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. 2016 Sep 9;6:32949. doi: 10.1038/srep32949

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Copyright © 2016, The Author(s)

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Comparison of calculated and experimental IR spectra: calculated IR spectra of (a) 3-indole-acetic-acid and (b) 3-indole-acetic-acid radical cation; observed IR spectra of (c) 3-indole-acetic-acid in solution, (d) 3-indole-acetic-acid solution irradiated by mercury lamp, and 3-indole-acetic-acid solution irradiated by mercury lamp in the presence of (e) Na⁺-montmorillonite, (f) HDTMA-montmorillonite; observed IR spectra of (g) Na⁺-montmorillonite, (h) HDTMA-montmorillonite irradiated by mercury lamp. Experimental conditions: the initial concentrations of 3-indole-acetic-acid, and clay mineral were 10 mM and 5 g L⁻¹, respectively; pH was adjusted to 4.0 by adding NaOH and HCl; an arc light source equipped with a 350 W mercury lamp was used as the light source.