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. Author manuscript; available in PMC: 2015 Jan 29.
Published in final edited form as: J Am Chem Soc. 2014 Jan 14;136(4):1545–1558. doi: 10.1021/ja411376u

Figure 2.

Figure 2

UV-vis spectroscopic changes upon titration of 0.2 mM 2 (green line) with Me4Im to generate 6 in 3:1 CH2Cl2-MeCN at −85 °C (red line). Inset: plot showing the absorbance at 705 nm vs concentration of added Me4Im. The pKa of 2 is estimated to be 0.3 units higher than that of the conjugate acid of Me4Im.