Skip to main content
. Author manuscript; available in PMC: 2020 May 22.
Published in final edited form as: J Org Chem. 2012 Nov 20;77(23):10804–10810. doi: 10.1021/jo3020837

Table 1.

UV absorbances of the un-ionized and the monoanionic forms of 13 at 241 and 278 nm.

graphic file with name nihms-421658-t0002.jpg
Entry pH λ241 (AU) λ278 (AU)
1. 7.40 0.94
(ε = 11.0 mM−1 cm−1)		 0
2. 11.00 0.88 0.35
3. 11.20 0.72 0.36
4. 11.40 0.52 0.39
5. 11.60 0.48 0.41
6. 11.70 (pKa) 0.47 0.42
7. 11.75 0.42 0.44
8. 11.80 0.29 0.51
9. 11.90 0.23 0.68
10. 12.00 0.17 0.80
11. 14.00 0 0.85
(ε = 10.0 mM−1 cm−1)