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. Author manuscript; available in PMC: 2017 Jul 1.
Published in final edited form as: J Org Chem. 2016 May 17;81(11):4530–4539. doi: 10.1021/acs.joc.6b00310

Figure 4.

Figure 4

(a, b) Assessing the effect of solvent polarity on absorption of 5 in MeOH–dioxane mixtures: correlation of absorption energy maxima in kcal/mol (a) and absorption intensity (at the absorption maxima) (b) with ET(30) values illustrate that as polarity increases 5 exhibits a hypsochromic shift (R = 0.88) along with a hypochromic effect (R = 0.97). (c, d) Assessing the effect of solvent polarity on absorption of 8: correlation of (c) absorption wavelength maxima with ET(30) values for MeOH–dioxane solutions (circle) and water (square) and (d) absorption intensity (at the wavelength maxima) with ET(30) values suggests a polarity dependent transition.