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. Author manuscript; available in PMC: 2014 Apr 10.
Published in final edited form as: J Am Chem Soc. 2013 Apr 5;135(15):5904–5910. doi: 10.1021/ja401572r

Table 1.

The pKa Values of the p1TAM-D Probe and EPR Spectral Parameters of Its Different Ionization States

state pKa aP (mG) ΔHpp (mG)
p1TAM4- 6.9 ± 0.05 3370 ± 5 33 ± 2b; 48 ± 2c
p1TAM3- ≈2.6 ± 0.3a 3630 ± 5 37 ± 2b; 52 ± 2c
p1TAM1- ≈1.3 ± 0.2 ≈3610 ≈40
p1TAM0 ≈3750 ≈40
a

The pKa value of carboxyl groups.

b

Measured by X-band EPR.

c

Measured by L-band EPR.