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. Author manuscript; available in PMC: 2012 Sep 5.
Published in final edited form as: Inorg Chem. 2011 Aug 5;50(17):7966–7979. doi: 10.1021/ic2012843

Table 2.

Stability Constants of the Intermediate Chelates H2LnL+ for a Variety of DOTA-Type Ligands (I = 1.0 M KCl, 25 °C)

log KH2LnL+
EuDOTA 4.32;a 4.40;b 5.88;c 8.26d
GdDOTA 9.32e
TbDOTA 8.96f
GdNB-DOTA 5.43 (0.03)
GdS-SSS-1 6.06 (0.03)
GdS-RRRR-NB-DOTMA 4.70 (0.02)
a

I = 1.0 M NaCl, determined by potentiometric titration under nonequilibrium conditions, taken from ref 30.

b

I = 1.0 M NaCl, determined by UV–vis spectrophotometry, taken from ref 30.

c

I = 0.1 M KCl, determined by luminescence, taken from ref 32.

d

I = 0.1 M Me4NCl, determined by potentiometric titration under nonequilibrium conditions, taken from ref 31.

e

I = 0.1 M Me4NCl, determined by potentiometric titration, taken from ref 31.

f

I = 0.1 M Me4NCl, determined by potentiometric titration, taken from ref 31.