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. Author manuscript; available in PMC: 2011 Oct 1.
Published in final edited form as: Chem Soc Rev. 2010 Aug 24;39(10):3784–3809. doi: 10.1039/c002694h

Table 7.

Association constants, Ka (M−1), in DMSO at 295 Ka

Ka for Cl−b
 Ka for Na +c
 Ka for K +c
43 43 + Na+ 43 + K+ 43 43 + Cl− 43 43 + Cl−
35 50 460 5 25 8 340
a

Association constants are the average of all receptor protons which exhibit significant complexation-induced shifts. The initial [43]=10 mM; uncertainty ±15%.

b

43/Cl− association constant in the presence of 1 molar equiv. of metal tetraphenylborate.

c

43/M+ association constant in the presence of 1 molar equiv. of tetrabutylammonium chloride.