontrap)@35 CE m/z product 125(100\), 81(\<1\) |
|


How does the UV-Vis spectrum relate to the chemical structure of gallic acid?