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. Author manuscript; available in PMC: 2017 Aug 4.
Published in final edited form as: Org Lett. 2008 May 14;10(12):2429–2432. doi: 10.1021/ol8006925

Table 1.

Thermodynamic and Photophysical Properties of 1 and 3 in MeOH/H2O (2:1 v/v) at 298 K.

Compound 1 3
pKa1, pKa2       10.1±0.1, 12.0±0.1       10.6±0.1, 11.2±0.3
Species H2A HA− A2− H2A HA– A2−
Absorption (nm) 362 388 393 355 359 363
Emission (nm) 428 575 533 412 quenched
Φ fl 0.34 n/d 0.26 0.46 < 0.001
τ(ns) 0.91 n/d 1.0 1.41